From 6d402fe3932ac04ff939379e6520322476f683dc Mon Sep 17 00:00:00 2001
From: Henrik Berg <henrik1965@gmail.com>
Date: Wed, 12 Jul 2023 15:16:56 +0200
Subject: [PATCH] RP: Don't reset RTC in Clock::init. Updated example.

---
 embassy-rp/src/clocks.rs   |  2 ++
 examples/rp/src/bin/rtc.rs | 26 +++++++++-----------------
 2 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/embassy-rp/src/clocks.rs b/embassy-rp/src/clocks.rs
index ddd61d224..acb21dce5 100644
--- a/embassy-rp/src/clocks.rs
+++ b/embassy-rp/src/clocks.rs
@@ -308,6 +308,7 @@ pub(crate) unsafe fn init(config: ClockConfig) {
     // - QSPI (we're using it to run this code!)
     // - PLLs (it may be suicide if that's what's clocking us)
     // - USB, SYSCFG (breaks usb-to-swd on core1)
+    // - RTC (else there would be no more time...)
     let mut peris = reset::ALL_PERIPHERALS;
     peris.set_io_qspi(false);
     // peris.set_io_bank0(false); // might be suicide if we're clocked from gpin
@@ -317,6 +318,7 @@ pub(crate) unsafe fn init(config: ClockConfig) {
     // TODO investigate if usb should be unreset here
     peris.set_usbctrl(false);
     peris.set_syscfg(false);
+    peris.set_rtc(false);
     reset::reset(peris);
 
     // Disable resus that may be enabled from previous software
diff --git a/examples/rp/src/bin/rtc.rs b/examples/rp/src/bin/rtc.rs
index 2ddde3257..d569f598f 100644
--- a/examples/rp/src/bin/rtc.rs
+++ b/examples/rp/src/bin/rtc.rs
@@ -4,7 +4,6 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_rp::pac::rtc::regs::{Rtc0, Rtc1};
 use embassy_rp::rtc::{DateTime, DayOfWeek, Rtc};
 use embassy_time::{Duration, Timer};
 use {defmt_rtt as _, panic_probe as _};
@@ -14,22 +13,18 @@ async fn main(_spawner: Spawner) {
     let p = embassy_rp::init(Default::default());
     info!("Wait for 20s");
 
-    let mut watchdog = embassy_rp::watchdog::Watchdog::new(p.WATCHDOG);
     let mut rtc = Rtc::new(p.RTC);
 
-    let rtc0 = Rtc0(watchdog.get_scratch0());
-    let rtc1 = Rtc1(watchdog.get_scratch1());
-    if rtc1.year() >= 2020 {
-        rtc.restore(rtc1, rtc0);
-    } else {
+    if !rtc.is_running() {
+        info!("Start RTC");
         let now = DateTime {
-            year: 2020,
-            month: 5,
-            day: 15,
-            day_of_week: DayOfWeek::Monday,
-            hour: 10,
-            minute: 30,
-            second: 50,
+            year: 2000,
+            month: 1,
+            day: 1,
+            day_of_week: DayOfWeek::Saturday,
+            hour: 0,
+            minute: 0,
+            second: 0,
         };
         rtc.set_datetime(now).unwrap();
     }
@@ -41,9 +36,6 @@ async fn main(_spawner: Spawner) {
             "Now: {}-{:02}-{:02} {}:{:02}:{:02}",
             dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
         );
-        let (rtc1, rtc0) = rtc.save();
-        watchdog.set_scratch0(rtc0.0);
-        watchdog.set_scratch1(rtc1.0);
     }
 
     info!("Reboot.");