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j_random_hacker | Hi all, just wondering if anyone has had any success increasing the USB transfer buffer size to 512 bytes on the Tomu? I can increase it to 448 without problems, but I get instability at 512. Any ideas? | 13:46 |
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j_random_hacker | Also wondering if anyone knows of a comms library that uses the USB unit's DMA. libopencm3's USB library (which I'm currently using/adapting) uses programmed I/O, which burns precious CPU cycles. One issue I see is that the USB's own DMA mechanism seems to be all-or-nothing -- AFAIK you can't turn it on for just one endpoint, and use programmed I/O | 13:51 |
j_random_hacker | for the others. Alternatively has anyone had success in using the EFM32HG's own DMA unit to write to the USB? | 13:51 |
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