Added sleep to LPC81x

http://mbed.org/users/mbed_official/code/mbed-src/pull-request/6

Author: Sissors

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/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_LPC81X/sleep.c

@@ -0,0 +1,82 @@
+/* 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"
+ 
+ 
+//#define DEEPSLEEP
+#define POWERDOWN
+ 
+void sleep(void) {  
+    //Normal sleep mode for PCON:
+    LPC_PMU->PCON &= ~0x03;
+    
+    //Normal sleep mode for ARM core:
+    SCB->SCR = 0;
+    
+    //And go to sleep
+    __WFI();
+}
+ 
+ 
+ 
+//Deepsleep/powerdown modes assume the device is configured to use its internal RC oscillator directly
+ 
+#ifdef DEEPSLEEP
+void deepsleep(void) {
+    //Deep sleep in PCON
+    LPC_PMU->PCON &= ~0x03;
+    LPC_PMU->PCON |= 0x01;
+    
+    //If brownout detection and WDT are enabled, keep them enabled during sleep
+    LPC_SYSCON->PDSLEEPCFG = LPC_SYSCON->PDRUNCFG;
+    
+    //After wakeup same stuff as currently enabled:
+    LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
+    
+    //All interrupts may wake up:
+    LPC_SYSCON->STARTERP0 = 0xFF;
+    LPC_SYSCON->STARTERP1 = 0xFFFF;
+    
+    //Deep sleep for ARM core:
+    SCB->SCR = 1<<2;
+    
+    __WFI();
+}
+#endif
+ 
+#ifdef POWERDOWN
+void deepsleep(void) {
+    //Powerdown in PCON
+    LPC_PMU->PCON &= ~0x03;
+    LPC_PMU->PCON |= 0x02;
+    
+    //If brownout detection and WDT are enabled, keep them enabled during sleep
+    LPC_SYSCON->PDSLEEPCFG = LPC_SYSCON->PDRUNCFG;
+    
+    //After wakeup same stuff as currently enabled:
+    LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
+    
+    //All interrupts may wake up:
+    LPC_SYSCON->STARTERP0 = 0xFF;
+    LPC_SYSCON->STARTERP1 = 0xFFFF;
+    
+    //Deep sleep for ARM core:
+    SCB->SCR = 1<<2;
+    
+    __WFI();
+}
+#endif