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com.diozero.internal.board.odroid.OdroidC2MmapGpio Maven / Gradle / Ivy
package com.diozero.internal.board.odroid;
/*
* #%L
* Organisation: diozero
* Project: diozero - Core
* Filename: OdroidC2MmapGpio.java
*
* This file is part of the diozero project. More information about this project
* can be found at https://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 java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.util.concurrent.ThreadLocalRandom;
import org.tinylog.Logger;
import com.diozero.api.DeviceMode;
import com.diozero.api.GpioPullUpDown;
import com.diozero.api.InvalidModeException;
import com.diozero.internal.spi.MmapGpioInterface;
import com.diozero.util.Hex;
import com.diozero.util.MmapIntBuffer;
import com.diozero.util.SleepUtil;
/**
* See Odroid
* wiringPi fork. Odroid C2 / S905 Datasheet:
* https://dn.odroid.com/S905/DataSheet/S905_Public_Datasheet_V1.1.4.pdf
*/
public class OdroidC2MmapGpio implements MmapGpioInterface {
private static final String MEM_DEVICE = "/dev/mem";
private static final int J2_GPIO_BASE_ADDRESS = 0xC8834000;
private static final int J7_GPIO_BASE_ADDRESS = 0xC8100000;
private static final int BLOCK_SIZE = 4 * 1024;
// XXX Armbian Kernel 5.x has the sysfs GPIO numbers starting at an offset of
// 242 (0xF2) compared to Hardkernel 3.14
// > cat /sys/class/gpio/gpiochip378/base
// 378
private static final int ARMBIAN_J2_GPIO_OFFSET_HACK = 242;
private static final int J2_GPIO_START = 136 + ARMBIAN_J2_GPIO_OFFSET_HACK;
// > cat /sys/class/gpio/gpiochip497/base
// 497
private static final int ARMBIAN_J7_GPIO_OFFSET_HACK = 375;
private static final int J7_GPIO_START = 122 + ARMBIAN_J7_GPIO_OFFSET_HACK;
private static final int J2_GPIODV_GPIO_START = J2_GPIO_START + 45;
private static final int J2_GPIODV_PIN_END = J2_GPIO_START + 74;
private static final int J2_GPIOY_PIN_START = J2_GPIO_START + 75;
private static final int J2_GPIOY_PIN_END = J2_GPIO_START + 91;
private static final int J2_GPIOX_PIN_START = J2_GPIO_START + 92;
private static final int J2_GPIOX_PIN_END = J2_GPIO_START + 114;
private static final int J7_GPIOA_PIN_START = J7_GPIO_START;
private static final int J7_GPIOA_PIN_END = J7_GPIO_START + 14;
private static final int J2_GPIODV_OEN_REG_OFFSET = 0x10C;
private static final int J2_GPIODV_OUT_REG_OFFSET = 0x10D;
private static final int J2_GPIODV_INP_REG_OFFSET = 0x10E;
private static final int J2_GPIODV_PUEN_REG_OFFSET = 0x148;
private static final int J2_GPIODV_PUPD_REG_OFFSET = 0x13A;
private static final int J2_GPIOY_OEN_REG_OFFSET = 0x10F;
private static final int J2_GPIOY_OUT_REG_OFFSET = 0x110;
private static final int J2_GPIOY_INP_REG_OFFSET = 0x111;
private static final int J2_GPIOY_PUEN_REG_OFFSET = 0x149;
private static final int J2_GPIOY_PUPD_REG_OFFSET = 0x13B;
private static final int J2_GPIOX_OEN_REG_OFFSET = 0x118;
private static final int J2_GPIOX_OUT_REG_OFFSET = 0x119;
private static final int J2_GPIOX_INP_REG_OFFSET = 0x11A;
private static final int J2_GPIOX_PUEN_REG_OFFSET = 0x14C;
private static final int J2_GPIOX_PUPD_REG_OFFSET = 0x13E;
private static final int J7_GPIOA_OEN_REG_OFFSET = 0x09;
private static final int J7_GPIOA_OUT_REG_OFFSET = 0x09;
private static final int J7_GPIOA_INP_REG_OFFSET = 0x0A;
private static final int J7_GPIOA_PUEN_REG_OFFSET = 0x0b;
