串口接收中断

只看该作者 · 2018-4-24 21:55

一个串口接收中断程序，运行后还没发送数据就一直不停的进入中断，主程序和中断服务程序如下..
//*****************************************************************************
//
// UART1 Interrupt Service Routine
//
//*****************************************************************************
void
am_uart1_isr(void)
{
uint32_t status;
uint32_t rxSize, txSize;

status = am_hal_uart_int_status_get(1, false);

am_hal_uart_int_clear(1, status);

if (status & (AM_HAL_UART_INT_RX_TMOUT | AM_HAL_UART_INT_TX | AM_HAL_UART_INT_RX))
{
      am_hal_uart_service_buffered_timeout_save(1, status);
}

if (status & (AM_HAL_UART_INT_RX_TMOUT))
{
      g_ui8RxTimeoutFlag = 1;
      am_util_stdio_printf("\nTMOUT, ");
}

am_hal_uart_get_status_buffered(1, &rxSize, &txSize);

if (status & (AM_HAL_UART_INT_RX))
{
      am_util_stdio_printf(", RX ");
}

if (status & (AM_HAL_UART_INT_TXCMP))
{
      am_util_stdio_printf(", TXCMP");
}

am_hal_uart_get_status_buffered(1, &rxSize, &txSize);

if (rxSize >= UART_BUFFER_SIZE / 2)
{
      g_ui8BufferFullFlag = 1;
      am_util_stdio_printf(", RXF");
}
}

//*****************************************************************************
//
// Main function.
//
//*****************************************************************************
int
main(void)
{
uint32_t ui32Module = AM_BSP_UART_PRINT_INST;
char pcTempBuf[UART_BUFFER_SIZE + 1];
uint32_t ui32Length;

//
// Set the clock frequency.
//
am_hal_clkgen_sysclk_select(AM_HAL_CLKGEN_SYSCLK_MAX);

//
// Set the default cache configuration
//
am_hal_cachectrl_enable(&am_hal_cachectrl_defaults);

//
// Configure the board for low power operation.
//
am_bsp_low_power_init();

// //
// // Initialize the printf interface for UART output.
// //
am_util_stdio_printf_init((am_util_stdio_print_char_t) am_bsp_itm_string_print);
am_bsp_pin_enable(ITM_SWO);
am_bsp_debug_printf_enable();
am_hal_itm_enable();
am_util_stdio_printf_init((am_util_stdio_print_char_t)am_bsp_uart_string_print);

//
// Initialize and Enable the UART.
//
uart_init(ui32Module);
uart_enable(ui32Module);

am_hal_interrupt_master_enable();

//
// Print the banner.
//
am_util_stdio_printf("UART FIFO Example\n");
am_util_stdio_printf("Note - the UART terminal operates at 115,200 BAUD, 8 bit, no parity.\n");
uart_transmit_delay(ui32Module);
am_util_stdio_printf("\n\tEcho back the UART received data.\n");
uart_transmit_delay(ui32Module);
am_util_stdio_printf("\t");
uart_transmit_delay(ui32Module);

//
// Loop forever writing chars to the stimulus register.
//
while (1)
{
      //
      // Need to retrieve and echo received date for loopback
      // if either all the data has been received, or if we are in danger
      // of overflowing the receive buffer
      //
      if (g_ui8RxTimeoutFlag || g_ui8BufferFullFlag)
      {

         g_ui8RxTimeoutFlag = 0;
         g_ui8BufferFullFlag = 0;

         memset(pcTempBuf, 0x00, sizeof(pcTempBuf));

         ui32Length = am_hal_uart_char_receive_buffered(ui32Module, pcTempBuf, UART_BUFFER_SIZE);

         if (ui32Length)
         {
            if ( pcTempBuf[0] == '\n' )
            {
                  am_util_stdio_printf("START_TX (char='\\n')");
            }
            else
            {
                  am_util_stdio_printf("START_TX (char='%c')", pcTempBuf[0]);
            }

            //
            // We have overallocated the pcTempBuf, to make sure ui32Length==UART_BUFFER_SIZE is ok
            //
            pcTempBuf[ui32Length] = 0;
            am_hal_uart_string_transmit_buffered(ui32Module, pcTempBuf);
         }
      }
}
}