How to write option bytes in stm32. Here is my bank swap function.

How to write option bytes in stm32. I am using `dfu-util` to upload firmware and option bytes.

• How to write option bytes in stm32 pex script file. Required, but never shown According to the STMicroelectronics diagrams, Option Bytes belong to the internal flash memory, but direct access to them is impossible. #define FLASH_OPTOBL (1 << 13) // Start Option Byte Loader and force system reset Your picture of the Keil options is what I would expect from a professional level IDE. However, you should still check what part of your code or programming process is performing an erase. II Set the Options Start (OPTSTRT) bit OPTSTRT in the FLASH_CR register to trigger the update of the option bytes values and wait for the BSY bit of the FLASH_SR register to be cleared. g. When you enable RDP (any level except 0) boot from system flash (ie bootloader) or RAM are disabled. STM32F4 fails to verify after programming with Independent watchdog is enabled in the firmware flashed in the process mentioned above. To do this, the linker script (. bin 0x1FFF7800 4 . , I'm seeing some PCROP and WRP are set. If I set this back to 0xAA (no protection) using STM32CubeProg, flashing is once again possible. Proprietary code readout protection read, write and erase) are strictly prohibited. Note that the STM32F4 apparently goes under the "stm32f2x" command. Reset the device (POR Reset) to reload the option bytes (and the new RDP code) and, to disable the read protection. For any STM32 or. The readout out protection on the STM32F1 family (it is not the case of other STM32 lines) automatically write protect first pages of Flash memory and till we have readout protection active we cannot erase/reprogram those first pages. Utilities. Browse STM32G030 corrupting program on last minute write in STM32 MCUs Products 2024-09-09; Issue to Write/Erase the External Memory using STM32CubeProgrammer in And your code write_register(0x3f, 0xff); does write only one byte. 0. View solution in original post. The command I used in the option byte field was: –ob WRP1A_STRT=0x0 WRP1A_END=0xD . The main Flash memory can be protected against different types of unwanted access (read/write/erase). The STM32 option bytes often vary in capabilities and memory location depending on the exact microcontroller family used. After setting READ protection option byte value = CC (chip protection) I can't program the card anymore. The reload of Option bytes generates a reset of the device but without a power-down. Disable read-out protection stm8s003. This is not visible in the option bytes, so it cannot be removed using write protection option bytes. Checking functionality worked best with STM32 ST-LINK utility CLI for me: > "C:\Program Files (x86)\STMicroelectronics\STM32 ST-LINK Utility\ST-LINK Utility\ST-LINK_CLI. Plus System Workbench is not the tool I planned to use in Programming option bytes on the STM32 using the ST-Link utility. Jerome. If you want to read/write to external memory connected to STM32 via interfaces like SPI, FMC, QSPI, you’ll need an external loader. debug access on this chip, it can never be restored. Ex. Product forums. my Code Doesn't seem to have errors for setting and resetting Option bytes but Nothing Happens when Calling the bank Swap Functions. exe -c port=swd -ob displ’ to view the RDP status. Reset event when entering the. Most STM32 devices come with option bytes that can be modified to influence the device behavior, e. Days ago we have got it working with our serial programmer and we found out the problem was an extra byte in the first communication. 2. Erorr: Expected value for Option Byte "nRST_STDBY": 0x0, found 0x1 Under the MCU core tab, the Core State is "Halted". With option bytes, we had only modified the IWDG_STDBY bit to 0. When the BFB2 option is cleared, the device always boots from Bank 1. The LSB (byte) is sent first. But the steps are not clear for me. Currently, your code fetches data from the address starting from 0x88 and writes it (a total of 256 bytes) to the flash. – Lundin. The "data write" is just a normal write to a address in memory that is the flash memory. hth. I have to set Read out protection without using the stvp programmer. I found that setting the FLASH_CR->OPTSTRT bit *before* writing to the FLASH_OPTR allows the contents to I am asking if RDP and setting the options byte provides a way to disable the system bootloader for good. 9. The Option byte is stored Forums » System Workbench for STM32 » Write option bytes » Write option bytes Write option bytes. In my experience System Workbench is not capable of doing so. A bootloader should be able to read and write to its flash memory. programming process. But AFAIK STM32CubeIDE does never mess with option bytes. If someone has an idea, please share and protected against spurious write/erase operations. The STM32 HAL libraries provide an API for programming and checking the option bytes from application code. The area is defined by a start page offset and an end page offset related to After the transmission of the ACK byte, the bootloader waits for an address (4 bytes, byte 1 is the address MSB and byte 4 is the LSB) and a checksum