private static final int J7_GPIOA_PUPD_REG_OFFSET = 0x0b;
/*
* private static final int C2_MUX_REG_0_OFFSET = 0x2C; private static final int
* C2_MUX_REG_1_OFFSET = 0x2D; private static final int C2_MUX_REG_2_OFFSET =
* 0x2E; private static final int C2_MUX_REG_3_OFFSET = 0x2F; private static
* final int C2_MUX_REG_4_OFFSET = 0x30; private static final int
* C2_MUX_REG_5_OFFSET = 0x31; private static final int C2_MUX_REG_7_OFFSET =
* 0x33; private static final int C2_MUX_REG_8_OFFSET = 0x34;
*/
// private static final int[] C2_GP_TO_SHIFT_REG = new int[] { //
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, //
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
// 22 };
private boolean initialised;
private MmapIntBuffer j2MmapIntBuffer;
private MmapIntBuffer j7MmapIntBuffer;
// private MmapByteBuffer mmap;
// private volatile IntBuffer gpioIntBuffer;
@Override
public synchronized void initialise() {
if (!initialised) {
// mmap = MmapBufferNative.createMmapBuffer(MEM_DEVICE, C2_GPIO_BASE,
// BLOCK_SIZE);
// gpioIntBuffer =
// mmap.getBuffer().order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();
j2MmapIntBuffer = new MmapIntBuffer(MEM_DEVICE, J2_GPIO_BASE_ADDRESS, BLOCK_SIZE, ByteOrder.LITTLE_ENDIAN);
j7MmapIntBuffer = new MmapIntBuffer(MEM_DEVICE, J7_GPIO_BASE_ADDRESS, BLOCK_SIZE, ByteOrder.LITTLE_ENDIAN);
initialised = true;
}
}
@Override
public synchronized void close() {
if (initialised) {
// MmapBufferNative.closeMmapBuffer(mmap.getFd(), mmap.getAddress(),
// mmap.getLength());
j2MmapIntBuffer.close();
j7MmapIntBuffer.close();
}
}
/*
* Offset to the GPIO Output Enable register
*/
private static final int gpioToOutputEnableRegOffset(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return J2_GPIODV_OEN_REG_OFFSET;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return J2_GPIOY_OEN_REG_OFFSET;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return J2_GPIOX_OEN_REG_OFFSET;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return J7_GPIOA_OEN_REG_OFFSET;
}
return -1;
}
/*
* Offset to the GPIO Output register
*/
private static int gpioToOutputRegOffset(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return J2_GPIODV_OUT_REG_OFFSET;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return J2_GPIOY_OUT_REG_OFFSET;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return J2_GPIOX_OUT_REG_OFFSET;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return J7_GPIOA_OUT_REG_OFFSET;
}
return -1;
}
/*
* Offset to the GPIO Input register
*/
private static final int gpioToInputRegOffset(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return J2_GPIODV_INP_REG_OFFSET;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return J2_GPIOY_INP_REG_OFFSET;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return J2_GPIOX_INP_REG_OFFSET;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return J7_GPIOA_INP_REG_OFFSET;
}
return -1;
}
/*
* Offset to the GPIO Pull up/down enable register
*/
private static int gpioToPullUpDownEnableRegOffset(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return J2_GPIODV_PUEN_REG_OFFSET;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return J2_GPIOY_PUEN_REG_OFFSET;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return J2_GPIOX_PUEN_REG_OFFSET;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return J7_GPIOA_PUEN_REG_OFFSET;
}
return -1;
}
/*
