#define MAX_GPIO 8
...
...
...
bool DLPControl::GetGPIONum(int* num)
{
	const int Pin[MAX_GPIO] = {13, 14, 15, 20, 21, 24, 25, 27};

	bool enAltFunc, altFunc1, dirOutput, outTypeOpenDrain, state;

	*num = 0;
	for(int i =0; i<MAX_GPIO; i++)
	{
		if(DLPC350_GetGPIOConfig(Pin[i], &enAltFunc, &altFunc1, &dirOutput, &outTypeOpenDrain, &state)!=0)
			return false;
		if(state)
			(*num) += 1<<i;
	}
	return true;
}

int DLPC350_GetGPIOConfig(unsigned int pinNum, bool *pEnAltFunc, bool *pAltFunc1, bool *pDirOutput, bool *pOutTypeOpenDrain, bool *pState)
/**
 * (I2C: 0x44)
 * (USB: CMD2: 0x1A, CMD3: 0x38)
 *
 * This API reads back the GPIO configuration on a specific set of DLPC350 pins. The
 * command reads back their direction, output buffer type, and  state.
 *
 * @param   pinNum - I - GPIO selection. See Table 2-38 in the programmer's guide for description of available pins
 *
 * @param   *pEnAltFunc - O - 0=disable alternative function; enable GPIO; 1=enable alternative function; disable GPIO
 *
 * @param   *pAltFunc1 - O - must be set to false
 *
 * @param   *pDirOutput - O - 0=input; 1=output
 *
 * @param   *pOutTypeOpenDrain - O - 0=Standard buffer (drives high or low); 1=open drain buffer (drives low only)
 *
 * @param   *pState - O - 0=LOW; 1=HIGH
 *
 * @return  0 = PASS    <BR>
 *          -1 = FAIL  <BR>
 *
 */
{
    hidMessageStruct msg;

    DLPC350_PrepReadCmdWithParam(GPIO_CONFIG, (unsigned char)pinNum);

    if(DLPC350_Read() > 0)
    {
        memcpy(&msg, g_InputBuffer, 65);
        *pEnAltFunc = ((msg.text.data[1] & BIT7) == BIT7);
        *pAltFunc1 = ((msg.text.data[1] & BIT6) == BIT6);
        *pDirOutput = ((msg.text.data[1] & BIT5) == BIT5);
        *pOutTypeOpenDrain = ((msg.text.data[1] & BIT4) == BIT4);
        if(*pDirOutput)
            *pState = ((msg.text.data[1] & BIT3) == BIT3);
        else
            *pState = ((msg.text.data[1] & BIT2) == BIT2);
        return 0;
    }
    return -1;
}