Whether TWIM supports sending zero byte data?

[Eugene]

Dear Nordic,

  I want to scan slave devices , so I use TWIM nrfx driver to send zero byte data, I don't got error code, but I don't receive TWIM event too. I found a example using `

nrfx_twim_rx` to scan slaves, I was just wondering if I can't use `nrfx_twim_tx` to scan slave devices by send zero byte data?

uint8_t HAL_I2C_End_Transmission(HAL_I2C_Interface i2c, uint8_t stop,void* reserved)
{
    HAL_I2C_Acquire(i2c, NULL);

    uint32_t err_code;
    // FIXME: workaround, not support send zero byte data, 
    // scan slave device by resquestting 1 bytes from slave
    if (m_i2c_map[i2c].tx_buf_length)
    {
        m_i2c_map[i2c].transmitting = true;
        err_code = nrfx_twim_tx(m_i2c_map[i2c].instance, m_i2c_map[i2c].address, m_i2c_map[i2c].tx_buf, 
                                        m_i2c_map[i2c].tx_buf_length, !stop);
        if (err_code)
        {
            m_i2c_map[i2c].transmitting = false;
        }

        while (m_i2c_map[i2c].transmitting);

        m_i2c_map[i2c].tx_buf_index = 0;
        m_i2c_map[i2c].tx_buf_length = 0;
    }
    else
    {
        uint8_t dummy = 0;

        m_i2c_map[i2c].transmitting = true;
        err_code = nrfx_twim_rx(m_i2c_map[i2c].instance, m_i2c_map[i2c].address, &dummy, 1);
        if (err_code)
        {
            m_i2c_map[i2c].transmitting = false;
        }

        while (m_i2c_map[i2c].transmitting);
    }

    HAL_I2C_Release(i2c, NULL);
    return 0;
}

Best Regards,

Eugene

[Stian Røed Hafskjold]

Duplicate: case id 210915

[Saxman58]

I have the same problem.  Sending or reading zero bytes just to get the ACK/NACK will never return and SCL pulls low forever.  How do I find the referenced case 210915?  There is no link and searching by ID doesn't seem to work.

[Stian Røed Hafskjold]

devzone.nordicsemi.com/.../twim-clock-pin-is-pull-low-after-sending-zero-bytes-data