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/* Copyright 2018 Jason Williams (Wilba)
*
* 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 "wt_mono_backlight.h"
#include "drivers/avr/i2c_master.h"
#include "drivers/issi/is31fl3736.h"
#include <avr/interrupt.h>
#define ISSI_ADDR_DEFAULT 0x50
bool g_suspend_state = false;
// Global tick at 20 Hz
uint32_t g_tick = 0;
uint8_t g_config_effect_speed = 0;
uint8_t g_config_brightness = 255;
void backlight_init_drivers(void)
{
// Initialize I2C
i2c_init();
IS31FL3736_init( ISSI_ADDR_DEFAULT );
for ( uint8_t index = 0; index < 96; index++ ) {
IS31FL3736_mono_set_led_control_register( index, true );
}
IS31FL3736_update_led_control_registers( ISSI_ADDR_DEFAULT, 0x00 );
}
// This is (F_CPU/1024) / 20 Hz
// = 15625 Hz / 20 Hz
// = 781
#define TIMER3_TOP 781
void backlight_timer_init(void)
{
static uint8_t backlight_timer_is_init = 0;
if ( backlight_timer_is_init ) {
return;
}
backlight_timer_is_init = 1;
// Timer 3 setup
TCCR3B = _BV(WGM32) | // CTC mode OCR3A as TOP
_BV(CS32) | _BV(CS30); // prescale by /1024
// Set TOP value
uint8_t sreg = SREG;
cli();
OCR3AH = (TIMER3_TOP >> 8) & 0xff;
OCR3AL = TIMER3_TOP & 0xff;
SREG = sreg;
}
void backlight_timer_enable(void)
{
TIMSK3 |= _BV(OCIE3A);
}
void backlight_timer_disable(void)
{
TIMSK3 &= ~_BV(OCIE3A);
}
void backlight_set_suspend_state(bool state)
{
g_suspend_state = state;
}
void backlight_effect_cycle_all(void)
{
uint8_t offset = ( g_tick << g_config_effect_speed ) & 0xFF;
backlight_set_brightness_all( offset );
}
ISR(TIMER3_COMPA_vect)
{
// delay 1 second before driving LEDs or doing anything else
static uint8_t startup_tick = 0;
if ( startup_tick < 20 ) {
startup_tick++;
return;
}
g_tick++;
//backlight_effect_cycle_all();
backlight_set_brightness_all( 255 );
}
void backlight_update_pwm_buffers(void)
{
IS31FL3736_update_pwm_buffers(ISSI_ADDR_DEFAULT,0x00);
}
void backlight_set_brightness_all( uint8_t value )
{
IS31FL3736_mono_set_brightness_all( value );
}
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