From fa391eed9d2598b05ed7e0e10d38d7b597abcd19 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Tue, 6 Oct 2015 23:39:57 +0100
Subject: [PATCH] stmhal: In RTC.wakeup, fix setting of wucksel to get correct
period.
Thanks to Peter Hinch. See issue #1490.
---
stmhal/rtc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/stmhal/rtc.c b/stmhal/rtc.c
index 00821cabb..91dae0d6e 100644
--- a/stmhal/rtc.c
+++ b/stmhal/rtc.c
@@ -464,7 +464,7 @@ mp_obj_t pyb_rtc_wakeup(mp_uint_t n_args, const mp_obj_t *args) {
// set WUTIE to enable wakeup interrupts
// set WUTE to enable wakeup
// program WUCKSEL
- RTC->CR |= (1 << 14) | (1 << 10) | (wucksel & 7);
+ RTC->CR = (RTC->CR & ~7) | (1 << 14) | (1 << 10) | (wucksel & 7);
// enable register write protection
RTC->WPR = 0xff;
--
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