skills: How to read DBUMCU correct without debugging

[yqiu.11]

I am useing ADC with STM32H743ZIT6 device.when i debugging,i find that the device can't read DBGMCU vale correct，although I read the 0x5C001000 address directly, i was so confused. Fortunately, I found the following skill.So

 

Step 1 : Download you firmware，you will find that your STM32 device does not printed correct DBGMCU value.

Step 2 : Power down your system.

Step 3 : Power on your system.

Step 4: You will find that your STM32 device has printed correct DBGMCU value.

 

Test code is here（printf is bound with USART1）

int main(void)
{
 CPU_CACHE_Enable();

 HAL_Init();

 SystemClock_Config_PLL_HSI();

 sys_uart1_config();

 uint32_t val = 0;

 val = LL_DBGMCU_GetRevisionID();
 printf("rev val = 0x%08X\r\n", val);

 val = LL_DBGMCU_GetDeviceID();
 printf("dev_val = 0x%08X\r\n", val);

 while(1)
 {
 }
}

So, i think we could not read DBGMCU when debugging.

Best wishes