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/**
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* \file spidevice.h
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*
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* \brief Wrapper class to communicate to device via spidev
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*
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* Websites:
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* Critical Link - http://www.criticallink.com
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*
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* \copyright Critical Link LLC 2015
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*/
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#ifndef SPIDEVICE_H_
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#define SPIDEVICE_H_
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/types.h>
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#include <linux/spi/spidev.h>
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#include <string>
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struct tsSPIConfiguration
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{
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int mnMode; // SPI transfer mode including polarity and clock phase.
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unsigned char mnLsbType; // LSB first/last.
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unsigned char mnBits; // The number of bits per word.
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long mnSpeed; // The speed in Hz.
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};
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class tcSPIDevice
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{
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public:
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/**
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* Creates a spi device on the given bus and chip select.
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*/
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tcSPIDevice(std::string asDevice);
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tcSPIDevice(const char* asDevice);
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virtual ~tcSPIDevice();
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/**
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* Open the device if it is not already open.
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*/
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void openDevice();
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/**
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* Close the SPI device.
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*/
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void closeDevice();
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bool isOpen();
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tsSPIConfiguration getConfiguration();
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bool setConfiguration(struct tsSPIConfiguration &arConfiguration);
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/**
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* Write the data out.
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*
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* @param apTxData - the data to send.
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* @param anLen - the number of bytes in apTxData
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*/
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void write(char *apTxData, long anLen);
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/**
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* Read data.
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*
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* @param apRxData - the location to store data to
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* @param anLen - the number of bytes in apRxData
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*/
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void read(char *apRxData, long anLen);
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/**
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* Perform a full duplex operation; Tx/Rx of length anLen.
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*
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* Note: The arrays must be of the same length.
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*
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* @param apRxData - the location to store received data in.
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* @param apTxData - the data to send
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* @param anLen the length of the arrays.
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*/
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void duplex(char *apTxData, char *apRxData, long anLen);
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private:
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std::string msDevice;
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int mnFileDescriptor;
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};
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#endif /* SPIDEVICE_H_ */
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