byte, it then checks the received address. Alternatively, option bytes can be programmed via the Flash registers as shown in the ST STM32 main article. They can be used for permanent store of configuration data for your device. In this post, I will show My S-record had one too many bytes in it (17 instead of 16) - which is another story, but after I fixed that, J-Flash is still unhappy about programming option bytes for the STM32 at the alias address. The file download worked fine but the option byte programming did not seem to take. 3. I would like to enable write protection via an option byte. If setting option byte via IAR or ST Visual Programmer option byte tab, then both of application code and code protect (ROP) are working correctly. This programming manual describes how to program the Flash memory of STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx microcontrollers. I don't have any problem reading/writing. Though I would also expect a settings page somewhere with the specific options for the specific processor. http://www. 2. And then write 1 to the nRST_STDBY bit of the register Flash memory option register (FLASH_OPTR) to stop resetting during Standby mode. Updating option bytes Option bytes updated successfully. Check the specification/datasheet of your slave device. Two write-protected (WRP) areas can be defined, with page (2 KByte) granularity. to set security (see MCU Security). The grand plan is to implement a bootloader. 0 STM32 ST-LINK Command Line Interface ST-LINK SN : 51FF6D064989525019422287 ST-LINK Firmware version : V2J27S0 Solved: I'm trying to write the option byte in my STM32G030 uC to be able to start the internal boot loader by pulling BOOT0 high (set nBOOT0_SEL. c library function: How do I read and write a byte to FLASH using a STM32 chip. Writing is usually done by writing the target register address first, followed by writing the value, without stop/start. How to write to STM32 Flash. STM32_Programmer. I think you should to write 0 to the IWDG_STDBY bit of the register Flash memory option register (FLASH_OPTR) to freeze the IWDG counter in Standby mode. 1. Registers greater than one byte are usually mapped to consecutive byte register addresses. See the appropriate page in the manual (eg: It is reversible only in a few of the latest stm32. Leave a reply. Now I am doing the option byte unlock procedure and the OPTLOCK-bit in FLASH_OPTCR is cleared to 0. That is the whole point and only reason that you would ever write 0xCC. Either the tool won't connect or if it does, the option byte is not reprogrammed. 1. unlock the option bytes by writing the correct keys to FLASH_OPTKEYR and clearing OPTLOCK; set the desired option values in FLASH_OPTCR; set OPTSTRT in FLASH_OPTCR; This works fine for all option bytes except RDP, which locks the MCU after setting OPTSTRT. How do I read and write a byte to FLASH using a STM32 chip. Openocd how to write option bytes to STM32F4. Then I can only connect to mcu using ST-LINK Utility. Writing takes a bit more code, as the FLASH and option bytes have to be unlocked first: FLASH_OBProgramInitTypeDef OBInit; // programming option structure Hi , thanks for your response! To be honest my post was posted 1,5 years ago, so I don't really remember our solution but we had another HW cycle anyway so think we simply changed the pinout. Share. Subscribe to RSS Feed you can use the semaphore protecting the flash access as any writing to an option byte shall be I'm currently tuning some code written for an STM32F070, where we use one byte on user option byte to keep some flags between Resets, using: FLASH_ProgramOptionByteData(ADRESSE_OPTION_BYTE_DATA0, * More info at -> RM0091 Reference manual STM32F0x1/STM32F0x2/STM32F0x8 advanced ARM®-based 32-bit MCUs * 4 Option byte * There are up to 8 option bytes. Subscribe to RSS Feed; Mark Topic as New; Mark Topic as Read; Float this Topic for Current User Is there code example for Can you still access the option byte ad dtry to set the watchdog option back to its original value. Option byte programming is directly supported by J-Link. Check for "eeprom emulation" or "bootloader" app notes. Main features: Install host dependencies. Be Hi, I have a custom board using STM32G431CBU6. How to write/read to FLASH on STM32F4, Cortex M4. Browse STM32 MCUs Wireless; STM32WB + option bytes setting; Options. However I'm not able to disable the write protection using the ST-Link v3 and STM32CubeProgrammer. I hope the RDP option byte was not set to 0xCC => This would fully protect the device with no way to exit from this situation. This issue occurs with both combinations: my board + J-Link or Nucleo + ST-Link. Is there a way to write to the option bytes of STM32 microcontrollers from pyOCD to be able to reset them to 0xAA, and be able to write to the chip again? Hello, Refer to one of the examples provided in CubeF/H. