previously there were two backlight.c files (bad)pull/292/head
@ -1,63 +0,0 @@ | |||
#include <avr/io.h> | |||
#include "backlight.h" | |||
#include "atomic.h" | |||
#define CHANNEL OCR1C | |||
void backlight_init_ports() | |||
{ | |||
// Setup PB7 as output and output low. | |||
DDRB |= (1<<7); | |||
PORTB &= ~(1<<7); | |||
// Use full 16-bit resolution. | |||
ICR1 = 0xFFFF; | |||
// I could write a wall of text here to explain... but TL;DW | |||
// Go read the ATmega32u4 datasheet. | |||
// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on | |||
// Pin PB7 = OCR1C (Timer 1, Channel C) | |||
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 | |||
// (i.e. start high, go low when counter matches.) | |||
// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 | |||
// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 | |||
TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; | |||
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; | |||
backlight_init(); | |||
} | |||
void backlight_set(uint8_t level) | |||
{ | |||
if ( level == 0 ) | |||
{ | |||
// Turn off PWM control on PB7, revert to output low. | |||
TCCR1A &= ~(_BV(COM1C1)); | |||
CHANNEL = 0x0; | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
} | |||
else if ( level == BACKLIGHT_LEVELS ) | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF; | |||
} | |||
else | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); | |||
} | |||
} |
@ -1,61 +0,0 @@ | |||
#include <avr/io.h> | |||
#include "backlight.h" | |||
#define CHANNEL OCR1C | |||
void backlight_init_ports() | |||
{ | |||
// Setup PB7 as output and output low. | |||
DDRB |= (1<<7); | |||
PORTB &= ~(1<<7); | |||
// Use full 16-bit resolution. | |||
ICR1 = 0xFFFF; | |||
// I could write a wall of text here to explain... but TL;DW | |||
// Go read the ATmega32u4 datasheet. | |||
// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on | |||
// Pin PB7 = OCR1C (Timer 1, Channel C) | |||
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 | |||
// (i.e. start high, go low when counter matches.) | |||
// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 | |||
// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 | |||
TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; | |||
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; | |||
backlight_init(); | |||
} | |||
void backlight_set(uint8_t level) | |||
{ | |||
if ( level == 0 ) | |||
{ | |||
// Turn off PWM control on PB7, revert to output low. | |||
TCCR1A &= ~(_BV(COM1C1)); | |||
CHANNEL = 0x0; | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
} | |||
else if ( level == BACKLIGHT_LEVELS ) | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF; | |||
} | |||
else | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); | |||
} | |||
} |
@ -1,61 +0,0 @@ | |||
#include <avr/io.h> | |||
#include "backlight.h" | |||
#define CHANNEL OCR1C | |||
void backlight_init_ports() | |||
{ | |||
// Setup PB7 as output and output low. | |||
DDRB |= (1<<7); | |||
PORTB &= ~(1<<7); | |||
// Use full 16-bit resolution. | |||
ICR1 = 0xFFFF; | |||
// I could write a wall of text here to explain... but TL;DW | |||
// Go read the ATmega32u4 datasheet. | |||
// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on | |||
// Pin PB7 = OCR1C (Timer 1, Channel C) | |||
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 | |||
// (i.e. start high, go low when counter matches.) | |||
// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 | |||
// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 | |||
TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; | |||
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; | |||
backlight_init(); | |||
} | |||
void backlight_set(uint8_t level) | |||
{ | |||
if ( level == 0 ) | |||
{ | |||
// Turn off PWM control on PB7, revert to output low. | |||
TCCR1A &= ~(_BV(COM1C1)); | |||
CHANNEL = 0x0; | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
} | |||
else if ( level == BACKLIGHT_LEVELS ) | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF; | |||
} | |||
else | |||
{ | |||
// Prevent backlight blink on lowest level | |||
PORTB &= ~(_BV(PORTB7)); | |||
// Turn on PWM control of PB7 | |||
TCCR1A |= _BV(COM1C1); | |||
// Set the brightness | |||
CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); | |||
} | |||
} |