First of all, I do not speak English, and I'm translating all this into Uncle google
The question is that this is my second keyboard based on Teensy 2.0, and the functional part of keyboard works correctly, but the question is that this second keyboard sends it backlight and I'm very lost with it.
To start I have to ask to see if I have the wiring right, which I do not have at all clear:
Pin B6 (PWM) -> Resistance -> Led -> Pin GND
Functional as well or pwm pines can not act as positive and change the circuit to something like this ?:
Pin + 5V -> Resistance -> Led -> Pin B6 (PWM)
My idea is to have 2 independent leds, backlight and leds case, and I would use pins B6 and B7
I have these parts of code backlight.c that gave me the user breh:
Code: Select all
/*
Copyright 2013 Mathias Andersson <wraul@dbox.se>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "backlight.h"
#include "eeconfig.h"
#include "debug.h"
backlight_config_t backlight_config;
void backlight_init(void)
{
//check signature
if (!eeconfig_is_enabled()) {
eeconfig_init();
}
backlight_config.raw = eeconfig_read_backlight();
backlight_set(backlight_config.enable ? backlight_config.level : 0);
}
void backlight_increase(void)
{
if(backlight_config.level < BACKLIGHT_LEVELS)
{
backlight_config.level++;
backlight_config.enable = 1;
eeconfig_write_backlight(backlight_config.raw);
}
dprintf("backlight increase: %u\n", backlight_config.level);
backlight_set(backlight_config.level);
}
void backlight_decrease(void)
{
if(backlight_config.level > 0)
{
backlight_config.level--;
backlight_config.enable = !!backlight_config.level;
eeconfig_write_backlight(backlight_config.raw);
}
dprintf("backlight decrease: %u\n", backlight_config.level);
backlight_set(backlight_config.level);
}
void backlight_toggle(void)
{
backlight_config.enable ^= 1;
eeconfig_write_backlight(backlight_config.raw);
dprintf("backlight toggle: %u\n", backlight_config.enable);
backlight_set(backlight_config.enable ? backlight_config.level : 0);
}
void backlight_step(void)
{
backlight_config.level++;
if(backlight_config.level > BACKLIGHT_LEVELS)
{
backlight_config.level = 0;
}
backlight_config.enable = !!backlight_config.level;
eeconfig_write_backlight(backlight_config.raw);
dprintf("backlight step: %u\n", backlight_config.level);
backlight_set(backlight_config.level);
}
void backlight_level(uint8_t level)
{
backlight_config.level ^= level;
backlight_config.enable = !!backlight_config.level;
eeconfig_write_backlight(backlight_config.raw);
backlight_set(backlight_config.level);
}
// Plank Code for Backlight
//#include <avr/io.h>
//#include "backlight.h"
#define CHANNEL OCR1B
// Plank is OCR1C
void backlight_init_ports()
{
// Setup PB7 as output and output low.
DDRB |= (1<<6);
PORTB &= ~(1<<6);
// 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)
// Pin PB6 = OCR1B (Timer 1, Channel B)
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
// Compare Output Mode = Clear on compare match, Channel C = COM1B1=1 COM1B0=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(COM1B1) | _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 PB6, revert to output low.
TCCR1A &= ~(_BV(COM1B1));
CHANNEL = 0x0;
// Prevent backlight blink on lowest level
PORTB &= ~(_BV(PORTB6));
}
else if ( level == BACKLIGHT_LEVELS )
{
// Prevent backlight blink on lowest level
PORTB &= ~(_BV(PORTB6));
// Turn on PWM control of PB6
TCCR1A |= _BV(COM1B1);
// Set the brightness
CHANNEL = 0xFFFF;
}
else
{
// Prevent backlight blink on lowest level
PORTB &= ~(_BV(PORTB6));
// Turn on PWM control of PB6
TCCR1A |= _BV(COM1B1);
// Set the brightness
CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
}
}Here also the complete keyboard configuration:
Https://dl.dropboxusercontent.com/u/5052546/Shiro.rar
Two pics
