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#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include "usart.h"
#define DELAY 1000000
#define RX_BUFFER_SIZE 1000
#define TX_BUFFER_SIZE 1000
void clock_init(void);
void gpio_init(void);
void delay(void);
USART usart3;
int main(void)
{
// setup
clock_init();
gpio_init();
uint8_t rx_buffer[RX_BUFFER_SIZE];
uint8_t tx_buffer[TX_BUFFER_SIZE];
usart_init(&usart3, rx_buffer, RX_BUFFER_SIZE, tx_buffer, TX_BUFFER_SIZE);
// welcome message
usart_writeln(&usart3, "This is a demo of USART via IRQ. Just type something!");
// return any input
uint8_t buff;
while(1){
if (usart_read_bytes(&usart3, &buff, 1)){
usart_write_bytes(&usart3, &buff, 1);
}
}
return 0;
}
void clock_init(void)
{
rcc_periph_clock_enable(RCC_GPIOC); // for PC13 blinking
}
void gpio_init(void)
{
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
gpio_clear(GPIOC, GPIO13);
gpio_set(GPIOC, GPIO13);
}
void delay(void)
{
for (int i = 0; i < DELAY; i++) {
__asm__("nop");
}
}
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