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Update USBCDC.cpp to support ZLP

pull/15473/head
Chris Liang 2023-12-01 20:22:47 +08:00 committed by GitHub
parent 794ee9704f
commit 1cccc7e14d
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1 changed files with 9 additions and 0 deletions
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9
drivers/usb/source/USBCDC.cpp
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@ -186,6 +186,7 @@ void USBCDC::_init()
_rx_in_progress = false;
_rx_buf = _rx_buffer;
_rx_size = 0;
_trans_zlp = false;
}
void USBCDC::callback_reset()
@ -387,6 +388,9 @@ void USBCDC::send_nb(uint8_t *buffer, uint32_t size, uint32_t *actual, bool now)
}
_tx_size += write_size;
*actual = write_size;
if((CDC_MAX_PACKET_SIZE == size) && (CDC_MAX_PACKET_SIZE == write_size)) {
_trans_zlp = true;
}
if (now) {
_send_isr_start();
}
@ -403,6 +407,11 @@ void USBCDC::_send_isr_start()
if (USBDevice::write_start(_bulk_in, _tx_buffer, _tx_size)) {
_tx_in_progress = true;
}
} else if(!_tx_in_progress && _trans_zlp) {
if (USBDevice::write_start(_bulk_in, _tx_buffer, 0)) {
_tx_in_progress = true;
_trans_zlp = false;
}
}
}