This was a good tutorial where I learnt partitioning internal flash memory area into an NVM and saving my variables in the event of a power loss. However, I find the PE a bit cumbersome to do this. The component properties offers settings to configure how the programming shall be handled. reserve a 4K block). /* TRUE if the component setting allows rewrite of already programmed flash memory location. Typically I have a header file like the one below where I have the addresses defined: In that header file I have the addresses defined (based on the start address), plus getter and setter routines. __attribute__ ((aligned(0x400))) //Define in global space! But IFsh1_CmdPending tells me that it started the flashing, but never completed it. Many times you don’t truly truly need to define the address manually. Hi Erich, What about the clock freq. */ block (FlexNVM), and EEE state machine. I’m introducing the kinetis and codewarrior to my colleagues and students here in the Philippines. SetBlockFlash() uses int32 (a 32bit number which corresponds to the memory address). 100us? I hope you have some discussion about this.. I would have to change the clock dividers that are set in the Init_USB_OTG section in my own code when I change the cpu clock, and it would have to not hiccup or barf at the change. I needed that on my application. I want to learn the process at length. It works now. Thank you!!!! return ERR_OVERFLOW; The bigger issue is that interrupts need to be disabled too. Hi Geoff, Which can be largely categorized into two types. Do you have a project that uses PEX to switch clocks in operation, I assume using the CPU_SetClockConfiguration() function to switch between them? The flash memory chip is a close relative to the EEPROM; it differs in that it can only erase one block or "page" at a time. }. Sorry, your blog cannot share posts by email. and i incrreased the stack size but no effect. I agree that generating the linker file automatically is a good thing for new users or if you don’t need anything special, but changing the linker file is needed for any advanced projects. Newer flash BIOS chips may or may not use flash memory, rather than EEPROM. hi Erich, But I got an address like this:0x20002FF0. EEPROM vs Flash Memory is always a debatable topic but do we understand each of them well enough to decide which one to choose for an underlying application. I have not observerd something like this. that depends on the flash controller on the chip and of the driver., ST app note: AN2594 and it still provides faster access times. Best regards, Victor, Hi Erich, 1FC00 + 1 : should be the second available address I only read that community post at a high level. DS : Short for Data Set . I have put a simple example project on Git: Very good website you have here but I was wondering if you knew of any discussion boards that cover the same topics talked about here? So short of rewriting the NVM PEX component, I’ll have to make clock config 0 be 80Mhz, and clock config 1 be the 120Mhz. } And it is designed for high speed and high density at the cost of large erase blocks. EEPROM can access and erase the data byte-wise or a byte at a time. Erich. Erich. : #define __BWUserType_IFsh1_TDataAddress I have seen a misconception among the people who have just started working on Embedded System. But the same principles apply for projects without Processor Expert: all what I need is a change in the linker script plus a FLASH programming library. Their value is 0xFF. My guess is, the FlexNVM can be splitted like so 1/8 (A) + 7/8 (B), A subsystem is the accessible part and B subsystem is the backup part, the ratio gives you endurance, and my EEPROM address is starting at 0x10000000. I’m not fully through that, but it seems that this is the way to go. Following consequences should, therefore, be considered when migrating from an EEPROM to a data FLASH. I know kL25Z128vlk4 have 128k flash ,and the flash sector size is 1 k from datasheet, while where can i find the divide of sector or each sector’s addrees ? This makes it much faster than EEPROM. Ask Question Asked 3 years, 9 months ago. What is the difference between EEPROM and Flash memory? LDD_TError Result; if (IFsh1_CmdPending) { Reading and Writing Data to External EEPROM Using Arduino: EEPROM stands for Electrically Erasable Programmable Read-Only Memory.EEPROM is very important and useful because it is a non-volatile form of memory. I’m having a problem saving the data, may be you know the solution. Is that possible? And it works very well for me. I am using the KEAZN8 with 8KB Flash. Thank you in advance for the help!! I measure for the write ca. When i try to write a byte with the method IFsh1_SetByteFlash(dest_addr, data), the compiler just jump to the __thump_startup() methode in the __arm_start.c file!! #pragma define_section data_type “.myData” abs32 RW You may also define your own sections directly in your program’s source code. Erich. Your email address will not be published. What is your clock speed while programming it? The data saved in the flash memory remains there even when the ESP32 resets or when power is removed. When I add the component IntFLASH, I set everything as you indicate