CC3220SF-LAUNCHXL: UART2_read或UART2_readTimeout都收不到UART2_STATUS_ECANCELLED

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/*
 *  ======== mailbox.c ========
 */

/* XDC module Headers */
#include <xdc/std.h>
#include <xdc/runtime/System.h>

/* BIOS module Headers */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Mailbox.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/drivers/Board.h>
#include <ti/drivers/Uart2.h>
#include "ti_drivers_config.h"
#define NUMMSGS         5
#define TASKSTACKSIZE   512

/*
 * This type is accessed by the application. When changing the data members of
 * this structure, considerations should be made for padding and data alignment.
 */
typedef struct MsgObj {
    Int     id;
    Char    val;
} MsgObj;

/*
 * Mailbox messages are stored in a queue that requires a header in front of
 * each message. Mailbox_MbxElem is defined such that the header and its size
 * are factored into the total data size requirement for a mailbox instance.
 * Because Mailbox_MbxElem contains Int data types, padding may be added to
 * this struct depending on the data members defined in MsgObj.
 */
typedef struct MailboxMsgObj {
    Mailbox_MbxElem  elem;      /* Mailbox header        */
    MsgObj           obj;       /* Application's mailbox */
} MailboxMsgObj;

/* This buffer is not directly accessed by the application */
MailboxMsgObj mailboxBuffer[NUMMSGS];

Mailbox_Struct mbxStruct;
Mailbox_Handle mbxHandle;

Task_Struct task0Struct, task1Struct;
Char task0Stack[TASKSTACKSIZE], task1Stack[TASKSTACKSIZE];

Void readerTask(UArg arg0, UArg arg1);
Void writerTask(UArg arg0, UArg arg1);
UART2_Handle UartHandle;
void uart2_init(void)
{
    UART2_Params uartParams;
    // 确保调用UART_Params_init之前有调UART_init
    UART2_Params_init(&uartParams);
    uartParams.readMode = UART2_Mode_BLOCKING;  // 回调模式
    uartParams.writeMode = UART2_Mode_BLOCKING; // 写模式使用回调模式
    uartParams.readCallback = NULL;             // 回调函数
    uartParams.writeCallback = NULL;            // 回调函数
    uartParams.readReturnMode = UART2_ReadReturnMode_FULL;
    uartParams.baudRate = 2000000;             // 波特率
    uartParams.dataLength = UART2_DataLen_8;   // 数据长度为8位
    uartParams.stopBits = UART2_StopBits_1;    // 1位停止位
    uartParams.parityType = UART2_Parity_NONE; // 奇偶校验位
    // 到时候这里使用为UART调试口的初始化
    UartHandle = UART2_open(CONFIG_UART2_0, &uartParams);

    /* remove uart receive from LPDS dependency */
    // UART2_control(app_CB.paramUartHandle, UART_CMD_RXDISABLE, NULL);
}
/*
 *  ======== main ========
 */
int main()
{
    Task_Params taskParams;
    Mailbox_Params mbxParams;

    /* Call Driver init functions */
    Board_init();
    uart2_init();
    /* Construct read and writer tasks */
    Task_Params_init(&taskParams);
    taskParams.stackSize = TASKSTACKSIZE;
    taskParams.stack = &task0Stack;
    Task_construct(&task0Struct, (Task_FuncPtr)writerTask, &taskParams, NULL);
    taskParams.stack = &task1Stack;
    Task_construct(&task1Struct, (Task_FuncPtr)readerTask, &taskParams, NULL);

    /* Construct a Mailbox instance */
    Mailbox_Params_init(&mbxParams);
    mbxParams.buf = (Ptr)mailboxBuffer;
    mbxParams.bufSize = sizeof(mailboxBuffer);
    Mailbox_construct(&mbxStruct, sizeof(MsgObj), NUMMSGS, &mbxParams, NULL);
    mbxHandle = Mailbox_handle(&mbxStruct);

    BIOS_start();

    return(0);
}


/*
 *  ======== readerTask ========
 */
Void readerTask(UArg arg0, UArg arg1)
{
    size_t bytesRead = 0;
    char   input[16];
    while (1) {
        System_printf("UART2_read Enter\n");
        System_flush();
        int status = UART2_read(UartHandle, &input, 16, &bytesRead);
        System_printf("UART2_read return:%d,bytesRead:%d\n",status,bytesRead);
        System_flush();
    }
    System_printf("All messages received. Exiting...\n");

    BIOS_exit(0);
}

/*
 *  ======== writerTask ========
 */
Void writerTask(UArg arg0, UArg arg1)
{

    while (1) {
        System_printf("UART2_readCancel Enter\n");
        System_flush();
        UART2_readCancel(UartHandle);
        System_printf("UART2_readCancel return\n");
        System_flush();
        Task_sleep((10000 / Clock_tickPeriod)*100);
       }

}

上面的代码是在mailbox工程，修改mailbox.c文件来测试，运行结果如下，UART2_read没有被cancel 

运行结果：

UART2_readCancel Enter
UART2_readCancel return
UART2_read Enter
UART2_readCancel Enter
UART2_readCancel return
UART2_readCancel Enter
UART2_readCancel return

除非uartParams.readReturnMode = UART2_ReadReturnMode_PARTIAL，但UART2_read反回的是UART2_STATUS_SUCCESS，不是UART2_STATUS_ECANCELLED

运行结果：

UART2_readCancel Enter
UART2_readCancel return
UART2_read Enter
UART2_readCancel Enter
UART2_readCancel return
UART2_read return:0,bytesRead:0
UART2_read Enter
UART2_readCancel Enter
UART2_readCancel return
UART2_read return:0,bytesRead:0