77 lines
1.6 KiB
C
77 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/flash.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/pwr.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/usart.h>
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#include "uart-basic.h"
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#define LED_DISCO_GREEN_RCC RCC_GPIOE
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#define LED_DISCO_GREEN_PORT GPIOE
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#define LED_DISCO_GREEN_PIN GPIO8
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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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pwr_set_vos_scale(PWR_SCALE1);
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flash_set_ws(FLASH_ACR_LATENCY_2WS);
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rcc_set_msi_range(RCC_CR_MSIRANGE_48MHZ);
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/* ok, we manually poked around, let the lib know */
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rcc_apb1_frequency = rcc_apb2_frequency = 48e6;
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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_GPIOD);
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gpio_mode_setup(GPIOD, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO5 | GPIO6);
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/* usart2 is AF7 */
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gpio_set_af(GPIOD, GPIO_AF7, GPIO5 | GPIO6);
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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_DISCO_GREEN_RCC);
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gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
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LED_DISCO_GREEN_PIN);
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while (1) {
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gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
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for (i = 0; i < 0xa0000; 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_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
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for (i = 0; i < 0xa0000; 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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