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我正在尝试使用 k66f 微控制器实现 flexcan 通信。作为第一步，我只想通过 tx 引脚发送消息。我的程序基于 NXP 的一个示例。

我对 C 语言非常陌生，特别是对微控制器编程。我运行的代码卡在以下行：

/* Wait until CAN Message send out. */
while (!FLEXCAN_GetMbStatusFlags(base, 1 << mbIdx))
{ 
}

我不知道代码的确切含​​义，因为据我了解， FLEXCAN_GetMbStatusFlags 不是函数。

提前致谢。

微控制器是nxp的k66f。

编辑：这是示例

#include "fsl_debug_console.h"
#include "fsl_flexcan.h"
#include "board.h"

#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define EXAMPLE_CAN CAN0
#define EXAMPLE_CAN_CLKSRC kCLOCK_BusClk
#define EXAMPLE_FLEXCAN_IRQn CAN0_ORed_Message_buffer_IRQn
#define EXAMPLE_FLEXCAN_IRQHandler CAN0_ORed_Message_buffer_IRQHandler
#define RX_MESSAGE_BUFFER_NUM (8)
#define TX_MESSAGE_BUFFER_NUM (9)
int status;
/*******************************************************************************
 * Prototypes
 ******************************************************************************/

/*******************************************************************************
 * Variables
 ******************************************************************************/
volatile bool rxComplete = false;
flexcan_frame_t txFrame, rxFrame;

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

/*!
 * @brief Main function
 */
int main(void)
{
    flexcan_config_t flexcanConfig;
    flexcan_rx_mb_config_t mbConfig;

    /* Initialize board hardware. */
    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();

    PRINTF("\r\n==FlexCAN loopback functional example -- Start.==\r\n\r\n");

    /* Init FlexCAN module. */
    /*
     * flexcanConfig.clkSrc = kFLEXCAN_ClkSrcOsc;
     * flexcanConfig.baudRate = 125000U;
     * flexcanConfig.maxMbNum = 16;
     * flexcanConfig.enableLoopBack = false;
     * flexcanConfig.enableSelfWakeup = false;
     * flexcanConfig.enableIndividMask = false;
     * flexcanConfig.enableDoze = false;
     */
    FLEXCAN_GetDefaultConfig(&flexcanConfig);
    flexcanConfig.clkSrc = kFLEXCAN_ClkSrcPeri;
    //flexcanConfig.enableLoopBack = true;
    FLEXCAN_Init(EXAMPLE_CAN, &flexcanConfig, CLOCK_GetFreq(EXAMPLE_CAN_CLKSRC));

    /* Setup Rx Message Buffer. */
    mbConfig.format = kFLEXCAN_FrameFormatStandard;
    mbConfig.type = kFLEXCAN_FrameTypeData;
    mbConfig.id = FLEXCAN_ID_STD(0x123);
    FLEXCAN_SetRxMbConfig(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &mbConfig, true);

    /* Setup Tx Message Buffer. */
    FLEXCAN_SetTxMbConfig(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, true);

    /* Enable Rx Message Buffer interrupt. */
    FLEXCAN_EnableMbInterrupts(EXAMPLE_CAN, 1 << RX_MESSAGE_BUFFER_NUM);
    EnableIRQ(EXAMPLE_FLEXCAN_IRQn);

    /* Prepare Tx Frame for sending. */
    txFrame.format = kFLEXCAN_FrameFormatStandard;
    txFrame.type = kFLEXCAN_FrameTypeData;
    txFrame.id = FLEXCAN_ID_STD(0x123);
    txFrame.length = 8;
    txFrame.dataWord0 = CAN_WORD0_DATA_BYTE_0(0x11) | CAN_WORD0_DATA_BYTE_1(0x22) | CAN_WORD0_DATA_BYTE_2(0x33) |
                        CAN_WORD0_DATA_BYTE_3(0x44);
    txFrame.dataWord1 = CAN_WORD1_DATA_BYTE_4(0x55) | CAN_WORD1_DATA_BYTE_5(0x66) | CAN_WORD1_DATA_BYTE_6(0x77) |
                        CAN_WORD1_DATA_BYTE_7(0x88);

    /* Send data through Tx Message Buffer using polling function. */
    status=FlEXCAN_TransferSendBlocking(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, &txFrame);
    PRINTF("status= %d \r\n", status);
    PRINTF("Send message from MB%d to MB%d\r\n", TX_MESSAGE_BUFFER_NUM, RX_MESSAGE_BUFFER_NUM);
    PRINTF("tx word0 = 0x%x\r\n", txFrame.dataWord0);
    PRINTF("tx word1 = 0x%x\r\n", txFrame.dataWord1);


    /* Waiting for Message receive finish. */
    while (!rxComplete)
    {
    }

    PRINTF("\r\nReceved message from MB%d\r\n", RX_MESSAGE_BUFFER_NUM);
    PRINTF("rx word0 = 0x%x\r\n", rxFrame.dataWord0);
    PRINTF("rx word1 = 0x%x\r\n", rxFrame.dataWord1);

    /* Stop FlexCAN Send & Receive. */
    FLEXCAN_DisableMbInterrupts(EXAMPLE_CAN, 1 << RX_MESSAGE_BUFFER_NUM);

    PRINTF("\r\n==FlexCAN loopback functional example -- Finish.==\r\n");

    while (1)
    {
        __WFI();
    }
}

void EXAMPLE_FLEXCAN_IRQHandler(void)
{
    /* If new data arrived. */
    if (FLEXCAN_GetMbStatusFlags(EXAMPLE_CAN, 1 << RX_MESSAGE_BUFFER_NUM))
    {
        FLEXCAN_ClearMbStatusFlags(EXAMPLE_CAN, 1 << RX_MESSAGE_BUFFER_NUM);
        FLEXCAN_ReadRxMb(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &rxFrame);
        rxComplete = true;
    }
}
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