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shift_registers.ino
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shift_registers.ino
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////////////////////////////////////////////////////////// shift register mini library
//set all register pins to LOW
void clearRegisters()
{
for(int i =0; i <number_of_74hc595 ; i++)
{
registers[i] = LOW;
}
}
void setRegisters(boolean value)
{
if(value==LOW)
{
for(int i =0; i <number_of_74hc595 ; i++)
{
registers[i] = 0;
}
}
else if(value==HIGH)
{
for(int i =0; i <number_of_74hc595 ; i++)
{
registers[i] = 255;
}
}
}
//set an individual pin HIGH or LOW
void setRegisterPin(int index, boolean value)
{
index=numOfRegisterPins-index-1;
if(value==LOW)
{
registers[index>>3] &= ~( 1 << (7-(index%8)) );
}
else if(value==HIGH)
{
registers[index>>3] |= ( 1 << (7-(index%8)) ) ;
}
}
//Set and display registers
//Only call AFTER all values are set how you would like (slow otherwise)
void writeRegisters()
{
//digitalWrite(PIN_SLAVE_SELECT_SHIFT_REGISTER, LOW);
PORTB &= B11111011;
for(int i = 0 ; i< number_of_74hc595 ; i++)
{
SPI.transfer(registers[i]);
}
//digitalWrite(PIN_SLAVE_SELECT_SHIFT_REGISTER, HIGH);
PORTB |= B00000100;
}