Hi,
I am using the non blocking TWI on the nrf 52840 with the following code:
void hal_drv_charger_set_current_768mA(void)
{
uint8_t frame[5] = {0x0F, 0xF0, 0x0F, 0xF0, 0x0F};
// 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 = 5;
// Copy the frame pointer
m_hal_drv_charger.xfer.twi_xfer.p_primary_buf = &frame[0];
//nrf_delay_ms(100);
// Add i2c xfer
hal_drv_pwr_i2c_add_xfer(&m_hal_drv_charger.xfer);
}
The xfer is handled like this:
static void launch_xfer_state(void) {
NRF_LOG_INFO("Launch xfer");
//We are not in wait xfer state
if(m_hal_drv_pwr_i2c.state != WAIT_XFER_PWR_I2C_ST)
{
// If the XFER queue contains XFERs
if (!nrf_queue_is_empty(&pwr_i2c_xfer_queue))
{
// Get the XFER from the XFER queue
if(nrf_queue_pop(&pwr_i2c_xfer_queue, &m_hal_drv_pwr_i2c.xfer) == NRF_SUCCESS)
{
if (m_hal_drv_pwr_i2c.xfer.twi_xfer.type == NRF_DRV_TWI_XFER_TXRX)
{
//Catch the return data pointer
preturn = m_hal_drv_pwr_i2c.xfer.twi_xfer.p_secondary_buf;
}
// Performs the XFER call on the PWR_I2C TWI instance
memcpy(sent_buff, m_hal_drv_pwr_i2c.xfer.twi_xfer.p_primary_buf, 5);
xfer_desc = m_hal_drv_pwr_i2c.xfer.twi_xfer;
primary_length = m_hal_drv_pwr_i2c.xfer.twi_xfer.primary_length;
//m_hal_drv_pwr_i2c.xfer.twi_xfer.primary_length = 4;
NRF_LOG_INFO("First byte sent is : %d", sent_buff[0]);
NRF_LOG_INFO("Second byte sent is : %d", sent_buff[1]);
NRF_LOG_INFO("Third byte sent is : %d", sent_buff[2]);
NRF_LOG_INFO("4 byte sent is : %d", sent_buff[3]);
NRF_LOG_INFO("5 byte sent is : %d", sent_buff[4]);
NRF_LOG_INFO("Frame length is : %d", primary_length);
// Performs the XFER call on the PWR_I2C TWI instance
result = nrf_drv_twi_xfer(&i2c_twi, &m_hal_drv_pwr_i2c.xfer.twi_xfer, 0);//NRF_DRV_TWI_FLAG_NO_XFER_EVT_HANDLER
m_hal_drv_pwr_i2c.state = WAIT_XFER_PWR_I2C_ST;
run_xfer_fsm();
}
else
{
//error handler if you can't get the XFER from the XFER queue
}
}
else //If the XFER queue is empty
{
// Goes to IDLE state
m_hal_drv_pwr_i2c.state = IDLE_PWR_I2C_ST;
run_xfer_fsm();
}
}
else //We are in wait state
{
//Do nothing
}
}
TWI config is
static void init_state(void) {
// On state transition
if (m_hal_drv_pwr_i2c.state != m_hal_drv_pwr_i2c.prev_state) {
// Set the entry phase done
m_hal_drv_pwr_i2c.prev_state = m_hal_drv_pwr_i2c.state;
// Initialize the TWI driver
ret_code_t err_code = nrf_drv_twi_init(&i2c_twi, &i2c_twi_config, twi_event_handler, NULL);//twi_event_handler
//herat
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&i2c_twi);
// Reset the XFER queue
nrf_queue_reset(&pwr_i2c_xfer_queue);
// Goes to IDLE state
m_hal_drv_pwr_i2c.state = IDLE_PWR_I2C_ST;
}
}
and
static nrf_drv_twi_config_t i2c_twi_config =
{
.frequency = (nrf_drv_twi_frequency_t)NRF_DRV_TWI_FREQ_100K,
.scl = SCL_PWR_PIN,
.sda = SDA_PWR_PIN,
.interrupt_priority = TWI_DEFAULT_CONFIG_IRQ_PRIORITY,
.clear_bus_init = TWI_DEFAULT_CONFIG_CLR_BUS_INIT,
.hold_bus_uninit = TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT,
};
The twi_event_handler is empty.
Here is what I see on RTT:
The result on oscilloscope is good for the first byte, but then its only 0 ..: (slave address is 0x6A):
Thanks
