313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
/*
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* File : pipe.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2012-09-30 Bernard first version.
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "audio_pipe.h"
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static void _rt_pipe_resume_writer(struct rt_audio_pipe *pipe)
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{
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if (!rt_list_isempty(&pipe->suspended_write_list))
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{
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rt_thread_t thread;
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RT_ASSERT(pipe->flag & RT_PIPE_FLAG_BLOCK_WR);
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/* get suspended thread */
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thread = rt_list_entry(pipe->suspended_write_list.next,
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struct rt_thread,
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tlist);
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/* resume the write thread */
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rt_thread_resume(thread);
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rt_schedule();
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}
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}
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static rt_size_t rt_pipe_read(rt_device_t dev,
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rt_off_t pos,
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void *buffer,
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rt_size_t size)
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{
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rt_uint32_t level;
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rt_thread_t thread;
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struct rt_audio_pipe *pipe;
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rt_size_t read_nbytes;
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pipe = (struct rt_audio_pipe *)dev;
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RT_ASSERT(pipe != RT_NULL);
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if (!(pipe->flag & RT_PIPE_FLAG_BLOCK_RD))
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{
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level = rt_hw_interrupt_disable();
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read_nbytes = rt_ringbuffer_get(&(pipe->ringbuffer), buffer, size);
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/* if the ringbuffer is empty, there won't be any writer waiting */
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if (read_nbytes)
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_rt_pipe_resume_writer(pipe);
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rt_hw_interrupt_enable(level);
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return read_nbytes;
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}
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thread = rt_thread_self();
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/* current context checking */
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RT_DEBUG_NOT_IN_INTERRUPT;
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do {
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level = rt_hw_interrupt_disable();
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read_nbytes = rt_ringbuffer_get(&(pipe->ringbuffer), buffer, size);
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if (read_nbytes == 0)
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{
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rt_thread_suspend(thread);
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/* waiting on suspended read list */
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rt_list_insert_before(&(pipe->suspended_read_list),
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&(thread->tlist));
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rt_hw_interrupt_enable(level);
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rt_schedule();
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}
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else
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{
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_rt_pipe_resume_writer(pipe);
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rt_hw_interrupt_enable(level);
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break;
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}
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} while (read_nbytes == 0);
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return read_nbytes;
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}
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static void _rt_pipe_resume_reader(struct rt_audio_pipe *pipe)
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{
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if (pipe->parent.rx_indicate)
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pipe->parent.rx_indicate(&pipe->parent,
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rt_ringbuffer_data_len(&pipe->ringbuffer));
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if (!rt_list_isempty(&pipe->suspended_read_list))
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{
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rt_thread_t thread;
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RT_ASSERT(pipe->flag & RT_PIPE_FLAG_BLOCK_RD);
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/* get suspended thread */
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thread = rt_list_entry(pipe->suspended_read_list.next,
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struct rt_thread,
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tlist);
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/* resume the read thread */
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rt_thread_resume(thread);
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rt_schedule();
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}
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}
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static rt_size_t rt_pipe_write(rt_device_t dev,
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rt_off_t pos,
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const void *buffer,
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rt_size_t size)
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{
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rt_uint32_t level;
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rt_thread_t thread;
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struct rt_audio_pipe *pipe;
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rt_size_t write_nbytes;
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pipe = (struct rt_audio_pipe *)dev;
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RT_ASSERT(pipe != RT_NULL);
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if ((pipe->flag & RT_PIPE_FLAG_FORCE_WR) ||
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!(pipe->flag & RT_PIPE_FLAG_BLOCK_WR))
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{
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level = rt_hw_interrupt_disable();
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if (pipe->flag & RT_PIPE_FLAG_FORCE_WR)
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write_nbytes = rt_ringbuffer_put_force(&(pipe->ringbuffer),
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buffer, size);
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else
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write_nbytes = rt_ringbuffer_put(&(pipe->ringbuffer),
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buffer, size);
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_rt_pipe_resume_reader(pipe);
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rt_hw_interrupt_enable(level);
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return write_nbytes;
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}
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thread = rt_thread_self();
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/* current context checking */
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RT_DEBUG_NOT_IN_INTERRUPT;
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do {
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level = rt_hw_interrupt_disable();
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write_nbytes = rt_ringbuffer_put(&(pipe->ringbuffer), buffer, size);
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if (write_nbytes == 0)
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{
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/* pipe full, waiting on suspended write list */
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rt_thread_suspend(thread);
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/* waiting on suspended read list */
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rt_list_insert_before(&(pipe->suspended_write_list),
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&(thread->tlist));
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rt_hw_interrupt_enable(level);
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rt_schedule();
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}
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else
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{
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_rt_pipe_resume_reader(pipe);
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rt_hw_interrupt_enable(level);
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break;
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}
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} while (write_nbytes == 0);
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return write_nbytes;
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}
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static rt_err_t rt_pipe_control(rt_device_t dev, int cmd, void *args)
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{
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struct rt_audio_pipe *pipe;
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pipe = (struct rt_audio_pipe *)dev;
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if (cmd == PIPE_CTRL_GET_SPACE && args)
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*(rt_size_t*)args = rt_ringbuffer_space_len(&pipe->ringbuffer);
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return RT_EOK;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device_ops audio_pipe_ops
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{
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RT_NULL,
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RT_NULL,
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RT_NULL,
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rt_pipe_read,
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rt_pipe_write,
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rt_pipe_control
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};
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#endif
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/**
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* This function will initialize a pipe device and put it under control of
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* resource management.
