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px4dev
4b4f33e6a4
Make the Device destructor public and virtual, so that arbitrary devices can be deleted. Likewise for classes that derive from it. Make Device::init public so that arbitrary devices can be initialised after being returned by factories.
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/****************************************************************************
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*
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* Copyright (C) 2012 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 spi.h
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*
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* Base class for devices connected via SPI.
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*/
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#ifndef _DEVICE_SPI_H
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#define _DEVICE_SPI_H
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#include "device.h"
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#include <nuttx/spi.h>
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namespace device __EXPORT
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{
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/**
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* Abstract class for character device on SPI
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*/
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class __EXPORT SPI : public CDev
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{
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protected:
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/**
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* Constructor
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*
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* @param name Driver name
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* @param devname Device node name
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* @param bus SPI bus on which the device lives
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* @param device Device handle (used by SPI_SELECT)
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* @param mode SPI clock/data mode
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* @param frequency SPI clock frequency
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* @param irq Interrupt assigned to the device (or zero if none)
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*/
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SPI(const char *name,
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const char *devname,
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int bus,
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enum spi_dev_e device,
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enum spi_mode_e mode,
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uint32_t frequency,
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int irq = 0);
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virtual ~SPI();
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virtual int init();
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/**
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* Check for the presence of the device on the bus.
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*/
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virtual int probe();
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/**
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* Perform a SPI transfer.
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*
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* If called from interrupt context, this interface does not lock
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* the bus and may interfere with non-interrupt-context callers.
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*
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* Clients in a mixed interrupt/non-interrupt configuration must
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* ensure appropriate interlocking.
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*
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* At least one of send or recv must be non-null.
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*
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* @param send Bytes to send to the device, or nullptr if
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* no data is to be sent.
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* @param recv Buffer for receiving bytes from the device,
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* or nullptr if no bytes are to be received.
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* @param len Number of bytes to transfer.
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* @return OK if the exchange was successful, -errno
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* otherwise.
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*/
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int transfer(uint8_t *send, uint8_t *recv, unsigned len);
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private:
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int _bus;
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enum spi_dev_e _device;
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enum spi_mode_e _mode;
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uint32_t _frequency;
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struct spi_dev_s *_dev;
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};
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} // namespace device
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#endif /* _DEVICE_SPI_H */
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