NXP RT1011串口4中断方式例程

以下是 NXP RT1011 串口 4 中断方式的示例代码：

#include "fsl_common.h"
#include "fsl_iomuxc.h"
#include "fsl_debug_console.h"
#include "fsl_uart.h"
#include "board.h"

#include "pin_mux.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define DEMO_UART UART4
#define DEMO_UART_CLK_FREQ CLOCK_GetFlexCommClkFreq(4U)
#define DEMO_UART_IRQn UART4_IRQn
#define DEMO_UART_IRQHandler UART4_IRQHandler

/*******************************************************************************
 * Prototypes
 ******************************************************************************/

/*******************************************************************************
 * Variables
 ******************************************************************************/

uint8_t txbuff[] = "UART polling example\r\nBoard will send back received characters\r\n";
uint8_t rxbuff[20] = {0};

volatile bool rxBufferEmpty = true;

/*******************************************************************************
 * Code
 ******************************************************************************/

void DEMO_UART_IRQHandler(void)
{
    uint8_t data;

    if ((kUART_RxDataRegFullFlag | kUART_RxOverrunFlag) & UART_GetStatusFlags(DEMO_UART))
    {
        data = UART_ReadByte(DEMO_UART);
        rxBufferEmpty = false;
        UART_WriteByte(DEMO_UART, data);
    }
}

/*!
 * @brief Main function
 */
int main(void)
{
    uart_config_t config;

    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();

    PRINTF("UART example start\r\n");

    /* attach 12 MHz clock to FLEXCOMM4 (UART4) */
    CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);

    /* reset FLEXCOMM for UART */
    RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn);

    /* Initialize UART with configuration. */
    UART_GetDefaultConfig(&config);
    config.baudRate_Bps = 115200U;
    config.enableTx = true;
    config.enableRx = true;

    UART_Init(DEMO_UART, &config, DEMO_UART_CLK_FREQ);
    UART_WriteBlocking(DEMO_UART, txbuff, sizeof(txbuff) - 1);

    /* Enable RX interrupt. */
    UART_EnableInterrupts(DEMO_UART, kUART_RxDataRegFullInterruptEnable | kUART_RxOverrunInterruptEnable);
    EnableIRQ(DEMO_UART_IRQn);

    while (1)
    {
        if (!rxBufferEmpty)
        {
            rxBufferEmpty = true;
            memset(rxbuff, 0, sizeof(rxbuff));
            UART_ReadBlocking(DEMO_UART, rxbuff, sizeof(rxbuff) - 1);
            PRINTF("Data received: %s\r\n", rxbuff);
        }
    }
}

该示例代码演示了如何在 NXP RT1011 上使用串口 4 实现中断方式的数据收发。代码中首先配置了串口 4 的中断，然后通过中断方式接收数据，并在接收到数据后进行打印输出。您可以根据实际需求进行修改。