FastclockRF/src/RadioHead/RHNRFSPIDriver.cpp

112 lines
3.1 KiB
C++

// RHNRFSPIDriver.cpp
//
// Copyright (C) 2014 Mike McCauley
// $Id: RHNRFSPIDriver.cpp,v 1.3 2015/12/16 04:55:33 mikem Exp $
#include "RHNRFSPIDriver.h"
RHNRFSPIDriver::RHNRFSPIDriver(uint8_t slaveSelectPin, RHGenericSPI& spi)
:
_spi(spi),
_slaveSelectPin(slaveSelectPin)
{
}
bool RHNRFSPIDriver::init()
{
// start the SPI library with the default speeds etc:
// On Arduino Due this defaults to SPI1 on the central group of 6 SPI pins
_spi.begin();
// Initialise the slave select pin
// On Maple, this must be _after_ spi.begin
pinMode(_slaveSelectPin, OUTPUT);
digitalWrite(_slaveSelectPin, HIGH);
delay(100);
return true;
}
// Low level commands for interfacing with the device
uint8_t RHNRFSPIDriver::spiCommand(uint8_t command)
{
uint8_t status;
ATOMIC_BLOCK_START;
_spi.beginTransaction();
digitalWrite(_slaveSelectPin, LOW);
status = _spi.transfer(command);
digitalWrite(_slaveSelectPin, HIGH);
_spi.endTransaction();
ATOMIC_BLOCK_END;
return status;
}
uint8_t RHNRFSPIDriver::spiRead(uint8_t reg)
{
uint8_t val;
ATOMIC_BLOCK_START;
_spi.beginTransaction();
digitalWrite(_slaveSelectPin, LOW);
_spi.transfer(reg); // Send the address, discard the status
val = _spi.transfer(0); // The written value is ignored, reg value is read
digitalWrite(_slaveSelectPin, HIGH);
_spi.endTransaction();
ATOMIC_BLOCK_END;
return val;
}
uint8_t RHNRFSPIDriver::spiWrite(uint8_t reg, uint8_t val)
{
uint8_t status = 0;
ATOMIC_BLOCK_START;
_spi.beginTransaction();
digitalWrite(_slaveSelectPin, LOW);
status = _spi.transfer(reg); // Send the address
_spi.transfer(val); // New value follows
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined(__arm__) && defined(CORE_TEENSY)
// Sigh: some devices, such as MRF89XA dont work properly on Teensy 3.1:
// At 1MHz, the clock returns low _after_ slave select goes high, which prevents SPI
// write working. This delay gixes time for the clock to return low.
delayMicroseconds(5);
#endif
digitalWrite(_slaveSelectPin, HIGH);
_spi.endTransaction();
ATOMIC_BLOCK_END;
return status;
}
uint8_t RHNRFSPIDriver::spiBurstRead(uint8_t reg, uint8_t* dest, uint8_t len)
{
uint8_t status = 0;
ATOMIC_BLOCK_START;
_spi.beginTransaction();
digitalWrite(_slaveSelectPin, LOW);
status = _spi.transfer(reg); // Send the start address
while (len--)
*dest++ = _spi.transfer(0);
digitalWrite(_slaveSelectPin, HIGH);
_spi.endTransaction();
ATOMIC_BLOCK_END;
return status;
}
uint8_t RHNRFSPIDriver::spiBurstWrite(uint8_t reg, const uint8_t* src, uint8_t len)
{
uint8_t status = 0;
ATOMIC_BLOCK_START;
_spi.beginTransaction();
digitalWrite(_slaveSelectPin, LOW);
status = _spi.transfer(reg); // Send the start address
while (len--)
_spi.transfer(*src++);
digitalWrite(_slaveSelectPin, HIGH);
_spi.endTransaction();
ATOMIC_BLOCK_END;
return status;
}
void RHNRFSPIDriver::setSlaveSelectPin(uint8_t slaveSelectPin)
{
_slaveSelectPin = slaveSelectPin;
}