1 files changed, 82 insertions, 0 deletions
diff --git a/led.c b/led.c
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+++ b/led.c
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+/*
+Copyright 2021 Robin Haberkorn <robin.haberkorn@googlemail.com>
+
+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 <stdint.h>
+
+#include <avr/io.h>
+
+#include "debug.h"
+#include "keyclick.h"
+#include "led.h"
+#include "pwm.h"
+
+void led_set(uint8_t usb_led)
+{
+    dprintf("Set keyboard LEDs: 0x%02X\n", usb_led);
+
+    /*
+     * All LEDs and the buzzer are output pins obviously, even for PWM operation
+     */
+    DDRD |= 0b00001111;
+    DDRB |= 0b11110000;
+
+    /* LED right next to the Capslock key (C99) */
+    if (usb_led & (1 << USB_LED_CAPS_LOCK))
+        PORTD &= ~(1 << PD3);
+    else
+        PORTD |= (1 << PD3);
+
+    /*
+     * 1st LED on first row (G00).
+     *
+     * NOTE: This will automatically disable PWM mode, so it will not
+     * interfere with timer 0 and tmk's timer module.
+     */
+    pwm_pd0_set_led(usb_led & (1 << USB_LED_NUM_LOCK) ? 255 : 0);
+
+    /* 2nd LED on first row (G01): Highlight keyclick mode. */
+    pwm_pb7_set_led(keyclick_mode*255/(KEYCLICK_MAX-1));
+
+    /* 3rd LED on the first row (G02) */
+    pwm_pd1_set_led(usb_led & (1 << USB_LED_COMPOSE) ? 255 : 0);
+
+    /*
+     * 4th LED (G03) are currently not triggerable via USB.
+     * Could be triggered as the "backlight".
+     */
+    pwm_pb6_set_led(0);
+
+    /* 5th LED on the first row (G04) */
+    pwm_pb4_set_led(usb_led & (1 << USB_LED_SCROLL_LOCK) ? 255 : 0);
+
+    /*
+     * 6th LED on the first row (G53).
+     *
+     * Triggering this LED (PD2) will also enable the buzzer (PB5),
+     * so we have got a way to beep from userspace (see ./k7637-beep.sh).
+     *
+     * The original firmware also had the error display on G53
+     * (cf. Betriebsdokumentation).
+     */
+    if (usb_led & (1 << USB_LED_KANA)) {
+        PORTD &= ~(1 << PD2);
+        pwm_pb5_set_tone(2200);
+    } else {
+        PORTD |= (1 << PD2);
+        pwm_pb5_set_tone(0);
+    }
+}