1 files changed, 94 insertions, 0 deletions
diff --git a/keyboards/bface/backlight_ps2avrGB.c b/keyboards/bface/backlight_ps2avrGB.c
new file mode 100644
index 000000000..c0f642840
--- /dev/null
+++ b/keyboards/bface/backlight_ps2avrGB.c
@@ -0,0 +1,94 @@
+/* Copyright 2017 Sebastian Kaim
+ *
+ * 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/>.
+ */
+
+#ifdef BACKLIGHT_ENABLE
+
+#include "backlight_ps2avrGB.h"
+#define sbi(reg,bit)	reg |= (_BV(bit))
+#define cbi(reg,bit)	reg &= (~_BV(bit))
+#define PWM10	WGM10
+#define PWM11	WGM11
+#define COM1x1 COM1B1
+#define OCR1x  OCR1B
+
+void backlight_init_ports(void)
+{
+#if BACKLIGHT_ON_STATE == 0
+	backlight_off();
+#else
+	backlight_on();
+#endif
+
+	// setup pwm
+	// this bitmagic is sourced from the original firmware
+	/*TCCR1B = ((TCCR1B & ~0x07) | 0x03);
+	TCNT1H = 0;
+	TCNT1L = 0;
+	sbi(TIMSK, TOIE1);
+	OCR1BH = 0;
+	OCR1BL = 0;
+	cbi(TCCR1A,PWM11);
+	sbi(TCCR1A,PWM10);
+	sbi(TCCR1A,COM1B1);
+	cbi(TCCR1A,COM1B0);*/
+	ICR1 = 0xFFFF;
+
+    TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
+    TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
+
+	backlight_init();
+}
+
+void backlight_set(uint8_t level)
+{
+	if( level == 0 ) {
+		backlight_off();
+	}
+	else {
+		backlight_on();
+		/*uint8_t pwm = get_pwm_for_brightness(level);
+		set_backlight_pwm(pwm);
+		TCCR1A |= _BV(COM1x1);
+		OCR1x = (level >= 2) ? 0xFFFF : 0x00FF;*/
+	}
+}
+
+#define PWM_MAX 0xFF
+uint8_t get_pwm_for_brightness(uint8_t level)
+{
+	// we need to cast up here to allow multiplication with 0xFF. We could also use floats, but this is probably a lot faster.
+	uint16_t brightness = (uint16_t)level * (uint16_t)PWM_MAX / (uint16_t)BACKLIGHT_LEVELS;
+	return (uint8_t)brightness;
+}
+
+void backlight_on(void)
+{
+	//_SFR_IO8(0x12) |= _BV(0x4);
+	LED_PIN |= BACKLIGHT_PORT_NUM;
+}
+
+void backlight_off(void)
+{
+	//_SFR_IO8(0x12) &= ~_BV(0x4);
+	LED_PIN &= ~BACKLIGHT_PORT_NUM;
+}
+
+void set_backlight_pwm(uint8_t level) {
+	// this does not work (yet)
+	//OCR1B = level;
+}
+
+#endif // BACKLIGHT_ENABLE