void send_byte(unsigned char date)
{
unsigned char i, temp;
temp = date;
for(i = 0; i < 8; i ++)
{
if(temp&0x80)
{
sda = 1;
}
else
{
sda = 0;
}
_nop_();
scl = 1;
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
scl = 0;
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
temp <<= 1;
}
checkACK();
}
/**
* Send command to the slave and delay extra 10 instruction cycles at the end
*
* Examples of command
* Write for sending data to the slave and the slave will perform flash erase and write
* Read for reading the desired segment from the slave
* ID for reading the device ID of the slave
* CONFIG for sending configuration data to the slave
*
* Input : command is the instruction for the slave
*
* Output : 1 for OK
* 0 for failure as the master did not receive ACK from the slave
*
*/
uint8 spiSendCommand(uint8 command)
{
uint8 acknack,dummy;
spiConfigureMaster();
spiSendByte(command);
acknack = ReadSPI();
if(!checkACK(&acknack))
return 0 ; //return 0 for error
CloseSPI();
Delay10TCYx(1);
return 1 ;
}
//------------------------------------------------------
int wait_ack(int ackNo){
int status;
do{
status = inportb(LSR) & 0x01;
if(getTimer()==0){ // TIME OUT -> Send new frame
printf("TIME-OUT\n");
return 1; // Not receive ACK
}
}while (status!=0x01);
//Repeat until get Something
if(!checkACK(inportb(TXDATA),ackNo)){
return 1; // Fail to receive ACK
}
return 0; // Receive ACK & Send Complete
}
/**
* Send any amount of data through spi and always check for the slave ACK
* Delay extra 10 instruction cycles at the end of sending.
*
* Input : *data is the pointer to the data array
* count is the amount of data in the array
* startPoint is the starting location of the data array to access
*
*/
uint8 spiSendData(uint8 *data,uint8 count,uint8 startPoint)
{
uint8 acknack , i , j = startPoint;
spiConfigureMaster();
for ( i = 0 ; i < count ; i ++ )
{
spiSendByte(data[j]);
acknack = ReadSPI();
j++;
if(!checkACK(&acknack))
return 0 ; //return 0 for error
}
CloseSPI();
Delay10TCYx(1);
return 1 ; //return 1 for OK
}