DS24xx one wire EEprom Application Register

[Anonymous]

Hi,first of all thank you for your programmer , its an amazing job ... I started this topic because im trying to write a Ds2430 Eeprom, it is possible to write the Program Memory, but actually there is a one time programable 64 bit Application Register that im not able to program , but it reads the Opgui program when I read out the chip, there is any way to program this part of the EEprom ? Could be implemented maybe in the next update ?

Thank you very much..
All the best : Szabi

[Alberto Maccioni]

Writing the application register requires a series of manual insructions to be sent directly to the programmer by using "op -command".
The instructions that deal with OneWire devices are (from instructions.h):
OW_RESET 0x40
OW_WRITE 0x41 // + # of bytes + bytes
OW_READ 0x42 //+ # of bytes required
First thing is to turn on VCC.
All commands given to OW devices start with a reset; addressing a single device on the bus requires sending 0xCC (SKIP ROM).
In order to write the application register you first need to write 0x99 + starting address (e.g. 0) + data bytes. It is possible to read back the data to check if it was correctly received.
Then sending 0x5A & 0xA5 transfers all data to the application register and locks it.
In the end here is the sequence:
op.exe -command 6 3B E 1
op.exe -command 40 41 B CC 99 0 XX XX XX XX XX XX XX XX
The following reads back data:
op.exe -command 40 41 3 CC C3 0 42 8
If data matches it can be written permanently:
op.exe -command 40 41 3 CC 5A A5

This was never actually tried, so let me know how it works.

[Anonymous]

Sorry I just had time today to try it, but YES it works :) I can write the App.Register like this..Thank you very much..
All the best . Szabi

[Anonymous]

Sorry I just had time today to try it, but YES it works :) I can write the App.Register like this..Thank you very much..
All the best . Szabi