STM32f407 accessing internal flash

[netstv]

Posted on November 04, 2015 at 23:08

I'm using the Keil v4 IDE/Toolchain

IDE-Version:�Vision V4.70.0.0Tool Version Numbers:Toolchain:        MDK-ARM Professional  Version: 4.70.0.0The STM32F407VET6 is my full version.  So I have 512MB flash.My image size is only about 120MB.  So I want to use the last 256MB for flash storage.  As I understand it, the first sectors are 4 - 16K sectors, 1-64K sector, and 3 - 128K sectors.My problem is this.  I want to write data to the flash @ 0x08006000.  My snip of code that I want to have this work is:

int main(void)

{    // GPIO_InitTypeDef  GPIO_InitStructure;    /*!< At this stage the microcontroller clock setting is already configured to         168 MHz, this is done through SystemInit() function which is called from         startup file (startup_stm32f4xx.s) before to branch to application main.         To reconfigure the default setting of SystemInit() function, refer to         system_stm32f4xx.c file       */       FLASH_Status flash_status;                 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_6, VoltageRange_3);        if(flash_status == FLASH_COMPLETE)            FLASH_ProgramWord(EEpromCheckByte,EEPROM_MAGIC);        FLASH_Lock();}As I step from the SystemInit (from the startup_stm32f4xx.s) the FLASH->SR = 0x000000C0So I MUST be doing something wrong in the Keil startup?  I've done this before on other ST's and it works fine.  I never had to do anything special.What am I missing?Thanks.-stv #rewrite #stm32f #flash

[Tesla DeLorean]

Posted on November 05, 2015 at 01:11

My problem is this.  I want to write data to the flash @ 0x08006000

0x08060000 ?? FLASH_Sector_7 The defines might be helpful. All the F407 parts have 1MB of FLASH on die

[netstv]

Posted on November 09, 2015 at 18:49Sorry didn't put the defines.... I'm using the header file  stm32f4xx_flash.hFor the Voltage and flash sector.#define VoltageRange_1        ((uint8_t)0x00)  /*!< Device operating range: 1.8V to 2.1V */#define VoltageRange_2        ((uint8_t)0x01)  /*!<Device operating range: 2.1V to 2.7V */#define VoltageRange_3        ((uint8_t)0x02)  /*!<Device operating range: 2.7V to 3.6V */#define VoltageRange_4        ((uint8_t)0x03)  /*!<Device operating range: 2.7V to 3.6V + External Vpp *//** @defgroup FLASH_Sectors  * @{  */ #define FLASH_Sector_0     ((uint16_t)0x0000) /*!< Sector Number 0 */#define FLASH_Sector_1     ((uint16_t)0x0008) /*!< Sector Number 1 */#define FLASH_Sector_2     ((uint16_t)0x0010) /*!< Sector Number 2 */#define FLASH_Sector_3     ((uint16_t)0x0018) /*!< Sector Number 3 */#define FLASH_Sector_4     ((uint16_t)0x0020) /*!< Sector Number 4 */#define FLASH_Sector_5     ((uint16_t)0x0028) /*!< Sector Number 5 */#define FLASH_Sector_6     ((uint16_t)0x0030) /*!< Sector Number 6 */#define FLASH_Sector_7     ((uint16_t)0x0038) /*!< Sector Number 7 */#define FLASH_Sector_8     ((uint16_t)0x0040) /*!< Sector Number 8 */#define FLASH_Sector_9     ((uint16_t)0x0048) /*!< Sector Number 9 */#define FLASH_Sector_10    ((uint16_t)0x0050) /*!< Sector Number 10 */#define FLASH_Sector_11    ((uint16_t)0x0058) /*!< Sector Number 11 */Here are the other defines...#define ADDR_SECTOR_6 0x08060000const u32 EEpromCheckByte  __attribute__((at(ADDR_SECTOR_6))) = 0; // EEprom check byte u32 EEPROM_MAGIC = 0x73736767;Maybe I have an outdated data sheet (STM32F407x.pdf) says in Chapter 7 the ''E'' of the part number STM32F407VET6  means 512MB flash.But I think it has something to do with my Keil setup.  Because once I jump from the SystemInit() into main(), that error bit is flipped.  I'm using the Keil debugger.. Maybe I'm locking the memory somehow?  In some weird setting?Thanks 

[Tesla DeLorean]

Posted on November 09, 2015 at 18:56

Your defines, I have the ST ones

EEpromCheckByte, EEPROM_MAGIC, etc You shouldn't leave the main() function, put a while(1); in there so it doesn't exit. The debugger will interfere with the Flash controller, but you seem to clear the flags. I'd compile the code, but obviously I can't. They sell versions with 256KB, and 512KB tested, but all the die have 1MB. It costs a lot in tester time to validate the memory. ie I can test 4x 256KB parts in the time it would take for 1x 1MB, and the costs are passed along.

[Tesla DeLorean]

Posted on November 09, 2015 at 19:00

Crossed on the wire, but your still have the sector number wrong

#define FLASH_Sector_0     ((uint16_t)0x0000) /*!< Sector Number 0  0x08000000*/ #define FLASH_Sector_1     ((uint16_t)0x0008) /*!< Sector Number 1  0x08004000 */ #define FLASH_Sector_2     ((uint16_t)0x0010) /*!< Sector Number 2  0x08008000 */ #define FLASH_Sector_3     ((uint16_t)0x0018) /*!< Sector Number 3  0x0800C000 */ #define FLASH_Sector_4     ((uint16_t)0x0020) /*!< Sector Number 4  0x08010000 */ #define FLASH_Sector_5     ((uint16_t)0x0028) /*!< Sector Number 5  0x08020000 */ #define FLASH_Sector_6     ((uint16_t)0x0030) /*!< Sector Number 6  0x08040000 */ #define FLASH_Sector_7     ((uint16_t)0x0038) /*!< Sector Number 7  0x08060000 */ #define FLASH_Sector_8     ((uint16_t)0x0040) /*!< Sector Number 8  0x08080000 */ #define FLASH_Sector_9     ((uint16_t)0x0048) /*!< Sector Number 9  0x080A0000 */ #define FLASH_Sector_10    ((uint16_t)0x0050) /*!< Sector Number 10 0x080C0000 */ #define FLASH_Sector_11    ((uint16_t)0x0058) /*!< Sector Number 11 0x080E0000 */