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Slight optimization for cdc tx refill

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Gavin Li 2020-08-20 09:59:23 -07:00 committed by GitHub
parent 15b063beb2
commit 72183c7bb4
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1 changed files with 1 additions and 3 deletions
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src/class/cdc/cdc_device.c
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@ -416,12 +416,10 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
// Though maybe the baudrate is not really important !!! // Though maybe the baudrate is not really important !!!
if ( ep_addr == p_cdc->ep_in ) if ( ep_addr == p_cdc->ep_in )
{ {
uint32_t flushed = tud_cdc_n_write_flush(itf);
// invoke transmit callback to possibly refill tx fifo // invoke transmit callback to possibly refill tx fifo
if ( tud_cdc_tx_complete_cb ) tud_cdc_tx_complete_cb(itf); if ( tud_cdc_tx_complete_cb ) tud_cdc_tx_complete_cb(itf);
if ( 0 == flushed && tu_fifo_empty(&p_cdc->tx_ff) ) if ( 0 == tud_cdc_n_write_flush(itf) )
{ {
// There is no data left, a ZLP should be sent if // There is no data left, a ZLP should be sent if
// xferred_bytes is multiple of EP size and not zero // xferred_bytes is multiple of EP size and not zero