C33: use 32Khz crystal as RTC source

Author: facchinm

Diff for: libraries/RTC/src/RTC.cpp

@@ -437,18 +437,21 @@ void __attribute__((weak)) rtc_callback(rtc_callback_args_t *p_args) {
   }
 }
 
-rtc_instance_ctrl_t rtc_ctrl;
+rtc_instance_ctrl_t rtc_ctrl = {
+    .open = 0,
+};
+
+#ifndef RTC_CLOCK_SOURCE
+#define RTC_CLOCK_SOURCE RTC_CLOCK_SOURCE_LOCO
+#endif
+
 const rtc_error_adjustment_cfg_t rtc_err_cfg = { 
     .adjustment_mode = RTC_ERROR_ADJUSTMENT_MODE_AUTOMATIC,
     .adjustment_period = RTC_ERROR_ADJUSTMENT_PERIOD_10_SECOND,
     .adjustment_type = RTC_ERROR_ADJUSTMENT_NONE,
     .adjustment_value = 0, };
 rtc_cfg_t rtc_cfg  = { 
-    // TODO: change me to RTC_CLOCK_SOURCE_SUBCLK when capacitors are mounted
-    // https://arduino.atlassian.net/browse/HWH33-204
-    // Fixes counting time in VBAT mode on H33
-    // Leave as is for Santiago
-    .clock_source = RTC_CLOCK_SOURCE_LOCO,
+    .clock_source = RTC_CLOCK_SOURCE,
     .freq_compare_value_loco = 255, 
     .p_err_cfg = &rtc_err_cfg, 
     .alarm_ipl = (12), 
@@ -458,8 +461,7 @@ rtc_cfg_t rtc_cfg  = {
     .carry_ipl = (12),
     .carry_irq = FSP_INVALID_VECTOR,
     .p_callback = rtc_callback,
-    .p_context = NULL, 
-    
+    .p_context = NULL,
 };
 
 #ifdef __cplusplus

Diff for: variants/PORTENTA_C33/pins_arduino.h

@@ -204,4 +204,6 @@ static const uint8_t SS  =  PIN_SPI_CS;
 #define LORA_RESET          2 //PWM2
 #define LORA_BOOT0          3 //PWM3
 #define LORA_IRQ_DUMB       4 //PWM4
-#define SerialLoRa          Serial3
+#define SerialLoRa          Serial3
+
+#define RTC_CLOCK_SOURCE    RTC_CLOCK_SOURCE_SUBCLK