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Programmer/board type: Stlink/v2 Programmer firmware version: Don't know Operating system: Arch Linux Stlink tools version: just compiled from git Stlink commandline tool name: st-flash Target chip: STM32F030F4P6 . All "Write Protection" fields are checked. For example fir STM32F4 product, download CubeF4 and refer to the examples provided under \Projects\STM32469I_EVAL\Examples\UART, There are at least two examples one using interrupt and the other using DMA. 1) Clearing nBoot0 and nSWBOOT0 bytes. The procedure for writing option bytes is the same as for writing EEPROM, except for the unlcok sequence: OPT bit has to be set in FLASH_CR2 and FLASH_NCR2 registers. See how the updating and configuration of option bytes works via STM32 Cube Programmer, and the UART/COM connectivity method, see if you can apply that you can also create an array if you want to compile time allocate (dont do runtime allocation, this is an mcu so no reason for it at all you OWN all the ram just use it) some amount of ram to be used by the application, if for some reason that block has to be aligned (not sure why for these devices) then just use a fixed address like the volatile pointer thing and as the Option bytes. h and tried debugging the code. Get ID command (device side) Start Get ID command Received message information block (system memory or Hello @Rena Z. 2 "STM32F10xxx" subsection 13. Generic I'm working on a project where we are using the new STM32U575xx series. #iar-ewarm #option-bytes #stm32 Option bytes Write operations to the main memory block and the option bytes are managed by an embedded Flash program/erase Controller (FPEC). The terminology is confusing, in Table 9 "Description of the option bytes", the following text can be found: "USER: User option byte. something detects that you're trying to do a byte write rather than a half word (16-bit Sorry but i didn't get your answer why are you talking about GDB ? I just want to include option bytes as i want to configure them while programming. For now I did it on st-link, but it is not feasible to use this method in future. Is there some simple jlink script, which I can use to program the option bytes (i want to change the boot bits) Hi, I forgot to comment the protections set in app_sfu. How can I write to the area of these flash option bytes not reserved for the other functions described in Table Solved: Hi, For stm32wb flash operations we have to implement diagram described in AN5289, page 36. For example, the option bytes for the STM32F4 are not in the same memory location as the option bytes for the STM32F0. The S Reading the bytes is simple enough: mode = HAL_FLASHEx_OBGetUserData(OB_DATA_ADDRESS_DATA0); // from option byte 0. If I try to unlock the write protection I get the STM32 microcontrollers have bootloader in system memory which is write-protected. Usually, in order to write Options Bytes on ST targets you need to unlock the registers in the first place. cfg -c "reset halt; stm32f2x unlock 0; To program an Option byte, set the OPTPG bit in the FLASH control register and perform a half-word write to the Option byte. Then I write a new boot address for BOOT_ADD0 and lock the option byte by setting OPTLOCK-bit in FLASH_OPTCR. 0 Kudos It has some helper calculation to figure out the right addresses, and then write 4 bytes to the start of the OTP area, and then locks the first block (32 bytes in my case). c FLASH_Status FLASH_EraseSector(uint32_t FLASH_Sector, uint8_t VoltageRange)) and Moreover "stm32f1x options_read 0" command seems to work fine, but not "stm32f1x options_write 0 . When flashing a file, a checksum is calculated for the binary file Once you have modified the option byte values, click on the "Write" button under the "Option Bytes" tab to write the new values to the STM32U585. The PCROP sector is selected by using the same option bytes as the write protection, but with SPRMOD option bit active. How do you write to the option bytes? I did not want to have to do this in the firmware (using the core to write in the flash the values of the option bytes). bin 0x1FFF7800 st-flash: Checksum for binary files. Best regards, Niklas Your current option bytes suggest the voltage level of specifically BOOT0 pin is irrelevant (nBOOT_SEL), the device checks option bytes to decide where to boot from. dfu-util – Device Firmware Upgrade Utilities WRITE_REG; READ_reg; FLASH Register: Option Bytes /** @defgroup FLASH_OB_Type FLASH Option Bytes Type */ #define OPTIONBYTE_WRP 0x01U /*!< WRP option byte configuration */ #define OPTIONBYTE_RDP 0x02U /*!< RDP option byte At level 0, no read-out protection is enabled, and all read and write operations on the flash memory and backup SRAM are possible in all boot configurations. and it appear to be able to remove write protection and program the MCU, but in reality it does not and problem remains. // unlock Option bytes mww 0x40023C08 0x08192A3B; // OPT key1 mww 0x40023C08 0x4C5D6E7F; // OPT key2 mdw Write operations to the main memory block and the option bytes are managed by an embedded Flash Program/Erase Controller (FPEC). CubeProgrammer provides default external loaders STm32F4xx devices have OTP (One-Time-Programmable) bytes. Hello, Im developing an program that controls an ST-Link to flash an STM32F1. for STM32 microcontrollers and original equipment manufacturers may use them when developing their own application code. If you mess things up, you can reset the option bytes STM32 Flash Option Bytes Programming. 