How to continuos transmit data? - c

Question

Chip：C8051F321 & PCF85176(LCD Driver)
I am trying to communicate from C8051F321(MASTER) to PCF85176(SLAVE), and the original code is only transmit for one byte like this:
START → SLAVE ADDR → DATA → ACK → STOP
But I tried to make it like
START → SLAVE ADDR → Command → ACK → DATA → ACK...→ ACK ..→ ACK .. →
STOP
And it always no effect like my code
How can I correct my code?
Thanks for helping~
void SMBus_ISR (void) interrupt 7
{
bit FAIL = 0; // Used by the ISR to flag failed
// transfers
static bit ADDR_SEND = 0; // Used by the ISR to flag failed
unsigned char a; // transmissions as slave addresses
if(ARBLOST == 0)
{
switch (SMB0CN & 0xF0) // Status vector
{
// Master Transmitter/Receiver: START condition transmitted.
case SMB_MTSTA:
SMB0DAT = TARGET; // Load address of the target slave
SMB0DAT &= 0xFE; // Clear the LSB of the address for the
// R/W bit
SMB0DAT |= SMB_RW; // Load R/W bit
STA = 0; // Manually clear START bit
ADDR_SEND = 1;
break;
// Master Transmitter: Data byte
case SMB_MTDB:
if (ACK) // Slave Address or Data Byte
{ // Acknowledged?
if (ADDR_SEND)
{
ADDR_SEND = 0; // Next byte is not a slave address
if(SMB_DATA_OUT==0xF0)
{
SMB0DAT = SMB_DATA_OUT;
ADDR_SEND = 0;
}
else
{
SMB0DAT = SMB_Command_OUT;
ADDR_SEND = 1;
}
}
else // If previous byte was not a slave address,
{
STO =1; // Set STO to terminate transfer
SMB_BUSY =0; // And free SMBus interface
}
}
else
{
STO = 1; // Set STO to terminate transfer
STA = 1; // By a START
NUM_ERRORS++; // Indicate error
}
break;
//Master Receiver:byte received
case SMB_MRDB:
SMB_DATA_IN =SMB0DAT; // Store received byte
SMB_BUSY = 0; // Free SMBus interface
ACK = 0; // Send NACK to indicate last byte
// of this transfer
STO = 1; // Send STOP to terminate transfer
break;
default:
FAIL = 1; // Indicate failed transfer
// and handle at end of ISR
break;
}//end switch
}
else
{
//ARBLOST = 1,error occurred...abort transmission
FAIL = 1;
} //end ARBLOST if
if(FAIL) // If the transfer failed,
{
SMB0CF &= ~0x80; // Reset communication
SMB0CF |= 0x80;
STA = 0;
STO = 0;
ACK = 0;
SMB_BUSY = 0; // Free SMBus
FAIL = 0;
NUM_ERRORS++; // Indicate an error occurred
}
SI = 0; //Clear interrupt flag
}