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| author | Christian Starkjohann <cs+github@obdev.at> | 2009-08-12 16:30:23 +0000 |
|---|---|---|
| committer | Christian Starkjohann <cs+github@obdev.at> | 2009-08-12 16:30:23 +0000 |
| commit | 621b168b700396caa9569ebb645511492817c748 (patch) | |
| tree | 07131a9d18c0d30a4d6463e472dda7ffc0d6ff03 /usbdrv/usbconfig-prototype.h | |
| parent | 3aa5195808868206835073e3c1a638a5973e20d8 (diff) | |
| download | v-usb-621b168b700396caa9569ebb645511492817c748.tar.gz v-usb-621b168b700396caa9569ebb645511492817c748.tar.bz2 v-usb-621b168b700396caa9569ebb645511492817c748.zip | |
- added option for fast CRC routine
- optimized conventional CRC routine somewhat
Diffstat (limited to 'usbdrv/usbconfig-prototype.h')
| -rw-r--r-- | usbdrv/usbconfig-prototype.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/usbdrv/usbconfig-prototype.h b/usbdrv/usbconfig-prototype.h index 71c7acf..238b45a 100644 --- a/usbdrv/usbconfig-prototype.h +++ b/usbdrv/usbconfig-prototype.h @@ -201,6 +201,14 @@ section at the end of this file). /* 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 +/* 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 + * per byte while the smaller one needs 61 to 69 cycles. The faster routine + * may be worth the 32 bytes bigger code size if you transmit lots of data and + * run the AVR close to its limit. + */ /* -------------------------- Device Description --------------------------- */ |