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*
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* @param pipe the pipe device
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* @param name the name of pipe device
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* @param flag the attribute of the pipe device
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* @param buf the buffer of pipe device
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* @param size the size of pipe device buffer
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*
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* @return the operation status, RT_EOK on successful
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*/
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rt_err_t rt_audio_pipe_init(struct rt_audio_pipe *pipe,
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const char *name,
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enum rt_audio_pipe_flag flag,
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rt_uint8_t *buf,
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rt_size_t size)
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{
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RT_ASSERT(pipe);
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RT_ASSERT(buf);
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/* initialize suspended list */
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rt_list_init(&pipe->suspended_read_list);
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rt_list_init(&pipe->suspended_write_list);
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/* initialize ring buffer */
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rt_ringbuffer_init(&pipe->ringbuffer, buf, size);
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pipe->flag = flag;
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/* create pipe */
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pipe->parent.type = RT_Device_Class_Pipe;
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#ifdef RT_USING_DEVICE_OPS
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pipe->parent.ops = &audio_pipe_ops;
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#else
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pipe->parent.init = RT_NULL;
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pipe->parent.open = RT_NULL;
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pipe->parent.close = RT_NULL;
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pipe->parent.read = rt_pipe_read;
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pipe->parent.write = rt_pipe_write;
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pipe->parent.control = rt_pipe_control;
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#endif
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return rt_device_register(&(pipe->parent), name, RT_DEVICE_FLAG_RDWR);
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}
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/**
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* This function will detach a pipe device from resource management
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*
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* @param pipe the pipe device
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*
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* @return the operation status, RT_EOK on successful
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*/
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rt_err_t rt_audio_pipe_detach(struct rt_audio_pipe *pipe)
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{
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return rt_device_unregister(&pipe->parent);
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}
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#ifdef RT_USING_HEAP
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rt_err_t rt_audio_pipe_create(const char *name, enum rt_audio_pipe_flag flag, rt_size_t size)
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{
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rt_uint8_t *rb_memptr = RT_NULL;
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struct rt_audio_pipe *pipe = RT_NULL;
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/* get aligned size */
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size = RT_ALIGN(size, RT_ALIGN_SIZE);
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pipe = (struct rt_audio_pipe *)rt_calloc(1, sizeof(struct rt_audio_pipe));
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if (pipe == RT_NULL)
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return -RT_ENOMEM;
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/* create ring buffer of pipe */
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rb_memptr = rt_malloc(size);
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if (rb_memptr == RT_NULL)
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{
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rt_free(pipe);
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return -RT_ENOMEM;
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}
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return rt_audio_pipe_init(pipe, name, flag, rb_memptr, size);
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}
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void rt_audio_pipe_destroy(struct rt_audio_pipe *pipe)
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{
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if (pipe == RT_NULL)
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return;
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/* un-register pipe device */
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rt_audio_pipe_detach(pipe);
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/* release memory */
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rt_free(pipe->ringbuffer.buffer_ptr);
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rt_free(pipe);
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return;
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}
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#endif /* RT_USING_HEAP */
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