95 lines
4.5 KiB
C++
95 lines
4.5 KiB
C++
// RHSPIDriver.h
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// Author: Mike McCauley (mikem@airspayce.com)
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// Copyright (C) 2014 Mike McCauley
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// $Id: RHSPIDriver.h,v 1.10 2015/12/16 04:55:33 mikem Exp $
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#ifndef RHSPIDriver_h
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#define RHSPIDriver_h
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#include <RHGenericDriver.h>
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#include <RHHardwareSPI.h>
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// This is the bit in the SPI address that marks it as a write
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#define RH_SPI_WRITE_MASK 0x80
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class RHGenericSPI;
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/////////////////////////////////////////////////////////////////////
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/// \class RHSPIDriver RHSPIDriver.h <RHSPIDriver.h>
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/// \brief Base class for a RadioHead drivers that use the SPI bus
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/// to communicate with its transport hardware.
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///
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/// This class can be subclassed by Drivers that require to use the SPI bus.
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/// It can be configured to use either the RHHardwareSPI class (if there is one available on the platform)
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/// of the bitbanged RHSoftwareSPI class. The default behaviour is to use a pre-instantiated built-in RHHardwareSPI
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/// interface.
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///
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/// SPI bus access is protected by ATOMIC_BLOCK_START and ATOMIC_BLOCK_END, which will ensure interrupts
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/// are disabled during access.
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///
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/// The read and write routines implement commonly used SPI conventions: specifically that the MSB
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/// of the first byte transmitted indicates that it is a write and the remaining bits indicate the rehgister to access)
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/// This can be overriden
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/// in subclasses if necessaryor an alternative class, RHNRFSPIDriver can be used to access devices like
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/// Nordic NRF series radios, which have different requirements.
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///
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/// Application developers are not expected to instantiate this class directly:
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/// it is for the use of Driver developers.
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class RHSPIDriver : public RHGenericDriver
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{
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public:
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/// Constructor
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/// \param[in] slaveSelectPin The controler pin to use to select the desired SPI device. This pin will be driven LOW
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/// during SPI communications with the SPI device that uis iused by this Driver.
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/// \param[in] spi Reference to the SPI interface to use. The default is to use a default built-in Hardware interface.
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RHSPIDriver(uint8_t slaveSelectPin = SS, RHGenericSPI& spi = hardware_spi);
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/// Initialise the Driver transport hardware and software.
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/// Make sure the Driver is properly configured before calling init().
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/// \return true if initialisation succeeded.
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bool init();
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/// Reads a single register from the SPI device
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/// \param[in] reg Register number
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/// \return The value of the register
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uint8_t spiRead(uint8_t reg);
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/// Writes a single byte to the SPI device
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/// \param[in] reg Register number
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/// \param[in] val The value to write
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/// \return Some devices return a status byte during the first data transfer. This byte is returned.
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/// it may or may not be meaningfule depending on the the type of device being accessed.
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uint8_t spiWrite(uint8_t reg, uint8_t val);
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/// Reads a number of consecutive registers from the SPI device using burst read mode
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/// \param[in] reg Register number of the first register
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/// \param[in] dest Array to write the register values to. Must be at least len bytes
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/// \param[in] len Number of bytes to read
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/// \return Some devices return a status byte during the first data transfer. This byte is returned.
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/// it may or may not be meaningfule depending on the the type of device being accessed.
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uint8_t spiBurstRead(uint8_t reg, uint8_t* dest, uint8_t len);
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/// Write a number of consecutive registers using burst write mode
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/// \param[in] reg Register number of the first register
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/// \param[in] src Array of new register values to write. Must be at least len bytes
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/// \param[in] len Number of bytes to write
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/// \return Some devices return a status byte during the first data transfer. This byte is returned.
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/// it may or may not be meaningfule depending on the the type of device being accessed.
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uint8_t spiBurstWrite(uint8_t reg, const uint8_t* src, uint8_t len);
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/// Set or change the pin to be used for SPI slave select.
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/// This can be called at any time to change the
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/// pin that will be used for slave select in subsquent SPI operations.
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/// \param[in] slaveSelectPin The pin to use
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void setSlaveSelectPin(uint8_t slaveSelectPin);
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protected:
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/// Reference to the RHGenericSPI instance to use to transfer data with teh SPI device
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RHGenericSPI& _spi;
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/// The pin number of the Slave Select pin that is used to select the desired device.
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uint8_t _slaveSelectPin;
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};
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#endif
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