Diff: targets/TARGET_Freescale/TARGET_K20XX/sleep.c

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Freescale/TARGET_K20XX/sleep.c	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,83 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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 ADC is enabled and HS mode is set, if yes disable it (lowers power consumption by 60uA)
+    uint8_t ADC_HSC = 0;
+    if (SIM->SCGC6 & SIM_SCGC6_ADC0_MASK) {
+        if (ADC0->CFG2 & ADC_CFG2_ADHSC_MASK) {
+            ADC_HSC = 1;
+            ADC0->CFG2 &= ~(ADC_CFG2_ADHSC_MASK);
+        }
+    }
+    
+    //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 defined (TARGET_K20D50M)    
+        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;
+#else    
+        // MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 
+        MCG->C1 = MCG_C1_CLKS(2) | MCG_C1_FRDIV(3) | MCG_C1_IRCLKEN_MASK;
+        // MCG->C6: LOLIE=0,PLLS=0,CME=0,VDIV0=0   
+        MCG->C6 = MCG_C6_VDIV0(0);
+        while((MCG->S & MCG_S_OSCINIT0_MASK) == 0u) { } // Check that the oscillator is running 
+        while((MCG->S & 0x0Cu) != 0x08u) { }            // Wait until external reference clock is selected as MCG output 
+        // MCG->C5: PLLCLKEN=0,PLLSTEN=0,PRDIV0=3
+        MCG->C5 = MCG_C5_PRDIV0(5);
+        // MCG->C6: LOLIE=0,PLLS=1,CME=0,VDIV0=3
+        MCG->C6 = MCG_C6_PLLS_MASK | MCG_C6_VDIV0(3);
+        while((MCG->S & 0x0Cu) != 0x08u) { }            // Wait until external reference clock is selected as MCG output         
+        while((MCG->S & MCG_S_PLLST_MASK) == 0u) { }    // Wait until the source of the PLLS clock has switched to the PLL 
+        while((MCG->S & MCG_S_LOCK0_MASK) == 0u) { }    // Wait until locked
+        // MCG->C1: CLKS=0,FRDIV=2,IREFS=0,IRCLKEN=1,IREFSTEN=0
+        MCG->C1 = MCG_C1_FRDIV(2) | MCG_C1_IRCLKEN_MASK;;
+        while((MCG->S & 0x0Cu) != 0x0Cu) { }            // Wait until output of the PLL is selected
+        while((MCG->S & MCG_S_LOCK0_MASK) == 0u) { }    // Wait until locked             
+#endif
+    }
+    
+    if (ADC_HSC) {
+        ADC0->CFG2 |= (ADC_CFG2_ADHSC_MASK);
+    }
+}