78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* Oct 2017 Karl Palsson <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/crs.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/syscfg.h>
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#include <libopencm3/stm32/usart.h>
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#include "uart-basic.h"
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#define LED_NUC_RCC RCC_GPIOA
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#define LED_NUC_PORT GPIOA
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#define LED_NUC_PIN GPIO5
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void usart2_isr(void)
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{
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ub_irq_handler();
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}
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static void setup_rcc_hack(void)
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{
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/* FIXME L0 doesn't have rcc setup helpers (yet) */
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rcc_osc_on(RCC_HSI16);
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rcc_wait_for_osc_ready(RCC_HSI16);
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rcc_set_sysclk_source(RCC_HSI16);
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/* ok, we manually poked around, let the lib know */
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rcc_apb1_frequency = rcc_apb2_frequency = 16e6;
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}
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static void board_init(void)
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{
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rcc_periph_clock_enable(RCC_GPIOA);
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2 | GPIO3);
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/* usart is AF4 */
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gpio_set_af(GPIOA, GPIO_AF4, GPIO2 | GPIO3);
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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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int j = 0;
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setup_rcc_hack();
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board_init();
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struct ub_hw ub = {
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.uart = USART2,
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.uart_nvic = NVIC_USART2_IRQ,
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.uart_rcc = RCC_USART2,
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};
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ub_init(&ub);
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printf("hi guys!\n");
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/* green led for ticking */
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rcc_periph_clock_enable(LED_NUC_RCC);
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gpio_mode_setup(LED_NUC_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
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LED_NUC_PIN);
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while (1) {
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gpio_toggle(LED_NUC_PORT, LED_NUC_PIN);
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for (i = 0; i < 0x40000; i++) { /* Wait a bit. */
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__asm__("NOP");
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}
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ub_task();
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gpio_toggle(LED_NUC_PORT, LED_NUC_PIN);
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for (i = 0; i < 0x40000; i++) { /* Wait a bit. */
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__asm__("NOP");
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}
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}
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return 0;
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}
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