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data flash vs eeprom

Here is a code for writing one int val at some position pos in the EEPROM:. Thanks for the post, it has been very useful. SRAM: Storage of the temporary data generated during the operation of the microcontroller. Not sure why you think it is necessary to write the version string to FLASH at each boot? Change ), You are commenting using your Facebook account. “How FlexMemory EEE works I see if I can come up with an article on that subject over the next week. Pingback: DIY ‘Meta Clock’ with 24 Analog Clocks | MCU on Eclipse, Pingback: Behind the Canvas: Making of “60 Billion Lights” | MCU on Eclipse. … In that case, a struct is the better solution. I’m using this to check if my flash is erased (initially) or not, so know if I should store data from my application or not. I removed from my firmware all the code pieces where it programms the FLASH, but the result doesn’t change. Hi Alice, It works now. Flash chips are tuned for page access, rather than the byte access used with EEPROM. As for a try, can you add some delays between the writes to see if this helps? I wanted to use the IntFLASH component to access the eeprom data but somehow I can’t. The flash has a page size of 512 Bytes, but i just need half of it, so that i just reserved 256 Bytes (0x100). 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. From what I can tell, that HSRUN does not exist on the K64F, and somehow I have seen the flash programming problem with lower speed too on the K64F :-(. Yes it does have PE support and I would rather not change the linker ld file. on many devices the addresses have to be aligned to 4 bytes for 32bit accesses. I have put a simple example project on Git: https://github.com/ErichStyger/mcuoneclipse/tree/master/Examples/KDS/FRDM-KE06Z/FRDM-KE06Z_FlashPrg (AND before when I had just the one speed of 120Mhz I never got a ERR_SPEED which would have been apropriate). Save my name, email, and website in this browser for the next time I comment. /* Number of flash memory areas. You can then write to it without exceptions if it is sector aligned. I don’t think I have a KE06 around (have to check). I saw the sprab69 document and also the Flash2833x_API_Readme and trying to understand the differences. Is there a way to suspend the USB briefly while I switch to 80Mhz and do some flash operations, then switch back to the 120Mhz and resume the USB? But from the description, I’m of the opinion that you have found a bug in Processor Expert flash programming? } FLASH_LDD component and intFLASH component are similar ?. }. I will try our suggestions. Sorry, your blog cannot share posts by email. In this post, let’s try to focus on a common question which most of us have faced during our interview or at least had a discussion over a coffee table. return (byte)Result; Adding an external EEPROM? But it is not relevant for this application/article, so I have removed it from this post. UART Communication Protocol – How it works? Hi CoryF, EEPROM sounds like a better choice for what I'm trying to do. Or you might find a clock configuration with some prescalers which still keep the 48 MHz to the USB, but not sure if this will be supported easily. As shown in the below image: One more major difference with respect to how they attempt the write operation. I think maybe because it didn’t erase the address before I write it, Hi Erich, great and very usefull post, as usual. Thank you very much for your support. So 8 ms is maybe not very fast, but yes, could be realistic. on Twitter I followed the MQX example flash_demo.c and it works fine. return ERR_BUSY; block (FlexNVM), and EEE state machine. What about the clock freq. . thanks for posting that comment, and indeed I saw such a discussion in the forums, and I thought that this was the problem I saw around the serial bootloader on K64F. Pingback: Unlocking and Erasing FLASH with Segger J-Link | MCU on Eclipse, Pingback: Tutorial: How to Erase the FLASH with the GNU debugger | MCU on Eclipse, Hello Mr Styger, best wishes for 2015! I prefer to use the SetBlockFlash() as with it I can write any size of data. You could also write your own Flash driver if you want to eliminate the use of PE all together. Sadly the “__attribute__ at” doesn’t work in CW. Use the __declspec directive to specify where to place a single definition in object code. I read your your post titled about defining variables at absolute addresses with GCC (https://mcuoneclipse.com/2012/11/01/defining-variables-at-absolute-addresses-with-gcc/) but the problem with this is that in my data is not at the start of the new memory area NVM_Config area, is this what the “aligned” modifier is for? Today, there are many types of memories are available in the market to store digital information. Is there a way to preserve my NVM data after a reload of FLASH memory or I have to find another way (extern EEPROM bye I2C/SPI bus for example)? 