From a41bc5a7cadb5bea9b7800286b2f4ea4f9b26e1a Mon Sep 17 00:00:00 2001
From: Andrew Leech <andrew.leech@planetinnovation.com.au>
Date: Wed, 23 Feb 2022 09:37:48 +1100
Subject: [PATCH] stm32/modmachine: Add deepsleep support to reset_cause() for
 WB55.

---
 ports/stm32/modmachine.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ports/stm32/modmachine.c b/ports/stm32/modmachine.c
index 57b8ef5e6b..0239ea64ca 100644
--- a/ports/stm32/modmachine.c
+++ b/ports/stm32/modmachine.c
@@ -119,6 +119,12 @@ void machine_init(void) {
         reset_cause = PYB_RESET_DEEPSLEEP;
         PWR->SCR |= PWR_SCR_CSBF;
     } else
+    #elif defined(STM32WB)
+    if (PWR->EXTSCR & PWR_EXTSCR_C1SBF) {
+        // came out of standby
+        reset_cause = PYB_RESET_DEEPSLEEP;
+        PWR->EXTSCR |= PWR_EXTSCR_C1CSSF;
+    } else
     #endif
     {
         // get reset cause from RCC flags