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write_program_memory doesn't work properly

 
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naughty_mark



Joined: 29 Aug 2012
Posts: 97

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write_program_memory doesn't work properly
PostPosted: Sun Sep 16, 2012 5:00 pm     Reply with quote
Dear All,

I met a problem with write_program_memory. I am using MPLAB with CCS v4.133 and work with dsPIC33EP256MU814
Code:

write_program_memory(ProgAddress,HexRecordSt.Hex_Data, HexRecordSt.RecDataLen);

The ProgAddress is 0x10000, and HexRecordSt.Hex_Data is pointer pointing to the start address of an array. and HexRecordSt.RecDataLen is a 16bits word which should be less than 512.
The hex I write it in like
Code:

:10000000C1E8A8000E2EEF001E2EEF002E2EEF00EE
:100010003E2EEF004E2EEF005E2EEF006E2EEF0014
:100020000FF82600F0FF260020A0B7000000000017

however, after I write in those data in and read them out, it is
Code:
:
:10000000E8A800002EEF00002EEF00002EEF000009
:100010002EEF00002EEF00002EEF00002EEF00006C
:10002000F8260000FF260000A0B700000000000036

as you can see the first byte of every segment is replaced by 0x00. I have 0x00 at the forth byte and did many times debugging to make sure that the pointer points to the correct address, and the length is right.
Anyone has idea about it?
Thanks a lot

EDIT: I tried a test code which just write 512 byte to 0x10000, it was correct, the only different between the test code and my program is the test code is from the beginning of the string to write in, and my program start address is the fifth byte of the string. Shocked

EDIT: never mind, guys. I transfer the data to a new array which will be read from the 1st byte of the array, and it works. It looks this function has many bugs. Be careful to use it
jeremiah



Joined: 20 Jul 2010
Posts: 1349

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PostPosted: Mon Sep 17, 2012 6:15 am     Reply with quote
I may be misunderstanding what you are saying, but if just transferring the data from one array to another fixes your issue, then it wouldn't be the write_program_memory() function that is at issue as the transfer happens outside the function.

It would be easier to tell if you posted the code for reading, the code for writing, and the code that defines the type for HexRecordSt.
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Mon Sep 17, 2012 7:31 am     Reply with quote
I'm not aware of a bug in write_program_memory(). Without a compilable example that can be
verified for correctness, I rather assume an error in your code.
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