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| author | cpldcpu <cpldcpu@gmail.com> | 2015-07-26 19:41:15 +0200 |
|---|---|---|
| committer | cpldcpu <cpldcpu@gmail.com> | 2015-07-26 19:41:15 +0200 |
| commit | 39588ecd592c85544cced1961ba6ae875c9695ef (patch) | |
| tree | 16ddf524e49768ac18069019e4d1c26d6f50f8a5 | |
| parent | 8fd935fa941ba3844818a3b739de26cdbe5892e4 (diff) | |
| download | micronucleus-39588ecd592c85544cced1961ba6ae875c9695ef.tar.gz micronucleus-39588ecd592c85544cced1961ba6ae875c9695ef.tar.bz2 micronucleus-39588ecd592c85544cced1961ba6ae875c9695ef.zip | |
firmware: Use fast CRC when cpu clock is below 16MHz to fix USB3.0 port timeouts.
| -rw-r--r-- | firmware/usbconfig.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/firmware/usbconfig.h b/firmware/usbconfig.h index 65864df..7ca31c5 100644 --- a/firmware/usbconfig.h +++ b/firmware/usbconfig.h @@ -184,7 +184,18 @@ return;\ /* define this macro to 1 if you want the function usbMeasureFrameLength() * compiled in. This function can be used to calibrate the AVR's RC oscillator. */ -#define USB_USE_FAST_CRC 0 + + +#if USB_CFG_CLOCK_KHZ<16000 + #define USB_USE_FAST_CRC 1 +#else + #define USB_USE_FAST_CRC 0 +#endif + +/* If the CPU clock is below 16Mhz you have to use the faster CRC routines. + * otherwise time outs may occur on USB3.0 ports. This adds 20 bytes. + */ + /* The assembler module has two implementations for the CRC algorithm. One is * faster, the other is smaller. This CRC routine is only used for transmitted * messages where timing is not critical. The faster routine needs 31 cycles |