Added functions and example for deep sleep on mb851.

The added function let a process to make the system go
into deep sleep for maximum power saving.
The udp-ipv6-example shows how to use these new functions.

cpu/stm32w108/Makefile.stm32w108

@@ -18,7 +18,7 @@ CONTIKI_CPU_DIRS = . dev hal simplemac hal/micro/cortexm3 hal/micro/cortexm3/stm
 
 STM32W_C = leds-arch.c leds.c clock.c watchdog.c uart1.c uart1-putchar.c slip_uart1.c slip.c\
 		stm32w-radio.c stm32w_systick.c uip_arch.c rtimer-arch.c adc.c micro.c sleep.c \
-		micro-common.c micro-common-internal.c clocks.c mfg-token.c nvm.c flash.c rand.c
+		micro-common.c micro-common-internal.c clocks.c mfg-token.c nvm.c flash.c rand.c system-timer.c
 
 STM32W_S = spmr.s79 context-switch.s79 
 

cpu/stm32w108/clock.c

@@ -45,8 +45,14 @@
 #include "hal/hal.h"
 #include "dev/stm32w_systick.h"
 
-#include "sys/clock.h"
-#include "sys/etimer.h"
+#include "contiki.h"
+
+#include "uart1.h"
+#include "dev/leds.h"
+#include "dev/stm32w-radio.h"
+
+#define DEBUG DEBUG_NONE
+#include "net/uip-debug.h"
 
 // The value that will be load in the SysTick value register.
 #define RELOAD_VALUE 24000-1   // 1 ms with a 24 MHz clock
@@ -77,9 +83,9 @@ void SysTick_Handler(void)
 void clock_init(void)
 { 
   
-  INTERRUPTS_OFF();
-  
-  //Counts the number of ticks.  
+  ATOMIC(
+
+  //Counts the number of ticks.
   count = 0;
   
   SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
@@ -87,7 +93,8 @@ void clock_init(void)
   SysTick_ITConfig(ENABLE);
   SysTick_CounterCmd(SysTick_Counter_Enable);
   
-  INTERRUPTS_ON();
+  )
+
 }
 
 /*---------------------------------------------------------------------------*/
@@ -128,3 +135,51 @@ unsigned long clock_seconds(void)
 {
   return current_seconds;
 }
+
+#include <stdio.h>
+
+void sleep_seconds(int seconds)
+{
+  int32u quarter_seconds = seconds * 4;
+  uint8_t radio_on;
+
+
+  halPowerDown();
+  radio_on = stm32w_radio_is_on();
+  stm32w_radio_driver.off();
+
+  halSleepForQsWithOptions(&quarter_seconds, 0);
+
+
+  ATOMIC(
+
+  halPowerUp();
+
+  // Update OS system ticks.
+  current_seconds += seconds - quarter_seconds / 4 ; // Passed seconds
+  count += seconds * CLOCK_SECOND - quarter_seconds * CLOCK_SECOND / 4 ;
+
+  if(etimer_pending()) {
+    etimer_request_poll();
+  }
+
+  SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
+  SysTick_SetReload(RELOAD_VALUE);
+  SysTick_ITConfig(ENABLE);
+  SysTick_CounterCmd(SysTick_Counter_Enable);
+
+  )
+
+  stm32w_radio_driver.init();
+  if(radio_on){
+	  stm32w_radio_driver.on();
+  }
+
+  uart1_init(115200);
+  leds_init();
+  rtimer_init();
+
+  PRINTF("WakeInfo: %04x\r\n", halGetWakeInfo());
+
+
+}

cpu/stm32w108/dev/stm32w-radio.c

@@ -395,7 +395,11 @@ static int stm32w_radio_on(void)
   
   return 1;
 }
-
+/*---------------------------------------------------------------------------*/
+int stm32w_radio_is_on(void)
+{
+  return onoroff == ON;
+}
 /*---------------------------------------------------------------------------*/
 
 
@@ -512,7 +516,7 @@ PROCESS_THREAD(stm32w_radio_process, ev, data)
       NETSTACK_RDC.input();
     }
     if(!RXBUFS_EMPTY()){
-      // Some data packet still in rx buffer (this appens because process_poll doesn't queue requests),
+      // Some data packet still in rx buffer (this happens because process_poll doesn't queue requests),
       // so stm32w_radio_process need to be called again.
       process_poll(&stm32w_radio_process);
     }

cpu/stm32w108/dev/stm32w-radio.h

@@ -53,5 +53,7 @@ short last_packet_rssi();
 
 extern const struct radio_driver stm32w_radio_driver;
 
+int stm32w_radio_is_on(void);
+
 
 #endif /* __STM32W_H__ */

cpu/stm32w108/sleep.h

@@ -0,0 +1,10 @@
+
+/* Enter system in deep sleep 1 (core power domain is fully
+ * powered down and sleep timer is active).
+ * Execution is suspended for a given number of seconds.
+ *
+ * Pay attention! All system peripherals (including sensors) have
+ * to be reinitialized before being used again. UART, LEDs and
+ * real timers are automatically reinitialized. */
+
+void sleep_seconds(int seconds);