added different ADC sampling examples for the LisaM v2 including:
* simple polling of an injected channel * timer triggered sampling of an injected channel * timer triggered sampling and IRQ handling of an injected channel * timer triggered sampling and IRQ handling of 4 injected channels
This commit is contained in:
Stephen Dwyer
parent
9e77f8c361
commit
bece4c30d3
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@ -0,0 +1,27 @@
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = adc
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# Comment the following line if you _don't_ have luftboot flashed!
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LDFLAGS += -Wl,-Ttext=0x8002000
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CFLAGS += -std=c99
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LDSCRIPT = ../lisa-m.ld
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include ../../Makefile.include
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@ -0,0 +1,11 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This is a simple polling example that sends the value read out from the
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temperature sensor ADC channel of the STM32 to the USART2.
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This example polls injected channels.
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The terminal settings for the receiving device/PC are 115200 8n1.
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@ -0,0 +1,174 @@
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2012 Stephen Dwyer <dwyer.sc@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/flash.h>
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#include <libopencm3/stm32/f1/gpio.h>
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#include <libopencm3/stm32/f1/adc.h>
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#include <libopencm3/stm32/usart.h>
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void usart_setup(void)
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{
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/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART2, 115200);
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usart_set_databits(USART2, 8);
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usart_set_stopbits(USART2, USART_STOPBITS_1);
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usart_set_mode(USART2, USART_MODE_TX_RX);
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usart_set_parity(USART2, USART_PARITY_NONE);
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usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART2);
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}
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void gpio_setup(void)
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{
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/* Enable GPIO clocks. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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/* Setup the LEDs. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
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}
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void adc_setup(void)
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{
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int i;
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
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/* Make sure the ADC doesn't run during config. */
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adc_off(ADC1);
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/* We configure everything for one single injected conversion. */
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adc_disable_scan_mode(ADC1);
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adc_set_single_conversion_mode(ADC1);
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/* We can only use discontinuous mode on either the regular OR injected channels, not both */
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adc_disable_discontinous_mode_regular(ADC1);
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adc_enable_discontinous_mode_injected(ADC1);
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/* We want to start the injected conversion in software */
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adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_JSWSTART);
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adc_set_right_aligned(ADC1);
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/* We want to read the temperature sensor, so we have to enable it. */
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adc_enable_temperature_sensor(ADC1);
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adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
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adc_on(ADC1);
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/* Wait for ADC starting up. */
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for (i = 0; i < 800000; i++) /* Wait a bit. */
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__asm__("nop");
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adc_reset_calibration(ADC1);
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while ((ADC_CR2(ADC1) & ADC_CR2_RSTCAL) != 0); //added this check
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adc_calibration(ADC1);
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while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0); //added this check
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}
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void my_usart_print_int(u32 usart, int value)
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{
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s8 i;
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u8 nr_digits = 0;
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char buffer[25];
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if (value < 0) {
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usart_send_blocking(usart, '-');
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value = value * -1;
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}
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while (value > 0) {
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buffer[nr_digits++] = "0123456789"[value % 10];
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value /= 10;
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}
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for (i = (nr_digits - 1); i >= 0; i--) {
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usart_send_blocking(usart, buffer[i]);
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}
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usart_send_blocking(usart, '\r');
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}
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int main(void)
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{
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u8 channel_array[16];
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u16 temperature = 0;
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rcc_clock_setup_in_hse_12mhz_out_72mhz();
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gpio_setup();
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usart_setup();
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adc_setup();
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gpio_set(GPIOA, GPIO8); /* LED1 on */
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gpio_set(GPIOC, GPIO15); /* LED2 on */
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/* Send a message on USART1. */
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usart_send_blocking(USART2, 's');
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usart_send_blocking(USART2, 't');
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usart_send_blocking(USART2, 'm');
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usart_send_blocking(USART2, '\r');
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usart_send_blocking(USART2, '\n');
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/* Select the channel we want to convert. 16=temperature_sensor. */
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channel_array[0] = 16;
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/* Set the injected sequence here, with number of channels */
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adc_set_injected_sequence(ADC1, 1, channel_array);
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/* Continously convert and poll the temperature ADC. */
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while (1) {
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/*
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* If the ADC_CR2_ON bit is already set -> setting it another time
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* starts a regular conversion. Injected conversion is started
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* explicitly with the JSWSTART bit as an external trigger. It may
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* also work by setting no regular channels and setting JAUTO to
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* automatically convert the injected channels after the regular
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* channels (of which there would be none). (Not tested.)
