Erasing my Flash on STM32L1 - c

Question

I'm facing a problem with my erasing function.
I try to erase 15 sectors of my Flash in order to put a new binary file.
I don't understand why but my function freeze and i cannot erase all memory i need.
Here is my code if you want to give a try
/*
* bootloader.c
*
* Created on: 9 juin 2015
* Author: tgloaguen
*/
#include "usart.h"
#include "stm32l1xx_flash.h"
#define WRITE_START_ADDR 0x08000000
#define WRITE_END_ADDR 0x0800FFFF
#define FLASH_PAGE_SIZE ((uint16_t)0x100) //If a page is 256 bits
#define MY_BL_FUNCTIONS __attribute__((section(".bootsection")))
void BootLoader(void) MY_BL_FUNCTIONS;
FLASH_Status Flash_Write ( uint32_t StartAddress, uint8_t *p, uint32_t Size ) MY_BL_FUNCTIONS;
uint8_t Flash_Erase() MY_BL_FUNCTIONS;
void Receive_Data(char * buffer,int size)MY_BL_FUNCTIONS;
void Receive_Size(char * buffer, int *sizeData)MY_BL_FUNCTIONS;
void BootLoader(void) {
//clear all ITs
USART_ITConfig( USART1, USART_IT_RXNE, DISABLE );
//SendString("HELLO",USART2);
uint8_t status,i;
char buffer[33];
//en dur
uint16_t *adr = WRITE_START_ADDR;
uint16_t sizeBin = 51400,k = 0,k_hexa = 0x20;
SendString("BOOTLOADER",USART2);
Flash_Erase();
SendString("ERASEOK",USART2);
//if sizeBin ok
}
and the erase function
uint8_t Flash_Erase() {
uint32_t EraseCounter = 0x00, Address = 0x00;//Erase count, write address
uint32_t NbrOfPage = 0x00;//Recording to erase the pages
volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;/*FLASH complete erasure marks*/
/*Unlock FLASH*/
FLASH_Unlock();
/*Calculate the number of FLASH pages need to erase */
NbrOfPage = (WRITE_END_ADDR - WRITE_START_ADDR) / FLASH_PAGE_SIZE;
/* Remove all hang flags */
FLASH_ClearFlag ( FLASH_FLAG_EOP |
FLASH_FLAG_WRPERR |
FLASH_FLAG_PGAERR |
FLASH_FLAG_SIZERR |
FLASH_FLAG_OPTVERR );
/* Erase the FLASH page*/
for(EraseCounter = 0; (EraseCounter <NbrOfPage) && (FLASHStatus == FLASH_COMPLETE); EraseCounter++)
{
SendString("ok |",USART2);
FLASHStatus = FLASH_ErasePage(WRITE_START_ADDR + (FLASH_PAGE_SIZE * EraseCounter));
}
FLASH_Lock ( );
return (uint8_t)FLASHStatus;
}

Answer 1

In your code you are tring to erase the whole flash, but you are executing your bootloader from flash from final sectors.
As reported by th REF man
During a write/erase operation to the NVM (except Half Page programming or Double-word
erase/write), any attempt to read the same bank of NVM stalls the bus.
Then you have to preserve the space of bootloader changing WRITE_END_ADDR define according to your memory map.
Example: if your bootloader is 4K long and belongs to the last sector (0x0801 F000 - 0x0801 FFFF) then WRITE_END_ADDR must be 0x0801 EFFF.
EDIT
As #Olaf wrote take care about your ISP (Initial Stack Pointer) and IPC (Initial Program Counter) that belong to first 8 bytes in your flash at address 0.