Merge pull request #938 from bridadan/lpc11U68Sleep

Add sleep and deepsleep for LPC11U68. Needs testing on board

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11U6X/device.h

@@ -44,7 +44,7 @@
 #define DEVICE_SEMIHOST         0
 #define DEVICE_LOCALFILESYSTEM  0
 
-#define DEVICE_SLEEP            0
+#define DEVICE_SLEEP            1
 
 #define DEVICE_DEBUG_AWARENESS  0
 

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11U6X/sleep.c

@@ -0,0 +1,69 @@
+/* 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"
+#include "mbed_interface.h"
+
+#if DEVICE_SLEEP
+
+void sleep(void) {
+
+#if (DEVICE_SEMIHOST == 1)
+    // ensure debug is disconnected
+    mbed_interface_disconnect();
+#endif
+
+    // PCON[PM] (bits 2:0) set to 0
+    LPC_PMU->PCON &= ~0x03;
+
+    // SRC[SLEEPDEEP] set to 0 = sleep
+    SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
+
+    // wait for interrupt
+    __WFI();
+}
+
+
+void deepsleep(void) {
+
+#if (DEVICE_SEMIHOST == 1)
+    // ensure debug is disconnected
+    mbed_interface_disconnect();
+#endif
+
+  // PCON[PM] (bits 2:0) set to 1
+  LPC_PMU->PCON &= ~0x03;
+  LPC_PMU->PCON |= 0x01;
+
+  //According to user manual it is kinda picky about reserved bits, so we follow that nicely
+  //Keep WDOSC and BOD in same state as they are now during deepsleep
+  LPC_SYSCON->PDSLEEPCFG = 0x00000037 | (LPC_SYSCON->PDRUNCFG & (0x00000048));
+
+  // Power up same as before powerdown
+  LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
+
+  // All interrupts can wake
+  LPC_SYSCON->STARTERP0 = 0xFF;
+  LPC_SYSCON->STARTERP1 = 0xFFFFFFFF;
+
+  // SRC[SLEEPDEEP] set to 1 = deep sleep
+  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
+
+  // wait for interrupt
+  __WFI();
+}
+
+#endif