ntg.c shows how to configure the Network Timming Generator for the M823xx device.

/*=================================================================================
*       This function set the NTG (Network Timming Generator) of the M823xx device
*       On the M823xx device this command is required if no exteral clock is provided.
=================================================================================*/
#include <vapi.h>
#include <msp.h>

VSTATUS set_ntg_config(U16 device_id)
{
        VSTATUS result;
        void *message;
        U32 response_len = DEFAULT_FIFO_MAX_SIZE;
        U8 device_response [DEFAULT_FIFO_MAX_SIZE];

        /* allocate a message to build the command */
        message = VAPI_AllocateMessage(DEFAULT_FIFO_MAX_SIZE);
        if (message == NULL)
                return -1;

        result = VAPI_SetMessage(message, CMD_CLASS_CONF_DEVICE, CMD_TYPE_CONF_CHANGE, FC_NTG_CONFIG, 2, 
                                                                        0x0001, /*Enable NTG module*/
                                                                        0x0006); /*NTG Bit Clock Generation (GPIO12) & NTG Frame Pulse Generation (GPIO11)*/
        if(result != SUCCESS)
                goto err;

        /* send the command, the response is stored in device_response*/
        result = VAPI_SendDeviceMessage(device_id, (SMsg *)message, NULL, device_response, &response_len);

err:
        VAPI_FreeMessage(message);
        return result;
}