diff --git a/nuttx-configs/px4fmu-v1/nsh/defconfig b/nuttx-configs/px4fmu-v1/nsh/defconfig index dc884413a0..49ccfd41bc 100644 --- a/nuttx-configs/px4fmu-v1/nsh/defconfig +++ b/nuttx-configs/px4fmu-v1/nsh/defconfig @@ -264,7 +264,7 @@ CONFIG_STM32_USART=y # U[S]ART Configuration # # CONFIG_USART1_RS485 is not set -CONFIG_USART1_RXDMA=y +# CONFIG_USART1_RXDMA is not set # CONFIG_USART2_RS485 is not set CONFIG_USART2_RXDMA=y # CONFIG_USART3_RXDMA is not set @@ -559,8 +559,8 @@ CONFIG_CDCACM_EPBULKIN_FSSIZE=64 CONFIG_CDCACM_EPBULKIN_HSSIZE=512 CONFIG_CDCACM_NWRREQS=4 CONFIG_CDCACM_NRDREQS=4 -CONFIG_CDCACM_RXBUFSIZE=512 -CONFIG_CDCACM_TXBUFSIZE=512 +CONFIG_CDCACM_RXBUFSIZE=256 +CONFIG_CDCACM_TXBUFSIZE=256 CONFIG_CDCACM_VENDORID=0x26ac CONFIG_CDCACM_PRODUCTID=0x0010 CONFIG_CDCACM_VENDORSTR="3D Robotics" diff --git a/src/drivers/device/ringbuffer.h b/src/drivers/device/ringbuffer.h new file mode 100644 index 0000000000..37686fdbe3 --- /dev/null +++ b/src/drivers/device/ringbuffer.h @@ -0,0 +1,192 @@ +/**************************************************************************** + * + * Copyright (C) 2013 PX4 Development Team. All rights reserved. + * Author: Lorenz Meier + * + * 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 PX4 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 AND CONTRIBUTORS + * "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 OWNER OR CONTRIBUTORS 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. + * + ****************************************************************************/ + +/** + * @file ringbuffer.h + * + * A simple ringbuffer template. + */ + +#pragma once + +template +class RingBuffer { +public: + RingBuffer(unsigned size); + virtual ~RingBuffer(); + + /** + * Put an item into the buffer. + * + * @param val Item to put + * @return true if the item was put, false if the buffer is full + */ + bool put(T &val); + + /** + * Put an item into the buffer. + * + * @param val Item to put + * @return true if the item was put, false if the buffer is full + */ + bool put(const T &val); + + /** + * Get an item from the buffer. + * + * @param val Item that was gotten + * @return true if an item was got, false if the buffer was empty. + */ + bool get(T &val); + + /** + * Get an item from the buffer (scalars only). + * + * @return The value that was fetched, or zero if the buffer was + * empty. + */ + T get(void); + + /* + * Get the number of slots free in the buffer. + * + * @return The number of items that can be put into the buffer before + * it becomes full. + */ + unsigned space(void); + + /* + * Get the number of items in the buffer. + * + * @return The number of items that can be got from the buffer before + * it becomes empty. + */ + unsigned count(void); + + /* + * Returns true if the buffer is empty. + */ + bool empty() { return _tail == _head; } + + /* + * Returns true if the buffer is full. + */ + bool full() { return _next(_head) == _tail; } + +private: + T *const _buf; + const unsigned _size; + volatile unsigned _head; /**< insertion point */ + volatile unsigned _tail; /**< removal point */ + + unsigned _next(unsigned index); +}; + +template +RingBuffer::RingBuffer(unsigned size) : + _buf(new T[size + 1]), + _size(size), + _head(size), + _tail(size) +{} + +template +RingBuffer::~RingBuffer() +{ + if (_buf != nullptr) + delete[] _buf; +} + +template +bool RingBuffer::put(T &val) +{ + unsigned next = _next(_head); + if (next != _tail) { + _buf[_head] = val; + _head = next; + return true; + } else { + return false; + } +} + +template +bool RingBuffer::put(const T &val) +{ + unsigned next = _next(_head); + if (next != _tail) { + _buf[_head] = val; + _head = next; + return true; + } else { + return false; + } +} + +template +bool RingBuffer::get(T &val) +{ + if (_tail != _head) { + val = _buf[_tail]; + _tail = _next(_tail); + return true; + } else { + return false; + } +} + +template +T RingBuffer::get(void) +{ + T val; + return get(val) ? val : 0; +} + +template +unsigned RingBuffer::space(void) +{ + return (_tail >= _head) ? (_size - (_tail - _head)) : (_head - _tail - 1); +} + +template +unsigned RingBuffer::count(void) +{ + return _size - space(); +} + +template +unsigned RingBuffer::_next(unsigned index) +{ + return (0 == index) ? _size : (index - 1); +}