mentor/dcd_musb - Fix issue reading and writing to USBFIFOn register #3017
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For a single packet read and write operations must pick either 32-bit, 16-bit or 8-bit read or write operations. Mixing and matching can cause corruption of data. This becomes a bigger issue when using TinyUSB fifo that has to deal with wrapping since read/write operations may be split between multiple transfers of different sizes. Therefore, create a function that will determine which operation can be used for transfer the entire buffer of data. Then read and write operations can use a parameter to determine what should be used. Signed-off-by: Franklin Cooper Jr <[email protected]>
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Thank you for the fix, but the logic can be better. For example non-fifo based 11 bytes transfer can be
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Signed-off-by: Mengsk <[email protected]>
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@fcooperti, please test my last commit. After checking kernel source code, the access width change is not limited to the latest operation, for example 32b+16b+8b is allowed for 7 bytes I/O (not limited to 3*16b+8b). I've updated the logic to make access width limit only applied to wrapped fifo part while keeping normal transfer and linear fifo part untouched. |
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@fcooperti Hello, are you still on this ? |
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For a single packet read and write operations must pick either 32-bit, 16-bit or 8-bit read or write operations. Mixing and matching can cause corruption of data.
This becomes a bigger issue when using TinyUSB fifo that has to deal with wrapping since read/write operations may be split between multiple transfers of different sizes.
Therefore, create a function that will determine which operation can be used for transfer the entire buffer of data. Then read and write operations can use a parameter to determine what should be used.
fixes #3010