ProgramPage

int ProgramPage(
  unsigned long adr,         /*  Page start address  */
  unsigned long sz,          /*  Page size           */
  unsigned char *buf);       /*  Data                */

The ProgramPage function is used to write the code into the Flash memory. It is invoked whenever an attempt is made to download the program to Flash.

The ProgramPage function returns a value:

• 0 - on success.
• 1 - on failure.

int ProgramPage (unsigned long adr, unsigned long sz, unsigned char *buf) {

  sz = (sz + 1) & ~1;                           // Adjust size for Half Words

  while (sz) {

    FLASH->CR |=  FLASH_PG;                     // Programming Enabled

    M16(adr) = *((unsigned short *)buf);        // Program Half Word
    while (FLASH->SR & FLASH_BSY);

    FLASH->CR &= ~FLASH_PG;                     // Programming Disabled

    // Check for Errors
    if (FLASH->SR & (FLASH_PGERR | FLASH_WRPRTERR)) {
      FLASH->SR |= FLASH_PGERR | FLASH_WRPRTERR;
      return (1);                               // Failed
    }

    // Go to next Half Word
    adr += 2;
    buf += 2;
    sz  -= 2;

  }

  return (0);                                   // Done
}

Complete example exists in folder \KEIL\ARM\FLASH\STM32F10x.