usart_interrupt.c

This example shows how to receive bytes over the USART with interrupts.

/*
 * This example shows how to receive bytes over the USART with interrupts.
 * As UART the CARME_UART0 is used with the configuration 115200 8n1.
 * The received bytes will be sent back to the CARME_UART0 (echo).
 */

#include <stm32f4xx.h>
#include <carme.h>
#include <uart.h>

uint8_t x = 0, y = 1;

int main(void) {

    USART_InitTypeDef USART_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    USART_StructInit(&USART_InitStruct);
    USART_InitStruct.USART_BaudRate = 115200;
    CARME_UART_Init(CARME_UART0, &USART_InitStruct);

    USART_Cmd(CARME_UART0, DISABLE);
    USART_ITConfig(CARME_UART0, USART_IT_RXNE, ENABLE);
    USART_Cmd(CARME_UART0, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x0F;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x0F;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    for (;;) {
    }
    return 0U;
}

void USART1_IRQHandler(void) {
    uint8_t c;
    while (USART_GetITStatus(CARME_UART0, USART_IT_RXNE) != RESET) {
        c = USART_ReceiveData(CARME_UART0);
        USART_SendData(CARME_UART0, c);
    }
}