Receiving wrong values from four 32000 char arrays (Arduino Mega)

[Whandall]

Have a look at #9 and use GET_FAR_ADDRESS with pgm_read_byte_far.

Just a newby asking the 64k question again - Arduino Mega2560

This looks like a winner. pgm_read_byte is functionally, pgm_read_byte_near. What we need is 'pgm_read_byte_far' which accepts a 32-bit pointer allowing us to access the second half of flash. ( 64K words = 128K bytes ). This macro below translates a PGM (16 bit ) address to a far PGM ( 24-bit, stored as a 32-bit ) address. So basically, use GET_FAR_ADDRESS to 'get' the address, then use pgm_read_byte_far to read the data. All the normal *_P functions only support near addresses, you'll have…