Store values in STM32G0 internal flash

[Himanshu Saxena]

(was initially a reply to https://community.st.com/t5/stm32-mcus-products/store-values-in-internal-flash/m-p/666974

I am store variable in flash adders and after reset read but variable values is not store in flash adders.& using stm32g030f6p6 microcontroller and here is my code:-

void flash unlock(void)

{

 FLASH->KEYR = 0x45670123;

 FLASH->KEYR = 0xCDEF89AB;

}

void Erase_Flash(void)

{

 //HRTIM1->sMasterRegs.MICR |= 0x51;  /*clear pending bit*/

 // HRTIM1->sMasterRegs.MDIER = HRTIM_MASTER_IT_NONE; /*DISABLE HRTIMER INTERRUPT*/

  flash_unlock();

   Delay(200); 

 /*if((FLASH->CR &0x80)== 0x80)

 {

  flash_unlock();

  delay2(200);

 }

 else*/

 {

  SET_BIT(FLASH->CR, FLASH_CR_PER);  

    Delay(200); 

  FLASH->WRP1AR = 0x08000500;

    Delay(200); 

  FLASH->CR |= 0x40;

  FLASH->WRP1AR = 0x08000800;

    Delay(200); 

  FLASH->CR |= 0x40;

  /* FLASH->WRP1AR = 0x08007C10;

    Delay(200); 

  FLASH->CR |= 0x40;

  FLASH->WRP1AR = 0x08007C14;

    Delay(200); 

  FLASH->CR |= 0x40;

    Delay(200); */

  CLEAR_BIT(FLASH->CR, FLASH_CR_PER);   

 } 

 // HRTIM1->sMasterRegs.MDIER = HRTIM_MDIER_MUPDIE;  /*ENABLE HRTIMER INTERRUPT*/ 

} 

void flash_write(void)

{

 // HRTIM1->sMasterRegs.MICR |= 0x51;  /*clear pending bit*/

 // HRTIM1->sMasterRegs.MDIER = HRTIM_MASTER_IT_NONE; /*DISABLE HRTIMER INTERRUPT*/

 Erase_Flash();   

 //HRTIM1->sMasterRegs.MICR |= 0x51;  /*clear pending bit*/

 //HRTIM1->sMasterRegs.MDIER = HRTIM_MASTER_IT_NONE; /*DISABLE HRTIMER INTERRUPT*/

 /*if((FLASH->CR &0x80)== 0x80)

 {

  flash_unlock();

  delay2(200);

 }

 else*/

 {

  //flash_unlock();

    Delay(10000); 

  SET_BIT(FLASH->CR, FLASH_CR_PG);  

    Delay(10000); 

  *(__IO uint16_t*)0x08000500 = 596; ///PV_cal

    Delay(10000); 

  *(__IO uint16_t*)0x08000800 = 456; ///BV_cal

    Delay(10000); 

 /* *(__IO uint16_t*)0x08007C10 = VAR3; //BI_cal

    Delay(10000); 

  *(__IO uint16_t*)0x08007C14 = VAR4; //Induct_cal

    Delay(10000); 

  *(__IO uint16_t*)0x08007C18 = VAR5; //Induct_cal

    Delay(10000); 

  // *(__IO uint16_t*)0x08007C1C = 0xAD; //first time

   Delay(10000); */

  CLEAR_BIT(FLASH->CR, FLASH_CR_PG);  

 }  

 // HRTIM1->sMasterRegs.MDIER = HRTIM_MDIER_MUPDIE;  /*ENABLE HRTIMER INTERRUPT*/  

}

void flash(void)

 {  

 VAR1  = *(__IO uint16_t*)0x08000500;

  Delay(20); 

 VAR2  = *(__IO uint16_t*)0x08000800;

  Delay(20); 

 /* VAR3  = *(__IO uint16_t*)0x08007C10;

  Delay(20); 

 VAR4 = *(__IO uint16_t*)0x08007C14;

  Delay(20); 

  VAR5 = *(__IO uint16_t*)0x08007C18;

  Delay(20); 

  //First = *(__IO uint16_t*)0x08007C1C;

   Delay(20); */

}

[Tesla DeLorean · Accepted solution]

Use </> code formatting tool to post source code.

Add comments

Does library code work? Low addresses likely to contain the executing code, can't just erase 

[TDK]

It looks like you're trying to erase individual sections of flash, but your code is misguided and won't work. Perhaps go from a HAL example.

Look at how flash operates--particularly that you can only erase an entire sector at a time.

Also note that erasing flash that is currently in use by the program will cause your program to stop working.

[Himanshu Saxena]

void flash unlock(void)
{
 FLASH->KEYR = 0x45670123;
 FLASH->KEYR = 0xCDEF89AB;
}
void Erase_Flash(void)
{   flash_unlock();
   Delay(200); 
 /*if((FLASH->CR &0x80)== 0x80)
 {
  flash_unlock();
  delay2(200);
 }
 else*/
 {
  SET_BIT(FLASH->CR, FLASH_CR_PER);  
    Delay(200); 
  FLASH->WRP1AR = 0x08000500;
    Delay(200); 
  FLASH->CR |= 0x40;
  FLASH->WRP1AR = 0x08000800;
    Delay(200); 
  FLASH->CR |= 0x40;
  /* FLASH->WRP1AR = 0x08007C10;
    Delay(200); 
  FLASH->CR |= 0x40;
  FLASH->WRP1AR = 0x08007C14;
    Delay(200); 
  FLASH->CR |= 0x40;
    Delay(200); */
  CLEAR_BIT(FLASH->CR, FLASH_CR_PER);   
 } 
 } 
 
void flash_write(void)
{
  Erase_Flash();   
 /*if((FLASH->CR &0x80)== 0x80)
 {
  flash_unlock();
  delay2(200);
 }
 else*/
 {
  //flash_unlock();
    Delay(10000); 
  SET_BIT(FLASH->CR, FLASH_CR_PG);  
    Delay(10000); 
  *(__IO uint16_t*)0x08000500 = 596; ///PV_cal
    Delay(10000); 
  *(__IO uint16_t*)0x08000800 = 456; ///BV_cal
    Delay(10000); 
 /* *(__IO uint16_t*)0x08007C10 = VAR3; //BI_cal
    Delay(10000); 
  *(__IO uint16_t*)0x08007C14 = VAR4; //Induct_cal
    Delay(10000); 
  *(__IO uint16_t*)0x08007C18 = VAR5; //Induct_cal
    Delay(10000); 
  // *(__IO uint16_t*)0x08007C1C = 0xAD; //first time
   Delay(10000); */
  CLEAR_BIT(FLASH->CR, FLASH_CR_PG);  
 }  
 }
 void flash(void)
 {  
 VAR1  = *(__IO uint16_t*)0x08000500;
  Delay(20); 
 VAR2  = *(__IO uint16_t*)0x08000800;
  Delay(20); 
 /* VAR3  = *(__IO uint16_t*)0x08007C10;
  Delay(20); 
 VAR4 = *(__IO uint16_t*)0x08007C14;
  Delay(20); 
  VAR5 = *(__IO uint16_t*)0x08007C18;
  Delay(20); 
  //First = *(__IO uint16_t*)0x08007C1C;
   Delay(20); */
}

[Himanshu Saxena]

yes when i am erase flasg entire program is stop working , may be my flash adders is not correct or correct ,please refer any addears to replace it.