From 94d90742dd02a7d4350a5f712baa81a3ee105fa9 Mon Sep 17 00:00:00 2001
From: DavePutz <dwputz@gmail.com>
Date: Sat, 4 Jul 2020 21:15:38 -0500
Subject: [PATCH] Implementation of RTC continuous synchronization during
 pulsein

Flags and code to implement RTC continuous synchronization during pulsein
---
 ports/atmel-samd/common-hal/pulseio/PulseIn.c | 10 ++++++++++
 ports/atmel-samd/common-hal/pulseio/PulseIn.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/ports/atmel-samd/common-hal/pulseio/PulseIn.c b/ports/atmel-samd/common-hal/pulseio/PulseIn.c
index 7ea20321b2..b825579dbe 100644
--- a/ports/atmel-samd/common-hal/pulseio/PulseIn.c
+++ b/ports/atmel-samd/common-hal/pulseio/PulseIn.c
@@ -125,6 +125,9 @@ void pulsein_interrupt_handler(uint8_t channel) {
 }
 
 void pulsein_reset() {
+#ifdef SAMD21
+    rtc_end_pulsein();
+#endif
     refcount = 0;
     pulsein_tc_index = 0xff;
     overflow_count = 0;
@@ -221,6 +224,10 @@ void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t* self,
 
     // Set config will enable the EIC.
     pulsein_set_config(self, true);
+#ifdef SAMD21
+    rtc_start_pulsein();
+#endif
+
 }
 
 bool common_hal_pulseio_pulsein_deinited(pulseio_pulsein_obj_t* self) {
@@ -231,6 +238,9 @@ void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t* self) {
     if (common_hal_pulseio_pulsein_deinited(self)) {
         return;
     }
+#ifdef SAMD21
+    rtc_end_pulsein();
+#endif
     set_eic_handler(self->channel, EIC_HANDLER_NO_INTERRUPT);
     turn_off_eic_channel(self->channel);
     reset_pin_number(self->pin);
diff --git a/ports/atmel-samd/common-hal/pulseio/PulseIn.h b/ports/atmel-samd/common-hal/pulseio/PulseIn.h
index 89b61a83ac..99358178f2 100644
--- a/ports/atmel-samd/common-hal/pulseio/PulseIn.h
+++ b/ports/atmel-samd/common-hal/pulseio/PulseIn.h
@@ -50,5 +50,11 @@ void pulsein_reset(void);
 
 void pulsein_interrupt_handler(uint8_t channel);
 void pulsein_timer_interrupt_handler(uint8_t index);
+#ifdef SAMD21
+void rtc_set_continuous(void);
+void rtc_start_pulsein(void);
+void rtc_end_pulsein(void);
+#endif
+
 
 #endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_PULSEIO_PULSEIN_H