157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2011 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \defgroup dac Generic DAC driver
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* \ingroup drivers
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* \{
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* \brief Digital to Analog Converter driver (DAC).
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*
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* <b>Configuration file</b>: cfg_dac.h
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*
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* \author Daniele Basile <asterix@develer.com>
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*
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* $WIZ$ module_name = "dac"
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* $WIZ$ module_configuration = "bertos/cfg/cfg_dac.h"
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* $WIZ$ module_supports = "sam3x"
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*/
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#ifndef DRV_DAC_H
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#define DRV_DAC_H
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#include <cfg/compiler.h>
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#include <cfg/debug.h>
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#include <cfg/macros.h>
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#include <cpu/attr.h>
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#include CPU_HEADER(dac)
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struct DacContext;
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struct Dac;
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typedef int (*DacWriteFunc_t) (struct Dac *dac, unsigned channel, uint16_t sample);
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typedef void (*SetChannelMaskFunc_t) (struct Dac *dac, uint32_t mask);
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typedef void (*SetSamplingRate_t) (struct Dac *dac, uint32_t rate);
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typedef void (*DmaConversionBufFunc_t) (struct Dac *dac, void *buf, size_t len);
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typedef bool (*DmaConversionIsFinished_t) (struct Dac *dac);
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typedef void (*DmaStartStreamingFunc_t) (struct Dac *dac, void *buf, size_t len, size_t slice_len);
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typedef void (*DmaStopFunc_t) (struct Dac *dac);
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typedef void (*DmaCallbackFunc_t) (struct Dac *dac, void *_buf, size_t len);
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typedef struct DacContext
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{
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DacWriteFunc_t write;
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SetChannelMaskFunc_t setCh;
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SetSamplingRate_t setSampleRate;
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DmaConversionBufFunc_t conversion;
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DmaConversionIsFinished_t isFinished;
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DmaStartStreamingFunc_t start;
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DmaStopFunc_t stop;
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DmaCallbackFunc_t callback;
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size_t slice_len;
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DB(id_t _type);
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} DacContext;
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typedef struct Dac
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{
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DacContext ctx;
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struct DacHardware *hw;
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} Dac;
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INLINE int dac_write(Dac *dac, unsigned channel, uint16_t sample)
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{
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ASSERT(dac->ctx.write);
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return dac->ctx.write(dac, channel, sample);
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}
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INLINE void dac_setChannelMask(struct Dac *dac, uint32_t mask)
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{
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ASSERT(dac->ctx.setCh);
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dac->ctx.setCh(dac, mask);
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}
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INLINE void dac_setSamplingRate(Dac *dac, uint32_t rate)
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{
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ASSERT(dac->ctx.setSampleRate);
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dac->ctx.setSampleRate(dac, rate);
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}
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/*
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* Convert \param len samples stored into \param buf.
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*/
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INLINE void dac_dmaConversionBuffer(Dac *dac, void *buf, size_t len)
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{
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ASSERT(dac->ctx.conversion);
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dac->ctx.conversion(dac, buf, len);
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}
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/*
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* Check if a dma transfer is finished.
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*
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* Useful for kernel-less applications.
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*/
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INLINE bool dac_dmaIsFinished(Dac *dac)
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{
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ASSERT(dac->ctx.isFinished);
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return dac->ctx.isFinished(dac);
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}
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/*
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* \param slicelen Must be a divisor of len, ie. len % slicelen == 0.
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*/
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INLINE void dac_dmaStartStreaming(Dac *dac, void *buf, size_t len, size_t slice_len, DmaCallbackFunc_t callback)
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{
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ASSERT(dac->ctx.start);
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ASSERT(len % slice_len == 0);
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ASSERT(callback);
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dac->ctx.callback = callback;
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dac->ctx.slice_len = slice_len;
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dac->ctx.start(dac, buf, len, slice_len);
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}
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INLINE void dac_dmaStop(Dac *dac)
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{
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ASSERT(dac->ctx.stop);
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dac->ctx.stop(dac);
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}
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#define dac_bits() DAC_BITS
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void dac_init(Dac *dac);
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/** \} */ //defgroup dac
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#endif /* DRV_DAC_H */
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