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*/
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adc_start_conversion_injected(ADC1);
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/* Wait for end of conversion. */
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while (!(ADC_SR(ADC1) & ADC_SR_JEOC));
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ADC_SR(ADC2) &= ~ADC_SR_JEOC; //clear injected end of conversion
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temperature = ADC_JDR1(ADC1); //get the result from ADC_JDR1 on ADC1 (only bottom 16bits)
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/*
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* That's actually not the real temperature - you have to compute it
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* as described in the datasheet.
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*/
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my_usart_print_int(USART2, temperature);
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gpio_toggle(GPIOA, GPIO8); /* LED2 on */
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}
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return 0;
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}
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@ -0,0 +1,27 @@
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = adc
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# Comment the following line if you _don't_ have luftboot flashed!
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LDFLAGS += -Wl,-Ttext=0x8002000
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CFLAGS += -std=c99
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LDSCRIPT = ../lisa-m.ld
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include ../../Makefile.include
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@ -0,0 +1,11 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This is a simple example that sends the value read out from the
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temperature sensor ADC channel of the STM32 to the USART2.
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This example uses a timer trigger to automatically sample the adc channel.
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The terminal settings for the receiving device/PC are 115200 8n1.
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@ -0,0 +1,195 @@
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2012 Stephen Dwyer <dwyer.sc@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/flash.h>
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#include <libopencm3/stm32/f1/gpio.h>
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#include <libopencm3/stm32/f1/adc.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/timer.h>
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void usart_setup(void)
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{
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/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART2, 115200);
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usart_set_databits(USART2, 8);
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usart_set_stopbits(USART2, USART_STOPBITS_1);
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usart_set_mode(USART2, USART_MODE_TX_RX);
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usart_set_parity(USART2, USART_PARITY_NONE);
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usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART2);
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}
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void gpio_setup(void)
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{
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/* Enable GPIO clocks. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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/* Setup the LEDs. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
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}
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void timer_setup(void)
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{
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/* Set up the timer TIM2 for injected sampling */
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uint32_t timer;
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volatile uint32_t *rcc_apbenr;
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uint32_t rcc_apb;
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timer = TIM2;
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rcc_apbenr = &RCC_APB1ENR;
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rcc_apb = RCC_APB1ENR_TIM2EN;
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rcc_peripheral_enable_clock(rcc_apbenr, rcc_apb);
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/* Time Base configuration */
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timer_reset(timer);
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timer_set_mode(timer, TIM_CR1_CKD_CK_INT,
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TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
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timer_set_period(timer, 0xFF);
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timer_set_prescaler(timer, 0x8);
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timer_set_clock_division(timer, 0x0);
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/* Generate TRGO on every update. */
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timer_set_master_mode(timer, TIM_CR2_MMS_UPDATE);
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timer_enable_counter(timer);
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}
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void adc_setup(void)
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{
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int i;
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
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/* Make sure the ADC doesn't run during config. */
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adc_off(ADC1);
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/* We configure everything for one single timer triggered injected conversion. */
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adc_disable_scan_mode(ADC1);
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adc_set_single_conversion_mode(ADC1);
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/* We can only use discontinuous mode on either the regular OR injected channels, not both */
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adc_disable_discontinous_mode_regular(ADC1);
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adc_enable_discontinous_mode_injected(ADC1);
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/* We want to start the injected conversion with the TIM2 TRGO */
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adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_TIM2_TRGO);
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adc_set_right_aligned(ADC1);
