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Remove txbuf in favor of fifo.

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Fifo incurs a second copy into a USB buffer but this ensures the
correct USB buffer alignment. Some LPC chips require 64 byte
alignment that txbuf couldn't do.
This commit is contained in:
Scott Shawcroft
2019-01-08 14:10:40 -08:00
parent 7016d7fa54
commit 52abbec7c5
7 changed files with 29 additions and 502 deletions
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159
src/common/tusb_txbuf.c
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@@ -1,159 +0,0 @@
/**************************************************************************/
/*!
@file tusb_txbuf.c
@author Scott Shawcroft
@section LICENSE
Software License Agreement (BSD License)
Copyright (c) 2018, Scott Shawcroft
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holders nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This file is part of the tinyusb stack.
*/
/**************************************************************************/
#include <stdio.h>
#include <string.h>
#include "tusb_txbuf.h"
bool tu_txbuf_config(tu_txbuf_t *txbuf, uint8_t* buffer, uint16_t buffer_length, edpt_xfer xfer)
{
txbuf->buffer = (uint8_t*) buffer;
txbuf->buf_len = buffer_length;
txbuf->first_free = 0;
txbuf->pending_count = 0;
txbuf->transmitting_count = 0;
txbuf->xfer = xfer;
txbuf->padding = 0;
return true;
}
uint16_t maybe_transmit(tu_txbuf_t* buf) {
if (buf->transmitting_count > 0 || buf->pending_count == 0) {
return 0;
}
buf->transmitting_count = buf->pending_count;
uint16_t transmit_start_index;
uint8_t over_aligned = 0;
// The pending zone wraps back to the end so we must do two transfers.
if (buf->pending_count > buf->first_free) {
buf->transmitting_count -= buf->first_free;
transmit_start_index = buf->buf_len - buf->transmitting_count;
} else {
transmit_start_index = buf->first_free - buf->transmitting_count;
// We are transmitting up to first free so ensure it's word aligned for the next transmit.
over_aligned = buf->first_free % sizeof(uint32_t);
buf->padding = sizeof(uint32_t) - over_aligned;
if (over_aligned != 0) {
buf->first_free = (buf->first_free + buf->padding) % buf->buf_len;
}
}
buf->pending_count -= buf->transmitting_count;
uint8_t* tx_start = buf->buffer + transmit_start_index;
if (!buf->xfer(0, buf->ep_addr, tx_start, buf->transmitting_count)) {
return 0;
}
return buf->transmitting_count;
}
uint32_t tu_txbuf_transmit_done_cb(tu_txbuf_t* buf, uint32_t bufsize) {
buf->transmitting_count -= bufsize;
return maybe_transmit(buf);
}
/******************************************************************************/
/*!
@brief This function will write n elements into the array index specified by
the write pointer and increment the write index. If the write index
exceeds the max buffer size, then it will roll over to zero.
@param[in] f
Pointer to the FIFO buffer to manipulate
@param[in] p_data
The pointer to data to add to the FIFO
@param[in] count
Number of element
@return Number of written elements
*/
/******************************************************************************/
uint16_t tu_txbuf_write_n(tu_txbuf_t* txbuf, uint8_t const* buffer, uint32_t bufsize) {
uint32_t len;
int32_t last_free = txbuf->first_free - txbuf->pending_count - txbuf->transmitting_count - txbuf->padding;
if (last_free < 0) {
last_free += txbuf->buf_len;
len = last_free - txbuf->first_free;
} else {
len = txbuf->buf_len - txbuf->first_free;
}
if (bufsize < len) {
len = bufsize;
}
memcpy(txbuf->buffer + txbuf->first_free, buffer, len);
txbuf->first_free = (txbuf->first_free + len) % txbuf->buf_len;
txbuf->pending_count += len;
// Try to transmit now while we wrap the rest.
maybe_transmit(txbuf);
uint32_t remaining_bytes = bufsize - len;
if (remaining_bytes > 0 && last_free != txbuf->first_free) {
uint32_t second_len = remaining_bytes;
if (second_len > (uint32_t) last_free + 1) {
second_len = last_free + 1;
}
memcpy(txbuf->buffer, buffer + len, second_len);
txbuf->first_free = (txbuf->first_free + second_len) % txbuf->buf_len;
txbuf->pending_count += second_len;
len += second_len;
}
return len;
}
void tu_txbuf_set_ep_addr(tu_txbuf_t* txbuf, uint8_t ep_addr) {
txbuf->ep_addr = ep_addr;
}
/******************************************************************************/
/*!
@brief Clear the txbuf including any currently transmitting data.
@param[in] t
Pointer to the txbuf to manipulate
*/
/******************************************************************************/
bool tu_txbuf_clear(tu_txbuf_t *txbuf)
{
txbuf->first_free = 0;
txbuf->pending_count = 0;
txbuf->transmitting_count = 0;
return true;
}

83
src/common/tusb_txbuf.h
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@@ -1,83 +0,0 @@
/**************************************************************************/
/*!
@file tusb_txbuf.h
@author Scott Shawcroft
@section LICENSE
Software License Agreement (BSD License)
Copyright (c) 2018, Scott Shawcroft
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holders nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This file is part of the tinyusb stack.
*/
/**************************************************************************/
/** \ingroup Group_Common
* \defgroup group_txbuf txbuf
* @{ */
#ifndef _TUSB_TXBUF_H_
#define _TUSB_TXBUF_H_
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef bool (*edpt_xfer) (uint8_t rhport, uint8_t ep_addr, uint8_t* buffer, uint16_t total_bytes);
/** \struct tu_txbuf_t
* \brief Circular transmit buffer that manages USB transfer memory. It is not threadsafe and is
* only meant for use in the main task.
*/
typedef struct
{
uint8_t* buffer ; ///< buffer pointer
uint16_t buf_len;
uint16_t first_free;
uint16_t pending_count;
uint16_t transmitting_count;
uint16_t padding;
uint8_t ep_addr;
edpt_xfer xfer;
} tu_txbuf_t;
bool tu_txbuf_clear(tu_txbuf_t *f);
bool tu_txbuf_config(tu_txbuf_t *f, uint8_t* buffer, uint16_t depth, edpt_xfer xfer);
uint16_t tu_txbuf_write_n (tu_txbuf_t* txbuf, uint8_t const * buffer, uint32_t length);
void tu_txbuf_set_ep_addr(tu_txbuf_t* txbuf, uint8_t ep_addr);
uint32_t tu_txbuf_transmit_done_cb(tu_txbuf_t* buf, uint32_t bufsize);
#ifdef __cplusplus
}
#endif
#endif /* _TUSB_TXBUF_H_ */