PIC18F242 to 2420 migration => writing eeprom

[Blob]

Good afternoon everyone,


I have a C program running on a PIC18F242. Following our supplier, it is not recommended for new designs.
This and the fact that they become more expensive then the PIC18F2420, made us decide to change.

I use MPLab, CCS compiler.

Compiling my old program for the new PIC, gave me some errors.

First some Fuse-bits, I changed them in the correct names.
only, I am not sure of one: NOOSCEN. I changed into NOIESO, but I'm not sure if this is correct.

secondly, erase_program_eeprom is not supported by PIC18F2420. So I assume it automatically erases when I perform a write-command. (this I am not sure)

Compiling and programming works.

I use the correct #include-file and I select the correct device in the device-list.

But when I send some data to the eeprom with serial connection, it seems not to write the data to the eeprom. It does however receive the data, because I use a handshake protocol.


Has someone any idea about what can be wrong?
Thanks in advance,
Blob,
Belgium

[Ttelmah]

Use NOIESO, NOFCMEN. This turns off all clock oscillator switching.
What makes you say 'erase_program_eeprom' is not supported on the 2420?...
It is.
If you have one of the latest compilers, look at the manual entry for 'write_program_memory'. This explains the difference between this function (which will automatically erase, if you write to the first byte of a block), and the write_program_eeprom function.
On this chip, the program memory write size, and erase size are the same, so erasing should be automatic in normal circumstances.

Best Wishes

[Blob]