117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
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/* Copyright 2018 Jason Williams (Wilba)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "wt_mono_backlight.h"
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#include "drivers/avr/i2c_master.h"
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#include "drivers/issi/is31fl3736.h"
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#include <avr/interrupt.h>
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#define ISSI_ADDR_DEFAULT 0x50
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bool g_suspend_state = false;
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// Global tick at 20 Hz
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uint32_t g_tick = 0;
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uint8_t g_config_effect_speed = 0;
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uint8_t g_config_brightness = 255;
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void backlight_init_drivers(void)
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{
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// Initialize I2C
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i2c_init();
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IS31FL3736_init( ISSI_ADDR_DEFAULT );
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for ( uint8_t index = 0; index < 96; index++ ) {
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IS31FL3736_mono_set_led_control_register( index, true );
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}
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IS31FL3736_update_led_control_registers( ISSI_ADDR_DEFAULT, 0x00 );
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}
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// This is (F_CPU/1024) / 20 Hz
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// = 15625 Hz / 20 Hz
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// = 781
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#define TIMER3_TOP 781
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void backlight_timer_init(void)
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{
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static uint8_t backlight_timer_is_init = 0;
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if ( backlight_timer_is_init ) {
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return;
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}
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backlight_timer_is_init = 1;
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// Timer 3 setup
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TCCR3B = _BV(WGM32) | // CTC mode OCR3A as TOP
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_BV(CS32) | _BV(CS30); // prescale by /1024
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// Set TOP value
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uint8_t sreg = SREG;
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cli();
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OCR3AH = (TIMER3_TOP >> 8) & 0xff;
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OCR3AL = TIMER3_TOP & 0xff;
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SREG = sreg;
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}
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void backlight_timer_enable(void)
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{
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TIMSK3 |= _BV(OCIE3A);
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}
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void backlight_timer_disable(void)
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{
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TIMSK3 &= ~_BV(OCIE3A);
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}
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void backlight_set_suspend_state(bool state)
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{
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g_suspend_state = state;
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}
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void backlight_effect_cycle_all(void)
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{
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uint8_t offset = ( g_tick << g_config_effect_speed ) & 0xFF;
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backlight_set_brightness_all( offset );
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}
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ISR(TIMER3_COMPA_vect)
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{
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// delay 1 second before driving LEDs or doing anything else
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static uint8_t startup_tick = 0;
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if ( startup_tick < 20 ) {
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startup_tick++;
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return;
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}
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g_tick++;
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//backlight_effect_cycle_all();
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backlight_set_brightness_all( 255 );
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}
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void backlight_update_pwm_buffers(void)
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{
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IS31FL3736_update_pwm_buffers(ISSI_ADDR_DEFAULT,0x00);
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}
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void backlight_set_brightness_all( uint8_t value )
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{
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IS31FL3736_mono_set_brightness_all( value );
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}
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