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/*
* Test code that just sends the letters 'a' to 'z' over and
* over again using USART1.
*
* Toggles the BLUE LED slowly and the YELLOW LED for every
* character sent.
*/
#include "stm_init.h"
#define DELAY() HAL_Delay(250)
UART_HandleTypeDef *huart;
/*
* If a newline is received on UART1 or UART2, redirect output to that UART.
*/
void check_uart_rx(UART_HandleTypeDef *this) {
uint8_t rx = 0;
if (HAL_UART_Receive(this, &rx, 1, 0) == HAL_OK) {
if (rx == '\n') {
HAL_GPIO_TogglePin(LED_PORT, LED_GREEN);
huart = this;
}
}
}
int
main()
{
uint8_t c = 'a';
stm_init();
huart = &huart1;
while (1)
{
HAL_GPIO_TogglePin(LED_PORT, LED_YELLOW);
HAL_UART_Transmit(huart, (uint8_t *) &c, 1, 0xff);
DELAY();
if (c++ == 'z') {
c = 'a';
HAL_GPIO_TogglePin(LED_PORT, LED_BLUE);
}
/* Check for UART change request */
check_uart_rx(&huart1);
check_uart_rx(&huart2);
}
}
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