Hi ...
I am getting the occasional error NRFX_TWI_EVT_BUS_ERROR being reported from the twi_irq_handler()
You can see in the following code snippet from this function that NRFX_TWI_EVT_BUS_ERROR will be returned if the error is not one of these
NRF_TWI_ERROR_ADDRESS_NACK
NRF_TWI_ERROR_DATA_NACK
NRF_TWI_ERROR_OVERRUN
if (p_cb->error)
{
uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(p_twi);
if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK)
{
event.type = NRFX_TWI_EVT_ADDRESS_NACK;
NRFX_LOG_DEBUG("Event: %s.", EVT_TO_STR(NRFX_TWI_EVT_ADDRESS_NACK));
SEGGER_SYSVIEW_RecordString(SYSVIEW_ICT_DEBUG_LOG_STRING, "IIC-NACK-A");
}
else if (errorsrc & NRF_TWI_ERROR_DATA_NACK)
{
event.type = NRFX_TWI_EVT_DATA_NACK;
NRFX_LOG_DEBUG("Event: %s.", EVT_TO_STR(NRFX_TWI_EVT_DATA_NACK));
SEGGER_SYSVIEW_RecordString(SYSVIEW_ICT_DEBUG_LOG_STRING, "IIC-NACK-D");
}
else if (errorsrc & NRF_TWI_ERROR_OVERRUN)
{
event.type = NRFX_TWI_EVT_OVERRUN;
NRFX_LOG_DEBUG("Event: %s.", EVT_TO_STR(NRFX_TWI_EVT_OVERRUN));
SEGGER_SYSVIEW_RecordString(SYSVIEW_ICT_DEBUG_LOG_STRING, "IIC-Ovrn");
}
else
{
event.type = NRFX_TWI_EVT_BUS_ERROR;
NRFX_LOG_DEBUG("Event: %s.", EVT_TO_STR(NRFX_TWI_EVT_BUS_ERROR));
SEGGER_SYSVIEW_RecordString(SYSVIEW_ICT_DEBUG_LOG_STRING, "IIC-BErr");
}
}
The datasheet for the nRF52820 only has 3 errors A,B,C
Does anyone know what error causes this ?
Do I need to do anything special to recover from it ?
NOTE: I have added the Segger SystemView API calls to the above code to help track the problem. They were not present in the SDK.
