Start building timing and animation code

dio/dio.h

@@ -51,7 +51,7 @@ inline void dio_set(dio_t *line, bool value) {
     }
 }
 
-inline int dio_read(dio_t *line) {
+inline uint8_t dio_read(dio_t *line) {
     return (*(line->pin) & _BV(line->addr)) > 0;
 }
 

lantern/main.c

@@ -12,7 +12,75 @@ You should have received a copy of the GNU General Public License along with thi
 
 #include <dio.h>
 #include <sk9822.h>
+#include <avr/sleep.h>
+
+#define FPS             15
+#define ANIMATION_DELAY 1000 / 15
+
+uint8_t bound (uint8_t value, uint8_t min, uint8_t max) {
+    if (value < min) {
+        return min;
+    } else if (value > max) {
+        return max;
+    } else {
+        return value;
+    }
+}
+
+void flash_status(dio_t *light) {
+    dio_set(light, 1);
+    _delay_ms(100);
+    dio_set(light, 0);
+}
 
 int main(void) {
+    dio_t status_light = { .ddr = &DDRC, .port = &PORTC, .pin = &PINC, .addr = 7 };
+    dio_set_direction(&status_light, LINE_OUT);
+
+    dio_t buttons[4] = {
+        { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 5 },
+        { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 6 },
+        { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 7 },
+        { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 6 },
+    };
+    for (int i = 0; i < 4; i++) {
+        dio_set_direction(&buttons[i], LINE_IN);
+    }
+
+    sk9822_t lights = {
+        .data_pin = { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 1 },
+        .clock_pin = { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 0 }
+    };
+
+    rgb_t colors[3] = {
+        { .brightness = 1, .r = 128, .g = 0, .b = 0, },
+        { .brightness = 1, .r = 0, .g = 128, .b = 0, },
+        { .brightness = 1, .r = 0, .g = 0, .b = 128, },
+    };
+
+    sk9822_init(&lights);
+    sk9822_send(&lights, colors, 3);
+
+    int flash_recovery = 0;
+
+    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+
+    while (1) {
+        if (flash_recovery == 0) {
+            uint8_t value = dio_read(&buttons[0]);
+            if (value != 0) {
+                flash_status(&status_light);
+                flash_recovery = 128;
+            }
+        } else {
+            colors[0] = (rgb_t){ .brightness = bound(flash_recovery / 4, 1, 31), .r = 128 + flash_recovery, .g = flash_recovery * 2,   .b = flash_recovery * 2 },
+            colors[1] = (rgb_t){ .brightness = bound(flash_recovery / 4, 1, 31), .r = flash_recovery * 2,   .g = 128 + flash_recovery, .b = flash_recovery * 2 },
+            colors[2] = (rgb_t){ .brightness = bound(flash_recovery / 4, 1, 31), .r = flash_recovery * 2,   .g = flash_recovery * 2,   .b = 128 + flash_recovery },
+            sk9822_send(&lights, colors, 3);
+            flash_recovery -= 2;
+        }
+        _delay_ms(ANIMATION_DELAY);
+    }
+
     return 0;
 }

sk9822/sk9822.c

@@ -35,6 +35,11 @@ void send_term(dio_t data_pin, dio_t clock_pin) {
     send_byte(data_pin, clock_pin, 0xff);
 }
 
+void sk9822_init(sk9822_t *lights) {
+    dio_set_direction(&lights->data_pin, LINE_OUT);
+    dio_set_direction(&lights->clock_pin, LINE_OUT);
+}
+
 void sk9822_send(sk9822_t *lights, rgb_t * pixels, uint8_t count) {
     send_start(lights->data_pin, lights->clock_pin);
     for (uint8_t i = 0; i < count; i++) {

sk9822/sk9822.h

@@ -28,6 +28,8 @@ typedef struct SK9822 {
     dio_t clock_pin;
 } sk9822_t;
 
+void sk9822_init(sk9822_t *lights);
+
 void sk9822_send(sk9822_t *lights, rgb_t *pixels, uint8_t count);
 
 #endif

timer/timer.h

@@ -0,0 +1,56 @@
+/*
+Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of Savanni's AVR library.
+
+This AVR library 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 3 of the License, or (at your option) any later version.
+
+This AVR library 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 Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TIMER_H__
+#define __TIMER_H__
+
+#include <avr/io.h>
+
+// ATmega16U4/32U4 Datasheet, table 14.4, page 133
+typedef enum {
+    normal,
+    pwm_phasecorrect_8bit,
+    pwm_phasecorrect_9bit,
+    pwm_phasecorrect_10bit,
+    ctc,
+    fast_pwm_8bit,
+    fast_pwm_9bit,
+    fast_pwm_10bit,
+    pwm_phase_and_frequency_correct_icrtop,
+    pwm_phase_and_frequency_correct_ocrtop,
+    pwm_phase_correct_icrtop,
+    pwm_phase_correct_ocrtop,
+    ctc_icr,
+    fast_pwm_icrtop,
+    fast_pwm_ocrtop,
+} timer_mode_t;
+
+// Clock prescaler selector, ATmega16U4/32U4 Datasheet, table 14.5, page 1354p
+typedef enum {
+    none,
+    clk_1,
+    clk_8,
+    clk_64,
+    clk_256,
+    clk_1024,
+    external_falling_edge,
+    external_rising_edge,
+} clock_select_t;
+
+typedef struct {
+    volatile uint8_t count_msb;
+    volatile uint8_t count_lsb;
+    volatile uint8_t top_msb;
+    volatile uint8_t top_lsb;
+} timer_16bit_t;
+
+#endif