示例#1
0
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);
}
示例#2
0
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);
}