6 The host receives the STM32 product ID (two bytes) sent by the device as shown in Figure 7. When reading out FLASH_OPTCR1 I get the new boot address for BOOT_ADD0 (and the old for BOOT_ADD1). • Option bytes can be modified and protection level regression to Level 0 is possible, but this causes the Flash memory and backup registers to be mass-erased Protection levels 0 and 1 The read protection is activated by setting the RDP option byte and then, by applying a system reset to reload the new RDP option byte. These use the method of setting the MSP and PC then doing the jump with a Note that option bytes can still be modified in this level, 4. st. Stop mode Reset event when entering the Standby mode" I can't program the STM32 Flash with 8 bits of data. Is it possible to simply add the option bytes to our binary? I guess at least some script would be necessary for unlocking the the write access for the option bytes. The high voltage needed for Program/Erase operations is internally generated. The option bytes are located in a special part of the Flash memory (see table 9 in the RM to get the exact addresses). When it is set, each bit in the For the write protection option byte, I tried multiple times with the same method and checked the write protection option byte using a debugger, but it is not updated(it remains as default). Any Bootx pins and option bytes settings cant chage it. So the software cannot possible detect any change in the memory/bytes/flags, independent of what software is being used on the device. To make any changes, the user must address the respective registers and follow a certain procedure (for more detail, see chapter 3. Option bytes on the microcontroller can also be changed. nBOOT0 = 1 (checked) means BOOT0 = 0. b) The J-Link SDK which can be used to write your own application using the J-Link API. I programmed corresponding option byte bits and when i tried to set option byte loading bit in flash_cr mcu is halted. By the "power state of the microcontroller" i mean the information that the microcontroller has been shut down or started up properly. Posted by Just1M on 2019-04-24 11:34. I write a simple program which runs STM32_Programmer_CLI multiple times with these arguments and than checking return code & CLI output If every step completed successfully. Each Option byte is stored as a word. Now I created a bootloader and wanted to write protect the bootloader section. and requred byte is not written but I can changed this optin byte from TM32 ST-LINK Write Memory (2) 0x31 Section 3. For more details refer to AN2606. The inactive bank is always mapped at that address, regardless of FB_MODE. which is the two lock bit the second one is not relevant as it locks OPTION BYTES not related to OPs problem – 0_____ Commented Jul 28, 2020 at 9:23 STM32 - writing and reading flash. Then try. His “work” is to store information about states of data block, because you can There are two ways of emulating EEPROM on the STM32F4: On-chip 4 Kbytes backup SRAM On-chip Flash, with specific software algorithm The second option is described here: AN3969. Root Security Service (RSS) and the Firmware Upgrade Service (FUS) are responsible for secure wireless stack updates and encryption key management. Is it possible to divide the mwmory in to dual banks( 256KB each). Flash writing in STM32 MCUs Embedded software 2024-12-12; STM32F4 fails to verify after programming with STM32_Programmer_CLI over USB in STM32CubeProgrammer (MCUs I programmed corresponding option byte bits and when i tried to set option byte loading bit in flash_cr mcu is halted. When I checked option bytes under target -> option bytes, read protection level is changed to 1 from 0 and sectors are write protected. You could link the option bytes data to the option bytes memory location STM32U5 Option bytes programming and RDP locking/unlocking features are implemented in the PCode_DevPro_ST_STM32U5. FAQs Sign In. "so it may be a bug from OpenOCD which can't write option bytes on this particular device, idk why because it's at the same address Should I programmatically write the option bytes in my bootloader code ? I tried, but it seems as soon as the option byte is written, the chip resets and then an infinite loop occurs. Each option byte, except for read-out protection, has to be stored in a normal form (OPTx) and complementary form (NOPTx). There I always got a NACK back, thats because of the wrong amount of bytes I send to this memory address. But google, – Erase the entire option byte area by using the OPTER bit in the Flash memory control register (FLASH_CR) – Reset the device (system reset) to reload the option bytes (and the new WRP[3:0] bytes), and to disable the write protection'' STM32 MCUs; STM32 MCUs Products; Option Bytes: Is it possible to program user data Options. Subscribe to RSS Feed If I use the option byte user data byte 1, do I need to issue a system reset after it? Since I have to erase all option bytes to be able to write, can I just reprogram the old values with just one byte changed without Using a software jump to the bootloader is the better option here in my opinion, leaving option bytes alone. J-Link supports direct, memory-mapped option byte programming for most STM32 devices. Email. 