1 files changed, 91 insertions, 0 deletions
diff --git a/keyboards/duck/lightsaver/indicator_leds.c b/keyboards/duck/lightsaver/indicator_leds.c
new file mode 100644
index 000000000..0a54e151e
--- /dev/null
+++ b/keyboards/duck/lightsaver/indicator_leds.c
@@ -0,0 +1,91 @@
+/*
+Copyright 2016-2017 Ralf Schmitt <ralf@bunkertor.net> Rasmus Schults <rasmusx@gmail.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 <avr/interrupt.h>
+#include <avr/io.h>
+#include <stdbool.h>
+#include <util/delay.h>
+
+#define T1H  900
+#define T1L  600
+#define T0H  400
+#define T0L  900
+#define RES 6000
+
+#define NS_PER_SEC (1000000000L)
+#define CYCLES_PER_SEC (F_CPU)
+#define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
+#define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
+
+void send_bit_d4(bool bitVal) {
+  if(bitVal) {
+    asm volatile (
+        "sbi %[port], %[bit] \n\t"
+        ".rept %[onCycles] \n\t"
+        "nop \n\t"
+        ".endr \n\t"
+        "cbi %[port], %[bit] \n\t"
+        ".rept %[offCycles] \n\t"
+        "nop \n\t"
+        ".endr \n\t"
+        ::
+        [port]      "I" (_SFR_IO_ADDR(PORTD)),
+        [bit]       "I" (4),
+        [onCycles]  "I" (NS_TO_CYCLES(T1H) - 2),
+        [offCycles] "I" (NS_TO_CYCLES(T1L) - 2));
+  } else {
+    asm volatile (
+        "sbi %[port], %[bit] \n\t"
+        ".rept %[onCycles] \n\t"
+        "nop \n\t"
+        ".endr \n\t"
+        "cbi %[port], %[bit] \n\t"
+        ".rept %[offCycles] \n\t"
+        "nop \n\t"
+        ".endr \n\t"
+        ::
+        [port]      "I" (_SFR_IO_ADDR(PORTD)),
+        [bit]       "I" (4),
+        [onCycles]  "I" (NS_TO_CYCLES(T0H) - 2),
+        [offCycles] "I" (NS_TO_CYCLES(T0L) - 2));
+  }
+}
+
+void show(void) {
+  _delay_us((RES / 1000UL) + 1);
+}
+
+void send_value(uint8_t byte) {
+  for(uint8_t b = 0; b < 8; b++) {
+    send_bit_d4(byte & 0b10000000);
+    byte <<= 1;
+  }
+}
+
+void send_color(uint8_t r, uint8_t g, uint8_t b) {
+  send_value(g);
+  send_value(r);
+  send_value(b);
+}
+
+void indicator_leds_set(bool leds[8]) {
+  cli();
+  send_color(leds[1] ? 255 : 0, leds[2] ? 255 : 0, leds[0] ? 255 : 0);
+  send_color(leds[4] ? 255 : 0, leds[5] ? 255 : 0, leds[3] ? 255 : 0);
+  send_color(leds[6] ? 255 : 0, leds[7] ? 255 : 0, 0);
+  sei();
+  show();
+}