Program not running on an STM32 microprocessor

Question

I have a problem with our microprocessor.

I had written several programs and I tested them on a STM32vlDiscovery (has stm32f100rbt6 microprocessor.) There were no errors and it worked correctly.

Now I programmed the same program on a new STM32F100RBT6 and unfortunately, the program does not work.

The program was completely downloaded on the STM32 and verified but does not work.

In the debug environment, I saw that all registers were zero, as the microprocessor stopped in the first line of the program.

#include <stm32f10x.h>
#include <math.h>
//------------------
volatile short sinArray[20];
volatile int i=0;

//1000 Hz Sine Wave
void TIM2_IRQHandler(void)
{
    TIM2->SR &=~TIM_SR_UIF;
    DAC->DHR8R1=sinArray[i];
    i++;
    if(i==20)i=0;
}




int main()
{
    RCC->APB1ENR |=RCC_APB1ENR_DACEN;
    DAC->CR |=DAC_CR_EN1;
    RCC->APB1ENR |=RCC_APB1ENR_TIM2EN;
    TIM2->CR1 |=TIM_CR1_ARPE;
    TIM2->ARR=199;
    TIM2->PSC=5;
    TIM2->DIER |=TIM_DIER_UIE;
    NVIC_EnableIRQ(TIM2_IRQn);
    TIM2->CR1 |=TIM_CR1_CEN;
    
    //TIM2->SR &=~TIM_SR_UIF;
    
    
    
    for ( i=0; i<10; i++)
    {
        sinArray[i]=(128*sin(i*3.14/10)+127);
    }
    i=0;


    
    while(1)
    {
    }
}

Answer 1

Connecting BOOT0 to +3.3V which you explained but not shown in the schematics causes the MCU to always go run the factory bootloader after reset, so it will never run the program you programmed.

BOOT0 must be low to run normally.

Also the other issues should be fixed:

-VBAT must not be left unconnected.

-NRST pull-up resistance is unnecessarily low in value. It is not even recommended.