3. I added the dlpm option to the connect command. 3) Program the device. is there any special has to be taken while writing the data to the option byte. At level 0, no read-out protection is enabled, and all read and write operations on the flash memory and backup SRAM are possible in all boot configurations. Here is my bank swap function. Note that locking prevents further writes (changing bits from 1 to 0), erasing (changing bits from 0 to 1) is never possible, not even when still unlocked. I try to do the following command: ST-LINK_CLI. If you feel a post has answered your question, please click "Accept as Solution". – 512 OTP (one-time programmable) bytes for user data The OTP area contains 16 additional bytes used to lock the corresponding OTP data block. I have been doing some tests and have come to the conclusion that I need to modify the option bytes. Each sector can be 06 9 3&523 HG,3 &RGH DUHD 8VHU FRGH 8VHU FRGHBVWDUW# 8VHU FRGHBHQG# 3&523BVWDUW# Upon an option byte programming failure (for any reason, such as loss of power or a reset during the option byte change sequence), mismatched values of the option bytes are loaded after reset. ” RDP is now 0xFF and cannot be set to level 0 (no protection) again. Just out of curiosity, did you already test this with a board that has a pull up on the boot pin? And what a Also, when I write the SAME bytes to the memory the device also resets. and protected against spurious write/erase operations. Best All read and write operations on the flash memory and backup SRAM are possible in all boot configurations. Programming the option bytes of the STM32G4 series is implemented in the J-Link DLL natively. Screening at your datasheet, I guess the flash memory addresses are between 0x08080000 and 0x00080000. /st-flash --debug write option_bytes_dump. It told me the write protect was still at its default. Reading the manual in-depth is of course an option, but there is usually also an app note for how this is done. openocd -f openocd. JLink’s small utility that is supposed to restore STM32 option bytes didn’t appear to work for write Although the hardware has a 4kB area used to store option bytes, only those option bytes listed in the RM are able to be accessed, which is a small subset of the 4kB technically available in the hardware. To learn more, see our tips on writing great answers. Use STM32CubeProgrammer for option bytes inspection. /st-flash --debug read option_bytes_dump. – Option bytes: read and write protections, BOR level, watchdog software/hardware and reset when the device is in Standby or Stop mode. usually in the microcontroller world when you use hex, you mean actual bytes, the hex is just a convenient notation to write binary byte values in, it usually never means send the ascii hex values. 3) ? I agree I'm missing the basics about the options bytes programming, any help would be greatly appreciated ! Thanks. pex For compatibility with STs STM32_Programmer_CLI the password value has the same format, except "0x" prefix and whitespaces. ld) is modified by adding a new memory block and a new segment. Best regards. How about option bytes access? Do we have apply. If no byte 0xFF can be found then the sector is full - erase the sector (using some thing like stm32f?xx_flash. There's also a write protection on the chip, see the doc. Even if the firmware on the device checks some memory/bytes regularly, there is no change of the bytes in the memory. (++) void FLASH_OB_BORConfig(uint8_t OB_BOR) => to set the BOR Level (#) Once all needed Option Bytes to be programmed are correctly written, call the FLASH_OB_Launch() function to launch the Option Bytes . STM32 MPUs Products; STM32 MPUs Boards and hardware tools I think follwoing the reference manual e. This code could be anything you want. Keep in mind that option bytes are stored in flash, but you interface with them via registers. Problem with Writing to the Flash Memory of the STM32L4R5 microcontroller. The boards are flashed using a J-Link and we would not like to switch to ST-Link. The upper 32 bits are the complemented (inverted) option bytes and the lower How can I select specific memory byte in option byte to write the data and. you will ned to write the script unloncking option bytes and programming them. So they need to be include in the binary file. Option Bytes are mostly used to pre-configure the system on chip before starting the Cortex®-M and user code. It enables users to easily create, develop, and debug Zephyr applications. The options must be reloaded after every change of the Option bytes in the NVM, so that the changes can apply. They are configured by the end user depending on the * application requirements. Attaching the screenshot of the complete output of option bytes read command. Open source STM32 MCU programming toolset. Yes, you can set the write protection programmatically; read the manual section about option bytes. Options. Try unchecking nBOOT0 option Reading the bytes is simple enough: mode = HAL_FLASHEx_OBGetUserData(OB_DATA_ADDRESS_DATA0); // from option byte 0. It could be: a custom bootloader or ; it could be application code. Option Byte Modification in RM0433). STM32_Programmer_CLI -c port=swd -w32 0x5800040c 0x00008000; The SFSA value should revert to 0xF4 with all Returns the FLASH Write Protection Option Bytes value. 