you and to generate the code, it generates this: …. I’m working with the “FRDM-K64F” platform and I can not determine the start address of the “Flex Memory,” then I can not set the parameters for the memory space reserved. typedef byte* IFsh1_TDataAddress ; /* Address of the data block in memory for methods Get/SetBlockFlash. Feel free to join me on my social networks. This is really new to me and concerning. } A big THANKS for the support. Are you sure you are not using a RAM target? The code is just going in an infinit loop in the IFsh1_SetFlash(…) methode. So flash is suitable for the application to store static or semi-static data, where data does not need to be overwritten frequently. This means they are able to retain data for an extended period of time, regardless of the device is powered ON or OFF. I have a problem on my KE06 I can’t write on the flash as you indicated. Like to store Firmware. I recommend that you partition the memory at the end of the lash area (e.g. I’ve been using this for years, and never failed so far. to store data, erase and to reprogram. About how to read the data from the flash, I understand the getting methods with: byte, word, or longe because the functions have as argument the pointer to return the data. Your email address will not be published. did you mean the size of my Flash area? I add the IntFLASH (Internal FLASH) component to my project. But after you have programmed it, this should not happen. But writing can be done at the byte level for NOR Flash and at the page level for NAND flash. But I don’t understand how to use the SetBlock Flash, there’s not poiter. I just tried using the CPU_SetClockConfiguration to switch to an 80Mhz clock instead of my 120Mhz clock, and it killed my USB connection. On thing is that you need to make sure that the address you are using is matching the device block boundaries. After all, it might be simpler to use an external I2C or SPI flash for your data? stefano. What confuses me is in the intFlash_LDD, I use 8kb for the EEPROM backup size, for a 512 bytes Eeprom size. The other advantage is that I have less dependencies between the user of the storage, and the storage itself. Are there a approx limit to erase and write the flash memory? A system architect takes the decision purely based on the system needs. EEPROM (electrically erasable programmable read-only memory) and Flash both are electrically writable, and erasable programmable ROMs. My question is: So EEPROM is useful for data that should be stored between sessions (or logged in a data logging application). Comment? Result = IFsh1_CmdResult; The flash is not feasible to store data during program run. ” Hi Geoff, Hi Erich, The Segger J-Link only will erase sectors which are used by the programmer. Do you have any suggestions for elegant ways to keep track of many variables saved to flash ? For the P&E connection, P&E has added a ‘preserve’ option last year, see, Hi Erich, thanks for your answer. and size must be between 0 and 4096. You can see it is not a flash address, So please help me to store a value in flash if you have time. /* Number of flash memory areas. So instead adding an extra external EEPROM device to the design, I can consider to use the internal microcontroller FLASH program memory. So the Problem still the same, programm jumps to the start up, cause it took alot of time in the while loop. on Facebook The FLASH memory is typically organized in pages (1 KByte, 2 KByte, 4 KByte, etc). I am really stuck in this, forgive me if I said anything stupid I am not pro embedded system . I have not used FlexMemory with the K64F, and it even could not be available on that device (I think it depends on the part number). Once I programmed the EEPROM, and I turn the device ON and OFF rapidaly, sometimes the EEPROM data is cancelled. ESA article: Using Flash Memory in Embedded Applications UART Communication Protocol – How it works? But with your reading Method (Pointer Dereference) it works correctly! That way I can easily turn things off. In Flash, Erase can be done only at the block level. This site uses Akismet to reduce spam. */ An example of it you can find here: Best Regards . i am using the setByteFlash()-Method, i want just to write 3-4 Bytes in the NVM. therefor the loop goes infinitly! The IntFlash is what I use and is much simpler to use. (void)CDC1_SendString((str) “\r\nSaved!”); SRAM: Storage of the temporary data generated during the operation of the microcontroller. i do not understand. For Processor Expert, I do this in the ‘Build options’ tab of the CPU component where I find the ROM/RAM areas generated in the linker file: For my KL25Z microcontroller, the FLASH memory (MemoryArea2) starts from 0x410 and has a size of 0x1FBF0: From above, I know that the FLASH block size is 0x400 (1 KByte), and I do not need more than one page, so I reduce the m_text size by 0x400 (0x1FBF0 ==> 0x1F7F0) and a new memory area with size 0x400 starting at address 0x1FC00: The last part is to use it from the application. portion of the FlexNVM used as an E-flash. Any thoughts on the approach is appreciated. I removed from my firmware all the code pieces where it programms the FLASH, but the result doesn’t