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Add tx callback to cdc device

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Useful for continuous transmission of data, which is difficult currently
because there is no notification of tx completion.
This commit is contained in:
Gavin Li 2020-06-18 01:13:44 -07:00
parent 2b27eed01a
commit 8fe887198b
2 changed files with 6 additions and 0 deletions
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3
src/class/cdc/cdc_device.c
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@ -416,6 +416,9 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
// Though maybe the baudrate is not really important !!!
if ( ep_addr == p_cdc->ep_in )
{
// 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);
if ( 0 == tud_cdc_n_write_flush(itf) )
{
// There is no data left, a ZLP should be sent if

3
src/class/cdc/cdc_device.h
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@ -128,6 +128,9 @@ TU_ATTR_WEAK void tud_cdc_rx_cb(uint8_t itf);
// Invoked when received `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
TU_ATTR_WEAK void tud_cdc_tx_cb(uint8_t itf);
// 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);