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diff --git a/keyboards/mschwingen/modelm/modelm.c b/keyboards/mschwingen/modelm/modelm.c
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+/*
+ * Copyright 2020 Michael Schwingen
+
+ * 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 <util/delay.h>
+#include "modelm.h"
+#include "uart.h"
+#include "print.h"
+#include "sendchar.h"
+#include "ws2812.h"
+#include "modelm.h"
+#include "sleep_led.h"
+
+#ifdef UART_DEBUG
+# undef sendchar
+static int8_t capture_sendchar(uint8_t c) {
+ // sendchar(c);
+ uart_putchar(c);
+ return 0;
+}
+#endif
+
+static uint16_t blink_cycle_timer;
+static bool blink_state = false;
+static uint8_t isRecording = 0;
+
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+# if RGBLED_NUM < 3
+# error we need at least 3 RGB LEDs!
+# endif
+static cRGB led[RGBLED_NUM] = {{255, 255, 255}, {255, 255, 255}, {255, 255, 255}};
+
+# define BRIGHT 32
+# define DIM 6
+
+static const cRGB black = {.r = 0, .g = 0, .b = 0};
+
+static const cRGB green = {.r = 0, .g = BRIGHT, .b = 0};
+static const cRGB lgreen = {.r = 0, .g = DIM, .b = 0};
+
+static const cRGB red = {.r = BRIGHT, .g = 0, .b = 0};
+static const cRGB lred = {.r = DIM, .g = 0, .b = 0};
+
+static const cRGB blue = {.r = 0, .g = 0, .b = BRIGHT};
+static const cRGB lblue = {.r = 0, .g = 0, .b = DIM};
+
+static const cRGB turq = {.r = 0, .g = BRIGHT, .b = BRIGHT};
+static const cRGB lturq = {.r = 0, .g = DIM, .b = DIM};
+
+static const cRGB white = {.r = BRIGHT, .g = BRIGHT, .b = BRIGHT};
+
+static led_t led_state;
+static uint8_t layer;
+static uint8_t default_layer;
+#endif
+
+// we need our own sleep_led_* implementation to get callbacks on USB
+// suspend/resume in order to completely turn off WS2812 LEDs
+static bool suspend_active = false;
+void sleep_led_init(void) {}
+
+void sleep_led_toggle(void) {}
+
+void sleep_led_disable(void) {
+ suspend_active = false;
+ writePinHigh(QMK_LED);
+}
+
+void sleep_led_enable(void) {
+ suspend_active = true;
+ writePinLow(QMK_LED);
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+ led[0] = black;
+ led[1] = black;
+ led[2] = black;
+ ws2812_setleds(led, RGBLED_NUM);
+#endif
+}
+
+void keyboard_pre_init_kb(void) {
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+ ws2812_setleds(led, RGBLED_NUM);
+#else
+ /* Set status LEDs pins to output and Low (on) */
+ setPinOutput(MODELM_LED_CAPSLOCK);
+ setPinOutput(MODELM_LED_SCROLLOCK);
+ setPinOutput(MODELM_LED_NUMLOCK);
+ writePinLow(MODELM_LED_CAPSLOCK);
+ writePinLow(MODELM_LED_SCROLLOCK);
+ writePinLow(MODELM_LED_NUMLOCK);
+#endif
+ setPinOutput(QMK_LED);
+ writePinHigh(QMK_LED);
+ _delay_ms(50);
+#ifdef UART_DEBUG
+ uart_init(115200);
+ print_set_sendchar(capture_sendchar);
+ uprintf("\r\nHello world!\r\n");
+#endif
+
+ setPinOutput(SR_LOAD_PIN);
+ setPinOutput(SR_CLK_PIN);
+ setPinOutput(SR_DOUT_PIN); // MOSI - unused
+ writePinLow(SR_CLK_PIN);
+}
+
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+static void led_update_rgb(void) {
+ if (isRecording && blink_state) {
+ led[0] = white;
+ } else {
+ switch (default_layer) {
+ case 0:
+ led[0] = led_state.num_lock ? blue : lblue;
+ break;
+ case 1:
+ led[0] = led_state.num_lock ? green : black;
+ break;
+ }
+ }
+
+ led[1] = led_state.caps_lock ? green : black;
+
+ switch (layer) {
+ case 0:
+ case 1:
+ default:
+ led[2] = led_state.scroll_lock ? green : black;
+ break;
+ case 2:
+ led[2] = led_state.scroll_lock ? red : lred;
+ break;
+ case 3:
+ led[2] = led_state.scroll_lock ? turq : lturq;
+ break;
+ }
+ if (!suspend_active) {
+ ws2812_setleds(led, RGBLED_NUM);
+ }
+}
+
+bool led_update_kb(led_t state) {
+ dprintf("LED Update: %d %d %d", led_state.num_lock, led_state.caps_lock, led_state.scroll_lock);
+ led_state = state;
+ led_update_rgb();
+
+ return true;
+}
+
+void update_layer_leds(void) {
+ static uint8_t old_layer = 255;
+ static uint8_t old_default_layer = 255;
+
+ layer = biton32(layer_state);
+ default_layer = biton32(default_layer_state);
+
+ if (isRecording && timer_elapsed(blink_cycle_timer) > 150) {
+ blink_state = !blink_state;
+ blink_cycle_timer = timer_read();
+ old_layer = 255; // fallthrough next check
+ }
+
+ if (layer == old_layer && default_layer == old_default_layer) {
+ return;
+ }
+ old_layer = layer;
+ old_default_layer = default_layer;
+ dprintf("Layer change: %d %d", default_layer, layer);
+ led_update_rgb();
+}
+
+/*****************************************************************************/
+#else // classic LEDs on GPIO
+bool led_update_kb(led_t led_state) {
+ dprintf("LED Update: %d %d %d", led_state.num_lock, led_state.caps_lock, led_state.scroll_lock);
+
+ if (led_update_user(led_state)) {
+ if (!isRecording) writePin(MODELM_LED_NUMLOCK, !led_state.num_lock);
+ writePin(MODELM_LED_CAPSLOCK, !led_state.caps_lock);
+ writePin(MODELM_LED_SCROLLOCK, !led_state.scroll_lock);
+ }
+ return true;
+}
+
+void update_layer_leds(void) {
+ if (isRecording && timer_elapsed(blink_cycle_timer) > 150) {
+ blink_state = !blink_state;
+ blink_cycle_timer = timer_read();
+ writePin(MODELM_LED_NUMLOCK, blink_state);
+ }
+}
+
+#endif
+
+void dynamic_macro_record_start_user(void) {
+ isRecording++;
+ blink_cycle_timer = timer_read();
+}
+
+void dynamic_macro_record_end_user(int8_t direction) {
+ if (isRecording) isRecording--;
+}