/*******************************************************************************
* 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() */
/*******************************************************************************
* 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() */
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;
}