Hi,
I am developping a non blocking TWI (I2C) communication, calling this function:
static void charger_disable_low_power_mode_not_blocking(void)
{
const uint8_t frame_lsb[] = {0x00, 0x60};
const uint8_t frame_msb[] = {0x01, 0x0E};
const uint8_t frame[3] = {0x00, 0x60, 0x0E};
// Transfer type
m_hal_drv_charger.xfer.twi_xfer.type = NRF_DRV_TWI_XFER_TX;
// Length
m_hal_drv_charger.xfer.twi_xfer.primary_length = 3;
// Copy the frame pointer
m_hal_drv_charger.xfer.twi_xfer.p_primary_buf = &frame[0];
// Add i2c xfer
result = nrf_drv_twi_xfer(&i2c_twi, &m_hal_drv_charger.xfer.twi_xfer., 0);//NRF_DRV_TWI_FLAG_NO_XFER_EVT_HANDLER
}
The init function of the twi is :
void hal_drv_charger_init_not_blocking(void)
{
ret_code_t err_code = nrf_drv_twi_init(&i2c_twi, &i2c_twi_config, twi_event_handler, NULL);//twi_event_handler
// Configures the I2C transfer to send the charger frame at the charger address
m_hal_drv_charger.xfer.twi_xfer.type = NRF_DRV_TWI_XFER_TX;
m_hal_drv_charger.xfer.twi_xfer.address = HAL_DRV_CHARGER_ADDRESS;
m_hal_drv_charger.xfer.twi_xfer.secondary_length = HAL_DRV_CHARGER_SEC_FRAME_SIZE;
m_hal_drv_charger.xfer.callback = NULL;
//Wait so the charger has correctly boot
nrf_delay_ms(CHARGER_BOOT_TIME_MS);//Empirical value, to be determined if really useful by testing/reading datasheet/
//asking forum
}
Please note that the real code is splitted in more functions, I concatenated it here for better understand, I might have forgotten something obvious, but the main point is that it works well without debugger, so I don't think the code is the issue.
The twi_event_handler is empty to be sure it doesn't create any mess.
As said, it works well in normal mode, but as soon as I go in debug mode, the maximum sent frames size is 1, even if the size is bigger (typically 3), and only sending the other ones after I run the next breakpoint that is not supposed to block the transmission at all.
