when boot0 pin low mode my timer program works fine and get correct delay but after the reset the timer not working and no blink led what are the reasons?

[Msams.1]

boot from flash

Board:Stm32f401ccu6 black phill

these are my upload status

STMicroelectronics ST-LINK GDB server. Version 5.8.0

Copyright (c) 2020, STMicroelectronics. All rights reserved.

Starting server with the following options:

       Persistent Mode           : Disabled

       Logging Level             : 1

       Listen Port Number        : 61234

       Status Refresh Delay      : 15s

       Verbose Mode              : Disabled

       SWD Debug                 : Enabled

Waiting for debugger connection...

Debugger connected

     -------------------------------------------------------------------

                      STM32CubeProgrammer v2.7.0-RC1                 

     -------------------------------------------------------------------

ST-LINK SN : 152719002C135737334D4E00

ST-LINK FW : V2J37S7

Board      : --

Voltage    : 3.22V

SWD freq   : 4000 KHz

Connect mode: Under Reset

Reset mode : Hardware reset

Device ID  : 0x423

Revision ID : --

Device name : STM32F401xB/C

Flash size : 256 KBytes

Device type : MCU

Device CPU : Cortex-M4

Memory Programming ...

Opening and parsing file: ST-LINK_GDB_server_a05628.srec

 File         : ST-LINK_GDB_server_a05628.srec

 Size         : 1256 Bytes

 Address      : 0x08000000

Erasing memory corresponding to segment 0:

Erasing internal memory sector 0

Download in Progress:

File download complete

Time elapsed during download operation: 00:00:00.332

Verifying ...

Download verified successfully

Debugger connection lost.

Shutting down...

my code

#include "stm32f4xx.h"

#define PLLM 25

#define PLLN 320

#define PLLP 1//divide 4

int clock_80MHz_Ex_pll();

int pinMode();

void InitTIM2();

void Delay_us();

void Delay_ms(int x);

int clock_80MHz_Ex_pll()

{

      RCC->CR|=RCC_CR_HSEON;//External Crystal Oscillator

      while(!(RCC->CR & RCC_CR_HSERDY));// External Crystal oscillator status flag checking

      RCC->APB1ENR|=RCC_APB1ENR_PWREN;// power Enable

      PWR->CR|=PWR_CR_VOS;// voltage scaling

      FLASH->ACR|=(FLASH_ACR_DCEN|FLASH_ACR_ICEN|FLASH_ACR_PRFTEN|FLASH_ACR_LATENCY_2WS);

      RCC->CFGR|=(RCC_CFGR_PPRE2_DIV1|RCC_CFGR_PPRE1_DIV2|RCC_CFGR_HPRE_DIV1);

      RCC->PLLCFGR|=(PLLM<<0|PLLN<<6|PLLP<<16|1<<22);

      RCC->CR|=RCC_CR_PLLON;

      while(!(RCC->CR & RCC_CR_PLLRDY));

      RCC->CFGR|=RCC_CFGR_SW_PLL;

      while(!(RCC->CFGR & RCC_CFGR_SWS_PLL));

       return 1;

}

int pinMode()

{

  RCC->AHB1ENR|=RCC_AHB1ENR_GPIOCEN;

  GPIOC->MODER|=0x55555555;

  GPIOC->OTYPER=0;

  GPIOC->OSPEEDR=0;

  return 0;

}

void InitTIM2()

{

   RCC->APB1ENR|=(1<<0);//Enable timer 2

   TIM2->PSC =80+1;

   TIM2->ARR=0xFFFF;

   TIM2->CR1 |=(1<<0);

}

void Delay_us()

{

   TIM2->CNT=0;

   while(TIM2->CNT < 1000);

}

void Delay_ms(int x)

{

   for(int i=0;i<x;i++){

   Delay_us();}

}

int main()

{

clock_80MHz_Ex_pll();

pinMode();

InitTIM2();

while(1){

   GPIOC->ODR=(1<<13);

   Delay_ms(1000);

   GPIOC->ODR=~(1<<13);

   Delay_ms(1000);

   }

return 0;

}

[TDK]

>  TIM2->PSC =80+1;

>  TIM2->ARR=0xFFFF;

If your timer clock is 80 MHz, your timer ticks at a rate of 1 tick per 1.025us (80 MHz / 82).

Because of this, your delay_us() will wait for 1 ms (technically 1.025ms, plus overhead). And your delay_ms(1000) will wait for 1000 seconds.

If you want 1 timer tick per us, PSC should be 79.

[Msams.1]

@tdk
My problem is when uploaded my led blink+ timer code​ which is working fine.but I reconnected that board or reset the board the delay not showing the led constantly turn on. Look at when I upload the code I press button of the boot0 pin.

[TDK]

BOOT0 needs to be pulled down to run user code.

[Msams.1]

> Hi, I have another questions could you clarify them for me?
I have mentioned the boot configuration details here.
Consider situation 1,I uploaded the program into mcu through boot from
fash memory.
Consider situation 2,I uploaded the program into mcu through boot from
system memory.
My doubt is the both programming method store the program on the same
memory location or different location?

[TDK]

How are you doing the uploads exactly? STM32CubeIDE?

Generally things upload to the start of flash memory by default, although this is a choice.

You can use STM32CubeProgrammer to verify the content of the flash.

[Msams.1]

Sir I have another doubt?
I will give you two different situations?
1st.i uploaded my cobe on stm32 through system Boot loader method.
2nd .I uploaded my code on stm32 through flash memory boot mode.
My doubt is both methods store the main code in same memory block or another?
For example
System memory booting stored main code in 0x8000000.such as flash memory stored in 0x 8000000.

[Tesla DeLorean]

Can't you look at whatever code you're running in the second case.

For the ROM based system loader you pass the address as part of the protocol. The host application usually infers this from the addresses in the .HEX or .ELF file, or you input via the user interface.​ The linker builds these object files based on addresses you furnish.

D​o you work with anyone more experienced who can help you with all these doubts, or help you review documentation, or provide appropriate training?