Flash W25 reading doesn't work

[Osta]

Hello I use Atmega128 processor and AT25F4096 memory.
Writing to memory works correctly but reading always returns 1.

[Osta]

Found my mistake, but the question remains...

[BenR]

Hello,

You might need to erase the block first before you try and program the location. Though 255 would potentially indicate an unprogrammed location.

[Osta]

Erasing does nothing!
Cleaning up didn't do anything either.
Made a write / read loop and the loop stops.
the program hangs. Recording doesn't work.
Only reading works.

[BenR]

Hello,

What do you have the WP pin connected to?

[Osta]

WP connected to VCC

[Osta]

Everything works in Proteus but not in hardware.
If connected according to the data sheet, the MISO and MOSI pins are reversed

[Osta]

When connected according to the datasheet, there is not even a read.
And if the pins MOSI and MISO swap places, the chip returns 255. This is the default value.
In the program you can see that I set the value to 0 and the return value to 255. So the reading is done. But the sector is not unlocked and therefore not written.
Respectfully Osta

[Osta]

Moreover, the program makes one iteration and stops at one of the commands.

[Osta]

It's in PROTEUS.