149 lines
3.6 KiB
C
149 lines
3.6 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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* Copyright (C) 2011 Piotr Esden-Tempski <piotr@esden.net>
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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/gpio.h>
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/* Set STM32 to 72 MHz. */
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void clock_setup(void)
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{
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rcc_clock_setup_in_hse_12mhz_out_72mhz();
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/* Enable GPIOA, GPIOB, GPIOC, and AFIO 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_IOPBEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
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}
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void gpio_setup(void)
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{
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/* LED1 */
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/* Set GPIO8 (in GPIO port A) to 'output push-pull'. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
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/* LED2 */
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/* Set GPIO15 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
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/* JTAG_TRST */
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/* Set GPIO4 (in GPIO port B) to 'output push-pull'. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO4);
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AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_FULL_SWJ_NO_JNTRST;
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/* ADC4 */
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/* Set GPIO5 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
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/* ADC6 */
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/* Set GPIO2 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO2);
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/* Preconfigure the LEDs. */
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gpio_set(GPIOA, GPIO8);
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gpio_set(GPIOC, GPIO15);
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gpio_set(GPIOB, GPIO4);
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gpio_set(GPIOC, GPIO5);
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gpio_set(GPIOC, GPIO2);
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}
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void led_set(int id, int on)
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{
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if (on) {
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switch (id) {
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case 0:
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gpio_clear(GPIOA, GPIO8); /* LED1 On */
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break;
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case 1:
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gpio_clear(GPIOB, GPIO4); /* JTAG_TRST On */
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break;
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case 2:
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gpio_clear(GPIOC, GPIO2); /* ADC6 On */
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break;
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case 3:
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gpio_clear(GPIOC, GPIO5); /* ADC4 On */
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break;
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case 4:
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gpio_clear(GPIOC, GPIO15); /* LED2 On */
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break;
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}
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} else {
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switch (id) {
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case 0:
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gpio_set(GPIOA, GPIO8); /* LED1 On */
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break;
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case 1:
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gpio_set(GPIOB, GPIO4); /* JTAG_TRST On */
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break;
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case 2:
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gpio_set(GPIOC, GPIO2); /* ADC6 On */
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break;
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case 3:
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gpio_set(GPIOC, GPIO5); /* ADC4 On */
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break;
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case 4:
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gpio_set(GPIOC, GPIO15); /* LED2 On */
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break;
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}
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}
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}
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void led_advance(void)
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{
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static int state = 0;
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if (state < 5) {
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led_set(state, 1);
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} else if (state < 10) {
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led_set(state - 5, 0);
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} else if (state < 15) {
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led_set(14 - state, 1);
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} else if (state < 20) {
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led_set(19 - state, 0);
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}
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state++;
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if(state == 20) state = 0;
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}
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int main(void)
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{
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int i;
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clock_setup();
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gpio_setup();
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/* Blink the LEDs (PC13 and PB4) on the board. */
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while (1) {
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led_advance();
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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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