Configuration UARTE with nrf52805 for ESB - Part 2

[Ilary]

My previous ticket is closed. I would need, but still help with the configuration of the pins. I report my last post.

Hello,
I did some tests with the oscilloscope directly connected to pins 21 and 18 of the nrf52805.
The transmission on pin 18 by the Stm8l works perfectly. The problem I encounter now is that nrf52805 I have the pull up instruction on this pin

 nrf_gpio_cfg_input(PIN_RXD,GPIO_PIN_CNF_PULL_Pullup);

but nothing happens when oscilloscopes.

It could be that I get the pin definition wrong initially

 #define UARTE_BASE           0x40002000
  #define PORTA_UARTE          ((NRF_UARTE_Type *) UARTE_BASE )
  #define PIN_TXD            21
  #define PIN_RXD            18

or the pull up configuration of pin 18, set as input and pin 21 as output?

 nrf_gpio_cfg_input(PIN_RXD,GPIO_PIN_CNF_PULL_Pullup);
     nrf_gpio_cfg_output(PIN_TXD);

[Sigurd]

Ilary said:

3. value is always APP_UART_COMMUNICATION_ERROR

APP_UART_COMMUNICATION_ERROR is the event, but there is a value found in p_event->data.error_communication aswell, you should debug and check this value when you get the APP_UART_COMMUNICATION_ERROR event.

Also, when do you get APP_UART_COMMUNICATION_ERROR? How many bytes did you receive before the error?