156 lines
4.0 KiB
C
156 lines
4.0 KiB
C
/*
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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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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/i2c.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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#include <libcommon/iob.h>
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#include <stdio.h>
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#include "attenuator.h"
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#include "misc.h"
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extern const struct attenuator_cfg board_att_cfg;
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extern struct attenuator_state *board_att_st[];
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volatile uint32_t jiffies;
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void sys_tick_handler(void)
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{
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jiffies++;
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}
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/* busy wait specified number of ms */
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void msleep(uint32_t delay)
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{
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uint32_t wake = jiffies + delay;
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do {
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} while (wake > jiffies);
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}
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static void clock_setup(void)
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{
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rcc_clock_setup_in_hsi_out_48mhz();
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/* HCLK=48MHz; ADC=6MHz; APB1=24MHz; APB2=48MHz; USB=48MHz */
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/* tick rate of 1ms */
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systick_set_reload(48000);
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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systick_counter_enable();
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systick_interrupt_enable();
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/* Enable GPIOC clock. */
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rcc_periph_clock_enable(RCC_GPIOA);
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rcc_periph_clock_enable(RCC_GPIOB);
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rcc_periph_clock_enable(RCC_GPIOC);
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/* Enable clocks for USARTs */
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rcc_periph_clock_enable(RCC_USART1);
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rcc_periph_clock_enable(RCC_USART2);
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}
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static void i2c_setup(void)
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{
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rcc_periph_clock_enable(RCC_I2C1);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN,
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GPIO_I2C1_SCL | GPIO_I2C1_SDA);
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/* disable before making config changes */
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i2c_peripheral_disable(I2C1);
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/* APB1 runs at 24 MHz */
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i2c_set_clock_frequency(I2C1, I2C_CR2_FREQ_24MHZ);
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/* 400 kHz fast mode I2C */
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//i2c_set_fast_mode(I2C1);
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//...
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i2c_peripheral_enable(I2C1);
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}
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static void usart_setup(void)
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{
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/* USART1: connected to debug header */
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/* Setup GPIO pin GPIO_USART1_TX. */
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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);
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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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/* USART2: connected to 2.5mm stereo jack */
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/* Setup GPIO pin GPIO_USART2_TX. */
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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);
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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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static void gpio_setup(void)
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{
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/* Set GPIO15 (in GPIO port B) to 'output push-pull'. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
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}
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int main(void)
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{
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clock_setup();
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gpio_setup();
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usart_setup();
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iob_init(USART2);
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i2c_setup();
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attenuator_init(&board_att_cfg, board_att_st);
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/* Blink the LED (PB15) on the board with every transmitted byte. */
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while (1) {
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int i;
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gpio_toggle(GPIOB, GPIO15); /* LED on/off */
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printf("Hello world\r\n");
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for (i = 0; i < 800000; i++) /* Wait a bit. */
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__asm__("nop");
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}
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return 0;
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}
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