STM32G431rbt6 firmware isn't working after reset

[ADovn.1]

I've designed a board with stm32G431 MCU (i will include schematic if necessary) and now trying to test how it works. I am using CMSIS for programming and wrote the most simple blink program (LEDs are on PB3-6):

#include "stm32g431xx.h"
 
void delay(uint32_t time);
 
uint32_t someVar = 0;
 
int main(void)
{
 
	RCC->AHB2ENR |= RCC_AHB2ENR_GPIOBEN;
 
	GPIOB->MODER &= ~0x00003FC0;
	GPIOB->MODER |= 0x0001540;
	GPIOB->ODR |= 0x0078;
 
	while ( 1 )
	{
		delay(300000);
		GPIOB->ODR ^= 0x0078;
 
		someVar += 1;
 
	}
}
 
void delay(uint32_t time)
{
	for ( uint32_t i = 0; i < time; ++i );
}

And when I debug it. It works just fine, but after I hit reset it doesn't work anymore. I checked with st-link utility. The program is still in flash. Can anyone explain what is going on and how to fix it?

[ADovn.1]

Disassembly shows some weird stuff in the beginning. 

[Tesla DeLorean]

Yeah, that would be the vector table, a list of addresses, and not executable code you can disassemble.

​

Odd the FLASH basis isn't 0x08000000, but not my part.

​

Make sure your design pulls BOOT0 low.​

[ADovn.1]

In my design PB8 is used as GPIO and it has logic high without MCU setup. I tried to use:

FLASH->SEC1R |= FLASH_SEC1R_BOOT_LOCK;

But it hadn't helped yet. Sorry for comment duplication

[ADovn.1]

In my design PB8 is used as GPIO and it has logic high without MCU setup. I tried to use:

FLASH->SEC1R |= FLASH_SEC1R_BOOT_LOCK;

But it hadn't helped yet.

[ADovn.1]

Ok, I Fixed it. Problem was with boot0 as @Community member​  sad.

It is important to know that in my project pb8 (boot0 pin) is used as GPIO, and from the board design it is high without setups. So when I reset my board it was trying to boot from the SRAM (which is not what I wanted) so, to fix it is needed to setup MCU to always boot from Flesh. Which in my case was made as:

	// 	Wait until flash is not busy anymore
	while((FLASH->SR & FLASH_SR_BSY) == FLASH_SR_BSY){}
 
	//	Unlock flash memmory
	FLASH->KEYR = 0x45670123;
	FLASH->KEYR = 0xCDEF89AB;
 
	FLASH->OPTKEYR = 0x08192A3B;
	FLASH->OPTKEYR = 0x4C5D6E7F;
 
	// Disable boot pin
	FLASH->OPTR &= ~FLASH_OPTR_nSWBOOT0;
 
	// Enable new steup
	FLASH->CR |= FLASH_CR_OPTSTRT;
 
	// Lock flash back
	FLASH->CR |= FLASH_CR_OPTLOCK; 
	FLASH->CR |= FLASH_CR_LOCK; 

All boot options are listed in stm32g4 Reference Manual in chapter 2.6