void send_packet(uint8_t byte) {
uint8_t parity;
parity = oparity(byte);
clk(0);
_delay_us(DELAY);
data(0); //Start
clk(1);
CDDR &= ~(1 << CBIT); // Release clock
CPORT |= (1 << CBIT); //Set the pull up on Clock
/////////////
serout((byte & (1 << 0)) >> 0);
serout((byte & (1 << 1)) >> 1);
serout((byte & (1 << 2)) >> 2);
serout((byte & (1 << 3)) >> 3);
serout((byte & (1 << 4)) >> 4);
serout((byte & (1 << 5)) >> 5);
serout((byte & (1 << 6)) >> 6);
serout((byte & (1 << 7)) >> 7);
/////////////
serout(parity);
/////////////
serout(1); //Stop
DDDR &= ~(1 << DBIT); //Release the Data line
DPORT |= (1 << DBIT); //Set the pull up on Data
/////////////
if(serin() != ACK)
send_packet(byte); // Try again if ACK has not been received
return;
}
bool send_packet(uint8_t byte)
{
/// @todo Error checking in PS/2 code
uint8_t sent_retries=0;
do {
uint8_t parity = oparity(byte);
clk(0);
_delay_us(DELAY);
data(0); //Start
clk(1);
CDDR &= ~(1 << CBIT); // Release clock
CPORT |= (1 << CBIT); //Set the pull up on Clock
/////////////
serout((byte & (1 << 0)) >> 0);
serout((byte & (1 << 1)) >> 1);
serout((byte & (1 << 2)) >> 2);
serout((byte & (1 << 3)) >> 3);
serout((byte & (1 << 4)) >> 4);
serout((byte & (1 << 5)) >> 5);
serout((byte & (1 << 6)) >> 6);
serout((byte & (1 << 7)) >> 7);
serout(parity);
serout(1); //Stop
DDDR &= ~(1 << DBIT); //Release the Data line
DPORT |= (1 << DBIT); //Set the pull up on Data
//if(serin() != PS2_ACK )
// send_packet(byte); // Try again if PS2_ACK has not been received
sent_retries++;
} while (serin() != 0 && sent_retries < 5 );
if(sent_retries >= 5)
return false;
return true;
}
uint8_t read_packet(void) {
uint8_t byte=0,par;
serin(); //Start
byte |= (serin() << 0);
byte |= (serin() << 1);
byte |= (serin() << 2);
byte |= (serin() << 3);
byte |= (serin() << 4);
byte |= (serin() << 5);
byte |= (serin() << 6);
byte |= (serin() << 7);
par = serin(); //Parity
serin(); //Stop
if(par != oparity(byte))
send_packet(0xfe); //Resend
return byte;
}
