BeagleBone Black and HDMI framer TDA19988

Hi all,

I'm working on C/C++ code to get the HDMI framer working on Beaglebone Black.  As starter, I try to obtain the version information from the TDA19988 chip.  By the datasheet, the I2C address of the HDMI part is 0x70 (the CEC part uses address 0x34).  Generating a start condition on address 0x70 on I2C0 generates a NACK error...  (The I2C is working, I can read the BoardID eeprom without any problem).

	void TDA19988::hdmiRead(uint8_t reg, uint16_t length, uint8_t* pData)
	{
		uint32_t idx = 0;

		m_pI2C->MasterSlaveAddrSet(TDA19988_HDMIAddress);
		m_pI2C->MasterIntDisableEx(0xFFFFFFFF);
		m_pI2C->MasterEnable();
		while(!m_pI2C->SystemStatusGet());

	    /* First send the register offset - TX operation */
	    m_pI2C->SetDataCount(1);

	    // StatusClear();
	    m_pI2C->MasterIntClearEx(0x7FF);

	    m_pI2C->MasterControl(I2C_CFG_MST_TX);

	    m_pI2C->MasterStart();

	    /* Wait for the START to actually occur on the bus */
	    while (0 == m_pI2C->MasterBusBusy());

	    m_pI2C->MasterDataPut(reg);

	    /* Wait for the Tx register to be empty */
	    while (0 == m_pI2C->MasterIntRawStatusEx(I2C_INT_TRANSMIT_READY));

	    m_pI2C->MasterIntClearEx(I2C_INT_TRANSMIT_READY);

	    while(0 == (m_pI2C->MasterIntRawStatus() & I2C_INT_ADRR_READY_ACESS));

	    // StatusClear();
	    m_pI2C->MasterIntClearEx(0x7FF);

	    m_pI2C->SetDataCount( length);

	    /* Now that we have sent the register offset, start a RX operation*/
	    m_pI2C->MasterControl(I2C_CFG_MST_RX);

	    /* Repeated start condition */
	    m_pI2C->MasterStart();

	    while (length--)
	    {
	        while (0 == m_pI2C->MasterIntRawStatusEx(I2C_INT_RECV_READY));
	        pData[idx++] = (uint8_t)m_pI2C->MasterDataGet();
	        m_pI2C->MasterIntClearEx(I2C_INT_RECV_READY);
	    }

	    m_pI2C->MasterStop();

	    while(0 == (m_pI2C->MasterIntRawStatus() & I2C_INT_STOP_CONDITION));

	    m_pI2C->MasterIntClearEx(I2C_INT_STOP_CONDITION);
	}

The above code is in a loop @ line 27...  The I2C status indicates a NACK.

I have checked the settings for clkout1 (GPIO0_19) to make sure it's outputting clock signals to the TDA19988 :

/*	clkout1	*/
//	GPIO0_19 is clkout1 = 24MHz for HDMI Framer (divided by 2 (ic U6 on schematics))

HWREG(SOC_CONTROL_REGS + CONTROL_CONF_XDMA_EVENT_INTR(0)) =
     (3 << CONTROL_CONF_XDMA_EVENT_INTR0_CONF_XDMA_EVENT_INTR0_MMODE_SHIFT)    |
     (1 << CONTROL_CONF_XDMA_EVENT_INTR0_CONF_XDMA_EVENT_INTR0_PUDEN_SHIFT)    |
     (0 << CONTROL_CONF_XDMA_EVENT_INTR0_CONF_XDMA_EVENT_INTR0_PUTYPESEL_SHIFT)|
     (1 << CONTROL_CONF_XDMA_EVENT_INTR0_CONF_XDMA_EVENT_INTR0_RXACTIVE_SHIFT) |
     (0 << CONTROL_CONF_XDMA_EVENT_INTR0_CONF_XDMA_EVENT_INTR0_SLEWCTRL_SHIFT);

Any idea ?

Paul