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package com.diozero.internal.provider.wiringpi;
import org.pmw.tinylog.Logger;
/*
* #%L
* Device I/O Zero - wiringPi provider
* %%
* Copyright (C) 2016 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 com.diozero.api.*;
import com.diozero.internal.provider.*;
import com.diozero.util.RuntimeIOException;
import com.pi4j.wiringpi.Gpio;
public class WiringPiDeviceFactory extends BaseNativeDeviceFactory {
private static final int PI_PWM_CLOCK_BASE_FREQUENCY = 19_200_000;
private static final int DEFAULT_HARDWARE_PWM_RANGE = 1024;
private static final int DEFAULT_HARDWARE_PWM_FREQUENCY = 100;
private static final int DEFAULT_SOFTWARE_PWM_FREQ = 100;
// See https://projects.drogon.net/raspberry-pi/wiringpi/software-pwm-library/
// You can lower the range to get a higher frequency, at the expense of resolution,
// or increase to get more resolution, but that will lower the frequency
private static final int PI4J_MIN_SOFTWARE_PULSE_WIDTH_US = 100;
private int boardPwmFrequency;
private int hardwarePwmRange;
public WiringPiDeviceFactory() {
// Initialise using native pin numbering scheme
int status = Gpio.wiringPiSetupGpio();
if (status != 0) {
throw new RuntimeException("Error initialising wiringPi: " + status);
}
// Default mode is balanced, actually want mark-space which gives traditional PWM with
// predictable PWM frequencies
setHardwarePwmFrequency(DEFAULT_HARDWARE_PWM_FREQUENCY);
}
@Override
public String getName() {
return getClass().getSimpleName();
}
@Override
public int getBoardPwmFrequency() {
return boardPwmFrequency;
}
@Override
public void setBoardPwmFrequency(int pwmFrequency) {
setHardwarePwmFrequency(pwmFrequency);
}
private void setHardwarePwmFrequency(int pwmFrequency) {
// TODO Validate the requested PWM frequency
hardwarePwmRange = DEFAULT_HARDWARE_PWM_RANGE;
Gpio.pwmSetRange(hardwarePwmRange);
int divisor = PI_PWM_CLOCK_BASE_FREQUENCY / hardwarePwmRange / pwmFrequency;
Gpio.pwmSetClock(divisor);
Gpio.pwmSetMode(Gpio.PWM_MODE_MS);
this.boardPwmFrequency = pwmFrequency;
Logger.info("setHardwarePwmFrequency({}) - range={}, divisor={}",
Integer.valueOf(pwmFrequency), Integer.valueOf(hardwarePwmRange), Integer.valueOf(divisor));
}
private static int calcSoftwarePwmRange(int pwmFrequency) {
return 1_000_000 / (PI4J_MIN_SOFTWARE_PULSE_WIDTH_US * pwmFrequency);
}
@Override
public GpioDigitalInputDeviceInterface createDigitalInputDevice(String key, PinInfo pinInfo, GpioPullUpDown pud,
GpioEventTrigger trigger) throws RuntimeIOException {
return new WiringPiDigitalInputDevice(key, this, pinInfo.getDeviceNumber(), pud, trigger);
}
@Override
public GpioDigitalOutputDeviceInterface createDigitalOutputDevice(String key, PinInfo pinInfo,
boolean initialValue) throws RuntimeIOException {
return new WiringPiDigitalOutputDevice(key, this, pinInfo.getDeviceNumber(), initialValue);
}
@Override
public GpioDigitalInputOutputDeviceInterface createDigitalInputOutputDevice(String key, PinInfo pinInfo,
DeviceMode mode) throws RuntimeIOException {
throw new UnsupportedOperationException("Digital Input / Output devices not yet supported by this provider");
}
@Override
public PwmOutputDeviceInterface createPwmOutputDevice(String key, PinInfo pinInfo, int pwmFrequency,
float initialValue) throws RuntimeIOException {
int gpio = pinInfo.getDeviceNumber();
PwmType pwm_type = PwmType.SOFTWARE;
if (pinInfo instanceof PwmPinInfo) {
pwm_type = PwmType.HARDWARE;
// PWM frequency is shared across all PWM outputs when using hardware PWM
if (pwmFrequency != boardPwmFrequency) {
Logger.warn("Requested PWM frequency ({}) is different to that configured for the board ({})"
+ "; using board value", Integer.valueOf(pwmFrequency), Integer.valueOf(boardPwmFrequency));
}
}
return new WiringPiPwmOutputDevice(key, this, pwm_type,
pwm_type == PwmType.HARDWARE ? hardwarePwmRange : calcSoftwarePwmRange(pwmFrequency), gpio, initialValue);
}
@Override
public AnalogInputDeviceInterface createAnalogInputDevice(String key, PinInfo pinInfo) throws RuntimeIOException {
throw new UnsupportedOperationException("Analog devices aren't supported on this device");
}
@Override
public AnalogOutputDeviceInterface createAnalogOutputDevice(String key, PinInfo pinInfo) throws RuntimeIOException {
throw new UnsupportedOperationException("Analog devices aren't supported on this device");
}
@Override
protected SpiDeviceInterface createSpiDevice(String key, int controller, int chipSelect, int frequency,
SpiClockMode spiClockMode, boolean lsbFirst) throws RuntimeIOException {
return new WiringPiSpiDevice(key, this, controller, chipSelect, frequency, spiClockMode, lsbFirst);
}
@Override
protected I2CDeviceInterface createI2CDevice(String key, int controller, int address, int addressSize, int clockFrequency)
throws RuntimeIOException {
return new WiringPiI2CDevice(key, this, controller, address, addressSize, clockFrequency);
}
}
