Function myAnalogRead

wiringPi/mcp3422.c:69–106

 */

int myAnalogRead (struct wiringPiNodeStruct *node, int chan)
{
  unsigned char config ;
  unsigned char buffer [4] ;
  int value = 0 ;
  int realChan = (chan & 3) - node->pinBase ;

// One-shot mode, trigger plus the other configs.

  config = 0x80 | (realChan << 5) | (node->data0 << 2) | (node->data1) ;
  
  wiringPiI2CWrite (node->fd, config) ;

  switch (node->data0)	// Sample rate
  {
    case MCP3422_SR_3_75:			// 18 bits
      waitForConversion (node->fd, &buffer [0], 4) ;
      value = ((buffer [0] & 3) << 16) | (buffer [1] << 8) | buffer [2] ;
      break ;

    case MCP3422_SR_15:				// 16 bits
      waitForConversion (node->fd, buffer, 3) ;
      value = (buffer [0] << 8) | buffer [1] ;
      break ;

    case MCP3422_SR_60:				// 14 bits
      waitForConversion (node->fd, buffer, 3) ;
      value = ((buffer [0] & 0x3F) << 8) | buffer [1] ;
      break ;

    case MCP3422_SR_240:			// 12 bits - default
      waitForConversion (node->fd, buffer, 3) ;
      value = ((buffer [0] & 0x0F) << 8) | buffer [1] ;
      break ;
  }

  return value ;
}


/*