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| author | Marti Bolivar <mbolivar@leaflabs.com> | 2012-08-03 23:15:43 -0400 |
|---|---|---|
| committer | Marti Bolivar <mbolivar@leaflabs.com> | 2012-08-03 23:15:43 -0400 |
| commit | e5b44c156519598721979fd6cfa9f516198fc4f0 (patch) | |
| tree | d668854ef17e7c79cd6ac2480880ae10648c4056 | |
| parent | f0b894fca7a56b8172bb0dff89283843dcd9d200 (diff) | |
| download | librambutan-e5b44c156519598721979fd6cfa9f516198fc4f0.tar.gz librambutan-e5b44c156519598721979fd6cfa9f516198fc4f0.zip | |
usb_cdcacm: Improve write speed.
Actually fill the TX buffer in the packet memory area, so we can send
more bytes per transaction. Using the test-session benchmark, we're
now clocking in the high 700KB/sec range via PySerial. With screen,
rate is now about 550 KB/sec.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
| -rw-r--r-- | libmaple/usb/stm32f1/usb_cdcacm.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/libmaple/usb/stm32f1/usb_cdcacm.c b/libmaple/usb/stm32f1/usb_cdcacm.c index df9e6ea..e664797 100644 --- a/libmaple/usb/stm32f1/usb_cdcacm.c +++ b/libmaple/usb/stm32f1/usb_cdcacm.c @@ -434,10 +434,9 @@ uint32 usb_cdcacm_tx(const uint8* buf, uint32 len) { return 0; } - // We can only put USB_CDCACM_TX_EPSIZE bytes in the buffer - /* FIXME then why are we only copying half as many? */ - if (len > USB_CDCACM_TX_EPSIZE / 2) { - len = USB_CDCACM_TX_EPSIZE / 2; + /* We can only put USB_CDCACM_TX_EPSIZE bytes in the buffer. */ + if (len > USB_CDCACM_TX_EPSIZE) { + len = USB_CDCACM_TX_EPSIZE; } /* Queue bytes for sending */ |