void display_init(uint8_t brightness)
{
// outputs
DATA_DDR |= _BV(DATA_BIT);
CLOCK_DDR |= _BV(CLOCK_BIT);
LATCH_DDR |= _BV(LATCH_BIT);
BLANK_DDR |= _BV(BLANK_BIT);
// inputs
SIGNATURE_DDR &= ~(_BV(SIGNATURE_BIT_0));
SIGNATURE_DDR &= ~(_BV(SIGNATURE_BIT_1));
SIGNATURE_DDR &= ~(_BV(SIGNATURE_BIT_2));
// enable pullups for shield bits
SIGNATURE_PORT |= _BV(SIGNATURE_BIT_0);
SIGNATURE_PORT |= _BV(SIGNATURE_BIT_1);
SIGNATURE_PORT |= _BV(SIGNATURE_BIT_2);
LATCH_ENABLE;
clear_display();
detect_shield();
// Inititalize timer for multiplexing
TCCR0B |= (1<<CS01); // Set Prescaler to clk/8 : 1 click = 1us. CS21=1
TIMSK0 |= (1<<TOIE0); // Enable Overflow Interrupt Enable
TCNT0 = 0; // Initialize counter
set_brightness(brightness);
}
void display_init(uint8_t brightness)
{
// outputs
DATA_DDR |= _BV(DATA_BIT);
CLOCK_DDR |= _BV(CLOCK_BIT);
STROBE_DDR |= _BV(STROBE_BIT);
BLANK_DDR |= _BV(BLANK_BIT);
EXTRA1_DDR |= _BV(EXTRA1_BIT);
EXTRA2_DDR |= _BV(EXTRA2_BIT);
EXTRA1_LOW;
EXTRA2_LOW;
STROBE_LOW;
BLANK_LOW; // Unblank display
clear_display();
detect_shield();
// PD2 is Strobe
// PB2/OC0A is Blank (with 10k pullup)
// We use Timer0 for both the display multiplext interrupt
// and for PWM on OC0A for blanking
// Inititalize Timer1 for multiplexing interrupt
// TCCR1B = (1<<CS11); // Set Prescaler to clk/8 : 1 click = 1us. CS01=1
// TCCR1B = (1<<CS10); // Set Prescaler to clk/1 : 1 click = 1us. CS00=1 (8 bit timer)
// TCCR1A |= _BV(WGM10); // Set TOP 0x00ff - makes Timer1 an 8 bit timer
// TIMSK |= (1<<TOIE1); // Enable Overflow Interrupt
// TCNT1 = 0; // Initialize counter
// Inititalize Timer0 for PWM on PB2/OC0A (Blank)
TCCR0B = (1<<CS00); // Set Prescaler to clk: 1 click = ???. CS00=1
// fast PWM, 8 bit (TOP=0xff), clear OC0A (Blank pin) on match
TCCR0A |= _BV(COM0A1) | _BV(WGM01) | _BV(WGM00);
TIMSK |= (1<<TOIE0); // Enable Timer0 Overflow Interrupt for Strobe
TCNT0 = 0; // Initialize counter
set_brightness(10);
}