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105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/****************************************************************************
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*
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* Copyright (C) 2012, 2019 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/**
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* @file drv_adc.h
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*
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* ADC driver interface.
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*
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*/
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#pragma once
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#include <stdint.h>
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#include <sys/ioctl.h>
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#include <systemlib/px4_macros.h>
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#include <uORB/topics/adc_report.h>
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/* Define the PX4 low level format ADC and the maximum
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* number of channels that can be returned by a lowlevel
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* ADC driver. Drivers may return less than PX4_MAX_ADC_CHANNELS
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* but no more than PX4_MAX_ADC_CHANNELS.
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*
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*/
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#define PX4_MAX_ADC_CHANNELS arraySize(adc_report_s::channel_id)
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typedef struct __attribute__((packed)) px4_adc_msg_t {
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uint8_t am_channel; /* The 8-bit ADC Channel */
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int32_t am_data; /* ADC convert result (4 bytes) */
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} px4_adc_msg_t;
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#define BUILTIN_ADC_DEVID 0xffffffff // TODO: integrate into existing ID management
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__BEGIN_DECLS
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/**
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* Initialize ADC hardware
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* @param base_address architecture-specific address to specify the ADC
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* @return 0 on success, <0 error otherwise
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*/
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int px4_arch_adc_init(uint32_t base_address);
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/**
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* Uninitialize ADC hardware
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* @param base_address architecture-specific address to specify the ADC
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*/
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void px4_arch_adc_uninit(uint32_t base_address);
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/**
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* Read a sample from the ADC
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* @param base_address architecture-specific address to specify the ADC
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* @param channel specify the channel
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* @return sample, 0xffffffff on error
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*/
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uint32_t px4_arch_adc_sample(uint32_t base_address, unsigned channel);
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/**
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* Get the ADC positive reference voltage
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* N.B This assume that all ADC channels share the same vref.
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* @return v_ref
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*/
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float px4_arch_adc_reference_v(void);
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/**
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* Get the temperature sensor channel bitmask
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*/
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uint32_t px4_arch_adc_temp_sensor_mask(void);
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/**
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* Get the adc digital number full count
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*/
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uint32_t px4_arch_adc_dn_fullcount(void);
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__END_DECLS
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