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Smarter CDC TX refill logic

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This commit is contained in:
Gavin Li 2020-08-20 02:20:01 -07:00
parent 7ae47a9397
commit 15b063beb2
2 changed files with 7 additions and 5 deletions
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10
src/class/cdc/cdc_device.c
View File

@ -416,7 +416,12 @@ 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 )
{ {
if ( 0 == tud_cdc_n_write_flush(itf) ) uint32_t flushed = tud_cdc_n_write_flush(itf);
// invoke transmit callback to possibly refill tx fifo
if ( tud_cdc_tx_complete_cb ) tud_cdc_tx_complete_cb(itf);
if ( 0 == flushed && tu_fifo_empty(&p_cdc->tx_ff) )
{ {
// 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
@ -425,9 +430,6 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
usbd_edpt_xfer(TUD_OPT_RHPORT, p_cdc->ep_in, NULL, 0); usbd_edpt_xfer(TUD_OPT_RHPORT, p_cdc->ep_in, NULL, 0);
} }
} }
// invoke transmit callback to possibly refill tx fifo
if ( tud_cdc_tx_cb && !tu_fifo_full(&p_cdc->tx_ff) ) tud_cdc_tx_cb(itf);
} }
// nothing to do with notif endpoint for now // nothing to do with notif endpoint for now

2
src/class/cdc/cdc_device.h
View File

@ -129,7 +129,7 @@ TU_ATTR_WEAK void tud_cdc_rx_cb(uint8_t itf);
TU_ATTR_WEAK void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char); TU_ATTR_WEAK void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char);
// Invoked when space becomes available in TX buffer // Invoked when space becomes available in TX buffer
TU_ATTR_WEAK void tud_cdc_tx_cb(uint8_t itf); TU_ATTR_WEAK void tud_cdc_tx_complete_cb(uint8_t itf);
// Invoked when line state DTR & RTS are changed via SET_CONTROL_LINE_STATE // Invoked when line state DTR & RTS are changed via SET_CONTROL_LINE_STATE
TU_ATTR_WEAK void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts); TU_ATTR_WEAK void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts);