CC2340R5: How to toggle BT peripheral mode

Hello Zach,

Thanks for reaching out.

Could you please point out how (where in the code) are you calling the BLEAppUtil_advStart() and BLEAppUtil_advStop() functions?

For example, this is how it is being used inside the app_peripheral.c in Peripheral_GAPConnEventHandler() to enable advertising until the amount of new formed connections has been reached.

oid Peripheral_GAPConnEventHandler(uint32 event, BLEAppUtil_msgHdr_t *pMsgData)
{
    switch(event)
    {
        case BLEAPPUTIL_LINK_ESTABLISHED_EVENT:
        {
            /* Check if we reach the maximum allowed number of connections */
            if(linkDB_NumActive() < linkDB_NumConns())
            {
                /* Start advertising since there is room for more connections */
                BLEAppUtil_advStart(peripheralAdvHandle_1, &advSetStartParamsSet_1);
            }
            else
            {
                /* Stop advertising since there is no room for more connections */
                BLEAppUtil_advStop(peripheralAdvHandle_1);
            }
            break;
        }

BR,

David.

bStatus_t toggle_bt_peripheral(int on) {
    if (on && !is_bt_peripheral_enable) {  // When peripheral mode is disabled
        return BLEAppUtil_advStart(peripheralAdvHandle_1, &advSetStartParamsSet_1);
    } else if (!on && is_bt_peripheral_enable) {  // When peripheral mode is enabled
        return BLEAppUtil_advStop(peripheralAdvHandle_1);
    }
    return SUCCESS;
}

bStatus_t toggle_bt_peripheral(int on) {
    if (on && !is_bt_peripheral_enable) {  // When peripheral mode is disabled
        return BLEAppUtil_advStart(peripheralAdvHandle_1, &advSetStartParamsSet_1);
    } else if (!on && is_bt_peripheral_enable) {  // When peripheral mode is enabled
        return BLEAppUtil_advStop(peripheralAdvHandle_1);
    }
    return SUCCESS;
}

Hello Zach,

Understood.

Where/How are you calling the toggle_bt_peripheral() function? Is it inside the UART callback function?

Based on your next answer, I would suggest using BLEAppUtil_invokeFunctionNoData() to invoke the toggling function. This function receives a callback and data and switches the context in order to call the callback from the BLE App Util module context.

BR,

David.

Hi David,

    First, we create a thread to read data from the UART:

void UART_read_task(void)
{
    bStatus_t status_read  = UART2_STATUS_SUCCESS;
    bStatus_t status_write = UART2_STATUS_SUCCESS;
    bStatus_t status_send  = UART2_STATUS_SUCCESS;
    uint16 buffer_len   = 128;
    // size_t bytesRead;
    size_t bytesWrite;
    // int8 ret            = 0;
    struct ble_pdu *pdu;
    char success[]      = "SUCCESS: Sent data to App";
    char error[]        = "ERROR: Failed to send data to App!!";
    char *buf;
    int retry_count     = 0;
    if (wnc_uart_init() < 0) {
        WNC_DBG("UART INIT failed");
        return;
    }

    while (1) {
        pdu = (struct ble_pdu *) malloc(sizeof(struct ble_pdu));
        if (pdu == NULL) {
            WNC_DBG("malloc failed");
            retry_count++;
            if ( retry_count > 10 ) {
                WNC_DBG("HW RESET......");
                SystemReset();
            }
            continue;
        }
retry:
        memset(pdu, 0, sizeof(struct ble_pdu));

        if (UART2_read(uartHandle, pdu->buf, sizeof(pdu->buf), &(pdu->len)) != UART2_STATUS_SUCCESS) {
            WNC_DBG("UART2_read() failed: status_read:%d, bytesRead: %d", status_read, pdu->len);
            goto retry;
        }

        if ( (pdu->buf[0] == 'O') || (pdu->buf[0] == 'C') ) {
            if ( pdu->buf[7] == 0x00 && ble_cmd(pdu->buf) == 0) {
                    goto retry;
            }
        }
        else if (pdu->buf[0] == 'S' && pdu->buf[1] == 'T')
        {
            /* Got "Stop!" to terminate heater control
             * send something like below in sdx62 adb shell
             * printf "\x53\x54\x4F\x50\x00" > /dev/ttyMSM1
             */
            Terminate_heat_control();
        }
        else if (pdu->buf[0] == 'F' && pdu->buf[1] == 'O')
        {
            // Close watchdog
            Watchdog_close(watchdogHandle);
            WNC_DBG("Turn Off HW watchdog !");
            GPIO_write(CONFIG_GPIO_HEATER, 0);
            WNC_DBG("Turn Off Heater !");
        }
        else if (pdu->buf[0] == 'B' && pdu->buf[1] == 'T')
        {
            parsing_bt_cmd(pdu->buf);

            goto retry;
        }

        /* If you want to send temperature to CC2340 manually */
#ifdef SEND_TEMPERATURE
        else if ( pdu->buf[0] == 'T' && pdu->buf[1] == 'E' ) {
            temperature_tmp = atoi(pdu->buf + 2);
        }
        /*
         * send something like below in sdx62 adb shell
         * e.g. "TE-25" means -25 degree C
         * printf "\x54\x45\x2D\x32\x35\x00" > /dev/ttyMSM1
         */
#endif

        else if ( pdu->buf[0] == 'I' && pdu->buf[1] == 'D' ) {
//            printf "\x49\x44\x00" > /dev/ttyMSM1
//            SendIDtoSDX62();
            char BTID[10];
            memcpy(BTID, advSetInitParamsSet_1.scanRespData + 2, 10 * sizeof(char));
            WNC_DBG("BTID : %d", sizeof(*BTID));

            UART2_write(uartHandle, BTID, sizeof(BTID), &bytesWrite);
        }

        BLEAppUtil_invokeFunction((InvokeFromBLEAppUtilContext_t)SendUARTOverBLE, (char*)pdu);
    }
}

When the data matches our built-in commands, it triggers the related behavior. In the context of this issue, toggle_bt_peripheral() will be invoked.

By the way, should I use BLEAppUtil_invokeFunction() instead of BLEAppUtil_invokeFunctionNoData() ?

Since the function takes one argument.

Thanks,

Zach

Hi David,

Update information:

Below is a pseudo code :

static int set_bt_rf_status(int flag) {

    int status = 0;
    int tmp;

#if defined( HOST_CONFIG ) && ( HOST_CONFIG & ( PERIPHERAL_CFG ) )
    tmp = flag & 0x4;
    if ((status = BLEAppUtil_invokeFunction((InvokeFromBLEAppUtilContext_t)toggle_bt_peripheral, (char*)&tmp)) != SUCCESS) {
        return status;
    }
#endif

    return status;
}

Is my understanding correct?

Thanks,

Zach

Hello Zach,

If your variable is a global one, then you can use the BLEAppUtil_invokeFunctionNoData().

After trying this (not sure if it is the first or second code-snippet), do you still get the error?

BR,

David.

Hi David,

    Thanks for your response. The problem has been solved, but I'm also curious about the mechanism behind it.

Can you explain why this solution works or where can I find related documentation regarding the TI BLE Stack?

Many thanks,

Zach

Hello Zach,

Sure thing. This function changes the context in order to call the callback function (toggle_bt_peripheral in your case) from the BLE App Util module context where you can actually use BLEAppUtil_advStart() and BLEAppUtil_advStop() functions.

Hope this helps.

David.