Point Labs / RadioHeadLite

This driver is a stripped down version of the Radiohead 1.45 driver, and covers fewer radios. Threading and an event queue have been added to make the ISR's more stable across architectures. Specifically The STM32L4 parts

Dependents:   Threaded_LoRa_Modem

RHSPIDriver.cpp

Committer:
rlanders73
Date:
2021-06-23
Revision:
7:250d1c72df36
Parent:
0:ab4e012489ef

File content as of revision 7:250d1c72df36:

// RHSPIDriver.cpp
//
// Copyright (C) 2014 Mike McCauley
// $Id: RHSPIDriver.cpp,v 1.9 2014/05/03 00:20:36 mikem Exp $

#include <RHSPIDriver.h>

RHSPIDriver::RHSPIDriver(PINS slaveSelectPin, RHGenericSPI& spi)
    : 
    _spi(spi),
    _slaveSelectPin(slaveSelectPin)
{
}

bool RHSPIDriver::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
#if (RH_PLATFORM != RH_PLATFORM_MBED)
    pinMode(_slaveSelectPin, OUTPUT);
#endif
    digitalWrite(_slaveSelectPin, HIGH);

    delay(100);
    return true;
}

uint8_t RHSPIDriver::spiRead(uint8_t reg)
{
    uint8_t val;
    ATOMIC_BLOCK_START;
    digitalWrite(_slaveSelectPin, LOW);
    _spi.transfer(reg & ~RH_SPI_WRITE_MASK); // Send the address with the write mask off
    val = _spi.transfer(0); // The written value is ignored, reg value is read
    digitalWrite(_slaveSelectPin, HIGH);
    ATOMIC_BLOCK_END;
    return val;
}

uint8_t RHSPIDriver::spiWrite(uint8_t reg, uint8_t val)
{
    uint8_t status = 0;
    ATOMIC_BLOCK_START;
    digitalWrite(_slaveSelectPin, LOW);
    status = _spi.transfer(reg | RH_SPI_WRITE_MASK); // Send the address with the write mask on
    _spi.transfer(val); // New value follows
    digitalWrite(_slaveSelectPin, HIGH);
    ATOMIC_BLOCK_END;
    return status;
}

uint8_t RHSPIDriver::spiBurstRead(uint8_t reg, uint8_t* dest, uint8_t len)
{
    uint8_t status = 0;
    ATOMIC_BLOCK_START;
    digitalWrite(_slaveSelectPin, LOW);
    status = _spi.transfer(reg & ~RH_SPI_WRITE_MASK); // Send the start address with the write mask off
    while (len--)
	*dest++ = _spi.transfer(0);
    digitalWrite(_slaveSelectPin, HIGH);
    ATOMIC_BLOCK_END;
    return status;
}

uint8_t RHSPIDriver::spiBurstWrite(uint8_t reg, const uint8_t* src, uint8_t len)
{
    uint8_t status = 0;
    ATOMIC_BLOCK_START;
    digitalWrite(_slaveSelectPin, LOW);
    status = _spi.transfer(reg | RH_SPI_WRITE_MASK); // Send the start address with the write mask on
    while (len--)
	_spi.transfer(*src++);
    digitalWrite(_slaveSelectPin, HIGH);
    ATOMIC_BLOCK_END;
    return status;
}