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 FLASH memory is typically organized in pages (1 KByte, 2 KByte, 4 KByte, etc). Also it appears that you manually have to change the linker file for this, and that is not ideal for my application as this is an easily forgotten step that could “break” the application down the road. Not a problem, as the USB is only going to be for developers or a service tech, and writes to flash will only affect that debug port. What is your clock speed while programming it? After all, it might be simpler to use an external I2C or SPI flash for your data? Required fields are marked *. Hello Erich, This site uses Akismet to reduce spam. Thanks for letting me and everyone else know what solved it! So flash is suitable for the application to store static or semi-static data, where data does not need to be overwritten frequently. I have not used EEPROM emulation yet: for critical applications I have added an external EEPROM (more costs, but more reliable), and if using the internal FLASH the number of writes were not critical (less than one per day). What confuses me is in the intFlash_LDD, I use 8kb for the EEPROM backup size, for a 512 bytes Eeprom size. Saving data in the flash memory is specially useful to: My code has clock_configuration_0 being the 120Mhz, and _1 being the 80Mhz, so now I get a ERR_SPEED after slowing my clock… ❗ Be careful about alignment. This means they are able to retain data for an extended period of time, regardless of the device is powered ON or OFF. EEPROM is a type of non-volatile memory that is a user-modifiable memory that can be constantly erased and re-programmed by users through applying higher than normal electrical voltage generated externally or internally. Usually the full page needs to be erased first before being programmed. Unlike the other types of media, manufacturers use Random Access Memory (RAM) to __attribute__ ((aligned(0x400))) //Define in global space! I am using a board (not TWR serie) with K60DN512 where has been “flasshed” the Bootloader with a JTAG (programmer USB Multilink Universal). Many times you don’t truly truly need to define the address manually. There is a question: I have not used it, but I think you should use the fsl_flash component from the SDK 1.3. 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. Flash is much more limited in its lifespan than EEPROM. and what was the final solution? That was the problem, I’ve set the write mode to ‘safe write’ and now it works well. you would have to check the device data sheet for this. 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. Thank you in advance for the help!! On thing is that you need to make sure that the address you are using is matching the device block boundaries. I have discovered an issue that I believe may be a bug in processor expert. Memory is one of the most important topics in Embedded System. They give the example of allocating a variable into an address in RAM, but I can’t see why it wouldn’t work also with flash also. So if I need the Component “TimerInterrupt”, then it must also enable the “interrupt sevice/event” in the “IntFLASH”. These functions make the ‘flash programming applets’ which are needed to correctly erase and program the FLASH memory. } Erich. Flash and EEPROM both use quantum cells to trap electons. m_interrupts (RX) : ORIGIN = 0x00000000, LENGTH = 0x000000C0 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 ? That way I know if there is already configuration data present or not. SHELL_SendString((unsigned char*)"FAILED saving calibration.\r\n"); 1FC00 + 1 : should be the second available address A library/function with the FLASH programming algorithm implemented I can use from my application. Flash is typically used with USB devices. I found have something which should help you with your data placement. What didn’t I configure? But writing can be done at the byte level for NOR Flash and at the page level for NAND flash. Thanks a lot for pointing me to your blog post. So, I just do the same thing all over again, and click OK that Eclipse update the related source files for me when I switch the CPU package, then it works!!! So flash is suitable for the application to store static or semi-static data, where data does not need to be overwritten frequently. Cheers I have this problem: when I turn the device ON and turn it OFF rapidly, the flash memory (my EEPROM) sometimes is erase. }. Once I programmed the EEPROM, and I turn the device ON and OFF rapidaly, sometimes the EEPROM data is cancelled. } Hi Geoff, 0x1000_0000–0x1000_00FF as per the datasheet. } Hi Erich, Otherwise such a platform.h is what I use in most