/*
Main High level function to write a single byte to
Output shift register 74HC595.
Arguments:
single byte to write to the 74HC595 IC
Returns:
NONE
Description:
The byte is serially transfered to 74HC595
and then latched. The byte is then available on
output line Q0 to Q7 of the HC595 IC.
*/
void HC595Write(uint8_t data)
{
//Send each 8 bits serially
//Order is MSB first
for(uint8_t i=0;i<8;i++)
{
//Output the data on DS line according to the
//Value of MSB
if(data & 0b10000000)
{
//MSB is 1 so output high
HC595DataHigh();
}
else
{
//MSB is 0 so output high
HC595DataLow();
}
HC595Pulse(); //Pulse the Clock line
data=data<<1; //Now bring next bit at MSB position
}
//Now all 8 bits have been transferred to shift register
//Move them to output latch at one
HC595Latch();
}
void HC595SendByte(uint8_t data){
for(uint8_t i = 0; i < 8; i++){
if(data & 0b10000000){
HC595DataHigh();
}else{
HC595DataLow();
}
HC595Pulse();
data = data << 1;
}
HC595Latch();
CD4017Pulse();
_delay_ms(1);
}