Doing a reset

[mjohansson]

Posted on September 15, 2008 at 07:13

Doing a reset

[mjohansson]

Posted on May 17, 2011 at 12:44

Hello everyone!

I'm using IAR EWARM 5.11 a j-link and a STM32F103VBT6 processor. I've been trying to do a reset. I've tried iwdg, the sysresetreq bit and the hw way by nrst. And they all have a common behaviour, I end up at the HardFault vector. The vector table checks out, the boot0 pin is 0, so, what am I missing?

[mjohansson]

Posted on May 17, 2011 at 12:44

Sorry everyone.

Of course it was programmer error in low_level_init(). :-?

[trevor1]

Posted on May 17, 2011 at 12:44

A good way to reset from software is like so (from the ST firmware library).

Code:

/*******************************************************************************

* 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;

}

[mjohansson]

Posted on May 17, 2011 at 12:44

Thanks. But that was what I meant by ''the sysresetreq bit''.

Still having problems with the reset though, still might be programmer error but I can't find it. It happens when the MCU is switched over from HSI to PLL systemclock. Starting it up once by JTAG works but when doing a reset or running standalone I end up at the HardFault vector when doing the switch from HSI to PLL for system clock. The PLL clock is generated from a HSE clock input (HSEBYP bit set to 1). The RCC_CR and RCC_CFGR both look the same for the first startup and the reset. So what might be different that I'm not noticing?