355 lines
10 KiB
C
355 lines
10 KiB
C
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/***************************************************************************
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* Copyright (C) 01/2019 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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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; version 2 of the License, *
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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, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "pwm.h"
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#include "timer.h"
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/* *********************************************************************** */
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#define PWM_TIM_16BIT 1
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#define PWM_TIM_INIT() { \
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/* enable output for OC1A, OC1B, OC3A */ \
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DDRB |= (1<<PORTB5) | (1<<PORTB6); \
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DDRC |= (1<<PORTC6); \
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/* reset and hold prescaler */ \
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GTCCR = (1<<TSM) | (1<<PSRSYNC); \
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/* FastModePWM, ICRn is TOP */ \
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TCCR1A = (1<<WGM11); \
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TCCR1B = (1<<WGM13) | (1<<WGM12); \
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ICR1 = 0xFFFF; \
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TCNT1 = 0x0000; \
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TCCR3A = (1<<WGM31); \
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TCCR3B = (1<<WGM33) | (1<<WGM32); \
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ICR3 = 0xFFFF; \
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TCNT3 = 0x8000; \
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/* release prescaler */ \
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GTCCR = (1<<PSRSYNC); \
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}
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#define PWM_TIM1_ENABLE() { TCCR1B |= (1<<CS10); }
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#define PWM_TIM1_DISABLE() { TCCR1B &= ~(1<<CS10); }
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#define PWM_TIM1_RUNNING() (TCCR1B & ((1<<CS10) | (1<<CS11) | (1<<CS12)))
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#define PWM_TIM1_CHECK() (TCCR1A & ((1<<COM1A1) | (1<<COM1B1)))
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#define PWM_TIM3_ENABLE() { TCCR3B |= (1<<CS30); }
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#define PWM_TIM3_DISABLE() { TCCR3B &= ~(1<<CS30); }
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#define PWM_TIM3_RUNNING() (TCCR3B & ((1<<CS30) | (1<<CS31) | (1<<CS32)))
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#define PWM_TIM3_CHECK() (TCCR3A & ((1<<COM3A1) | (1<<COM3B1)))
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#define PWM_TIMER_FADE_STEP_MS 10
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#define PWM_CH0_PORT PORTB
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#define PWM_CH0_NUM 5
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#define PWM_CH0_OFF() { PWM_CH0_PORT &= ~(1<<PWM_CH0_NUM); TCCR1A &= ~(1<<COM1A1); }
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#define PWM_CH0_ON() { PWM_CH0_PORT |= (1<<PWM_CH0_NUM); TCCR1A &= ~(1<<COM1A1); }
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#define PWM_CH0_PWM(x) { PWM_CH0_PORT &= ~(1<<PWM_CH0_NUM); TCCR1A |= (1<<COM1A1); OCR1A = x; }
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#define PWM_CH1_PORT PORTB
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#define PWM_CH1_NUM 6
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#define PWM_CH1_OFF() { PWM_CH1_PORT &= ~(1<<PWM_CH1_NUM); TCCR1A &= ~(1<<COM1B1); }
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#define PWM_CH1_ON() { PWM_CH1_PORT |= (1<<PWM_CH1_NUM); TCCR1A &= ~(1<<COM1B1); }
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#define PWM_CH1_PWM(x) { PWM_CH1_PORT &= ~(1<<PWM_CH1_NUM); TCCR1A |= (1<<COM1B1); OCR1B = x; }
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#define PWM_CH2_PORT PORTC
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#define PWM_CH2_NUM 6
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#define PWM_CH2_OFF() { PWM_CH2_PORT &= ~(1<<PWM_CH2_NUM); TCCR3A &= ~(1<<COM3A1); }
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#define PWM_CH2_ON() { PWM_CH2_PORT |= (1<<PWM_CH2_NUM); TCCR3A &= ~(1<<COM3A1); }
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#define PWM_CH2_PWM(x) { PWM_CH2_PORT &= ~(1<<PWM_CH2_NUM); TCCR3A |= (1<<COM3A1); OCR3A = x; }
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#if (PWM_TIM_16BIT)
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#define PWM_TABLE_SIZE 128
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#define PWM_TABLE_GET(x) pgm_read_word(&pwmtable16[x])
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const uint16_t pwmtable16[PWM_TABLE_SIZE] PROGMEM =
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{
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0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5,
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6, 6, 7, 8, 9, 9, 10, 11, 12, 14, 15, 16, 18, 20, 22, 24, 26,
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28, 31, 34, 37, 40, 44, 48, 53, 58, 63, 69, 75, 82, 90, 98,
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107, 116, 127, 139, 151, 165, 180, 196, 214, 234, 255, 278,
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303, 331, 361, 394, 430, 469, 511, 557, 608, 663, 723, 789,
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860, 938, 1023, 1116, 1217, 1327, 1447, 1578, 1721, 1877,
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2047, 2232, 2434, 2655, 2895, 3157, 3443, 3755, 4095, 4466,
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4870, 5311, 5792, 6316, 6888, 7511, 8191, 8932, 9741, 10623,
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11584, 12633, 13776, 15023, 16383, 17866, 19483, 21246, 23169,
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25267, 27553, 30047, 32767, 35733, 38967, 42494, 46340, 50534,
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55108, 60096, 65535
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};
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#else
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#define PWM_TABLE_SIZE 32
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#define PWM_TABLE_GET(x) pgm_read_byte(&pwmtable8[x])
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const uint8_t pwmtable8[PWM_TABLE_SIZE] PROGMEM =
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{
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0, 0, 1, 1, 1, 2, 2, 3,
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4, 5, 6, 7, 9, 10, 12, 15,
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18, 22, 26, 31, 37, 44, 53, 63,
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75, 90, 107, 127, 151, 180, 214, 255
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};
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#endif
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static uint8_t pwm_index[3];
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static uint8_t pwm_setpoint[3];
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static uint8_t pwm_setpoint_save[3];
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static uint8_t pwm_fade_timer_running;
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/* *********************************************************************** */
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static void pwm_update(uint8_t channel)
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{
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uint8_t check_setpoint = 0;
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if (pwm_setpoint[channel] >= PWM_TABLE_SIZE)
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{
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pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
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}
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if ((pwm_setpoint[channel] > pwm_index[channel]) &&
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(pwm_index[channel] < (PWM_TABLE_SIZE - 1))
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)
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{
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pwm_index[channel]++;
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check_setpoint = 1;
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}
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else if ((pwm_setpoint[channel] < pwm_index[channel]) &&
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(pwm_index[channel] > 0)
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)
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{
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pwm_index[channel]--;
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check_setpoint = 1;
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}
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/* setpoint reached, notify others */
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if (check_setpoint)
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{
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if (pwm_index[channel] == pwm_setpoint[channel])
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{
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event_queue(EVENT_TYPE_PWM_STATUS,
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channel,
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pwm_setpoint[channel]);
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}
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else if (!pwm_fade_timer_running)
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{
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event_queue(EVENT_TYPE_TIMER_SET,
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EVENT_NUM_TIMER_PWM,
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PWM_TIMER_FADE_STEP_MS);
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pwm_fade_timer_running = 1;
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}
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}
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/* if PWM is zero, disable output */
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if (pwm_index[channel] == 0)
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{
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switch (channel)
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{