4. For the Option byte area, the start address must be the base address of the Option byte area (see note) to avoid writing inopportunely in this area. Usage DevPro -operation [operation_name] -if SWD -speed 4000 [parameter_name=value] -ScriptFile PCode_DevPro_ST_STM32U5. Now, you can reissue the option byte command ‘STM32_Programmer_CLI. You can also modify the values of option bytes here. for the STM32L412 RM0394 "3. Now, you can reissue the option byte command Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company After option bytes write operation, the target device must be power-cycled. . 0. I need to write data option byte to stm32f042 by ST_LINK_CLI. Setting this bit, the ongoing write/erase is completed, but no new write/erase or read operation is executed. (This is explained in UM8001: Chapter 13 "Device specifics", section 13. Selects all user option bytes This parameter is a combination of the following values: OB_IWDG_SW / OB_IWDG_HW: Software / Hardware WDG selected ; OB_STOP_NoRST / OB_STOP_RST: No reset / Reset generated when entering in STOP ; In order to program the option bytes of a STM32F103xx device with J-Flash, you need to reallocate the option bytes from 0x1FFFF800-ox1FFFF80F to 0x6000000 - 0x600000F. * I change the option byte; read it back and it still has the same value. To erase the user portion, interpret the option byte and erase the relevant “The value of an option is automatically modified by first erasing the information block and then programming all the option bytes with the values contained in the FLASH_OPTCR register. Import toolchain and SDK. It took an hour to figure out how to restore the chip option bytes that determine if the flash memory is protected or not. The STM32 has a read-out protection level 2 feature so code can't be read out via the debug interface (SWD). 6. Note however, that there are nBOOT0 and nBOOT1 option bytes, not BOOT0 and BOOT1. Please note that usually, all option bytes have to be written in one go. Block Name Base addresses Size (bytes) Main memory Page 0 0x0800 0000 - 0x0800 07FF 2 Kbytes Page 1 0x0800 0800 - 0x0800 0FFF 2 Kbytes I just wasn't sure if it is reliable to use them for the purpose of storing information permanently. I am also looking for a possibility to use the 2k user option bytes of the stm32h7 devices. I have seen that there are quite a few questions about jumping from an app to the ST system bootloader, for example this one. So, during each startup and shutdown this information should be written to the option bytes. STM32F107 Read Out Protection by Code HAL. I am programming the stm32 with HAL . Reload option bytes with the LAUNCH bit, which also resets Option bytes flash. So under the Option Bytes page, Read out protection is No Protection; Dual bank boot is disabled Software Watchdog is used, no reset on stop or standby; Under Write Protection they're all checked (Write protection not active)? I have checked but stil the same, I can however program the option bits with no problem via USB, i think Line 4 downloads the option bytes; line 5 should give me option bytes only in a 4-byte hex value (see question below) line 6 reads option bytes and flash protection bytes; lines 7 & 8 delete the splitted files - this is to ensure that those files aren't used seperately by accident. When a WRP or PCROP is set, mass erase is forbidden. I have the option to write Byte, Half-Word, Word and Double-Word to each memory address at a time using the stm32f4xx_hal_flash. As specified in datasheet it's necessary to send 64 bits instead of 32 bits. As far as I can tell, this is intended behaviour, and requires a reset of the FLASH_TYPEPROGRAM_FAST mode is used for writing 32 double words at once and when this mode is used, the third argument (data) becomes the raw starting address of that 32 double word data source, not the data itself. In my previous post, I wrote about how to read from flash memory. I know that the ST-LINK Utility from ST is capable of editing the Option Bytes. I am using `dfu-util` to upload firmware and option bytes. mbed compiler: how to programatically read & write flash STM32F091RC on Nucleo eval board. stm32 and external flash (w25q) connection problem. Not that I see a "boot address" field in the L4 option bytes, but I didn't look very hard. In the OB (Option Byte) page, you can view the current settings of the option bytes for the connected MCU. 2 "Option byte programming") I am trying to implement a bank swap mechanism for STM32L471RET6. via J-Flash). I made RDP level 0 from cube programmer, but still write protection is enabled which is not allowing me to The only way to do this in STM32CubeIDE is to add a separate section in the linker for your option bytes. Other options: a) Write and download a small RAMCode + the OTP data to be programmed into RAM using J-Link Commander. For What I tried to do is using the options_write command. STM32 MCUs Products; STM32 MCUs Boards and hardware tools; STM32 MCUs Software development tools Options. When the BFB2 option is set, the device boots either in Bank 2 or Bank 1 depending on the valid bank. Those