STM32F4

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Option byte programming

The STM32F4 series devices provide some option bytes which allow some "permanent" configuration as well as readout protection for the device. Unfortunately, the option bytes become effective immediately when programmed. This means when enabling the read protection of the device via option bytes, the programmer will immediately lose the access to the flash, without any possibility to verify the complete flash operation. Therefore, the option bytes cannot be programmed as part of the flash image. The sequence, to program the option bytes consists of multiple read / write accesses to special function registers of the STM32F4 MCU.

Via J-Flash / Flasher ARM

The sequence to program the option bytes, needs to be added to the exit-steps of the J-Flash project. The exit steps will be executed at the end of an successful auto-programming process (Target -> Auto). J-Flash comes with an example project for the STM32F405OE which contains the option byte programming sequence (File:STM32F405OE OptBytes.jflash). This sequence applies for all STM32F2 / F4 devices since they are compatible regarding option byte programming and can be adapted to fit custom requirements. The option byte values are transmitted in the step which writes the OPTCR.

Wiki-STM32F4 OptionByteProg.png

STM32F446xx (Q)SPI support

The ST STM32F446xx device series comes with a QUADSPI controller which allows memory mapped read accesses to any (Q)SPI flash, connected to the Quad-SPI interface of the MCU. This allows the J-Link DLL to support flash programming through the Quad-SPI interface. Unfortunately, there is no generic way how to implement flash programming because the used pins to connect the SPI flash is not defined but different pins can be used for the same QUADSPI alternate function and therefore, for each configuration, a slightly different RAMCode (different pin initialization / flash size) is required. We have developed a flash algorithm, which allows to program any common (Q)SPI flash, connected to the Quad-SPI interface of the ST STM32F446 device. The flash algorithm is based on the Open Flash Loader concept so it can easily exchanged if a pin configuration, different from the one used in the example flash algorithm, is required. In such cases, please get in touch with SEGGER directly (support@segger.com).

Example implementation

As described above, the reference flash algorithm is based on the Open Flash Loader and therefore needs to be added manually using a JLinkDevices.xml file. An example JLinkDevices.xml entry as well as the used pinout in the example flash algorithm is given below. This example assumes a Winbond W25Q16DV (2MB flash) connected to the Quad-SPI interface of the STM32F446xx. For further information regarding the Open Flash Loader and how to use the JLinkDevices.xml file, please refer to the J-Link User Manual (UM08001), chapter 10 Open Flash Loader.

Quad-SPI interface pins

The example algorithm uses the following port pins to interface the (Q)SPI flash.

Alternate function Port / Pin
QUADSPI_BK1_IO0 PF8
QUADSPI_BK1_IO1 PF9
QUADSPI_BK1_IO2 PE2
QUADSPI_BK1_IO3 PF6
QUADSPI_CLK PB2
QUADSPI_BK1_NCS PG6

JLinkDevices.xml

<Database>
  <Device>
    <ChipInfo Vendor="ST"
              Name="STM32F446ZE"
              WorkRAMAddr="0x20000000"
              WorkRAMSize="0x18000"
              Core="JLINK_CORE_CORTEX_M4" />
    <FlashBankInfo Name="Internal Flash"
                   BaseAddr="0x90000000"
                   MaxSize="0x200000"
                   Loader="ST_STM32F446_Reference.elf"
                   LoaderType="FLASH_ALGO_TYPE_OPEN" />
  </Device>
</Database>

Flash algorithm (*.elf)

This file contains the program routines used by the J-Link DLL during flash programming.

IAR example project

The example project contains a simple counter loop which is linked into the (Q)SPI flash memory region @ address 0x90000000. The project includes the JLinkDevices.xml file as well as the ST_STM32F446_Reference.elf. It runs out-of-the-box. Please note, that IAR EWARM must at least use the J-Link DLL version V6.01a, which supports the Open Flash Loader.

STM32F469xx (Q)SPI support

The ST STM32F469xx device series comes with a QUADSPI controller which allows memory mapped read accesses to any (Q)SPI flash, connected to the Quad-SPI interface of the MCU. This allows the J-Link DLL to support flash programming through the Quad-SPI interface. Unfortunately, there is no generic way how to implement flash programming because the used pins to connect the SPI flash is not defined but different pins can be used for the same QUADSPI alternate function and therefore, for each configuration, a slightly different RAMCode (different pin initialization / flash size) is required. We have developed a flash algorithm, which allows to program any common (Q)SPI flash, connected to the Quad-SPI interface of the ST STM32F469 device. The flash algorithm is based on the Open Flash Loader concept so it can easily exchanged if a pin configuration, different from the one used in the example flash algorithm, is required. In such cases, please get in touch with SEGGER directly (support@segger.com).

Example implementation

As described above, the reference flash algorithm is based on the Open Flash Loader and therefore needs to be added manually using a JLinkDevices.xml file. An example JLinkDevices.xml entry as well as the used pinout in the example flash algorithm is given below. This example assumes a Winbond W25Q16DV (2MB flash) connected to the Quad-SPI interface of the STM32F469xx. For further information regarding the Open Flash Loader and how to use the JLinkDevices.xml file, please refer to the J-Link User Manual (UM08001), chapter 10 Open Flash Loader.

Quad-SPI interface pins

The example algorithm uses the following port pins (as used on the STM32F469I-DISCO board) to interface the (Q)SPI flash.

Alternate function Port / Pin
QUADSPI_BK1_IO0 PF8
QUADSPI_BK1_IO1 PF9
QUADSPI_BK1_IO2 PF7
QUADSPI_BK1_IO3 PF6
QUADSPI_CLK PF10
QUADSPI_BK1_NCS PB6

JLinkDevices.xml

<Database>
  <Device>
   <ChipInfo Vendor="ST" Name="STM32F469NI" Core="JLINK_CORE_CORTEX_M4" />
   <FlashBankInfo Name="QSPI Flash" BaseAddr="0x90000000" MaxSize="0x01000000" Loader="ST_STM32F469I_Disco_QSPI.elf" LoaderType="FLASH_ALGO_TYPE_OPEN" />
  </Device>
</Database>

Flash algorithm (*.elf)

This file contains the program routines used by the J-Link DLL during flash programming.

IAR example project

The example project contains a simple counter loop which is linked into the (Q)SPI flash memory region @ address 0x90000000. The project includes the JLinkDevices.xml file as well as the ST_STM32F469I_Disco_QSPI.elf. It runs out-of-the-box. Please note, that IAR EWARM must at least use the J-Link DLL version V6.01a, which supports the Open Flash Loader.