ble_app_hrs_c UART problem

[Mike]

I successfully run "ble_app_hrs_c" on BLE_Central example at 38,400bps on the PCA10001 device. My modification on PCA10001 board as follows;

1. cut out 32.768KHz X-tal connection to nRF51822 as I configue Internal-RC OSC for working

2. Internal RC setup as follow in function of static void ble_stack_init(void)

    NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
   // Initialize the SoftDevice handler module.
   SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_8000MS_CALIBRATION, NULL);
   //    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL);
   

3. Download S120 and this example code to flash then it successfully reply UART port.

I designed my own board using nRF51822QFAA-version H0(latest one)

1. This board also does not have 32.768KHz X-tal(using Internal-OSC)
2. I only connect nRF51822 UART_TX and UART_RX pins to my MCU
3. I tested other applications such as Radio examples and it works properly
4. I also tested my own programmed ESB scan application using UART and it also work.
5. When I download S120 and ble_app_hrs_c to my own board, UART does not work.

This is my problem, what's wrong?

[RK]

well the ble_hrs app uses UART flow control, so if you haven't modified it and haven't connected anything apart from RX and TX then that may be a good reason it doesn't work.