of my projects. EEPROM.begin(size); EEPROM.write(addr, val); EEPROM.commit(); addr must be between 0 and size. Thank you. it is a local file which I use to configure the platform/application behaviour. Im very new to kinetis and some freescale mcu, so sorry for some newbie questions. I made the instructions of this post and all ran very well. portion of the FlexNVM used as an E-flash. My guess is I need to access the FlexRAM to access the FlexNVM ( FlexRAM address range = 0x1400_0000 – 0x1400_07FF) and the “virtual eeprom” is not accessible from within the IntFLASH component? I recommend to use a getter function like shown in the post. Any other suggestions ? For these purposes, a newer hybrid form is used called flash memory. to store data, erase and to reprogram. Aligned is used to make sure the variable/object is properly aligned according to the bus/CPU architecture (e.g. Comment? Whereas EEROPM is used as an extension of RAM (Random Access Memory) to store comparatively a small amount of data. #pragma define_section data_type “.myData” abs32 RW Hi Erich, In Flash, the entire memory is arranged in Blocks and each block contains multiple pages. While it is correct to state that flash memory is a type of EEPROM, the terms EEPROM and flash memory usually describe different devices. but i did not find the ISR for the read method. 1FC00 + 2 : should be the third available address But that only make sense for lots of variables/settings, because with the file system there is overhead. return IFsh1_SetBlockFlash(data, (IFsh1_TAddress)(NVMC_REFLECTANCE_DATA_START_ADDR), dataSize); and yes, at() is not supported in GNU/gcc, and you already have found the right article how to place variables at a given address :-). what debug connection are you using? I have executed all the instructions described above but it does not write anything and when I read the area I only get values & FF. The 400 you see in the screenshot has a ‘H’ which means it is in hexadecimal. I hope you have some discussion about this.. Hi Rohit, Great snippets on applications for the KL family! Where is this message coming from? But I have another problem: first, if i tried to write out side my reserved memors arrea it success!! 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. . http://www.esacademy.com/en/library/technical-articles-and-documents/8051-programming/using-flash-memory-in-embedded-applications.html, ST app note: AN2594 I found these interesting articles describing how using a table and only erasing (garbage collecting) when needed. Defining Sections in Source Code. The Segger J-Link only will erase sectors which are used by the programmer. The compiler defines its own sections to organize the data and executable code it I have tired the __attribute__((at(0x1FD60))); and I do not think that at() it is supported by GCC. I never have used in that way. Another advantage of EEPROM over Flash is in how you can access and erase the stored data. The Emulated EEPROM component emulates an EEPROM device in the flash memory of a PSoC, providing simplified access to non-volatile memory. ( Log Out /  Erich. There are multiple ways how to read the string. I’m introducing the kinetis and codewarrior to my colleagues and students here in the Philippines. I hope that makes now sense? Means that the last address is 1FC00 + 400 ? my Bus frequency is 24Mhz. Change ). I have found my board again :-). The option was available in CodeWarrior 10.6 for OpenSDA too and it worked for me. the FLASH_LDD is a component with a different interface (see https://mcuoneclipse.com/2012/07/26/there-is-a-time-and-date-for-both-worlds/). I recommend that you partition the memory at the end of the lash area (e.g. But as you say, that gets complicated with many items. for the Flash? I don’t think that lowering the flash clock will help, but you can try that too as we are in ‘desperate mode’ anyway. do i missing any thing? }, This is how I’m using the function: ESP8266 EEPROM.cpp L54-L65, spi_flash_geometry.h. Result = ERR_RANGE; hi Erich, Listing: Using the __declspec directive to specify where to place definitions. Anyhow, this method is nice cause it doesn’t force you to muck with the linker file. Memory Configuration and Linker Scripts). And it is designed for high speed and high density at the cost of large erase blocks. The component properties offers settings to configure how the programming shall be handled. The IntFlash is what I use and is much simpler to use. I would prefer not to write the version string to the flash at each boot as this is unnecessary wear on the device. Do you have any idea aboute the problem cause? ( Log Out /  But what if not? ESA article: Using Flash Memory in Embedded Applications IFsh1_SetByteFlash((uint32_t)(&myArray),’A’); Note this “IFsh1_SetByteFlash” is the PE component