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#ifndef CYGONCE_ADC_H #define CYGONCE_ADC_H /*========================================================================== // // adc.h // // Generic ADC driver layer header // //========================================================================== // ####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 2008 Free Software Foundation, Inc. // // eCos 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 or (at your option) any later // version. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // As a special exception, if other files instantiate templates or use // macros or inline functions from this file, or you compile this file // and link it with other works to produce a work based on this file, // this file does not by itself cause the resulting work to be covered by // the GNU General Public License. However the source code for this file // must still be made available in accordance with section (3) of the GNU // General Public License v2. // // This exception does not invalidate any other reasons why a work based // on this file might be covered by the GNU General Public License. // ------------------------------------------- // ####ECOSGPLCOPYRIGHTEND#### //========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): nickg // Date: 2008-03-31 // Description: Implements generic layer of ADC drivers. // //####DESCRIPTIONEND#### // //========================================================================*/ #include <pkgconf/system.h> #include <pkgconf/io_adc.h> #include <cyg/infra/cyg_type.h> #include <cyg/io/io.h> #include <cyg/io/devtab.h> #include <cyg/io/config_keys.h> #include <cyg/hal/drv_api.h> #ifdef CYGPKG_IO_ADC_SELECT_SUPPORT #include <cyg/fileio/fileio.h> #endif //========================================================================== // Configuration information structure typedef struct { cyg_uint32 rate; // Sample rate } cyg_adc_info_t; //========================================================================== // Sample size type. // // Define sample size type depending on hardware capability. #if CYGNUM_IO_ADC_SAMPLE_SIZE > 16 typedef cyg_int32 cyg_adc_sample_t; #elif CYGNUM_IO_ADC_SAMPLE_SIZE > 8 typedef cyg_int16 cyg_adc_sample_t; #else typedef cyg_int8 cyg_adc_sample_t; #endif //========================================================================== // Forward type definitions. typedef struct cyg_adc_device cyg_adc_device; typedef struct cyg_adc_channel cyg_adc_channel; typedef struct cyg_adc_functions cyg_adc_functions; //========================================================================== // Callbacks from hardware drivers to generic driver. __externC void cyg_adc_device_init( cyg_adc_device *device ); __externC void cyg_adc_channel_init(cyg_adc_channel *chan); __externC cyg_uint32 cyg_adc_receive_sample(cyg_adc_channel *chan, cyg_adc_sample_t sample); __externC void cyg_adc_wakeup(cyg_adc_channel *chan ); //========================================================================== // Device table functions __externC cyg_devio_table_t cyg_io_adc_devio; //========================================================================== // ADC device // // A single device may support several channels which share interrupt // vectors and sample rate settings. struct cyg_adc_device { cyg_adc_functions *funs; // Hardware device functions void *dev_priv; // Hardware device private data cyg_adc_info_t config; // Current configuration cyg_bool init; // Initialized ? cyg_drv_mutex_t lock; // Device lock }; #define CYG_ADC_DEVICE(__name, __funs, __dev_priv, __rate ) \ cyg_adc_device __name = \ { \ .funs = __funs, \ .dev_priv = __dev_priv, \ .config.rate = __rate, \ .init = false \ }; //========================================================================== // ADC channel // // Each device may support several channels, each providing a separate // stream of samples. struct cyg_adc_channel { int channel; // Channel number cyg_adc_sample_t *buf; // Sample data buffer int len; // Buffer length in samples volatile int put; // Sample insert index volatile int get; // Sample extract index cyg_adc_device *device; // Controlling device cyg_bool init; // Initialized ? cyg_drv_cond_t wait; // Readers wait here for data cyg_bool waiting; // True if any threads waiting cyg_bool wakeup; // True if wakeup needed cyg_bool enabled; // Channel enabled? cyg_bool blocking; // Blocking IO int overflow; // Overflow counter #ifdef CYGPKG_IO_ADC_SELECT_SUPPORT struct CYG_SELINFO_TAG selinfo; // Select info #endif }; #define CYG_ADC_CHANNEL( __name, __channel, __bufsize, __device ) \ static cyg_adc_sample_t __name##_buf[__bufsize]; \ cyg_adc_channel __name = \ { \ .channel = __channel, \ .buf = __name##_buf, \ .len = __bufsize, \ .put = 0, \ .get = 0, \ .device = __device, \ .init = false \ }; //========================================================================== // Device functions // // These are the functions exported by the hardware device to the // generic layer. struct cyg_adc_functions { void (*enable)( cyg_adc_channel *chan ); void (*disable)( cyg_adc_channel *chan ); void (*set_rate)( cyg_adc_channel *chan, cyg_uint32 rate ); }; #define CYG_ADC_FUNCTIONS( __name, __enable, __disable, __set_rate ) \ cyg_adc_functions __name = \ { \ .enable = __enable, \ .disable = __disable, \ .set_rate = __set_rate \ }; //========================================================================== #endif // CYGONCE_ADC_H
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