another test

keyboards/clueboard/17/17.c

@@ -0,0 +1,43 @@
+#include "quantum.h"
+
+int pwm_level;
+
+void backlight_init_ports(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;
+}