Connecting UART Data to development board PCA10040

Question

I am trying to transfer data from a USB to serial converter board (called board A) to the nrf5 board (called board B). I made the connection over a bread board, the transmitter from board A is connected to pin 06 on board B, it is also at the same time connected to the receive in Board A. I am sending zeros and receiving zeros at board A. I want to see these zeros at board B. 
 The baud rate on both is adjusted to 19200. The ground is connected on both boards. 
 I started uart_pca10040 example but I don't get any data received on board B. I tried to connect pin 5 with 7 for CTS and DTR but also I don't see any data. 
 The data voltage on Board B is 2.1 V.

sherif · Accepted Answer

Solved: 
 Here is the solution: 
 
 1- Use pin 3 and 2 and disable the rts and cts 
 static void uart_init(void)
{
 uint32_t err_code;
 app_uart_comm_params_t const comm_params =
 {
 .rx_pin_no = 3, //RX_PIN_NUMBER,
 .tx_pin_no = 2,//TX_PIN_NUMBER,
// .rts_pin_no = 17, //RTS_PIN_NUMBER,
// .cts_pin_no = 18, //CTS_PIN_NUMBER,
 .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
 .use_parity = false,
#if defined (UART_PRESENT)
 .baud_rate = NRF_UART_BAUDRATE_115200
#else
 .baud_rate = NRF_UARTE_BAUDRATE_115200
#endif
 };

APP_UART_FIFO_INIT(&comm_params,
 UART_RX_BUF_SIZE,
 UART_TX_BUF_SIZE,
 uart_event_handle,
 APP_IRQ_PRIORITY_LOWEST,
 err_code);
 APP_ERROR_CHECK(err_code);
}
 
 2- don't connect any leds because it seems that drawing any amount of rel. current will disable the data transfer 
 3- connect board A (serial to usb) to board B (PCA10040) 
 Gnd-Gnx 
 Rx (board A) - Pin 2 (Board B) 
 Tx (board A) - Pin3 (Board B) 
 
 4- Install the mac usbto serial port driver (or use Serial app because it has internal drivers but cost 25$) 
 My driver was based on this link 
 https://blog.sengotta.net/signed-mac-os-driver-for-winchiphead-ch340-serial-bridge/ 
 5- Using cool Term connect to your usb-serial port 
 6- using segger 
 in my main loop i sent 1 and 255 for testing 
 for (;;)
 {
 idle_state_handle();
 uint32_t err_code = app_uart_put(1);
 if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
 {
 NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
 APP_ERROR_CHECK(err_code);
 }
 else
 {
 NRF_LOG_ERROR("received data");
 }
 
 } 7- if you connection is correct, you should see the 1 (byte sent) in cool term

Connecting UART Data to development board PCA10040

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