TWI don't work when BLE is running?

[zzzh]

Hi,

I'm using nrf52-pca10040 and sdk-15.3,  I tested an eeprom chip following twi_scanner example, using no block nrf_drv_twi_xfer way, which works well, then I put it in ble_app_uart  example with S112, neither ble nor eeprom can work.

I also tried the scheduler way, looks same.

Any ideas?

[zzzh]

I put it in debug mode and found something.

ERROR 4 [NRF_ERROR_NO_MEM] at

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

I do use 260 bytes in global ram space as read and write buffer,  if this is the reason, where should I change to afford them?

Another question, I only used NRF_LOG_INFO in eeprom program, and the LOG backtend is RTT, not UART, why UART is complaining?

[Kenneth]

Seems you have included UART somewhere in your project, looks like the error here is:
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/uarte.html#register.ERRORSRC

FRAMING error, typically because you have enabled UART RX, and the pin is floating, e.g. not pulled high. You can pull it high using an external pull-up resistor if it's not in use. 

[zzzh]

Thank you, Kenneth.

FRAMING error make sense, but why it says ERROR 4 [NRF_ERROR_NO_MEM]? is this a bug?

[Kenneth]

I can't see from your code which api return NRF_ERROR_NO_MEM?

It may be because NRF_ERROR_NO_MEM by accident have the same numeric value (4) as FRAMING error:
#define NRF_ERROR_NO_MEM                      (NRF_ERROR_BASE_NUM + 4)  ///< No Memory for operation

Kenneth

[zzzh]

It's from uart_event_handle, which is the EVT_HANDLER in APP_UART_FIFO_INIT.

It would pass this issue if I put serial cable on, to make it easier, I commented uart_init and printf to make it easier, though there's another issue..