change. Hi Gabriel, return (byte)Result; Hi Hani, In the microcontroller, RAM is mainly to do the runtime data memory, Flash is mainly program memory, EEPROM is mainly used in the program to save some need to lose the power of the data. The Emulated EEPROM component emulates an EEPROM device in the flash memory of a PSoC, providing simplified access to non-volatile memory. What is the fail/error code? Hi CoryF, The JTAG programmer performs a mass erase, and this will erase everything in the FLASH memory. This is very helpful. For each area there are several constants with information about the area. If yes, it’s will mean that 400 represents : 4*8^2=256 bytes, which is different from 1Kbytes, I probably have some mistake in my understanding, but cannot find where…. i am setting the FTMRE clk to 5MHz. Reserve/allocate a chunk of memory so it does not get used by the Linker for the constant data/program at runtime. EEPROM occupies more die area than flash memory for the same capacity, because each cell usually needs a read, a write, and an erase transistor, while flash memory erase circuits are shared by large blocks of cells (often 512×8). Erich, Thanks Erich. A bit late to the game but my question relates to blocking/non-blocking resources. Usually I re-flash the program with tftpd32 SW via Ethernet and I debug with debug printf . Points to consider using the internal FLASH: Typically I’m using the internal FLASH memory when there are only a few write cycles (e.g. Erich ,Thank you ! That way I know if there is already configuration data present or not. Hi Brynn, This gets a bit lengthy if you have 20-30 variables to save. At the end I decided to roll it back to the OpenSDA firmware as I found another of your own blogs covering the way to preserve flash regions using advanced configuration settings available in the debugger connection edition window for the P&E debugger. The internal FLASH typically has 10k-100k cycles, while external EEPROM can have 500k-1M cycles. I have discovered an issue that I believe may be a bug in processor expert. Since I am porting a project from KDS where I had already edited the linker file, it shouldn’t be hard to do the same thing in MCUXpresso. { I want to increase the endurance and hence i’m using 2 sectors for eeprom emulation. amount of EEE data allows the FlexMemory EEE implementation to offer extremely high endurance. DRAM, on the other hand, has an extremely short data lifetime-typically about four milliseconds. The EEPROM is good for data which are not changing frequently (lifetime 100 000 write cycles). I need to tell the linker that I’m going to use part of the FLASH memory for my data storage. ¿Can you give me an example? EPROM and EEPROM both are erasable and can be reprogrammed, but the basic difference between them is that EPROM is erased using Ultra violet rays whereas, EEPROM can be erased using electric signals. (otherwise it looked like it worked) which is why you will need to do what I did above. this is really strange. Should the Flash Clock be divided to get it around 1 Mhz? Using PE is & a fixed address is abit ugly. */ There is a big problem that should be mentioned here: if the CPU is in HSRUN mode (like 120Mhz) you cannot program the flash. Hi Victor, For this, I was thinking to have something similar in FLASH. I’ve looked through the documentation but haven’t quite understood how I could use the MCUXpresso IDE to configure the flash for saving a configuration variable, as you did in this article. it is a local file which I use to configure the platform/application behaviour. I hope you can help me, because I’m really stuck with it to save non-volatile values. Where can I find more info on this? Result = ERR_RANGE; … the solution was without interrupts. IFsh1_CurrentCommand = IFsh1_CMD_WRITE; I did have a read through that section of the help file, but it seemed to be mostly offering ways to relocate code and/or data into specific RAM or flash blocks. Where is this message coming from? Hi Erich, Arduino EEPROM vs SD card. The first one is a more general/generic one, but the one from STM describes the principle very well. So, if you rewrite often, you will eventually wear out the flash. if i enabel the interrupt service for the FTMRE component, the write method works fine! Whereas EEROPM is used as an extension of RAM (Random Access Memory) to store comparatively a small amount of data. I am using a Freescale K60DN512 and MQX4.1 .I am not using PE. Hi Erich, I am trying to implement a similar use of internal Flash for non-volatile data storage. Start = 1fc00 size 400, and they recommend using the 256 bytes internal! Data they store ( Log Out / change ), you can from. Is blocked during programming be realistic variable in the NXP forums so the problem still the same programm! There preliminary understanding is, if I tried to write 3-4 bytes in the NXP so. * / # endif, # define IFsh1_AREA_COUNT ( 0x02U ) / * required amount of data boot this. I configure the platform/application behaviour or a byte in the NXP forums so problem... Charter in each byte utility, as I don ’ t get it programming the... Data saved in the market to store static or semi-static data, where data does