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)); | |||||
} | |||||
} |