[M2351] Fix hal_deepsleep with serial_can_deep_sleep

Add secure functions CLK_PowerDown_S/CLK_Idle_S

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M2351/device/stddriver_secure.c

@@ -197,6 +197,18 @@ void SYS_UnlockReg_S(void)
     SYS_UnlockReg();
 }
 
+__NONSECURE_ENTRY
+void CLK_Idle_S(void)
+{
+    CLK_Idle();
+}
+
+__NONSECURE_ENTRY
+void CLK_PowerDown_S(void)
+{
+    CLK_PowerDown();
+}
+
 static bool check_mod_ns(int modclass, uint32_t modidx)
 {
     const nu_modidx_ns_t *modidx_ns = modidx_ns_tab;

targets/TARGET_NUVOTON/TARGET_M2351/device/stddriver_secure.h

@@ -71,6 +71,14 @@ void SYS_LockReg_S(void);
 __NONSECURE_ENTRY
 void SYS_UnlockReg_S(void);
 
+/* Secure CLK_Idle */
+__NONSECURE_ENTRY
+void CLK_Idle_S(void);
+
+/* Secure CLK_PowerDown */
+__NONSECURE_ENTRY
+void CLK_PowerDown_S(void);
+
 #ifdef __cplusplus
 }
 #endif

targets/TARGET_NUVOTON/TARGET_M2351/sleep.c

@@ -24,27 +24,29 @@
 #include "PeripheralPins.h"
 #include <stdbool.h>
 
-#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
-
 #if DEVICE_SERIAL
 bool serial_can_deep_sleep(void);
 #endif
 
 /**
  * Enter idle mode, in which just CPU is halted.
  */
-__NONSECURE_ENTRY
 void hal_sleep(void)
 {
+#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
     SYS_UnlockReg();
     CLK_Idle();
     SYS_LockReg();
+#else
+    SYS_UnlockReg_S();
+    CLK_Idle_S();
+    SYS_LockReg_S();
+#endif
 }
 
 /**
  * Enter power-down mode, in which HXT/HIRC are halted.
  */
-__NONSECURE_ENTRY
 void hal_deepsleep(void)
 {
 #if DEVICE_SERIAL
@@ -53,10 +55,15 @@ void hal_deepsleep(void)
     }
 #endif
 
+#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
     SYS_UnlockReg();
     CLK_PowerDown();
     SYS_LockReg();
+#else
+    SYS_UnlockReg_S();
+    CLK_PowerDown_S();
+    SYS_LockReg_S();
+#endif
 }
 
 #endif
-#endif