UART not working after setting Tx and RX pin in default state

[ashokhirpara]

Hi,

SDK: nRF52_SDK_12.2.0

Softdevice: Generic_Stack_S332_02.00.01.hex

TX_PIN_NUMBER: on port 25

RX_PIN_NUMBER: on port 26

In our application we are using two MCU, one is nRF52832 and second MSP430F2370. UART configure to communicate with MSP430 from Nordic. To reduce power consumption deactivate UART in sleep mode.

After deactivation of UART set Tx and Rx pin to default state. ("nrf_gpio_cfg_default(TX_PIN_NUMBER);  nrf_gpio_cfg_default(RX_PIN_NUMBER);")

System wakeup on interrupt from MSP and UART will active (Re-intialize UART) and Nordic should exchange messages with MSP on UART.

We are getting issue described below:

1. On system power up print welcome messages on UART. (" UART Enabled ")  

2. some how don't know what happen but UART stop working on port pin 25-26.

3. Even not getting welcome message on power up.

4. Same firmware is working in other hardware in which we are not setting the UART Tx and Rx pin default state when de-activate the UART. 

5. Is possible that it could damage the Tx Rx pin.

Please refer the hardware connection detail attached below.

1. MSP430

2. PCB connector:

3. nRF52832

Thanks,

Nirav Patel

[johnny]

You can check this error or not~ 

case APP_UART_COMMUNICATION_ERROR:
APP_ERROR_HANDLER(p_event->data.error_communication);
break;

[ashokhirpara]

Thanks!!! Johnny,

If I exchange the UART TX(26) and RX(25) pin than transmitter of UART is working fine but not able to receive on port 25.

I able to set port pin 25 in high state and in low state but not able to use for UART communication.

-Thanks

[W9]

Were you ever able to get RX to work on P0.25 ? I think that I am seeing the same issue.

Wayne