/** * \file * <!-- * This file is part of BeRTOS. * * Bertos is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * As a special exception, you may use this file as part of a free software * library without restriction. Specifically, if other files instantiate * templates or use macros or inline functions from this file, or you compile * this file and link it with other files to produce an executable, this * file does not by itself cause the resulting executable to be covered by * the GNU General Public License. This exception does not however * invalidate any other reasons why the executable file might be covered by * the GNU General Public License. * * Copyright 2011 Develer S.r.l. (http://www.develer.com/) * * --> * * \defgroup dac Generic DAC driver * \ingroup drivers * \{ * \brief Digital to Analog Converter driver (DAC). * * <b>Configuration file</b>: cfg_dac.h * * \author Daniele Basile <asterix@develer.com> * * $WIZ$ module_name = "dac" * $WIZ$ module_configuration = "bertos/cfg/cfg_dac.h" * $WIZ$ module_supports = "sam3x" */ #ifndef DRV_DAC_H #define DRV_DAC_H #include <cfg/compiler.h> #include <cfg/debug.h> #include <cfg/macros.h> #include <cpu/attr.h> #include CPU_HEADER(dac) struct DacContext; struct Dac; typedef int (*DacWriteFunc_t) (struct Dac *dac, unsigned channel, uint16_t sample); typedef void (*SetChannelMaskFunc_t) (struct Dac *dac, uint32_t mask); typedef void (*SetSamplingRate_t) (struct Dac *dac, uint32_t rate); typedef void (*DmaConversionBufFunc_t) (struct Dac *dac, void *buf, size_t len); typedef bool (*DmaConversionIsFinished_t) (struct Dac *dac); typedef void (*DmaStartStreamingFunc_t) (struct Dac *dac, void *buf, size_t len, size_t slice_len); typedef void (*DmaStopFunc_t) (struct Dac *dac); typedef void (*DmaCallbackFunc_t) (struct Dac *dac, void *_buf, size_t len); typedef struct DacContext { DacWriteFunc_t write; SetChannelMaskFunc_t setCh; SetSamplingRate_t setSampleRate; DmaConversionBufFunc_t conversion; DmaConversionIsFinished_t isFinished; DmaStartStreamingFunc_t start; DmaStopFunc_t stop; DmaCallbackFunc_t callback; size_t slice_len; DB(id_t _type); } DacContext; typedef struct Dac { DacContext ctx; struct DacHardware *hw; } Dac; INLINE int dac_write(Dac *dac, unsigned channel, uint16_t sample) { ASSERT(dac->ctx.write); return dac->ctx.write(dac, channel, sample); } INLINE void dac_setChannelMask(struct Dac *dac, uint32_t mask) { ASSERT(dac->ctx.setCh); dac->ctx.setCh(dac, mask); } INLINE void dac_setSamplingRate(Dac *dac, uint32_t rate) { ASSERT(dac->ctx.setSampleRate); dac->ctx.setSampleRate(dac, rate); } /* * Convert \param len samples stored into \param buf. */ INLINE void dac_dmaConversionBuffer(Dac *dac, void *buf, size_t len) { ASSERT(dac->ctx.conversion); dac->ctx.conversion(dac, buf, len); } /* * Check if a dma transfer is finished. * * Useful for kernel-less applications. */ INLINE bool dac_dmaIsFinished(Dac *dac) { ASSERT(dac->ctx.isFinished); return dac->ctx.isFinished(dac); } /* * \param slicelen Must be a divisor of len, ie. len % slicelen == 0. */ INLINE void dac_dmaStartStreaming(Dac *dac, void *buf, size_t len, size_t slice_len, DmaCallbackFunc_t callback) { ASSERT(dac->ctx.start); ASSERT(len % slice_len == 0); ASSERT(callback); dac->ctx.callback = callback; dac->ctx.slice_len = slice_len; dac->ctx.start(dac, buf, len, slice_len); } INLINE void dac_dmaStop(Dac *dac) { ASSERT(dac->ctx.stop); dac->ctx.stop(dac); } #define dac_bits() DAC_BITS void dac_init(Dac *dac); /** \} */ //defgroup dac #endif /* DRV_DAC_H */