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fix(driver): Add docs and driver fix for the case where a full EP does not cause the host to pickup the data

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This commit is contained in:
Jeroen Domburg
2023-11-24 17:37:22 +08:00
committed by Cao Sen Miao
parent 46d402d22e
commit 28e2ab09ea
7 changed files with 55 additions and 12 deletions
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12
components/hal/esp32c6/include/hal/usb_serial_jtag_ll.h
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -161,8 +161,14 @@ static inline int usb_serial_jtag_ll_txfifo_writable(void)
* @brief Flushes the TX buffer, that is, make it available for the
* host to pick up.
*
* @note When fifo is full (with 64 byte), HW will flush the buffer automatically.
* It won't be executed if there is nothing in the fifo.
* @note When fifo is full (with 64 byte), HW will flush the buffer automatically,
* if this function is called directly after, this effectively turns into a
* no-op. Because a 64-byte packet will be interpreted as a not-complete USB
* transaction, you need to transfer either more data or a zero-length packet
* for the data to actually end up at the program listening to the CDC-ACM
* serial port. To send a zero-length packet, call
* usb_serial_jtag_ll_txfifo_flush() again when
* usb_serial_jtag_ll_txfifo_writable() returns true.
*
* @return na
*/