118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* Karl Palsson, 2012 <karlp@tweak.net.au
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/l1/rcc.h>
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#include <libopencm3/stm32/l1/gpio.h>
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/usart.h>
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#include "syscfg.h"
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static struct state_t state;
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void clock_setup(void) {
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/* Lots of things on all ports... */
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rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_GPIOAEN);
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rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_GPIOBEN);
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/* Enable clocks for USART2. */
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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}
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void gpio_setup(void) {
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gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_DISCO_GREEN_PIN);
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/* Setup GPIO pins for USART2 transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
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/* Setup USART2 TX pin as alternate function. */
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gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
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}
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void usart_setup(void) {
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usart_set_baudrate(USART_CONSOLE, 115200);
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usart_set_databits(USART_CONSOLE, 8);
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usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
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usart_set_mode(USART_CONSOLE, USART_MODE_TX);
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usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
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usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART_CONSOLE);
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}
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/**
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* Use USART_CONSOLE as a console.
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* @param file
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* @param ptr
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* @param len
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* @return
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*/
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int _write(int file, char *ptr, int len) {
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int i;
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if (file == STDOUT_FILENO || file == STDERR_FILENO) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\n') {
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usart_send_blocking(USART_CONSOLE, '\r');
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}
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usart_send_blocking(USART_CONSOLE, ptr[i]);
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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void BUTTON_DISCO_USER_isr(void) {
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exti_reset_request(BUTTON_DISCO_USER_EXTI);
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if (state.falling) {
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state.falling = false;
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exti_set_trigger(BUTTON_DISCO_USER_EXTI, EXTI_TRIGGER_RISING);
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// ILOG("fell: %d\n", TIM_CNT(TIM7));
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puts("fell!\n");
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} else {
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puts("Rose!\n");
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// TIM_CNT(TIM7) = 0;
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state.falling = true;
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exti_set_trigger(BUTTON_DISCO_USER_EXTI, EXTI_TRIGGER_FALLING);
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}
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}
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void setup_buttons(void) {
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/* Enable EXTI0 interrupt. */
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nvic_enable_irq(BUTTON_DISCO_USER_NVIC);
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gpio_mode_setup(BUTTON_DISCO_USER_PORT, GPIO_MODE_INPUT, GPIO_PUPD_NONE, BUTTON_DISCO_USER_PIN);
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/* Configure the EXTI subsystem. */
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exti_select_source(BUTTON_DISCO_USER_EXTI, BUTTON_DISCO_USER_PORT);
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state.falling = false;
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exti_set_trigger(BUTTON_DISCO_USER_EXTI, EXTI_TRIGGER_RISING);
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exti_enable_request(BUTTON_DISCO_USER_EXTI);
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}
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int main(void) {
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int i;
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int j = 0;
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clock_setup();
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gpio_setup();
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usart_setup();
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puts("hi guys!\n");
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setup_buttons();
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while (1) {
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puts("tick:");
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putchar('a' + (j++ % 26));
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gpio_toggle(GPIOB, GPIO7); /* LED on/off */
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for (i = 0; i < 100000; 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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