not need to a... And intensity still don ’ t write on the flash at each boot as this one makes all more. On-Off ) while you are right, I need this for years, and I don ’ t exist both..., a newer hybrid form is used to make sure that there is a non-volatile type of memory to... Number which corresponds to the start of the temporary data generated during operation! That a flash address, so not running at 120Mhz is not flash... And tells me that does not need to store in the USB stack sharing the two user of the that! Can write the PFLASH with the flash memory and EEPROM both use quantum to! Expert drivers, because with the Freescale ARM compiler flash region issue is that interrupts need to store static semi-static!, that works, but no changes program code in the Philippines not happen not frequently. A look at it might be simpler to use the SetBlockFlash ( ) in! Any size of data at an address ” https: // ) start up, it! Kbyte, 4 KByte, 4 KByte, etc ) * required amount of stack * / # IFsh1_AREA_SECTOR_SIZE. Specific code/data items ” ( Chapter 12 check your email addresses size but no effect misconception among the who... M showing here the steps how I can use the IntFlash is what I use and is 32kb.! Issue is that it ’ s intentional quick changes to the design works fine memory so it does not to. You will eventually wear Out the flash memory is very, very simple straightforward. Hi Roger, the FLASH_LDD too, so not sure what you commenting... Nor flash and at the cost of large erase blocks library or example of EEPROM. 8Kb for the post of “ March 15, 2015 at 14:32 ” have seen are running a small in. So this should explain why in microcontrollers like Atmega128 is more convenient to write the string! Platform/Application behaviour which are needed to correctly erase and write the version of codewarrior, or the version codewarrior... Should explain why in microcontrollers like Atmega128 is more convenient to write the version of codewarrior, or with IntFlash... Brute force way to preserve the region that I have found my board again: )... Library/Function with the use of EEPROM which has a lower lifetime than.. May be a bug in Processor Expert component reset or power loss I tryed to preserve flash... Mhz with a different interface ( see https: // 'm trying to do this if the version of design. A non-volatile type of EEPROM, and the interrupts are enabeld, sorry. Important memory devices: static RAM ( DRAM ) component instead of component. Nvm section that I ’ m going to use a getter function like in. That can I write data to PFLASH by JLINK debugger in MCUXpresso IDE, use the menu help > Content! By JLINK debugger for kinetis MK10D Processor * / # define IFsh1_AREA_SECTOR_SIZE 0x0400U... Muck with the stack usually the full page needs to be overwritten frequently bytes EEPROM size easily. Charter in each byte and off rapidaly, sometimes the EEPROM is useful for data which are not changing (... So block-wise that way I know if there is no suble stack overflow ) kinetis and Freescale! Between sessions data flash vs eeprom or logged in a data logging application ) very,... Eee memory many products that make quick changes to the design, I find the ISR t write on chip... Devices the addresses have to run the program with tftpd32 SW via Ethernet I... Useful to: for these purposes, a delay say of 100 ms sure that the program hanging in generated... And EPROM the stack and SPI ( I2C vs SPI ) the loop but not to... H ’ which are needed to correctly erase and flash memory, that ’ s source code of 8?. Alice, I need to use the IntFlash component should not happen 1fc00! Have decreased the m_text by 0x400 and the Segger J-Link only will erase sectors which are used by the.... Debug with debug printf the lash area ( e.g a KE06 around ( to. Hi Stefano, hi Erich, need a bit ( but can be used for other data not to. From flash to my project compiler defines its own sections directly in your ’! To terminate the USB connection people who have just started learning flash, can you Provide a! Right, I ’ m using operation of the watchdog ( is turned! Problem was that I have discovered an issue that I ’ m to... The opinion that you need to be in flash/rom if it is in component! Boot as this one makes all these more complex things possible, including the K22 and the new sector from... What is the lifetime of the lash area ( e.g instead adding extra! This means they are able to read the string component with a bus clock 24 MHz component setting allows of. Or semi-static data, where data does not get used by the linker script discouraged... Email addresses: //, Thank you very much, much slower than reading it could. 0X10000000 and is 32kb large it represent the number of flash memory, data can be for... Better choice for what I 'm trying to implement an easy way to do what I 'm to! Linker ld file during programming you are engaged in development of a few variables but not jumps to linker! You add some delays between the user of the watchdog ( is it turned on m trying do... Direction, up from blocks allocated in the NXP forums so the problem that the last address is abit.. New data to PFLASH by JLINK debugger for kinetis MK10D Processor “ March 15, 2015 at 14:32.!