stm32_reset_cause.cpp File Reference

Detailed Description

Get Reset Cause for STM32 MCUs.

Date

Dec 10, 2023

Author

Andrey Belomutskiy, (c) 2012-2023

andreika prome.nosp@m.theu.nosp@m.s.pcb.nosp@m.@gma.nosp@m.il.co.nosp@m.m

Definition in file stm32_reset_cause.cpp.

Functions
static Reset_Cause_t	readMCUResetCause ()
Reset_Cause_t	getMCUResetCause ()
const char *	getMCUResetCause (Reset_Cause_t cause)

Variables
static const volatile Reset_Cause_t	resetCause = readMCUResetCause()

Function Documentation

getMCUResetCause() [1/2]

Reset_Cause_t getMCUResetCause

(

)

Definition at line 77 of file stm32_reset_cause.cpp.

                                 {
    return resetCause;
}

getMCUResetCause() [2/2]

const char * getMCUResetCause

(

Reset_Cause_t

cause

)

Definition at line 81 of file stm32_reset_cause.cpp.

                                                  {
    switch (cause) {
    case Reset_Cause_IWatchdog:
        return "Independent hardware watchdog";
    case Reset_Cause_WWatchdog:
        return "Window watchdog";
    case Reset_Cause_Soft_Reset:
        return "NVIC_SystemReset or by debugger";
    case Reset_Cause_NRST_Pin:
        return "Reset from NRST pin";
    case Reset_Cause_POR:
        return "Power on/power-down reset";
    case Reset_Cause_Illegal_Mode:
        return "Reset after illegal Stop, Standby or Shutdown mode entry";
    case Reset_Cause_BOR:
        return "BOR reset";
    case Reset_Cause_Firewall:
        return "Firewall reset";
    case Reset_Cause_Option_Byte:
        return "Option byte load reset";
    default:
        return "Unknown";
    }
}

readMCUResetCause()

static Reset_Cause_t readMCUResetCause ( )

static

Definition at line 36 of file stm32_reset_cause.cpp.

                                         {
#ifdef STM32H7XX
    uint32_t cause = RCC->RSR; // Read the Reset Status Register
    // keep reset reason visible to main app
#ifndef EFI_BOOTLOADER
    // Clear reset flags for future reset detection
    RCC->RSR |= RCC_RSR_RMVF;
#endif
#else
    uint32_t cause = RCC->CSR; // Read the Control/Status Register
    // keep reset reason visible to main app
#ifndef EFI_BOOTLOADER
    // Clear reset flags for future reset detection
    RCC->CSR |= RCC_CSR_RMVF;
#endif
#endif
 
    if (cause & BORRSTF) {
        return Reset_Cause_BOR;
    } else if (cause & PORRSTF) {
        return Reset_Cause_POR;
    } else if (cause & SFTRSTF) {
        return Reset_Cause_Soft_Reset;
    } else if (cause & IWDGRSTF) {
        return Reset_Cause_IWatchdog;
    } else if (cause & WWDGRSTF) {
        return Reset_Cause_WWatchdog;
    } else if (cause & LPWRRSTF) {
        return Reset_Cause_Illegal_Mode;
    } else if (cause & PINRSTF) {
        // See STM32 datasheet "Simplified diagram of the reset circuit"
        // All internal resets happens through driving NRST pin low
        // This cause rise of PINRSTF bit in CSR register
        return Reset_Cause_NRST_Pin;
    }
    return Reset_Cause_Unknown;
}

Variable Documentation

resetCause

const volatile Reset_Cause_t resetCause = readMCUResetCause()

static

Definition at line 75 of file stm32_reset_cause.cpp.

Referenced by checkIfResetLoop(), and getMCUResetCause().

Go to the source code of this file.