CC2340R5: CC2340R5: UART read not working.

Rushikesh Aidale

Part Number: CC2340R5

Hello,

I'm using CC2340R5 simplelink_lowpower_f3_sdk_7_40_00_64 example code basic_ble.

I'm making connection with Apk using peripheral mode. Whenever Apk sends any request to BLE, on that request I need to respond by writing the same request to my controller which is connected to BLE's UART.

Controller then sends a response to the same request.

Currently, I'm able to send the request to controller through UART_2, but I'm not able to read the response sent on the UART_2.

Below is my code of UART configurations:

1)This is the thread I've created where UART initializes. (I took the reference from example code uart2callback given in resource explorer.)

void mainThread()
{
    char input;
    const char echoPrompt[] = "Echoing characters:\r\n";
    UART2_Params uartParams;
    int32_t semStatus;
    uint32_t status = UART2_STATUS_SUCCESS;
    uint8_t tempbuf[64] = {0};

    /* Create semaphore */
 //   semStatus = sem_init(&sem, 0, 0);

//    if (semStatus != 0)
//    {
//        /* Error creating semaphore */
//        // while (1) {}
//    }

    /* Create a UART in CALLBACK read mode */
    UART2_Params_init(&uartParams);
    uartParams.readMode     = UART2_Mode_CALLBACK;
    uartParams.readCallback = callbackFxn;
    uartParams.baudRate     = 115200;

    uart_handle = UART2_open(CONFIG_DISPLAY_UART, &uartParams);
}

2)This is the callback function. Doing nothing here.

void callbackFxn(UART2_Handle handle, void *buffer, size_t count, void *userArg, int_fast16_t status)
{
    if (status != UART2_STATUS_SUCCESS)
    {
        /* RX error occured in UART2_read() */
       // while (1) {}
    }

    numBytesRead = count;
   // sem_post(&sem);
}

3)uart_handle is taken global. Calling these two functions where I get the request from apk.

        UART2_write(uart_handle, newValue, len, NULL);
        UART2_read(uart_handle, newValue, sizeof(newValue), NULL);

Here, uart write works properly. I get the exact data on UART but when reading I'm not getting any data.

I've disabled the function Menu_start();

Am I missing something here?

Regards,

Rushikesh.

over 2 years ago

0 Tanguy Baltazart over 2 years ago

TI__Intellectual 2880 points

Hi Rushikesh,

Thank you for reaching the support,

Several points reach my attention, I see your main thread is terminating could you try adding an infinite loop with a delay?

Additionally, the operation mode of UART is callback but you're not using the callback function, I would suggest trying the blocking mode or the non-blocking mode please find more information in the uart2 driver UART2.h File Reference (ti.com)

I hope this help,

Tanguy

0 Rushikesh Aidale over 2 years ago in reply to Tanguy Baltazart

Prodigy 195 points

Hello Tanguy,

Thanks for your suggestions.

Made below changes as per you suggested and it worked!

1)I've set the UART operation mode to UART2_Mode_BLOCKING.

uartParams.readMode = UART2_Mode_BLOCKING;

2)Additionally, I'm calling the mainthread(); whenever there will be a request from Apk on the characteristic attribute.

And closing UART after reading the data into the buffer.

        mainThread();
        len = strlen(newValue);

        /* Pass NULL for bytesWritten since it's not used in this example */
        UART2_write(uart_handle, newValue, len, NULL);
        memset(newValue,0,sizeof(newValue));
        status = UART2_read(uart_handle, newValue, sizeof(newValue), NULL);

        UART2_close(uart_handle);

Suggest me if there's anything I can modify or optimize into the code.

Regards,

Rushikesh.

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CC2340R5: CC2340R5: UART read not working.