Question
PGAERR error on every second Flash programming attempt (STM32L496)
Hello,
I am trying to use this code to save a 332 byte (83 double word) long data to the STM32L496 flash memory. For some unknown reason, every second time I call the function, I encounter a PGAERR. The third time it works fine, but the fourth time it fails again, and so on.
#define FP_ADDRESS 0x080FF000
#define FP_PAGE 510
void Diag_SavePVD()
{
__disable_irq();
/* 0. Erase error flags */
if (FLASH->SR & (FLASH_SR_PGSERR | FLASH_SR_PROGERR | FLASH_SR_WRPERR))
FLASH->SR |=(FLASH_SR_PGSERR | FLASH_SR_PROGERR | FLASH_SR_WRPERR);
/* 1. Flash Unlock */
FLASH->KEYR = 0x45670123;
FLASH->KEYR = 0xCDEF89AB;
/* 2. Flash page erase */
while (FLASH->SR & FLASH_SR_BSY);
FLASH->CR &= ~FLASH_CR_PG;
FLASH->CR |= FLASH_CR_PER | ((FP_ADDRESS >= 0x08100000) ? FLASH_CR_BKER : 0);
FLASH->CR &= ~FLASH_CR_PNB_Msk;
FLASH->CR |= (FP_PAGE << FLASH_CR_PNB_Pos);
FLASH->CR |= FLASH_CR_STRT;
while (FLASH->SR & FLASH_SR_BSY);
FLASH->CR &= ~FLASH_CR_PER;
/* 3. Flash programming */
FLASH->CR |= FLASH_CR_PG;
register __IO uint32_t * dst = (__IO uint32_t*)FP_ADDRESS,
* src=(__IO uint32_t*)&PortData.PVD;
for (register uint32_t size = sizeof(PortData.PVD) / sizeof(uint32_t), c = 0; size--;)
{
while (FLASH->SR & FLASH_SR_BSY);
printf("Write cycle %u: %Xh (%p->%p)\r\n", ++c, FLASH->SR, src, dst);
*dst++ = *src++;
}
while (FLASH->SR & FLASH_SR_BSY);
FLASH->CR &=~FLASH_CR_PG;
/* 4. Flash lock */
FLASH->CR |= FLASH_CR_LOCK;
__enable_irq();
}
Console output:
First run:
Write cycle 1: 0h (0x20004192->0x80ff000)
Write cycle 2: 0h (0x20004196->0x80ff004)
Write cycle 3: 0h (0x2000419a->0x80ff008)
Write cycle 4: 0h (0x2000419e->0x80ff00c)
...
Second run:
Write cycle 1: 0h (0x20004192->0x80ff000)
Write cycle 2: 20h (0x20004196->0x80ff004)
Write cycle 3: A0h (0x2000419a->0x80ff008)
Write cycle 4: A0h (0x2000419e->0x80ff00c)
...
Third run:
Write cycle 1: 0h (0x20004192->0x80ff000)
Write cycle 2: 0h (0x20004196->0x80ff004)
Write cycle 3: 0h (0x2000419a->0x80ff008)
Write cycle 4: 0h (0x2000419e->0x80ff00c)
Thank you for your help.