Added (deep)sleep

Pretty much copy pasta of KLxx sleep code with only tiny change

libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D5M/device.h

@@ -45,7 +45,7 @@
 #define DEVICE_LOCALFILESYSTEM  0
 #define DEVICE_ID_LENGTH       24
 
-#define DEVICE_SLEEP            0
+#define DEVICE_SLEEP            1
 
 #define DEVICE_DEBUG_AWARENESS  0
 

libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D5M/sleep.c

@@ -0,0 +1,51 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "sleep_api.h"
+#include "cmsis.h"
+
+//Normal wait mode
+void sleep(void)
+{
+    SMC->PMPROT = SMC_PMPROT_AVLLS_MASK | SMC_PMPROT_ALLS_MASK | SMC_PMPROT_AVLP_MASK;
+
+    //Normal sleep mode for ARM core:
+    SCB->SCR = 0;
+    __WFI();
+}
+
+//Very low-power stop mode
+void deepsleep(void)
+{
+    //Check if PLL/FLL is enabled:
+    uint32_t PLL_FLL_en = (MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(0);
+    
+    SMC->PMPROT = SMC_PMPROT_AVLLS_MASK | SMC_PMPROT_ALLS_MASK | SMC_PMPROT_AVLP_MASK;
+    SMC->PMCTRL = SMC_PMCTRL_STOPM(2);
+
+    //Deep sleep for ARM core:
+    SCB->SCR = 1<<SCB_SCR_SLEEPDEEP_Pos;
+
+    __WFI();
+
+    //Switch back to PLL as clock source if needed
+    //The interrupt that woke up the device will run at reduced speed
+    if (PLL_FLL_en) {
+        if (MCG->C6 & (1<<MCG_C6_PLLS_SHIFT) != 0) /* If PLL */
+            while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U); /* Wait until locked */
+        MCG->C1 &= ~MCG_C1_CLKS_MASK;
+    }
+
+}