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/*
* Oct 2017 Karl Palsson <karlp@tweak.net.au>
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/crs.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/syscfg.h>
#include <libopencm3/stm32/usart.h>
#include "uart-basic.h"
#define LED_DISCO_GREEN_RCC RCC_GPIOB
#define LED_DISCO_GREEN_PORT GPIOB
#define LED_DISCO_GREEN_PIN GPIO4
void usart1_isr(void)
{
ub_irq_handler();
}
static void setup_rcc_hack(void)
{
/* FIXME L0 doesn't have rcc setup helpers (yet) */
rcc_osc_on(RCC_HSI16);
rcc_wait_for_osc_ready(RCC_HSI16);
rcc_set_sysclk_source(RCC_HSI16);
/* HSI48 needs the vrefint turned on */
rcc_periph_clock_enable(RCC_SYSCFG);
SYSCFG_CFGR3 |= SYSCFG_CFGR3_ENREF_HSI48 | SYSCFG_CFGR3_EN_VREFINT;
while (!(SYSCFG_CFGR3 & SYSCFG_CFGR3_REF_HSI48_RDYF));
/* For USB, but can't use HSI48 as a sysclock on L0 */
crs_autotrim_usb_enable();
rcc_set_hsi48_source_rc48();
rcc_osc_on(RCC_HSI48);
rcc_wait_for_osc_ready(RCC_HSI48);
/* ok, we manually poked around, let the lib know */
rcc_apb1_frequency = rcc_apb2_frequency = 16e6;
}
static void board_init(void)
{
rcc_periph_clock_enable(RCC_GPIOA);
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9 | GPIO10);
/* usart1 is AF4 */
gpio_set_af(GPIOA, GPIO_AF4, GPIO9 | GPIO10);
}
int main(void)
{
int i;
int j = 0;
setup_rcc_hack();
board_init();
struct ub_hw ub = {
.uart = USART1,
.uart_nvic = NVIC_USART1_IRQ,
.uart_rcc = RCC_USART1,
};
ub_init(&ub);
printf("hi guys!\n");
/* green led for ticking */
rcc_periph_clock_enable(LED_DISCO_GREEN_RCC);
gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
LED_DISCO_GREEN_PIN);
while (1) {
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 0xa0000; i++) { /* Wait a bit. */
__asm__("NOP");
}
ub_task();
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 0xa0000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}
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