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@ -7,43 +7,43 @@ |
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void backlight_init_ports() |
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{ |
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// Setup PB7 as output and output low. |
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// DDRB |= (1<<7); |
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// PORTB &= ~(1<<7); |
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Setup PB7 as output and output low. |
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DDRB |= (1<<7); |
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PORTB &= ~(1<<7); |
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// // Use full 16-bit resolution. |
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// ICR1 = 0xFFFF; |
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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(COM1C1) | _BV(WGM11); // = 0b00001010; |
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// TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; |
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TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; |
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; |
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backlight_init(); |
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} |
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void backlight_set(uint8_t level) |
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{ |
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// if ( level == 0 ) |
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// { |
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// // Turn off PWM control on PB7, revert to output low. |
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// TCCR1A &= ~(_BV(COM1C1)); |
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// // CHANNEL = level << OFFSET | 0x0FFF; |
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// CHANNEL = ((1 << level) - 1); |
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// } |
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// else |
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// { |
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// // Turn on PWM control of PB7 |
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// TCCR1A |= _BV(COM1C1); |
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// // CHANNEL = level << OFFSET | 0x0FFF; |
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// CHANNEL = ((1 << level) - 1); |
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// } |
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if ( level == 0 ) |
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{ |
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// Turn off PWM control on PB7, revert to output low. |
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TCCR1A &= ~(_BV(COM1C1)); |
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// CHANNEL = level << OFFSET | 0x0FFF; |
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CHANNEL = ((1 << level) - 1); |
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} |
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else |
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{ |
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// Turn on PWM control of PB7 |
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TCCR1A |= _BV(COM1C1); |
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// CHANNEL = level << OFFSET | 0x0FFF; |
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CHANNEL = ((1 << level) - 1); |
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} |
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} |