mismatched values force a secure configuration that might permanently lock the device depending on the STM32 series. The program needs to be able to remove RDP on the MCU its trying to flash. Later I realized and commented everything and it is not allowing me to flash the program on the device. Name. Im doing the following steps: 1) Unlocking Flash - confirmed working (registers confirm) 2) Unlocking option bytes - confirmed working (registers c When selecting the device with option bytes enabled in J-Link, this simply means that you can write data directly to the option bytes (e. The easiest way to change them is probably in STM32CubeProgrammer or in your startup code. The purpose of this article is to show proper usage of the HAL option bytes API for multiple use cases. Problem: I would like to access option bytes with embeded bootloader, but I can't find flash address for them. At least for F1, F2, F4, F7 and L4 (+) option byte programming functionality is already included in OpenOCD. 0). Like STM32U5. 2 Option bytes programming" is quite good at explaining. . Please find below a small generic sample sequence which can be adapted into J-Link Commander syntax (e. – When option bytes are to be written, the new contents have to be written to the option *registers*, and when initiating the write prodedure, the option byte area is erased (probably the whole area) and the register contents automatically copied to this area. sh -c port=swd --optionbytes RDP=0xBB (to enable read out protection) Unfortunately, it does not work the this H7 core. There is also 17th block with 16 bytes of data. Sign up using Google Openocd how to write option bytes to STM32F4. Contribute to stlink-org/stlink development by creating an account on GitHub. Having said that, there are no rules, and sometimes people do actual ascii hex. So, now I become an J-Link Commander script file expert. You're not writing to them directly. Bytes are structured in 16 data blocks where each block has 32 data bytes of available memory. This can be booted with right sequence, that I don't cover here. Will STM fix this FLASHER-STM32 for the H7 processor? Could this program recover the option bytes? Is the same bootloader protocol for STM32H7 than the others? Now I am doing the option byte unlock procedure and the OPTLOCK-bit in FLASH_OPTCR is cleared to 0. I have the following function to set the option bytes: The user area in Flash memory can be protected against unwanted write operations. If yes can Although there is no menu driven approach for adding option byte programming, it shouldn't be very difficult to insert the commands for option byte programming there. 1 Write Protection. There's an option byte that specifies the boundary. Subscribe to RSS Feed; Mark Topic as New; Mark Topic as Read; Float this Topic for Current User; Are you suggesting that if I try to write 4 bytes one byte at a time to unaligned addresses I will have no problem, but if I try to write 4 bytes (32 bits) at once to unalligned addresses it will not work? Other STM32 have MORE UART bootloader no magic byte after mass erase in STM32 MCUs Embedded software 2024-12-30; USB DFU doesn't properly erase application flash, only allowing me to program once in STM32 MCUs Products 2024-12-25; STM32N6570-DK: Cannot erase external Flash in STM32CubeProgrammer (MCUs) 2024-12-23; I can't burn my STM32F103 CPU in Programming FLASH (program) memory or programming option bytes - you still have a vulnerability to having the program operation corrupted. Something like this: /* Memories definition */ MEMORY { This feature is ment for firmware upgrade in the field, but not for debugging. Unprotect Flash to write a new Bootloader in STM32 MCUs Security 2024-12-02 Dynamic use of WRP (in STM32WBx5) ? in STM32 MCUs Security 2024-11-18 Secure Firmware Install over USB on STM32H743 in STM32CubeProgrammer (MCUs) 2024-11-11 This is because the RDP (read-out protection) option byte is set to 0xBB. Post as a guest. But I am not sure if these so called user options bytes could be freely used or not. 10. 16. It is usually the STR assembly instruction. 2) Fill the option bytes range with the desired valuse. com/stm32 I could also work with JlinkExe. w4 to write to a register). exe" -c SWD -rOB STM32 ST-LINK CLI v3. From chapter 7. With options for full/partial erase, and settings for the sections of memory to program. RSS / FUS. If I try to edit any of the option bytes, it fails with something like the following error: Error: Option Byte Programming failed. STM32U0 Option bytes programming and RDP locking/unlocking features are implemented in the PCode_DevPro_ST_STM32U0. I want to use this option byte space in flash to store a few data bytes my application needs in non-volatile memory. Note: The read protection can be disabled using the boot loader (in this case only a System Reset is necessary to reload the option bytes). Under the Option Bytes tab, RDP is unchecked. If someone has an idea, please share Problem with reloading option bytes - STM32L010K4T6 I've implemented Read Out Protection in the firmware running on an STM32L010K4T6 MCU, but I'm. The BFB2 option in the user option bytes is used to select the dual‐bank boot mode. Browse STMicroelectronics