From cb4ccc74f42bcb0a8f469eb6e21e162dfc98e7b1 Mon Sep 17 00:00:00 2001
From: wdx04 <25487439@qq.com>
Date: Mon, 25 Aug 2025 21:46:19 +0800
Subject: [PATCH 1/2] set MSI clock to RCC_MSIRANGE_0 (48MHz) for STM32U5 after
 wake-up from deep sleep

---
 targets/TARGET_STM/sleep.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/targets/TARGET_STM/sleep.c b/targets/TARGET_STM/sleep.c
index 0ae2e9dcbeb..6a787a1e759 100644
--- a/targets/TARGET_STM/sleep.c
+++ b/targets/TARGET_STM/sleep.c
@@ -98,8 +98,10 @@ __WEAK void ForceOscOutofDeepSleep(void)
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
     RCC_OscInitStruct.MSIState = RCC_MSI_ON;
     RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
-#if defined RCC_MSIRANGE_11
-    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; // Highest freq, 48MHz range
+#if defined (TARGET_STM32U5)
+    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_0; // Highest freq for U5, 48MHz range
+#elif defined (RCC_MSIRANGE_11)
+    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; // Highest freq for L4/L5, 48MHz range
 #else
     RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; // 4MHz range
 #endif

From 33c714395b26f35dc4823ee17302041367be0c40 Mon Sep 17 00:00:00 2001
From: wdx04 <25487439@qq.com>
Date: Tue, 26 Aug 2025 08:30:13 +0800
Subject: [PATCH 2/2] modify the hardcoded HSICalibrationValue(16) to
 RCC_HSICALIBRATION_DEFAULT

---
 targets/TARGET_STM/sleep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/targets/TARGET_STM/sleep.c b/targets/TARGET_STM/sleep.c
index 6a787a1e759..452a3071aeb 100644
--- a/targets/TARGET_STM/sleep.c
+++ b/targets/TARGET_STM/sleep.c
@@ -109,7 +109,7 @@ __WEAK void ForceOscOutofDeepSleep(void)
 #else /* defined RCC_SYSCLKSOURCE_MSI */
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
     RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-    RCC_OscInitStruct.HSICalibrationValue = 16;
+    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
     RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
 #endif /* defined RCC_SYSCLKSOURCE_MSI */