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/* We want to read the temperature sensor, so we have to enable it. */
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adc_enable_temperature_sensor(ADC1);
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adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
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adc_on(ADC1);
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/* Wait for ADC starting up. */
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for (i = 0; i < 800000; i++) /* Wait a bit. */
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__asm__("nop");
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adc_reset_calibration(ADC1);
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while ((ADC_CR2(ADC1) & ADC_CR2_RSTCAL) != 0);
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adc_calibration(ADC1);
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while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0);
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}
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void my_usart_print_int(u32 usart, int value)
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{
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s8 i;
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u8 nr_digits = 0;
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char buffer[25];
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if (value < 0) {
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usart_send_blocking(usart, '-');
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value = value * -1;
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}
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while (value > 0) {
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buffer[nr_digits++] = "0123456789"[value % 10];
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value /= 10;
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}
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for (i = (nr_digits - 1); i >= 0; i--) {
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usart_send_blocking(usart, buffer[i]);
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}
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usart_send_blocking(usart, '\r');
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}
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int main(void)
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{
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u8 channel_array[16];
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u16 temperature = 0;
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rcc_clock_setup_in_hse_12mhz_out_72mhz();
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gpio_setup();
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usart_setup();
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timer_setup();
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adc_setup();
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gpio_set(GPIOA, GPIO8); /* LED1 on */
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gpio_set(GPIOC, GPIO15); /* LED2 on */
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/* Send a message on USART1. */
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usart_send_blocking(USART2, 's');
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usart_send_blocking(USART2, 't');
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usart_send_blocking(USART2, 'm');
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usart_send_blocking(USART2, '\r');
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usart_send_blocking(USART2, '\n');
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/* Select the channel we want to convert. 16=temperature_sensor. */
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channel_array[0] = 16;
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/* Set the injected sequence here, with number of channels */
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adc_set_injected_sequence(ADC1, 1, channel_array);
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/* Continously convert and poll the temperature ADC. */
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while (1) {
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/*
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* Since the injected sampling is triggered by the timer, it gets
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* updated automatically, we just need to periodically read out the value.
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* It would be better to check if the JEOC bit is set, and clear it following
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* so that you do not read the same value twice, especially for a slower
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* sampling rate.
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*/
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|
||||
temperature = ADC_JDR1(ADC1); //get the result from ADC_JDR1 on ADC1 (only bottom 16bits)
|
||||
|
||||
/*
|
||||
* That's actually not the real temperature - you have to compute it
|
||||
* as described in the datasheet.
|
||||
*/
|
||||
my_usart_print_int(USART2, temperature);
|
||||
|
||||
gpio_toggle(GPIOA, GPIO8); /* LED2 on */
|
||||
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
##
|
||||
## This file is part of the libopencm3 project.
|
||||
##
|
||||
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
||||
##
|
||||
## This library is free software: you can redistribute it and/or modify
|
||||
## it under the terms of the GNU Lesser General Public License as published by
|
||||
## the Free Software Foundation, either version 3 of the License, or
|
||||
## (at your option) any later version.
|
||||
##
|
||||
## This library is distributed in the hope that it will be useful,
|
||||
## but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
## GNU Lesser General Public License for more details.
|
||||
##
|
||||
## You should have received a copy of the GNU Lesser General Public License
|
||||
## along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
##
|
||||
|
||||
BINARY = adc
|
||||
# Comment the following line if you _don't_ have luftboot flashed!
|
||||
LDFLAGS += -Wl,-Ttext=0x8002000
|
||||
CFLAGS += -std=c99
|
||||
LDSCRIPT = ../lisa-m.ld
|
||||
|
||||
include ../../Makefile.include
|
||||
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
------------------------------------------------------------------------------
|
||||
README
|
||||
------------------------------------------------------------------------------
|
||||
|
||||
This is a simple example that sends the value read out from the
|
||||
temperature sensor ADC channel of the STM32 to the USART2.
|
||||
|
||||
This example uses a timer trigger to sample an injected adc channel and
|
||||
then uses an interrupt routine to retrieve the sample from the data register.
|
||||
|
||||
The terminal settings for the receiving device/PC are 115200 8n1.
