Posted on April 02, 2014 at 17:53 This worked for me, in Keil on an STM32F4-DISCO
// STM32F4 FLASH - sourcer32@gmail.com
#include <
stdio.h
>
#include ''stm32f4xx.h''
/**************************************************************************************/
#define FLASH_CFG_ULONGS 512
int save_data_to_flash(unsigned long *data)
{
FLASH_Status flash_status;
volatile uint32_t *addr = (volatile uint32_t *)0x0800C000; // Sector 3 0x0800C000 .. 0x0800FFFF
int x;
flash_status = FLASH_COMPLETE;
FLASH_Unlock();
FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR |FLASH_FLAG_WRPERR |
FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
flash_status = FLASH_EraseSector(FLASH_Sector_3, VoltageRange_3);
if (flash_status != FLASH_COMPLETE)
{
FLASH_Lock();
return(66); // ERR_BAD_ERASE
}
for(x=0; x<
FLASH_CFG_ULONGS
; x++)
{
if (*addr != 0xFFFFFFFF) // Not blank
return(99);
//program first run status bit
flash_status
=
FLASH_ProgramWord
((uint32_t)addr, *data);
if (flash_status != FLASH_COMPLETE)
{
printf(''ProgramWord fails @ %08X, status:%d\n'', (uint32_t)addr, flash_status);
FLASH_Lock();
return((int)flash_status);
}
addr++;
data++;
}
return(-1);
}
/**************************************************************************************/
int main(void)
{
int i;
puts(''FLASH Test'');
for(
i
=
0
; i<3; i++)
printf(''#%d - save_data_to_flash status:%d\n'', i, save_data_to_flash((void *)(0x1FFF0000 + (FLASH_CFG_ULONGS * sizeof(unsigned long) * i))) );
while(1); // Don't want to exit
}
//******************************************************************************
// Hosting of stdio functionality through SWV - Serial Wire Viewer
//******************************************************************************
#include <rt_misc.h>
#pragma import(__use_no_semihosting_swi)
struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;
int fputc(int ch, FILE *f)
{
ITM_SendChar(ch);
return(ch);
}
int fgetc(FILE *f)
{
char ch;
ch = '?';
return((int)ch);
}
int ferror(FILE *f)
{
/* Your implementation of ferror */
return EOF;
}
void _ttywrch(int ch)
{
ITM_SendChar(ch);
}
void _sys_exit(int return_code)
{
label: goto label; /* endless loop */
}
//******************************************************************************
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
//******************************************************************************
I don't understand the merits of having the address variable being global, sets you up for failure on multiple calls.