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case 0:
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PWM_CH0_OFF();
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break;
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case 1:
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PWM_CH1_OFF();
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break;
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case 2:
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PWM_CH2_OFF();
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break;
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default:
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break;
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}
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}
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/* if PWM is max, enable output */
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else if (pwm_index[channel] == (PWM_TABLE_SIZE - 1))
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{
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switch (channel)
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{
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case 0:
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PWM_CH0_ON();
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break;
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case 1:
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PWM_CH1_ON();
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break;
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case 2:
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PWM_CH2_ON();
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break;
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default:
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break;
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}
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}
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/* else load new PWM into timer */
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else
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{
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switch (channel)
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{
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case 0:
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PWM_CH0_PWM(PWM_TABLE_GET(pwm_index[0]));
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break;
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case 1:
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PWM_CH1_PWM(PWM_TABLE_GET(pwm_index[1]));
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break;
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case 2:
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PWM_CH2_PWM(PWM_TABLE_GET(pwm_index[2]));
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break;
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default:
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break;
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}
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}
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switch (channel)
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{
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case 0:
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case 1:
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/* disable timer if all channels are ON or OFF */
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if (PWM_TIM1_CHECK())
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{
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PWM_TIM1_ENABLE();
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}
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else
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{
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PWM_TIM1_DISABLE();
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}
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break;
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case 2:
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/* disable timer if all channels are ON or OFF */
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if (PWM_TIM3_CHECK())
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{
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PWM_TIM3_ENABLE();
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}
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else
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{
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PWM_TIM3_DISABLE();
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}
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break;
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}
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} /* pwm_update */
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void pwm_event_handler(event_entry_t * p_event)
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{
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if (p_event->type == EVENT_TYPE_PWM_COMMAND)
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{
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uint8_t channel = p_event->num;
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switch (p_event->value)
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{
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case EVENT_VALUE_PWM_KEEP:
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pwm_setpoint[channel] = pwm_index[channel];
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break;
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/* increment PWM */
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case EVENT_VALUE_PWM_INC:
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if (pwm_setpoint[channel] < (PWM_TABLE_SIZE - 1))
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{
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pwm_setpoint[channel]++;
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}
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break;
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/* decrement PWM */
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case EVENT_VALUE_PWM_DEC:
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if (pwm_setpoint[channel] > 0)
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{
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pwm_setpoint[channel]--;
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}
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break;
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/* fade to min */
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case EVENT_VALUE_PWM_FADE_MIN:
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pwm_setpoint[channel] = 0;
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break;
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/* fade to max */
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case EVENT_VALUE_PWM_FADE_MAX:
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pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
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break;
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/* toggle between 0 and stored value */
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case EVENT_VALUE_PWM_TOGGLE:
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if (pwm_setpoint[channel] > 5)
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{
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pwm_setpoint_save[channel] = pwm_setpoint[channel];
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pwm_setpoint[channel] = 0;
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}
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else
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{
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pwm_setpoint[channel] = pwm_setpoint_save[channel];
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}
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break;
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default:
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break;
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}
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pwm_update(channel);
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}
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else if (p_event->type == EVENT_TYPE_PWM_VALUE)
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{
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uint8_t channel = p_event->num;
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if (p_event->value < PWM_TABLE_SIZE)
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{
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pwm_setpoint[channel] = p_event->value;
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}
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else
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{
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pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
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}
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pwm_update(channel);
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}
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else if ((p_event->type == EVENT_TYPE_TIMER_ELAPSED) &&
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(p_event->num == EVENT_NUM_TIMER_PWM)
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)
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{
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pwm_fade_timer_running = 0;
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pwm_update(0);
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pwm_update(1);
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pwm_update(2);
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}
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} /* pwm_event_handler */
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uint8_t pwm_get_sleep_mode(void)
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{
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if (PWM_TIM1_RUNNING() || PWM_TIM3_RUNNING())
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{
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return SLEEP_MODE_IDLE;
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}
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else
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{
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return SLEEP_MODE_PWR_DOWN;
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}
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} /* pwm_get_sleep_mode */
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void pwm_init(void)
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{
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PWM_TIM_INIT();
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} /* pwm_init */
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