Tidy in preparation for RTC

firmware/Peripherals.md

@@ -5,14 +5,18 @@
 |*GLCK*|
 ||gclk0|main clock, internal osc8m|4 MHz
 ||gclk1|tcxo clock, fed from xosc
+||gclk2|rtc feed, fed from gclk1. divide by 4096
 
 |*TC*||
-||tc0|telemetry tick timer (has timepulse input)
+||tc0|telemetry tick timer. 32-bit
 ||tc1|^^^^^
 ||tc2|counts cycles of tcxo. 32-bit
 ||tc3|^^^^^
 ||tc4|osc8m event source
-||tc5|pwm 8-bit
+||tc5|telemetry pwm 8-bit
+
+|*RTC*|
+||rtc|telemetry timings
 
 |*event channels*|
 ||0|event source for timer 2 xosc measurement
@@ -26,7 +30,8 @@
 
 ## SAM D20 Interrupts usage
 
-| Name | Function | Notes
+| Name | Function | Priority H(0-3)L | Notes
 | --- | --- | --- | ---
-|TC0_IRQn|
-|TC2_IRQn|xosc measurement done|
+|TC0_IRQn||0
+|TC2_IRQn|xosc measurement done|2
+|[GPS_SERCOM]_IRQn|gps usart rx|0

firmware/src/main.c

@@ -105,8 +105,9 @@ void wdt_init() {
 void powermananger_init(void)
 {
   system_apb_clock_clear_mask(SYSTEM_CLOCK_APB_APBA,
-			      PM_APBAMASK_EIC | /* EIC is unused */
-			      PM_APBAMASK_RTC); /* RTC is unused */
+//			      PM_APBAMASK_EIC | /* EIC is used now */
+//			      PM_APBAMASK_RTC | /* RTC is used now */
+    0);
 }
 
 

firmware/src/telemetry.c

@@ -309,7 +309,6 @@ float timer0_tick_init(float frequency)
   bool t0_capture_channel_enables[]    = {false, false};
   uint32_t t0_compare_channel_values[] = {count, 0x0000};
   tc_init(TC0,
-//	  GCLK_GENERATOR_3,
           GCLK_GENERATOR_0,
 	  TC_COUNTER_SIZE_32BIT,
 	  TC_CLOCK_PRESCALER_DIV1,