MCUResetReason.cpp

00001 #include "MCUResetReason.hpp"
00002 
00003 /**
00004   * System Reset Status Register 0 (RCM_SRS0) 0x4007_F000
00005   *
00006   * bit[7] : POR         Power-On Reset
00007   * bit[6] : PIN         External Reset Pin
00008   * bit[5] : WDOG        Watchdog
00009   * bit[4] : (Reserved)
00010   * bit[3] : LOL         Loss-of-Lock Reset
00011   * bit[2] : LOC         Loss-of-Clock Reset
00012   * bit[1] : LVD         Low-Voltage Detect Reset
00013   * bit[0] : WAKEUP      Low Leakage Wakeup Reset
00014   */
00015 #define REG_RCM_SRS0    (uint8_t *)0x4007F000
00016 #define POR_RESET_BIT   0x80
00017 #define PIN_RESET_BIT   0x40
00018 #define WDG_RESET_BIT   0x20
00019 #define LOL_RESET_BIT   0x08
00020 #define LOC_RESET_BIT   0x04
00021 #define LVD_RESET_BIT   0x02
00022 #define WUP_RESET_BIT   0x01
00023   /**
00024    * System Reset Status Register 1 (RCM_SRS1) 0x4007_F001
00025    *
00026    * bit[7:6] (Reserved)
00027    * bit[5] : SACKERR     Stop Mode Acknowledge Error Reset
00028    * bit[4] : (Reserved)
00029    * bit[3] : MDM_AP      MDM-AP System Reset Request
00030    * bit[2] : SW          Software Reset
00031    * bit[1] : LOCKUP      Core Lockup
00032    * bit[0] : (Reserved)
00033    */
00034 #define REG_RCM_SRS1     (uint8_t *)0x4007F001
00035 #define SACK_RESET_BIT   0x20
00036 #define MDM_RESET_BIT    0x08
00037 #define SW_RESET_BIT     0x04
00038 #define LOCKUP_RESET_BIT 0x02
00039  
00040 /**
00041  * Software Reset
00042  * 
00043  * From Cortex-M0 Devices Generic User Guide
00044  * 4.3.4 Application Interrupt and Reset Control Register
00045  *
00046  * Bit[31:16] : VECTCKEY
00047  * Bit[15]    : ENDIANESS
00048  * Bit[14:3]  : (Reserved)
00049  * Bit[2]     : SYSRESETREQ
00050  * Bit[1]     : VECTCLRACTIVE (reserved for debug use)
00051  * Bit[0]     : (Reserved)
00052  *
00053  * Note: To trigger software reset, both VECTKEY=0x05FA and SYSRESETREQ
00054  * must be written at once, therefore the value will be
00055  * 0x05FA0004
00056  */
00057 
00058 MCUResetReason *self = NULL;
00059 
00060 const char *MCUResetReason::str_reset_reason[] = {
00061     "Power On Reset",
00062     "External Pin Reset",
00063     "Watch Dog Reset : Forgot to feed?",
00064     "Loss of Lock Reset",
00065     "Loss of Clock Reset",
00066     "Low-Voltage Detect Reset",
00067     "Low Leakage Wakeup Reset",
00068     "Stop Mode Acknowledge Error Reset",
00069     "MDM-AP System Reset Request",
00070     "Software Reset",
00071     "Core Lockup Reset"
00072 };
00073 
00074 MCUResetReason::MCUResetReason()
00075 {
00076     SRS[0] = *REG_RCM_SRS0 ;
00077     SRS[1] = *REG_RCM_SRS1 ;
00078 }
00079 
00080 MCUResetReason* MCUResetReason::ref()
00081 {
00082     return self != NULL ? self : self = new MCUResetReason();
00083 }
00084 
00085 void MCUResetReason::clearFlag()
00086 {
00087     SRS[0] = PIN_RESET_BIT;
00088     SRS[1] = 0;
00089 }
00090 
00091 MCUResetReason::RESET_REASON MCUResetReason::getResetReason(void)
00092 {
00093     RESET_REASON reason;
00094        
00095     if (SRS[0] & POR_RESET_BIT) {
00096         reason = POWER_ON;
00097     } else if (SRS[0] & PIN_RESET_BIT) {
00098         reason = EXTERNAL_PIN;
00099     } else if (SRS[0] & WDG_RESET_BIT) {
00100         reason = WATCHDOG;
00101     } else if (SRS[0] & LOL_RESET_BIT) {
00102         reason = LOSS_OF_LOCK;
00103     } else if (SRS[0] & LOC_RESET_BIT) {
00104         reason = LOSS_OF_CLOCK;
00105     } else if (SRS[0] & LVD_RESET_BIT) {
00106         reason = LOW_VOLTAGE_DETECT;
00107     } else if (SRS[0] & WUP_RESET_BIT) {
00108         reason = LOW_LEAKAGE_WAKEUP;
00109     } else if (SRS[1] & SACK_RESET_BIT) {
00110         reason = STOP_MODE_ACK_ERROR;
00111     } else if (SRS[1] & MDM_RESET_BIT) {
00112         reason = MDM_AP_SYSTEM_RESET_REQUEST;
00113     } else if (SRS[1] & SW_RESET_BIT) {
00114         reason = SOFTWARE;
00115     } else if (SRS[1] & LOCKUP_RESET_BIT) {
00116         reason = CORE_LOCKUP;
00117     }
00118     return reason;
00119 }
00120 
00121 const char* MCUResetReason::getResetReasonStr()
00122 {
00123     return str_reset_reason[getResetReason()];
00124 }
00125