|
||||
|
||||
|
|
@ -0,0 +1,211 @@
|
|||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||
* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
|
||||
* Copyright (C) 2012 Stephen Dwyer <dwyer.sc@gmail.com>
|
||||
*
|
||||
* This library is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <libopencm3/stm32/f1/rcc.h>
|
||||
#include <libopencm3/stm32/f1/flash.h>
|
||||
#include <libopencm3/stm32/f1/gpio.h>
|
||||
#include <libopencm3/stm32/f1/adc.h>
|
||||
#include <libopencm3/stm32/usart.h>
|
||||
#include <libopencm3/stm32/timer.h>
|
||||
#include <libopencm3/stm32/nvic.h>
|
||||
|
||||
volatile u16 temperature = 0;
|
||||
|
||||
void usart_setup(void)
|
||||
{
|
||||
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
||||
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
|
||||
|
||||
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
|
||||
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
|
||||
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
|
||||
|
||||
/* Setup UART parameters. */
|
||||
usart_set_baudrate(USART2, 115200);
|
||||
usart_set_databits(USART2, 8);
|
||||
usart_set_stopbits(USART2, USART_STOPBITS_1);
|
||||
usart_set_mode(USART2, USART_MODE_TX_RX);
|
||||
usart_set_parity(USART2, USART_PARITY_NONE);
|
||||
usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
|
||||
|
||||
/* Finally enable the USART. */
|
||||
usart_enable(USART2);
|
||||
}
|
||||
|
||||
void gpio_setup(void)
|
||||
{
|
||||
/* Enable GPIO clocks. */
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
|
||||
|
||||
/* Setup the LEDs. */
|
||||
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
|
||||
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
|
||||
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
|
||||
GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
|
||||
}
|
||||
|
||||
void timer_setup(void)
|
||||
{
|
||||
/* Set up the timer TIM2 for injected sampling */
|
||||
uint32_t timer;
|
||||
volatile uint32_t *rcc_apbenr;
|
||||
uint32_t rcc_apb;
|
||||
|
||||
timer = TIM2;
|
||||
rcc_apbenr = &RCC_APB1ENR;
|
||||
rcc_apb = RCC_APB1ENR_TIM2EN;
|
||||
|
||||
rcc_peripheral_enable_clock(rcc_apbenr, rcc_apb);
|
||||
|
||||
/* Time Base configuration */
|
||||
timer_reset(timer);
|
||||
timer_set_mode(timer, TIM_CR1_CKD_CK_INT,
|
||||
TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
|
||||
timer_set_period(timer, 0xFF);
|
||||
timer_set_prescaler(timer, 0x8);
|
||||
timer_set_clock_division(timer, 0x0);
|
||||
/* Generate TRGO on every update. */
|
||||
timer_set_master_mode(timer, TIM_CR2_MMS_UPDATE);
|
||||
timer_enable_counter(timer);
|
||||
}
|
||||
|
||||
void irq_setup(void)
|
||||
{
|
||||
/* Enable the adc1_2_isr() routine */
|
||||
nvic_set_priority(NVIC_ADC1_2_IRQ, 0);
|
||||
nvic_enable_irq(NVIC_ADC1_2_IRQ);
|
||||
}
|
||||
|
||||
void adc_setup(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
|
||||
|
||||
/* Make sure the ADC doesn't run during config. */
|
||||
adc_off(ADC1);
|
||||
|
||||
/* We configure everything for one single timer triggered injected conversion with interrupt generation. */
|
||||
/* While not needed for a single channel, try out scan mode which does all channels in one sweep and
|
||||
* generates the interrupt/EOC/JEOC flags set at the end of all channels, not each one.
|
||||
*/
|
||||
adc_enable_scan_mode(ADC1);
|
||||
adc_set_single_conversion_mode(ADC1);
|
||||
/* We want to start the injected conversion with the TIM2 TRGO */
|
||||
adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_TIM2_TRGO);
|
||||
/* Generate the ADC1_2_IRQ */
|
||||
adc_enable_jeoc_interrupt(ADC1);
|
||||
adc_set_right_aligned(ADC1);
|
||||
/* We want to read the temperature sensor, so we have to enable it. */
|
||||
adc_enable_temperature_sensor(ADC1);
|
||||
adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
|
||||
|
||||
adc_on(ADC1);
|
||||
|
||||
/* Wait for ADC starting up. */
|
||||
for (i = 0; i < 800000; i++) /* Wait a bit. */
|
||||
__asm__("nop");
|
||||
|
||||
adc_reset_calibration(ADC1);
|
