Changes between Version 6 and Version 7 of FreeRunnerLEDs


Ignore:
Timestamp:
2010-06-29T21:32:12Z (14 years ago)
Author:
Jiri Svoboda
Comment:

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  • FreeRunnerLEDs

    v6 v7  
    3131
    3232'''Notes:'''
    33  * Verified by accessing physical memory via /dev/mem in Om 2008.
    34  * From the documentation I've seen it is not clear whether the registers are sensitive to endianness and if so, what their endianness is. Little-endian access works.
    3533 * Could not find in datasheet whether H drive is coded as 1 or 0. From experiments 1 is H because 1 lights the LED.
     34
     35== I/O registers vs. endianity ==
     36All the I/O registers on the S3C24xx are naturally 32-bit. This means if you access them as 32-bit memory locations, you needn't worry about endianity (recommended). If you need to access them as 8-bit memory locations, the GTA02 memory system is little-endinan. You would thus use the same address for the 8-bit access as for the 32-bit access in order to read or write the least significant byte.