Diff: util/MCUResetReason.cpp

Revision:

10:02e481a80843

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/MCUResetReason.cpp	Wed Mar 29 00:42:12 2017 +0000
@@ -0,0 +1,125 @@
+#include "MCUResetReason.hpp"
+
+/**
+  * System Reset Status Register 0 (RCM_SRS0) 0x4007_F000
+  *
+  * bit[7] : POR         Power-On Reset
+  * bit[6] : PIN         External Reset Pin
+  * bit[5] : WDOG        Watchdog
+  * bit[4] : (Reserved)
+  * bit[3] : LOL         Loss-of-Lock Reset
+  * bit[2] : LOC         Loss-of-Clock Reset
+  * bit[1] : LVD         Low-Voltage Detect Reset
+  * bit[0] : WAKEUP      Low Leakage Wakeup Reset
+  */
+#define REG_RCM_SRS0    (uint8_t *)0x4007F000
+#define POR_RESET_BIT   0x80
+#define PIN_RESET_BIT   0x40
+#define WDG_RESET_BIT   0x20
+#define LOL_RESET_BIT   0x08
+#define LOC_RESET_BIT   0x04
+#define LVD_RESET_BIT   0x02
+#define WUP_RESET_BIT   0x01
+  /**
+   * System Reset Status Register 1 (RCM_SRS1) 0x4007_F001
+   *
+   * bit[7:6] (Reserved)
+   * bit[5] : SACKERR     Stop Mode Acknowledge Error Reset
+   * bit[4] : (Reserved)
+   * bit[3] : MDM_AP      MDM-AP System Reset Request
+   * bit[2] : SW          Software Reset
+   * bit[1] : LOCKUP      Core Lockup
+   * bit[0] : (Reserved)
+   */
+#define REG_RCM_SRS1     (uint8_t *)0x4007F001
+#define SACK_RESET_BIT   0x20
+#define MDM_RESET_BIT    0x08
+#define SW_RESET_BIT     0x04
+#define LOCKUP_RESET_BIT 0x02
+ 
+/**
+ * Software Reset
+ * 
+ * From Cortex-M0 Devices Generic User Guide
+ * 4.3.4 Application Interrupt and Reset Control Register
+ *
+ * Bit[31:16] : VECTCKEY
+ * Bit[15]    : ENDIANESS
+ * Bit[14:3]  : (Reserved)
+ * Bit[2]     : SYSRESETREQ
+ * Bit[1]     : VECTCLRACTIVE (reserved for debug use)
+ * Bit[0]     : (Reserved)
+ *
+ * Note: To trigger software reset, both VECTKEY=0x05FA and SYSRESETREQ
+ * must be written at once, therefore the value will be
+ * 0x05FA0004
+ */
+
+MCUResetReason *self = NULL;
+
+const char *MCUResetReason::str_reset_reason[] = {
+    "Power On Reset",
+    "External Pin Reset",
+    "Watch Dog Reset : Forgot to feed?",
+    "Loss of Lock Reset",
+    "Loss of Clock Reset",
+    "Low-Voltage Detect Reset",
+    "Low Leakage Wakeup Reset",
+    "Stop Mode Acknowledge Error Reset",
+    "MDM-AP System Reset Request",
+    "Software Reset",
+    "Core Lockup Reset"
+};
+
+MCUResetReason::MCUResetReason()
+{
+    SRS[0] = *REG_RCM_SRS0 ;
+    SRS[1] = *REG_RCM_SRS1 ;
+}
+
+MCUResetReason* MCUResetReason::ref()
+{
+    return self != NULL ? self : self = new MCUResetReason();
+}
+
+void MCUResetReason::clearFlag()
+{
+    SRS[0] = PIN_RESET_BIT;
+    SRS[1] = 0;
+}
+
+MCUResetReason::RESET_REASON MCUResetReason::getResetReason(void)
+{
+    RESET_REASON reason;
+       
+    if (SRS[0] & POR_RESET_BIT) {
+        reason = POWER_ON;
+    } else if (SRS[0] & PIN_RESET_BIT) {
+        reason = EXTERNAL_PIN;
+    } else if (SRS[0] & WDG_RESET_BIT) {
+        reason = WATCHDOG;
+    } else if (SRS[0] & LOL_RESET_BIT) {
+        reason = LOSS_OF_LOCK;
+    } else if (SRS[0] & LOC_RESET_BIT) {
+        reason = LOSS_OF_CLOCK;
+    } else if (SRS[0] & LVD_RESET_BIT) {
+        reason = LOW_VOLTAGE_DETECT;
+    } else if (SRS[0] & WUP_RESET_BIT) {
+        reason = LOW_LEAKAGE_WAKEUP;
+    } else if (SRS[1] & SACK_RESET_BIT) {
+        reason = STOP_MODE_ACK_ERROR;
+    } else if (SRS[1] & MDM_RESET_BIT) {
+        reason = MDM_AP_SYSTEM_RESET_REQUEST;
+    } else if (SRS[1] & SW_RESET_BIT) {
+        reason = SOFTWARE;
+    } else if (SRS[1] & LOCKUP_RESET_BIT) {
+        reason = CORE_LOCKUP;
+    }
+    return reason;
+}
+
+const char* MCUResetReason::getResetReasonStr()
+{
+    return str_reset_reason[getResetReason()];
+}
+ 
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