Hello,
I'm trying to communicate with another device via I2C. I'm trying to do a simple write but it seems that the TWI NRFX driver is sending wrong data.
I'm just calling nrfx_twi_tx(&m_twi, I2C_ADDR, data, size, false); with some data, but when I get the "DONE" event, the data I see in the interrupt does not match what I wanted to send. I am checking the data in p_event->xfer_desc.p_primary_buf[i] from 0 to length - 1.
This is some debug output for reference:
APP : Writing: 01 FE
TWI : Transfer type: XFER_TX.
TWI : Transfer buffers length: primary: 2, secondary: 0.
TWI : Primary buffer data:
TWI : 01 FE |..
TWI : Secondary buffer data:
TWI : |
TWI : tx 01
TWI : Function: nrfx_twi_xfer, error code: NRF_SUCCESS.
TWI : TWI: Event: NRF_TWI_EVENT_TXDSENT.
TWI : tx 00
TWI : TWI: Event: NRF_TWI_EVENT_TXDSENT.
TWI : TWI: Event: NRF_TWI_EVENT_STOPPED.
TWI : Event: EVT_DONE.
APP : TXDONE: 00 00
I added a log just before calling nrf_twi_txd_set:
if (*p_bytes_transferred < length)
{
NRFX_LOG_INFO("tx %02X", p_data[*p_bytes_transferred]);
nrf_twi_txd_set(p_twi, p_data[*p_bytes_transferred]);
++(*p_bytes_transferred);
}
That's a code snippet from twi_send_byte in nrfx_twi.c
Why could this be happening?
Thanks for your help!
