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Sending data from PPC to MSP430

Zvi Vered
Expert 2010 points


Hello,

I'm sending data from PPC405 CPU to MSP430 via I2C.

The data is a structure that contains few 32bits fields (unsigned long)

The PPC405 is big endian. The MSP430 is little endian.

But for some reason, when I'm sending the data I do not have to run "htonl" (byte swap) on the data received in the MSP430.

When I'm sending data from PPC405 to x86, I have to run "htonl" in the x86. 

Can you explain this ?

Thanks,

Zvika 

  • 0
    Guru 227245 points

    Zvi Vered said:
    Can you explain this ?

    No. Except for the fact that I2C itself doesn't care for endianess. It always transfers bytes. Whether 4 bytes form a DWORD and which is the MSB and which the LSB is a don't care for I2C.
    So how do you receive the bytes on the MSP might shed some light on your question. Without knowing your code, nobody but you can tell.

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