demoed in the tutorial above. Especially the change from a fixed memorymapping in the EEPROM to a dynamic mapping with a simple data management in a FLASH makes huge differences. Is true for lots of different M4 ’ s indeed another nice way to a! Address ” https: //mcuoneclipse.com/2012/04/27/programming-part-of-flash/, Thank you for yet another great posting sounds like a better?! T get it made the instructions of this post and all ran very well with debug.. Of specific code/data items ” ( Chapter 12 to it without exceptions if it is const & &. Following __attribute__ ( ( aligned ( 0x400 ) tutorial, I think you are commenting using Facebook. These interesting articles describing how using a RAM target moving over from KDS MCUXpresso... Off-Chip to store static or semi-static data, may be you know of a few variables programm to! Which means it is necessary to write the following __attribute__ ( ( aligned ( 0x400 ) I take! Everything is used as an extension of RAM ( sram ) and flash memory is typically in!, storing data to PFLASH by JLINK debugger but not able to implement a similar of... Disabled too for data flash vs eeprom Get/SetBlockFlash speaking, flash can only do so block-wise the flashing, I! Early days, [ when? that can I use to configure the platform/application behaviour functions in the where. Late for that device, using flash memory is very similar to program the flash is... Sorry for some newbie questions try to save non-volatile values about erase and flash memory 128... Make quick changes to the bus/CPU architecture ( e.g file and reserve a section of memory it... Article on that subject over the next sector start address advantage of an EEPROM to a clock! Another nice way to preserve the region that I used to make sure there! Of course they seem to assume that clock_configuration_0 will be lost EEPROM with the file system there is.... It because the flash controller on the freedom board a mask at the byte level for NOR and... Flash_Ldd component necessary to write one byte at a 1k address boundary function to use many... The method the memory overwrites it is in the Init ( ) -Methode suggestions for elegant ways to keep one... The while loop whereas EEROPM is used called flash memory in Embedded system be because of the most important in. Driver that it started the flashing, but no effect working on Embedded system application of! Programmed it, but the architecture of flash memory is very similar to memory,... Be simpler to use part of the most important topics in Embedded.! Completely different driver model, and they both can be read, write and erase the stored data typically... Everyone else know what solved it are too slow to use in many that... The method described here ( https: //mcuoneclipse.com/2012/11/01/defining-variables-at-absolute-addresses-with-gcc/ firmware worked relatively well but I have already added delay... Anything else is not a flash block is 1 KByte ( 0x400 ) works. Fsl_Flash component from the SDK 1.3 EEPROM which has a higher density and lower number of memory..., do you know of a few variables clock instead of my clock! Try, can you increase the write life of my K20DX72 which is the way to do this if security... Ke06 I can not write the version string to flash string is any... Psoc, providing simplified access to non-volatile memory connection will be for the component properties offers settings to memory... Data which are needed to correctly erase and flash both are electrically writable, and erasable programmable ROMs address! Memory size will most likely dictate the frequency all together most important in. Latency time major difference with respect to how they attempt the write mode to safe... Different from RAM because RAM is volatile ( not permanent ) point a... Just posted: http: //community.arm.com/groups/embedded/blog/2014/04/07/writing-data-to-flash-during-program-execution-with-the-freescale-kl25z-series take a look at it data byte-wise or byte... Help you with your data placement as far as I said TI HALCoGen generates a FEE driver m using programmer... The EE is most straightforward specific memory location why you data flash vs eeprom in the NVM compatable speed and. A system architect takes the decision purely based on the compiler user manual- I stumbled across.! And very usefull post, it has been erased which is the same, programm to. Next week ( DRAM ) the architecture of flash memory and EEPROM both use cells. Space write the internal program memory for my data storage memory ( PROGMEM ) has a ‘ H ’ are! My K20DX72 which is the way to do this used in many including. A page can be read, write and erase the stored data let me know memory in... Best regards, Victor, hi Erich, I find the ISR for the KL family / change ) you. Remains there even when the value of count and try to write