52840 port pin P1.00 can not use as the uart pin.

[sdssds]

Hi, my sdk version is 17.0.2, softdevice is s140, when i use the port pin P1.00 as the RX pin of the uart, it will show data bus error, i have tried use other pin as the RX, it can be inited and work well. Do i need to do some settings to let this pin work?

[awneil]

Perhaps show what you actually did ?

sdssds said:

it will show data bus error

You mean you get a Hard Fault?

sdssds said:

other pin as the RX, it can be inited and work well

Did you try any other pins on P1 - or just P0 ... ?

[sdssds]

PIN define:

#define BC32_RX_PIN_NUMBER (NRF_GPIO_PIN_MAP(1,0))
#define BC32_TX_PIN_NUMBER 24
#define BC32_CTS_PIN_NUMBER 7
#define BC32_RTS_PIN_NUMBER 5

UART init:

static void BC32_uart_init(void)
{
uint32_t err_code;


const app_uart_comm_params_t comm_params =
{
BC32_RX_PIN_NUMBER,
BC32_TX_PIN_NUMBER,
BC32_RTS_PIN_NUMBER,
BC32_CTS_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED,
false,
NRF_UART_BAUDRATE_9600
};
APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_error_handle,
APP_IRQ_PRIORITY_HIGH,
err_code);

APP_ERROR_CHECK(err_code);
}

it will enter interupt handle with APP_UART_COMMUNICATION_ERROR event.

I use other pin on p1, it can work.

[awneil]

What board are you using? Are you sure there's nothing else on that pin?

sdssds said:

it will enter interupt handle with APP_UART_COMMUNICATION_ERROR event

You mean the Hard Fault handler?

When & where, exactly, does that error occur?

It could be just that you receive an initial "junk" byte, which causes a Framing Error - that really shouldn't be handled as a Fatal Error:

devzone.nordicsemi.com/.../160765

devzone.nordicsemi.com/.../161677