||||
while ((ADC_CR2(ADC1) & ADC_CR2_RSTCAL) != 0);
|
||||
adc_calibration(ADC1);
|
||||
while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0);
|
||||
}
|
||||
|
||||
void my_usart_print_int(u32 usart, int value)
|
||||
{
|
||||
s8 i;
|
||||
u8 nr_digits = 0;
|
||||
char buffer[25];
|
||||
|
||||
if (value < 0) {
|
||||
usart_send_blocking(usart, '-');
|
||||
value = value * -1;
|
||||
}
|
||||
|
||||
while (value > 0) {
|
||||
buffer[nr_digits++] = "0123456789"[value % 10];
|
||||
value /= 10;
|
||||
}
|
||||
|
||||
for (i = (nr_digits - 1); i >= 0; i--) {
|
||||
usart_send_blocking(usart, buffer[i]);
|
||||
}
|
||||
|
||||
usart_send_blocking(usart, '\r');
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
u8 channel_array[16];
|
||||
|
||||
rcc_clock_setup_in_hse_12mhz_out_72mhz();
|
||||
gpio_setup();
|
||||
usart_setup();
|
||||
timer_setup();
|
||||
irq_setup();
|
||||
adc_setup();
|
||||
|
||||
gpio_set(GPIOA, GPIO8); /* LED1 on */
|
||||
gpio_set(GPIOC, GPIO15); /* LED2 on */
|
||||
|
||||
/* Send a message on USART1. */
|
||||
usart_send_blocking(USART2, 's');
|
||||
usart_send_blocking(USART2, 't');
|
||||
usart_send_blocking(USART2, 'm');
|
||||
usart_send_blocking(USART2, '\r');
|
||||
usart_send_blocking(USART2, '\n');
|
||||
|
||||
/* Select the channel we want to convert. 16=temperature_sensor. */
|
||||
channel_array[0] = 16;
|
||||
/* Set the injected sequence here, with number of channels */
|
||||
adc_set_injected_sequence(ADC1, 1, channel_array);
|
||||
|
||||
/* Continously convert and poll the temperature ADC. */
|
||||
while (1) {
|
||||
/*
|
||||
* Since sampling is triggered by the timer and copying the value
|
||||
* out of the data register is handled by the interrupt routine,
|
||||
* we just need to print the value and toggle the LED. It may be useful
|
||||
* to buffer the adc values in some cases.
|
||||
*/
|
||||
|
||||
/*
|
||||
* That's actually not the real temperature - you have to compute it
|
||||
* as described in the datasheet.
|
||||
*/
|
||||
my_usart_print_int(USART2, temperature);
|
||||
|
||||
gpio_toggle(GPIOA, GPIO8); /* LED2 on */
|
||||
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void adc1_2_isr(void)
|
||||
{
|
||||
/* Clear Injected End Of Conversion (JEOC) */
|
||||
ADC_SR(ADC1) &= ~ADC_SR_JEOC;
|
||||
temperature = ADC_JDR1(ADC1);
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
##
|
||||
## This file is part of the libopencm3 project.
|
||||
##
|
||||
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
||||
##
|
||||
## This library is free software: you can redistribute it and/or modify
|
||||
## it under the terms of the GNU Lesser General Public License as published by
|
||||
## the Free Software Foundation, either version 3 of the License, or
|
||||
## (at your option) any later version.
|
||||
##
|
||||
## This library is distributed in the hope that it will be useful,
|
||||
## but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
## GNU Lesser General Public License for more details.
|
||||
##
|
||||
## You should have received a copy of the GNU Lesser General Public License
|
||||
## along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
##
|
||||
|
||||
BINARY = adc
|
||||
# Comment the following line if you _don't_ have luftboot flashed!
|
||||
LDFLAGS += -Wl,-Ttext=0x8002000
|
||||
CFLAGS += -std=c99
|
||||
LDSCRIPT = ../lisa-m.ld
|
||||
|
||||
include ../../Makefile.include
|
||||
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
------------------------------------------------------------------------------
|
||||
README
|
||||
------------------------------------------------------------------------------
|
||||
|
||||
This is a simple example that sends the values read out from four ADC
|
||||
channels of the STM32 to the USART2.
|
||||
|
||||
This example uses a timer trigger to sample the injected adc channels and
|
||||
then uses an interrupt routine to retrieve the samples from the data registers.
|
||||
|
||||
The terminal settings for the receiving device/PC are 115200 8n1.
