Merge pull request #1684 from hichard/master

add rt_hw_cpu_reset for cortex-m cpu

libcpu/arm/cortex-m3/cpuport.c

@@ -110,6 +110,8 @@ void rt_hw_exception_install(rt_err_t (*exception_handle)(void* context))
 #define SCB_HFSR        (*(volatile const unsigned *)0xE000ED2C) /* HardFault Status Register */
 #define SCB_MMAR        (*(volatile const unsigned *)0xE000ED34) /* MemManage Fault Address register */
 #define SCB_BFAR        (*(volatile const unsigned *)0xE000ED38) /* Bus Fault Address Register */
+#define SCB_AIRCR       (*(volatile unsigned long *)0xE000ED0C)  /* Reset control Address Register */
+#define SCB_RESET_VALUE 0x05FA0004                               /* Reset value, write to SCB_AIRCR can reset cpu */
 
 #define SCB_CFSR_MFSR   (*(volatile const unsigned char*)0xE000ED28)  /* Memory-management Fault Status Register */
 #define SCB_CFSR_BFSR   (*(volatile const unsigned char*)0xE000ED29)  /* Bus Fault Status Register */
@@ -352,6 +354,14 @@ void rt_hw_cpu_shutdown(void)
     RT_ASSERT(0);
 }
 
+/**
+ * reset CPU
+ */
+RT_WEAK void rt_hw_cpu_reset(void)
+{
+    SCB_AIRCR = SCB_RESET_VALUE;
+}
+
 #ifdef RT_USING_CPU_FFS
 /**
  * This function finds the first bit set (beginning with the least significant bit)

libcpu/arm/cortex-m4/cpuport.c

@@ -187,6 +187,8 @@ void rt_hw_exception_install(rt_err_t (*exception_handle)(void *context))
 #define SCB_HFSR        (*(volatile const unsigned *)0xE000ED2C) /* HardFault Status Register */
 #define SCB_MMAR        (*(volatile const unsigned *)0xE000ED34) /* MemManage Fault Address register */
 #define SCB_BFAR        (*(volatile const unsigned *)0xE000ED38) /* Bus Fault Address Register */
+#define SCB_AIRCR       (*(volatile unsigned long *)0xE000ED0C)  /* Reset control Address Register */
+#define SCB_RESET_VALUE 0x05FA0004                               /* Reset value, write to SCB_AIRCR can reset cpu */
 
 #define SCB_CFSR_MFSR   (*(volatile const unsigned char*)0xE000ED28)  /* Memory-management Fault Status Register */
 #define SCB_CFSR_BFSR   (*(volatile const unsigned char*)0xE000ED29)  /* Bus Fault Status Register */
@@ -431,6 +433,14 @@ void rt_hw_cpu_shutdown(void)
     RT_ASSERT(0);
 }
 
+/**
+ * reset CPU
+ */
+RT_WEAK void rt_hw_cpu_reset(void)
+{
+    SCB_AIRCR = SCB_RESET_VALUE;
+}
+
 #ifdef RT_USING_CPU_FFS
 /**
  * This function finds the first bit set (beginning with the least significant bit)

libcpu/arm/cortex-m7/cpuport.c

@@ -187,6 +187,8 @@ void rt_hw_exception_install(rt_err_t (*exception_handle)(void *context))
 #define SCB_HFSR        (*(volatile const unsigned *)0xE000ED2C) /* HardFault Status Register */
 #define SCB_MMAR        (*(volatile const unsigned *)0xE000ED34) /* MemManage Fault Address register */
 #define SCB_BFAR        (*(volatile const unsigned *)0xE000ED38) /* Bus Fault Address Register */
+#define SCB_AIRCR       (*(volatile unsigned long *)0xE000ED0C)  /* Reset control Address Register */
+#define SCB_RESET_VALUE 0x05FA0004                               /* Reset value, write to SCB_AIRCR can reset cpu */
 
 #define SCB_CFSR_MFSR   (*(volatile const unsigned char*)0xE000ED28)  /* Memory-management Fault Status Register */
 #define SCB_CFSR_BFSR   (*(volatile const unsigned char*)0xE000ED29)  /* Bus Fault Status Register */
@@ -431,6 +433,14 @@ void rt_hw_cpu_shutdown(void)
     RT_ASSERT(0);
 }
 
+/**
+ * reset CPU
+ */
+RT_WEAK void rt_hw_cpu_reset(void)
+{
+    SCB_AIRCR = SCB_RESET_VALUE;
+}
+
 #ifdef RT_USING_CPU_FFS
 /**
  * This function finds the first bit set (beginning with the least significant bit)