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воскресенье, 6 сентября 2015 г.

Software RESET fot Cortex & STM32

In the library source file stm32f10x_nvic.c :

#define AIRCR_VECTKEY_MASK    ((u32)0x05FA0000)
/*******************************************************************************
* Function Name  : NVIC_GenerateSystemReset
* Description    : Generates a system reset.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_GenerateSystemReset(void)
{
  SCB->AIRCR = AIRCR_VECTKEY_MASK | (u32)0x04;
}

or

    ldr     r0,=0xE000ED0C ; SCB AIRCR
    ldr     r1,=0x05FA0004
    str     r1, [r0, #0]

Other variant :

SystemReset     PROC
                EXPORT  SystemReset
                ldr     r1, =0xE000ED0C ; NVIC Application Interrupt and Controller
                ldr     r0, =0x05FA0004 ; Magic
                str     r0, [r1, #0]    ; Reset
self            b       self
                bx      lr
                ENDP

Saw a function in core_cm3.h. Didn't use it though.

/*    This function initiate a system reset request to reset the MCU. */
static __INLINE void NVIC_SystemReset(void)
{
  __DSB();                                                     /* Ensure all outstanding memory accesses included
                                                                  buffered write are completed before reset */
  SCB->AIRCR  = ((0x5FA << SCB_AIRCR_VECTKEY_Pos)      |
                 (SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) |
                 SCB_AIRCR_SYSRESETREQ_Msk);                   /* Keep priority group unchanged */
  __DSB();                                                     /* Ensure completion of memory access */
  while(1);                                                    /* wait until reset */
}

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