Ejemplo n.º 1
0
/*******************************************************************************
* Function Name  : i2c_Send_Frame
* Description    : It sends I2C frame 
* Input          : DeviceAddress is the destination device address
*                  pBUffer is the buffer data
*                  NoOfBytes is the number of bytes
* Output         : None
* Return         : status
*******************************************************************************/
static int8u i2c_Send_Frame (int8u DeviceAddress, int8u *pBuffer, int8u NoOfBytes)
{
  int8u i, data;

  SC2_TWICTRL1 |= SC_TWISTART;   // send start
  WAIT_CMD_FIN();
  
  SEND_BYTE(DeviceAddress);   // send the address low byte
  WAIT_TX_FIN();
  
   // loop sending the data
  for (i=0; i<NoOfBytes; i++) {
    halInternalResetWatchDog();
    
    data = *(pBuffer+i);
        
    SEND_BYTE(data);
    
    WAIT_TX_FIN();
  }

  SC2_TWICTRL1 |= SC_TWISTOP;
  WAIT_CMD_FIN();
  
  return SUCCESS;
}/* end i2c_Send_Frame() */
Ejemplo n.º 2
0
/*******************************************************************************
* Function Name  : i2c_Receive_Frame
* Description    : It receives an I2C frame and stores it in pBUffer parameter
* Input          : slave_addr is the slave address
*                  reg_addr is the register address
*                  NoOfBytes is the numenr of bytes to read starting from reg_addr
* Output         : buffer
* Return         : status
*******************************************************************************/
static int8u i2c_Receive_Frame (int8u slave_addr, int8u reg_addr, int8u *pBuffer, int8u NoOfBytes)
{
  int8u i, addr = reg_addr;
  
  if (NoOfBytes > 1)
    addr += REPETIR;
  
  SC2_TWICTRL1 |= SC_TWISTART;   // send start
  WAIT_CMD_FIN();
   
  SEND_BYTE(slave_addr | 0x00);      // send the address low byte
  WAIT_TX_FIN();
  
  SEND_BYTE(addr);
  WAIT_TX_FIN();

  SC2_TWICTRL1 |= SC_TWISTART;     // send start
  WAIT_CMD_FIN();
  
  SEND_BYTE(slave_addr | 0x01);      // send the address low byte
  WAIT_TX_FIN();
 
  // loop receiving the data
  for (i=0;i<NoOfBytes;i++){
    halInternalResetWatchDog();

    if (i < (NoOfBytes - 1))
      SC2_TWICTRL2 |= SC_TWIACK;   // ack on receipt of data
    else
      SC2_TWICTRL2 &= ~SC_TWIACK;  // don't ack if last one

    SC2_TWICTRL1 |= SC_TWIRECV;    // set to receive
    WAIT_RX_FIN();
    *(pBuffer+i) = SC2_DATA;       // receive data
  }

  SC2_TWICTRL1 |= SC_TWISTOP;      // send STOP
  WAIT_CMD_FIN();  

  return SUCCESS;
}/* end i2c_Receive_Frame() */
Ejemplo n.º 3
0
ssize_t frame_send(FILE *out, void *data, size_t nbytes)
{
	char *d;
	char *end;
	uint16_t crc = FRAME_CRC_INIT;

	fputc(FRAME_START, out);
	for(d = data, end = d + nbytes; d < end; d++) {
		char c = *d;
		crc = crc_ccitt_update(crc, c);
		SEND_BYTE(out, c);
	}

	crc = htons(crc);

	SEND_BYTE(out, crc >> 8);
	SEND_BYTE(out, crc & 0xff);

	fputc(FRAME_START, out);

	fflush(out);
	return nbytes;
}