Community. Scan through the sector looking for first byte that is 0xFF - the byte before this was the last byte written and this is the next byte to write. STM32 Read-out protection via OpenOCD. Sign up or log in. So what you would have to do is: 1) Add the optionbytes range to the file you are downloading with J-Flash. after I checked the option bytes using STM32CubeProgrammer, I realized that the option bytes didn't changed. E. “Hello , I think it could be done as follows by inserting the option bytes into the hexadecimal file based on the source file and the linker file. -@- When changing the IWDG mode from HW to SW or from SW to HW, a system STM32 Prog : Error: Expected value for Option Byte "RDP": 0xAA, found: 0xFF Error: Option Byte Programming failed To learn more, see our tips on writing great answers. KnarfB i'm currently trying to find a suitable way to programm options bytes in production. Sign up using Google Sign up using Email and Password Submit. Rest of the option byte configurations are kept as it is. They are automatically loaded after a Power-On reset or on request by setting the OBL_LAUNCH bit in the FLASH_CR register. The reference for the chip mentions that in order to write Option Bytes that there is a pattern and some registers that have to be addressed. The high voltage needed for program/erase operations is generated internally. to test option bytes ability, run: STM32_Programmer_CLI -c port=usb1 -ob displ than use option byte name for setting protection level as you need. exe when. 1 RM0456 it is said that option bytes can be accessed only through flash registers:-option bytes for user configuration. Could you download the all option bytes, both the secure one and those related to the memory protection. This byte is used to configure the following features: Select the watchdog event: Hardware or software. For example: Write the new firmware version at 0x08040000. For our purposes, we will look at the STM32F0 as an example. This doesn't always work. Do not blindly toggle BFB2, because it does not necessarily reflect which bank is active. I have valid code loaded in bank #1 and bank #2, but I can't change the option byte to switch between them. The distinction is a logical one based on what you write your code to do. Use st-link utility instead. In reference manual STM32G491 MCU's have single bank memory(512 KB). STM32 MCUs. Set the PC / SP to the beginning of the RAMCode, set a breakpoint at the end address and let the RAMCode run. the following C code would write the value 42 to the first flash memory address: The option bytes of the STM32F051 can be set by performing several read/write accesses to different flash registers. You must write a correct value in the lower half-word and the FPEC will automatically calculate the complemented value. This can be done by writing 1-2 magic values listed in the ST manual to a specific registers prior to writing the option bytes. STM32 MPUs Products; STM32 MPUs Boards and hardware tools; STM32 MPUs Embedded software and solutions; STM32 MPUs Software development SPI NSSP on STM32F767ZI in STM32 MCUs Products 2024-12-10; PWM shutdown using internal comparator in STM32 MCUs Embedded software 2024-10-29; wake from RTC only works 32 times and system Battery Drain in STM32 MCUs Products 2024-10-07; STM32L452 Bootloader (UART) not working via STM32 Programmer CLI in STM32 MCUs Embedded The option "Boot from user Flash" will run whatever is in the user flash. This means => to configure the user Option Bytes. You want BOOT0 equal to 1. To activate the PCROP, the SPRMOD option bit must be activated, this changes the function of the nWRP option bits. After writing the new option byte values, perform a full chip erase by clicking on the "Erase Full Chip" button in the main STM32CubeProgrammer window. 8. Posted on October 25, 2017 at 07:04 How to write option bytes in assembly language for stm8 mcu in stvd developer using cosmic compiler. exe -OB Data0=0xAA Data0=0x55 Available only on STM32 F1 and STM32 F3 series. After I programmed the units, I disconnected power and then reconnected and checked the option bytes with the program. Some chips have a option bit in flash for turing that BOOT0 pin behaviour off. Using JLink EXE. Set the BFB2 bit in the option bytes if FB_MODE is 0, or clear it otherwise. The Option byte is stored in the lower byte of the half-word and its complemented value is stored in the upper half-half-word. As i don't use IDE, etc i tried to add this section in the ld file and to write directly the value that i want at the good address. However, HAL_FLASH_OB_Launch() hangs, and even if the CPU is reset afterwards, the option byte is not rewritten. Figure 7. I was finally able to write a script file to erase and program the option bytes in the . WRP or PCROP are enable when START_ADDRESS <= STOP_ADDRESS 0). I have a STM32F103C8T6 and I'm trying to write in flash, I saw in HAL_FLASH libraries and I took some of the code to write in a single byte of the presumably with no option to write more or fewer. /st-flash --reset write Zephyr Workbench, a VSCode extension to manage Zephyr on STM32. The right way is to use the write memory command and to use the address 0x1FFF 7800.