1 files changed, 54 insertions, 0 deletions
diff --git a/keyboard/cluepad/backlight.c b/keyboard/cluepad/backlight.c
new file mode 100644
index 0000000000..c0f8539494
--- /dev/null
+++ b/keyboard/cluepad/backlight.c
@@ -0,0 +1,54 @@
+#include <avr/io.h>
+#include "backlight.h"
+#include "led.h"
+
+#include "print.h"
+
+int pwm_level;
+
+void led_set(uint8_t usb_led)
+{
+    print("led_set\n");
+}
+
+void init_backlight_pin(void)
+{
+    // Set C7 to output
+    DDRC |= (1<<7);
+
+    // Initialize the timer
+    TC4H = 0x03;
+    OCR4C = 0xFF;
+    TCCR4A = 0b10000010;
+    TCCR4B = 0b00000001;
+}
+
+void backlight_set(uint8_t level)
+{
+    // Determine the PWM level
+    switch (level)
+    {
+        case 0:
+            // 33%
+            pwm_level = 0x54;
+            break;
+        case 1:
+            // 66%
+            pwm_level = 0xA8;
+            break;
+        case 2:
+            // 100%
+            pwm_level = 0xFF;
+            break;
+        case 3:
+            // 0%
+            pwm_level = 0x00;
+            break;
+        default:
+            xprintf("Unknown level: %d\n", level);
+    }
+
+    // Write the PWM level to the timer
+    TC4H = pwm_level >> 8;
+    OCR4A = 0xFF & pwm_level;
+}