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-rw-r--r--keyboards/ymd75/backlight.c216
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diff --git a/keyboards/ymd75/backlight.c b/keyboards/ymd75/backlight.c
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1/**
2 * Backlighting code for PS2AVRGB boards (ATMEGA32A)
3 * Kenneth A. (github.com/krusli | krusli.me)
4 Modified by Wayne K Jones (github.com/WarmCatUK) 2018
5 */
6
7#include "backlight.h"
8#include "quantum.h"
9
10#include <avr/pgmspace.h>
11#include <avr/interrupt.h>
12
13#include "backlight_custom.h"
14#include "breathing_custom.h"
15
16// DEBUG
17#include <stdlib.h>
18#include <stdio.h>
19
20// Port D: digital pins of the AVR chipset
21//#define NUMLOCK_PORT (1 << 2) // 2nd pin of Port D (digital)
22#define CAPSLOCK_PORT (1 << 1) // 1st pin
23#define BACKLIGHT_PORT (1 << 4) // D4
24//#define SCROLLLOCK_PORT (1 << 6) // D6
25
26#define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64
27#define TIMER1PRESCALE TIMER_CLK_DIV64 ///< timer 1 prescaler default
28
29#define TIMER_PRESCALE_MASK 0x07 ///< Timer Prescaler Bit-Mask
30
31#define PWM_MAX 0xFF
32#define TIMER_TOP 255 // 8 bit PWM
33
34extern backlight_config_t backlight_config;
35
36/**
37 * References
38 * Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
39 * TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
40 * Timers: http://www.avrbeginners.net/architecture/timers/timers.html
41 * 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
42 * PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
43 */
44
45// @Override
46// turn LEDs on and off depending on USB caps/num/scroll lock states.
47__attribute__ ((weak))
48void led_set_user(uint8_t usb_led) {
49 /*
50 if (usb_led & (1 << USB_LED_NUM_LOCK)) {
51 // turn on
52 DDRD |= NUMLOCK_PORT;
53 PORTD |= NUMLOCK_PORT;
54 } else {
55 // turn off
56 DDRD &= ~NUMLOCK_PORT;
57 PORTD &= ~NUMLOCK_PORT;
58 }
59 */
60 if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
61 DDRD |= CAPSLOCK_PORT;
62 PORTD |= CAPSLOCK_PORT;
63 } else {
64 DDRD &= ~CAPSLOCK_PORT;
65 PORTD &= ~CAPSLOCK_PORT;
66 }
67 /*
68 if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
69 DDRD |= SCROLLLOCK_PORT;
70 PORTD |= SCROLLLOCK_PORT;
71 } else {
72 DDRD &= ~SCROLLLOCK_PORT;
73 PORTD &= ~SCROLLLOCK_PORT;
74 }
75 */
76}
77
78#ifdef BACKLIGHT_ENABLE
79
80// sets up Timer 1 for 8-bit PWM
81void timer1PWMSetup(void) { // NOTE ONLY CALL THIS ONCE
82 // default 8 bit mode
83 TCCR1A &= ~(1 << 1); // cbi(TCCR1A,PWM11); <- set PWM11 bit to HIGH
84 TCCR1A |= (1 << 0); // sbi(TCCR1A,PWM10); <- set PWM10 bit to LOW
85
86 // clear output compare value A
87 // outb(OCR1AH, 0);
88 // outb(OCR1AL, 0);
89
90 // clear output comparator registers for B
91 OCR1BH = 0; // outb(OCR1BH, 0);
92 OCR1BL = 0; // outb(OCR1BL, 0);
93}
94
95bool is_init = false;
96void timer1Init(void) {
97 // timer1SetPrescaler(TIMER1PRESCALE)
98 // set to DIV/64
99 (TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | TIMER1PRESCALE;
100
101 // reset TCNT1
102 TCNT1H = 0; // outb(TCNT1H, 0);
103 TCNT1L = 0; // outb(TCNT1L, 0);
104
105 // TOIE1: Timer Overflow Interrupt Enable (Timer 1);
106 TIMSK |= _BV(TOIE1); // sbi(TIMSK, TOIE1);
107
108 is_init = true;
109}
110
111void timer1UnInit(void) {
112 // set prescaler back to NONE
113 (TCCR1B) = ((TCCR1B) & ~TIMER_PRESCALE_MASK) | 0x00; // TIMERRTC_CLK_STOP
114
115 // disable timer overflow interrupt
116 TIMSK &= ~_BV(TOIE1); // overflow bit?
117
118 setPWM(0);
119
120 is_init = false;
121}
122
123
124// handle TCNT1 overflow
125//! Interrupt handler for tcnt1 overflow interrupt
126ISR(TIMER1_OVF_vect, ISR_NOBLOCK)
127{
128 // sei();
129 // handle breathing here
130 #ifdef BACKLIGHT_BREATHING
131 if (is_breathing()) {
132 custom_breathing_handler();
133 }
134 #endif
135
136 // TODO call user defined function
137}
138
139// enable timer 1 PWM
140// timer1PWMBOn()
141void timer1PWMBEnable(void) {
142 // turn on channel B (OC1B) PWM output
143 // set OC1B as non-inverted PWM
144 TCCR1A |= _BV(COM1B1);
145 TCCR1A &= ~_BV(COM1B0);
146}
147
148// disable timer 1 PWM
149// timer1PWMBOff()
150void timer1PWMBDisable(void) {
151 TCCR1A &= ~_BV(COM1B1);
152 TCCR1A &= ~_BV(COM1B0);
153}
154
155void enableBacklight(void) {
156 DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
157 PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
158}
159
160void disableBacklight(void) {
161 // DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
162 PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
163}
164
165void startPWM(void) {
166 timer1Init();
167 timer1PWMBEnable();
168 enableBacklight();
169}
170
171void stopPWM(void) {
172 timer1UnInit();
173 disableBacklight();
174 timer1PWMBDisable();
175}
176
177void b_led_init_ports(void) {
178 /* turn backlight on/off depending on user preference */
179 #if BACKLIGHT_ON_STATE == 0
180 // DDRx register: sets the direction of Port D
181 // DDRD &= ~BACKLIGHT_PORT; // set digital pin 4 as input
182 PORTD &= ~BACKLIGHT_PORT; // set digital pin 4 to low
183 #else
184 DDRD |= BACKLIGHT_PORT; // set digital pin 4 as output
185 PORTD |= BACKLIGHT_PORT; // set digital pin 4 to high
186 #endif
187
188 timer1PWMSetup();
189 startPWM();
190
191 #ifdef BACKLIGHT_BREATHING
192 breathing_enable();
193 #endif
194}
195
196void b_led_set(uint8_t level) {
197 if (level > BACKLIGHT_LEVELS) {
198 level = BACKLIGHT_LEVELS;
199 }
200
201 setPWM((int)(TIMER_TOP * (float) level / BACKLIGHT_LEVELS));
202}
203
204// called every matrix scan
205void b_led_task(void) {
206 // do nothing for now
207}
208
209void setPWM(uint16_t xValue) {
210 if (xValue > TIMER_TOP) {
211 xValue = TIMER_TOP;
212 }
213 OCR1B = xValue; // timer1PWMBSet(xValue);
214}
215
216#endif // BACKLIGHT_ENABLE
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