[PIC] How to stored frequency to eprom

Hi There,
I am a newbie, could anyone help me to solved my problem, here are :


That mean once pressed the button on PORTA.F1 then will stored to latest frequency pressed.

Thanks.
Jared.

Not clear what exactly you want to do, but this code will not work as you expect.
The use of Delay() functions during reading of one button will lock the reading of another button in the meantime.

Also be careful of making frequent updates to a value in EPROM ( which I assume is actually an EEPROM). Normally EEPROMs have a fairly limited number of erase/write cycles (typically in the 100,000's) and if you are trying to write to the EEPROM after each button press then this could be exhausted in a fairly short period of time after which you will start to get errors.
A better idea is to keep the frequency (which I assume you are increasing by pressing a button on RA0 and decreasing by pressing RA1) in RAM and then store it to EEPROM either just before the device is turned off or some period after the last change.
Why not use the same variable that you are increasing and decreasing? This code looks a bit sloppy to me but we are really just guessing at what you are really trying to do.
I assume that you are using the delay as a key debounce technique.
Susan

Aussie Susan said:

Also be careful of making frequent updates to a value in EPROM ( which I assume is actually an EEPROM). Normally EEPROMs have a fairly limited number of erase/write cycles (typically in the 100,000's) and if you are trying to write to the EEPROM after each button press then this could be exhausted in a fairly short period of time after which you will start to get errors.

Click to expand...

Or it completely dies...Back in the early days of the technology <10,000 cycles were typical and when your firmware/software engineer decides they need to have a power on test of everything on the board (including the eeprom)...read, erase , write 5A5A, read, erase, write A5A5, read, erase, write pattern F0F0, read, erase, write 0F0F, read, erase, write address, read, erase, write original data.