156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*
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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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*
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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_APB2ENR, RCC_APB2ENR_USART1EN);
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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_USART1_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 115200);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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usart_set_mode(USART1, USART_MODE_TX_RX);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOB clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
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/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
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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 conversion. */
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adc_disable_scan_mode(ADC1);
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adc_set_single_conversion_mode(ADC1);
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adc_enable_discontinous_mode_regular(ADC1);
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adc_disable_external_trigger_regular(ADC1);
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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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adc_calibration(ADC1);
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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(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; i >= 0; i--)
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usart_send(usart, buffer[i]);
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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;
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rcc_clock_setup_in_hse_16mhz_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_clear(GPIOB, GPIO7); /* LED1 on */
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gpio_set(GPIOB, GPIO6); /* LED2 off */
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/* Send a message on USART1. */
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usart_send(USART1, 's');
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usart_send(USART1, 't');
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usart_send(USART1, 'm');
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usart_send(USART1, '\r');
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usart_send(USART1, '\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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adc_set_regular_sequence(ADC1, 1, channel_array);
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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 the conversion.
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*/
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adc_on(ADC1);
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/* Wait for end of conversion. */
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while (!(ADC_SR(ADC1) & ADC_SR_EOC));
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temperature = ADC_DR(ADC1);
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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(USART1, temperature);
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gpio_clear(GPIOB, GPIO6); /* LED2 on */
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while(1); /* Halt. */
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return 0;
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}
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