|
||||
|
||||
|
|
@ -0,0 +1,230 @@
|
|||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||
* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
|
||||
* Copyright (C) 2012 Stephen Dwyer <dwyer.sc@gmail.com>
|
||||
*
|
||||
* This library is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <libopencm3/stm32/f1/rcc.h>
|
||||
#include <libopencm3/stm32/f1/flash.h>
|
||||
#include <libopencm3/stm32/f1/gpio.h>
|
||||
#include <libopencm3/stm32/f1/adc.h>
|
||||
#include <libopencm3/stm32/usart.h>
|
||||
#include <libopencm3/stm32/timer.h>
|
||||
#include <libopencm3/stm32/nvic.h>
|
||||
|
||||
volatile u16 temperature = 0;
|
||||
volatile u16 v_refint = 0;
|
||||
volatile u16 lisam_adc1 = 0;
|
||||
volatile u16 lisam_adc2 = 0;
|
||||
u8 channel_array[4]; /* for injected sampling, 4 channels max, for regular, 16 max */
|
||||
|
||||
void usart_setup(void)
|
||||
{
|
||||
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
||||
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
|
||||
|
||||
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
|
||||
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
|
||||
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
|
||||
|
||||
/* Setup UART parameters. */
|
||||
usart_set_baudrate(USART2, 115200);
|
||||
usart_set_databits(USART2, 8);
|
||||
usart_set_stopbits(USART2, USART_STOPBITS_1);
|
||||
usart_set_mode(USART2, USART_MODE_TX_RX);
|
||||
usart_set_parity(USART2, USART_PARITY_NONE);
|
||||
usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
|
||||
|
||||
/* Finally enable the USART. */
|
||||
usart_enable(USART2);
|
||||
}
|
||||
|
||||
void gpio_setup(void)
|
||||
{
|
||||
/* Enable GPIO clocks. */
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
|
||||
|
||||
/* Setup the LEDs. */
|
||||
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
|
||||
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
|
||||
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
|
||||
GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
|
||||
|
||||
/* Setup Lisa/M v2 ADC1,2 on ANALOG1 connector */
|
||||
gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, \
|
||||
GPIO3 | GPIO0 );
|
||||
}
|
||||
|
||||
void timer_setup(void)
|
||||
{
|
||||
/* Set up the timer TIM2 for injected sampling */
|
||||
uint32_t timer;
|
||||
volatile uint32_t *rcc_apbenr;
|
||||
uint32_t rcc_apb;
|
||||
|
||||
timer = TIM2;
|
||||
rcc_apbenr = &RCC_APB1ENR;
|
||||
rcc_apb = RCC_APB1ENR_TIM2EN;
|
||||
|
||||
rcc_peripheral_enable_clock(rcc_apbenr, rcc_apb);
|
||||
|
||||
/* Time Base configuration */
|
||||
timer_reset(timer);
|
||||
timer_set_mode(timer, TIM_CR1_CKD_CK_INT,
|
||||
TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
|
||||
timer_set_period(timer, 0xFF);
|
||||
timer_set_prescaler(timer, 0x8);
|
||||
timer_set_clock_division(timer, 0x0);
|
||||
/* Generate TRGO on every update. */
|
||||
timer_set_master_mode(timer, TIM_CR2_MMS_UPDATE);
|
||||
timer_enable_counter(timer);
|
||||
}
|
||||
|
||||
void irq_setup(void)
|
||||
{
|
||||
/* Enable the adc1_2_isr() routine */
|
||||
nvic_set_priority(NVIC_ADC1_2_IRQ, 0);
|
||||
nvic_enable_irq(NVIC_ADC1_2_IRQ);
|
||||
}
|
||||
|
||||
void adc_setup(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
|
||||
|
||||
/* Make sure the ADC doesn't run during config. */
|
||||
adc_off(ADC1);
|
||||
|
||||
/* We configure everything for one single timer triggered injected conversion with interrupt generation. */
|
||||
/* While not needed for a single channel, try out scan mode which does all channels in one sweep and
|
||||
* generates the interrupt/EOC/JEOC flags set at the end of all channels, not each one.
|
||||
*/
|
||||
adc_enable_scan_mode(ADC1);
|
||||
adc_set_single_conversion_mode(ADC1);
|
||||
/* We want to start the injected conversion with the TIM2 TRGO */
|
||||
adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_TIM2_TRGO);
|
||||
/* Generate the ADC1_2_IRQ */
|
||||
adc_enable_jeoc_interrupt(ADC1);
|
||||
adc_set_right_aligned(ADC1);
|
||||
/* We want to read the temperature sensor, so we have to enable it. */
|
||||
adc_enable_temperature_sensor(ADC1);
|
||||
adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
|
||||
|
||||
/* Select the channels we want to convert.
