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package com.diozero.api;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: SpiDevice.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import org.tinylog.Logger;
import com.diozero.internal.spi.NativeDeviceFactoryInterface;
import com.diozero.sbc.DeviceFactoryHelper;
/**
* Serial Peripheral Interface device
*/
public class SpiDevice implements SpiDeviceInterface {
/**
* I2C device builder. Default values:
*
*
controller: 0
*
frequency: 2MHz
*
clockMode: Mode 0
*
lsbFirst: false
*
*/
public static class Builder {
private int controller = SpiConstants.DEFAULT_SPI_CONTROLLER;
private int chipSelect;
private int frequency = SpiConstants.DEFAULT_SPI_CLOCK_FREQUENCY;
private SpiClockMode clockMode = SpiConstants.DEFAULT_SPI_CLOCK_MODE;
private boolean lsbFirst = SpiConstants.DEFAULT_LSB_FIRST;
protected Builder(int chipSelect) {
this.chipSelect = chipSelect;
}
/**
* Set the SPI controller number
*
* @param controller the SPI controller number
* @return this builder instance
*/
public Builder setController(int controller) {
this.controller = controller;
return this;
}
/**
* SPI chip select number
*
* @param chipSelect the chip select number
* @return this builder instance
*/
public Builder setChipSelect(int chipSelect) {
this.chipSelect = chipSelect;
return this;
}
/**
* Set the SPI clock frequency
*
* @param frequency the SPI clock frequency
* @return this builder instance
*/
public Builder setFrequency(int frequency) {
this.frequency = frequency;
return this;
}
/**
* Set the SPI {@link SpiClockMode clock mode}
*
* @param clockMode
* @return this builder instance
*/
public Builder setClockMode(SpiClockMode clockMode) {
this.clockMode = clockMode;
return this;
}
/**
* Set the byte order
*
* @param lsbFirst True for little endian
* @return this builder instance
*/
public Builder setLsbFirst(boolean lsbFirst) {
this.lsbFirst = lsbFirst;
return this;
}
/**
* Provision a new SPI device
*
* @return a new SPI device instance
*/
public SpiDevice build() {
return new SpiDevice(controller, chipSelect, frequency, clockMode, lsbFirst);
}
}
/**
* Construct a new SPI device builder instance using the specified chip select value
*
* @param chipSelect SPI chip select
* @return SPI device builder
*/
public static Builder builder(int chipSelect) {
return new Builder(chipSelect);
}
private SpiDeviceInterface delegate;
private int maxBufferSize;
public SpiDevice(int chipSelect) throws RuntimeIOException {
this(SpiConstants.DEFAULT_SPI_CONTROLLER, chipSelect, SpiConstants.DEFAULT_SPI_CLOCK_FREQUENCY,
SpiConstants.DEFAULT_SPI_CLOCK_MODE, SpiConstants.DEFAULT_LSB_FIRST);
}
public SpiDevice(int controller, int chipSelect) throws RuntimeIOException {
this(controller, chipSelect, SpiConstants.DEFAULT_SPI_CLOCK_FREQUENCY, SpiConstants.DEFAULT_SPI_CLOCK_MODE,
SpiConstants.DEFAULT_LSB_FIRST);
}
public SpiDevice(int controller, int chipSelect, int frequency, SpiClockMode mode, boolean lsbFirst)
throws RuntimeIOException {
NativeDeviceFactoryInterface ndf = DeviceFactoryHelper.getNativeDeviceFactory();
delegate = ndf.provisionSpiDevice(controller, chipSelect, frequency, mode, lsbFirst);
maxBufferSize = ndf.getSpiBufferSize();
}
/**
* {@inheritDoc}
*/
@Override
public String getKey() {
return delegate.getKey();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isOpen() {
return delegate.isOpen();
}
/**
* {@inheritDoc}
*/
@Override
public void close() throws RuntimeIOException {
Logger.trace("close()");
delegate.close();
}
/**
* {@inheritDoc}
*/
@Override
public int getController() {
return delegate.getController();
}
/**
* {@inheritDoc}
*/
@Override
public int getChipSelect() {
return delegate.getChipSelect();
}
/**
* {@inheritDoc}
*/
@Override
public void write(byte... txBuffer) throws RuntimeIOException {
int written = 0;
do {
int to_write = Math.min(txBuffer.length - written, maxBufferSize);
delegate.write(txBuffer, written, to_write);
written += to_write;
} while (written < txBuffer.length);
}
/**
* {@inheritDoc}
*/
@Override
public void write(byte[] txBuffer, int txOffset, int length) throws RuntimeIOException {
delegate.write(txBuffer, txOffset, length);
}
/**
* {@inheritDoc}
*/
@Override
public byte[] writeAndRead(byte... out) throws RuntimeIOException {
return delegate.writeAndRead(out);
}
}
