added functionality for just a port
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d639bd2021
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b4e30d3929
1 changed files with 62 additions and 32 deletions
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@ -594,34 +594,45 @@ static const uint8_t backlight_pin = BACKLIGHT_PIN;
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# define COM1x1 COM1A1
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# define OCR1x OCR1A
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#else
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# error "Backlight pin not supported - use B5, B6, or B7"
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# define NO_BACKLIGHT_CLOCK
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#endif
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#ifndef BACKLIGHT_ON_STATE
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#define BACKLIGHT_ON_STATE 0
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#endif
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__attribute__ ((weak))
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void backlight_init_ports(void)
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{
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// Setup backlight pin as output and output low.
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// Setup backlight pin as output and output to on state.
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// DDRx |= n
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_SFR_IO8((backlight_pin >> 4) + 1) |= _BV(backlight_pin & 0xF);
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#if BACKLIGHT_ON_STATE == 0
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#else
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// PORTx |= n
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_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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#endif
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// Use full 16-bit resolution.
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ICR1 = 0xFFFF;
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#ifndef NO_BACKLIGHT_CLOCK
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// Use full 16-bit resolution.
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ICR1 = 0xFFFF;
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// I could write a wall of text here to explain... but TL;DW
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// Go read the ATmega32u4 datasheet.
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// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
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// I could write a wall of text here to explain... but TL;DW
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// Go read the ATmega32u4 datasheet.
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// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
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// Pin PB7 = OCR1C (Timer 1, Channel C)
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// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
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// (i.e. start high, go low when counter matches.)
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// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
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// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
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// Pin PB7 = OCR1C (Timer 1, Channel C)
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// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
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// (i.e. start high, go low when counter matches.)
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// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
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// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
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TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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#endif
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backlight_init();
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#ifdef BACKLIGHT_BREATHING
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@ -633,24 +644,43 @@ __attribute__ ((weak))
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void backlight_set(uint8_t level)
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{
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// Prevent backlight blink on lowest level
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#if BACKLIGHT_ON_STATE == 0
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#else
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// PORTx |= n
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_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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#endif
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if ( level == 0 ) {
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// Turn off PWM control on backlight pin, revert to output low.
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TCCR1A &= ~(_BV(COM1x1));
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OCR1x = 0x0;
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} else if ( level == BACKLIGHT_LEVELS ) {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF;
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} else {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
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}
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#ifndef NO_BACKLIGHT_CLOCK
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// Turn off PWM control on backlight pin, revert to output low.
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TCCR1A &= ~(_BV(COM1x1));
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OCR1x = 0x0;
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#else
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#if BACKLIGHT_ON_STATE == 0
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// PORTx |= n
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_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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#else
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#endif
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#endif
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}
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#ifndef NO_BACKLIGHT_CLOCK
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else if ( level == BACKLIGHT_LEVELS ) {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF;
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}
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else {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
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}
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#endif
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#ifdef BACKLIGHT_BREATHING
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breathing_intensity_default();
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