usb_cdc: Try to read new data before processing data blocks
Call usb_read_bulk_out() before calling command_find_and_dispatch() as this optimizes the common case where each usb packet contains a single new message block. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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@ -92,8 +92,19 @@ usb_bulk_out_task(void)
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{
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if (!sched_check_wake(&usb_bulk_out_wake))
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return;
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// Process any existing message blocks
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// Read data
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uint_fast8_t rpos = receive_pos, pop_count;
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if (rpos + USB_CDC_EP_BULK_OUT_SIZE <= sizeof(receive_buf)) {
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int_fast8_t ret = usb_read_bulk_out(
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&receive_buf[rpos], USB_CDC_EP_BULK_OUT_SIZE);
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if (ret > 0) {
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rpos += ret;
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usb_notify_bulk_out();
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}
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} else {
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usb_notify_bulk_out();
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}
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// Process a message block
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int_fast8_t ret = command_find_and_dispatch(receive_buf, rpos, &pop_count);
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if (ret) {
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// Move buffer
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@ -104,14 +115,6 @@ usb_bulk_out_task(void)
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}
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rpos = needcopy;
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}
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// Read more data
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if (rpos + USB_CDC_EP_BULK_OUT_SIZE <= sizeof(receive_buf)) {
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ret = usb_read_bulk_out(&receive_buf[rpos], USB_CDC_EP_BULK_OUT_SIZE);
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if (ret > 0) {
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rpos += ret;
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usb_notify_bulk_out();
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}
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}
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receive_pos = rpos;
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}
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DECL_TASK(usb_bulk_out_task);
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