WIP: redo power sequence

src/arch/8051/delay.c

@@ -9,14 +9,19 @@ void delay_ticks(uint16_t ticks) {
     timer_stop();
 }
 
-// One millisecond in ticks is determined as follows:
-//   9.2 MHz is the clock rate
-//   The timer divider is 12
-//   The timer rate is 12 / 9.2 MHz = 1.304 us
-//   The ticks are 1000 ms / (1.304 us) = 766.667
-//   65536 - 766.667 = 64769.33
+// 1 us * 9.2 MHz / 12 is 69/90
+// Warning: this will round to the nearest tick
+#define delay_us(X) \
+    delay_ticks((uint16_t)((((uint32_t)(X)) * 69UL + 89UL) / 90UL));
+
+// 1 ns * 9.2 MHz / 12 is 69/90000
+// Warning: this will round to the nearest tick
+#define delay_ns(X) \
+    delay_ticks((uint16_t)((((uint32_t)(X)) * 69UL + 89999UL) / 90000UL));
+
+// This loops through delays of one ms in order to avoid overflow
 void delay_ms(int ms) {
     for (int i = 0; i < ms; i++) {
-        delay_ticks(767);
+        delay_us(1000);
     }
 }