|
||||
* 16=temperature_sensor, 17=Vrefint, 13=ADC1, 10=ADC2
|
||||
*/
|
||||
channel_array[0] = 16;
|
||||
channel_array[1] = 17;
|
||||
channel_array[2] = 13;
|
||||
channel_array[3] = 10;
|
||||
adc_set_injected_sequence(ADC1, 4, channel_array);
|
||||
|
||||
adc_on(ADC1);
|
||||
|
||||
/* Wait for ADC starting up. */
|
||||
for (i = 0; i < 800000; i++) /* Wait a bit. */
|
||||
__asm__("nop");
|
||||
|
||||
adc_reset_calibration(ADC1);
|
||||
while ((ADC_CR2(ADC1) & ADC_CR2_RSTCAL) != 0); //added this check
|
||||
adc_calibration(ADC1);
|
||||
while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0); //added this check
|
||||
}
|
||||
|
||||
void my_usart_print_int(u32 usart, int value)
|
||||
{
|
||||
s8 i;
|
||||
u8 nr_digits = 0;
|
||||
char buffer[25];
|
||||
|
||||
if (value < 0) {
|
||||
usart_send_blocking(usart, '-');
|
||||
value = value * -1;
|
||||
}
|
||||
|
||||
while (value > 0) {
|
||||
buffer[nr_digits++] = "0123456789"[value % 10];
|
||||
value /= 10;
|
||||
}
|
||||
|
||||
for (i = (nr_digits - 1); i >= 0; i--) {
|
||||
usart_send_blocking(usart, buffer[i]);
|
||||
}
|
||||
|
||||
//usart_send_blocking(usart, '\r');
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
|
||||
rcc_clock_setup_in_hse_12mhz_out_72mhz();
|
||||
gpio_setup();
|
||||
usart_setup();
|
||||
timer_setup();
|
||||
irq_setup();
|
||||
adc_setup();
|
||||
|
||||
gpio_set(GPIOA, GPIO8); /* LED1 off */
|
||||
gpio_set(GPIOC, GPIO15); /* LED5 off */
|
||||
|
||||
/* Send a message on USART1. */
|
||||
usart_send_blocking(USART2, 's');
|
||||
usart_send_blocking(USART2, 't');
|
||||
usart_send_blocking(USART2, 'm');
|
||||
usart_send_blocking(USART2, '\r');
|
||||
usart_send_blocking(USART2, '\n');
|
||||
|
||||
/* Moved the channel selection and sequence init to adc_setup() */
|
||||
|
||||
/* Continously convert and poll the temperature ADC. */
|
||||
while (1) {
|
||||
/*
|
||||
* Since sampling is triggered by the timer and copying the values
|
||||
* out of the data registers is handled by the interrupt routine,
|
||||
* we just need to print the values and toggle the LED. It may be useful
|
||||
* to buffer the adc values in some cases.
|
||||
*/
|
||||
|
||||
my_usart_print_int(USART2, temperature);
|
||||
usart_send_blocking(USART2, ' ');
|
||||
my_usart_print_int(USART2, v_refint);
|
||||
usart_send_blocking(USART2, ' ');
|
||||
my_usart_print_int(USART2, lisam_adc1);
|
||||
usart_send_blocking(USART2, ' ');
|
||||
my_usart_print_int(USART2, lisam_adc2);
|
||||
usart_send_blocking(USART2, '\r');
|
||||
|
||||
gpio_toggle(GPIOA, GPIO8); /* LED2 on */
|
||||
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void adc1_2_isr(void)
|
||||
{
|
||||
/* Clear Injected End Of Conversion (JEOC) */
|
||||
ADC_SR(ADC1) &= ~ADC_SR_JEOC;
|
||||
temperature = ADC_JDR1(ADC1);
|
||||
v_refint = ADC_JDR2(ADC1);
|
||||
lisam_adc1 = ADC_JDR3(ADC1);
|
||||
lisam_adc2 = ADC_JDR4(ADC1);
|
||||
}
|
||||
Loading…
Reference in New Issue