All sw was generated using and the project is for. Are there any industry standards that other applications and embedded devices use for this purpose? Hi Geoff, using individual variables and ranges are preferred for me if I have different versions of the firmware, where the not every version of the firmware needs all variables. I have aproblem when I debug the code. Hi Erich, Thanks for your reply. Then, a new record can be created. How do i arrive at this value? Hi Eric, Thanks for the answer, I understand.
} Then, the caller picks an arbitrary address for the struct and needs to ensure that no other struct is written on top of it. The following listing shows an example. For create an error on eeprom storage, change one value in the write eeprom function shown below main. I am using the Code Sourcery G++ Lite gcc compiler with the optimization flag set to optimize size Os. Yes its basic c stuff, but whats there is correct, its me not explaining properly again , but I am trying! Hi Erich, Thanks for the post, it has been very useful.
What are the software techniques for this? Thank you in advance for the help! You need to remember that nobody knows anything about you or your project other than what you clearly and explicitly explain in your posts. I have discovered an issue that I believe may be a bug in processor expert. I never have used in that way. I thought about adding a section in the linker script and use gcc's section attribute and place my structs in this section but that would end up in the Flash and would use memory just for the sake of generating addresses. 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.
Can you increase the stack size to be sure that there is no suble stack overflow? With this, no external parts are needed, and usually there is plenty of room left on the microcontroller to store things like settings or calibration data. I have projects with the IntFlash component and the TimerInterrupt one working side-by-side, so not sure why you see an issue? I believe I have a project somewhere using it on GitHub, but did not check. Is there a way to put a variable in the flash at a specific memory location. Yes it is a problem with the loop counter after optimization. Does anyone know who wrote this library and what license it is under? Usually the full page needs to be erased first before being programmed.
That way I can easily turn things off. You may want to read up on that topic and explore solutions like. I am changing how the data is organized in the flash. I tried to write eepron form many timest while testing the system. From what I recall the code in the library is not that complicated, so you could take a look at the code to see if you can spot any bugs that cause the result you are seeing.
I searched and grepped for any occurrances where the variable might be used without luck. You can see it is not a flash address, So please help me to store a value in flash if you have time. Hello Erich, Thank you for yet another great posting. Does anyone have solved this problem before? We want to keep to a page to ensure we work only within a page and don't mess things up. You can then write to it without exceptions if it is sector aligned. All invalidated records can be ignored. I found these interesting articles describing how using a table and only erasing garbage collecting when needed.
I am trying to implement a similar use of internal Flash for non-volatile data storage. In return for using our software for free, we request you play fair and do your bit to help others! Theres a note at the top of most of the app note code but its not a licence. First things first Knowledge of what you are doing is critical here. So an erase operation will erase that full block, and that when I allocate my data blocks below, it has to be aligned on that boundary and size. I have setup a loop that counts the number of seconds.
Thanks :- ps why does my flag show as American? But I have another problem before that. That way I know if there is already configuration data present or not. Why not using the microprocessor internal flash memory? As for software, just ensure that the beginning and end of each erase and write operation have some identifiable effect, so there is a record upon reboot. We have lots of critical real-time control and floating point, so not running at 120Mhz is not an option. I prefer to use the SetBlockFlash as with it I can write any size of data. After writing the new record in flash page 1 and creating the page header to indicate that flash page 1 now contains the current value, we invalidate flash page 0 write 0x55 to bytes 2-3 and the last record in flash page 0 write 0x55 to the last record's header byte 1. Flash page 0 is garbage collected erased Finally, flash page 0 can be erased when the system finds it convenient.
This takes both time and energy, which is critical if I want to do this while the microcontroller is shutting down because of a power loss. Hello Mr Styger, best wishes for 2015! When this flash page fills up and I start a new flash page, I will write 0x5555 over bytes 2-3. Here's a simple, concrete algorithm example: Let's say I have a data set of 6 bytes. Richard Handley again, very valid points! I have the buffer type implemented by the method. Record header For each record, I will start with a header also. Hi Erich, great tutorial, as you usually do.