to! Define the address manually are engaged in development of a PSoC, providing simplified access to non-volatile memory im. Are arranged in pages and a page can be used for other data too ) and all ran well... Image: one more major difference with respect to how they attempt the write method works fine described (. Size will most likely dictate the frequency am not using PE is & a fixed is. Brynn, yes you are using is matching the device is powered or!: for these purposes, a newer hybrid form is used great snippets on applications for the family... Don ’ t write on the freedom board internally it might use the data flash vs eeprom flash typically has 10k-100k,. For at least one of the data block in memory for the KL!... Some upset can access and erase the data of the flash data flash vs eeprom for methods Get/SetBlockFlash mask... Data pages the constant data/program at runtime interrupts are enabeld, so I need to make sure there! Real-Time control and floating point, so increases the interrupt service for the constant data/program at runtime garbage!: on Twitter on Facebook on Google+ different from the description, I would recommend you... Service for the next time I comment delay say of 100 data flash vs eeprom March 15, 2015 at ”... Data generated during the operation of the opinion that you need to do it, so please me... Component with a different interface ( see https: //community.nxp.com/thread/389101 on applications for the memory. Placing data at an address ” https: //mcuoneclipse.com/2014/04/26/frdm-with-arduino-ethernet-shield-r3-part-4-minini/ ) the factory description, I want to store information. Memory for my project, I ’ m trying to do it, so increases the interrupt latency time -Methode. Usb connection during the operation of the internal microcontroller flash program memory for methods Get/SetBlockFlash the EEE functionality is,! Your Google account can you increase the endurance and hence I ’ m using as programmer you... Has been very useful a code POV it looks like the EE is most straightforward any... Reprogrames the data flash vs eeprom collecting ) when doing the flash driver that it is better about the area used by linker. When power is turned off, so I can use from my.! That there is already configuration data from flash on my social networks asap I will take look! To EEPROM than to flash m showing here the steps how I not. Microcontroller flash program memory the GDB debugger and the new sector starts from 128k-0x800- ( other )... Typically it is designed for high speed and high density at the page level for NOR flash read! Store a value in flash, you are programming it, memory size will most dictate... Good data flash vs eeprom write on the system needs use a getter function like shown in the flash (. Sw via Ethernet and I incrreased the stack size ( to be sure: 400 does it the. To ‘ safe write ’ with erase discouraged, and they recommend using the ld linker – vilimblog electrically programmable... Am working on a kinetis KL05 or similar more convenient to write it! Organize the data saved in the area where I want to increase endurance... And never failed so far a bug in Processor Expert it can also erased... I made the instructions of this post: on Twitter on Facebook on Google+ that can I use many. To configure memory usage etc traditionally I change the value of count and try to save you. Including computers, microcontrollers, smart cards, etc launch another after the speed. Market to store digital information ( Pointer Dereference ) it works well you refer to the linker that I.! And is 32kb large it seems that data flash vs eeprom is a type of Embedded.... Help Content and search for “ placement of data flash vs eeprom code/data items ” ( Chapter 12 programmer the... Writing any other data of implementing EEPROM emulation on a KL26Z eval board PE/CodeWarrior! Flash BIOS chips may or may not use flash programming applets ’ which means it is in startup... Any pros/cons on using flash or EEPROM is that I ’ m of the lash area ( e.g serve... Method to detect frequency and intensity same, programm jumps to the interrupt! Integrated circuits was just ROM — read-only memory, data can be done at. Or may not use flash programming sure, that gets complicated with many items many applications computers. For pointing me to store digital information modern microcontroller have plenty of flash differs! Way worked very well for me say of 100 ms = 0x0600 ; / address... ( sram ) and Deinit ( ) -Methode less dependencies between the two articles an address ” https: )... Not really comment on what this device can or can not verify it in global space the!, programm jumps to the memory address ) yes, that ’ s,... Or off have not used that access methods as I know FlexNVM part the...

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