Author: [email protected]
Date: Tue Apr 21 15:38:41 2009
New Revision: 938
Modified:
trunk/include/peripheral/usb/usb_drv_cdc_class.jal
Log:
fixed empty packet transmission, removed explicit RX FIFO buffer allocation
in dual port memory
Modified: trunk/include/peripheral/usb/usb_drv_cdc_class.jal
==============================================================================
--- trunk/include/peripheral/usb/usb_drv_cdc_class.jal (original)
+++ trunk/include/peripheral/usb/usb_drv_cdc_class.jal Tue Apr 21 15:38:41
2009
@@ -271,6 +271,7 @@
end if
+ var byte bytes_to_send
-- anything in the fifo?
if ( cdc_tx_wr == cdc_tx_rd ) then
@@ -279,22 +280,24 @@
-- nothing to do, so return
return
end if
- end if
+ bytes_to_send = 0
+ else
- var byte bytes_to_send
-
- if ( cdc_tx_wr > cdc_tx_rd ) then
- bytes_to_send = cdc_tx_wr - cdc_tx_rd
- else
- -- to keep it simple, don't support splitted buffers
- -- so we don't have to copy the bytes into another array
- bytes_to_send = USB_CDC_TX_BUFFER_SIZE - cdc_tx_rd
- end if
+ if ( cdc_tx_wr > cdc_tx_rd ) then
+ bytes_to_send = cdc_tx_wr - cdc_tx_rd
+ else
+ -- to keep it simple, don't support splitted buffers
+ -- so we don't have to copy the bytes into another array
+ bytes_to_send = USB_CDC_TX_BUFFER_SIZE - cdc_tx_rd
+ end if
+
+ end if
-- clip to maximum EP transfer size
if ( bytes_to_send > CDC_BULK_IN_EP_SIZE ) then
bytes_to_send = CDC_BULK_IN_EP_SIZE
end if
+
if USB_CDC_DEBUG > 0 then
const byte str[] = "send="
@@ -341,7 +344,7 @@
if (cdc_tx_rd > ( USB_CDC_TX_BUFFER_SIZE - 1 )) then
cdc_tx_rd = 0
- end if
+ end if
-- Mark if we got a full packet (8 bytes),
last_packet_is_full = ( bytes_to_send == 8 )
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