* Offset to the GPIO Pull up/down register
*/
private static int gpioToPullUpDownRegOffset(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return J2_GPIODV_PUPD_REG_OFFSET;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return J2_GPIOY_PUPD_REG_OFFSET;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return J2_GPIOX_PUPD_REG_OFFSET;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return J7_GPIOA_PUPD_REG_OFFSET;
}
return -1;
}
/*
* Offset to the GPIO bit
*/
private static int gpioToRegShiftBit(int gpio) {
if (gpio >= J2_GPIODV_GPIO_START && gpio <= J2_GPIODV_PIN_END) {
return gpio - J2_GPIODV_GPIO_START;
}
if (gpio >= J2_GPIOY_PIN_START && gpio <= J2_GPIOY_PIN_END) {
return gpio - J2_GPIOY_PIN_START;
}
if (gpio >= J2_GPIOX_PIN_START && gpio <= J2_GPIOX_PIN_END) {
return gpio - J2_GPIOX_PIN_START;
}
if (gpio >= J7_GPIOA_PIN_START && gpio <= J7_GPIOA_PIN_END) {
return gpio - J7_GPIOA_PIN_START;
}
return -1;
}
private MmapIntBuffer getMmapIntBuffer(int gpio) {
if (gpio < J7_GPIOA_PIN_START) {
return j2MmapIntBuffer;
}
return j7MmapIntBuffer;
}
@Override
public DeviceMode getMode(int gpio) {
int fsel = gpioToOutputEnableRegOffset(gpio);
int shift = gpioToRegShiftBit(gpio);
// int fsel = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_FSEL_REG_OFFSET :
// C2_GPIOX_FSEL_REG_OFFSET;
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
if (fsel == -1 || shift == -1) {
Logger.error("Invalid GPIO {}", Integer.valueOf(gpio));
return DeviceMode.UNKNOWN;
}
// return (gpioReg.get(fsel) & (1 << shift)) == 0 ? DeviceMode.DIGITAL_OUTPUT :
// DeviceMode.DIGITAL_INPUT;
// switch (gpioIntBuffer.get(fsel) & (1 << shift)) {
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
if (mmap_int_buffer.get(fsel, 1 << shift) == 0) {
return DeviceMode.DIGITAL_OUTPUT;
}
return DeviceMode.DIGITAL_INPUT;
}
@Override
public void setMode(int gpio, DeviceMode mode) {
int fsel = gpioToOutputEnableRegOffset(gpio);
int shift = gpioToRegShiftBit(gpio);
// int fsel = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_FSEL_REG_OFFSET :
// C2_GPIOX_FSEL_REG_OFFSET;
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
if (fsel == -1 || shift == -1) {
Logger.error("Invalid GPIO {}", Integer.valueOf(gpio));
return;
}
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
switch (mode) {
case DIGITAL_INPUT:
// gpioIntBuffer.put(fsel, gpioIntBuffer.get(fsel) | (1 << shift));
// *(gpio + fsel) = (*(gpio + fsel) | (1 << shift));
mmap_int_buffer.put(fsel, mmap_int_buffer.get(fsel) | (1 << shift));
// _pullUpDnControl(origPin, PUD_OFF);
// _pullUpDnControl(origPin, PUD_ON);
break;
case DIGITAL_OUTPUT:
// gpioIntBuffer.put(fsel, gpioIntBuffer.get(fsel) & ~(1 << shift));
// *(gpio + fsel) = (*(gpio + fsel) & ~(1 << shift));
mmap_int_buffer.put(fsel, mmap_int_buffer.get(fsel) & ~(1 << shift));
break;
default:
throw new InvalidModeException("Invalid GPIO mode " + mode + " for pin " + gpio);
}
}
public int getPullUpDown(int gpio) {
int puen = gpioToPullUpDownEnableRegOffset(gpio);
int shift = gpioToRegShiftBit(gpio);
if (puen == -1 || shift == -1) {
Logger.error("Invalid GPIO {}", Integer.valueOf(gpio));
return -1;
}
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
if ((mmap_int_buffer.get(puen) & (1 << shift)) != 0) {
int pupd = gpioToPullUpDownRegOffset(gpio);
if (gpio >= J7_GPIOA_PIN_START) {
shift += 16;
}
return (mmap_int_buffer.get(pupd) & (1 << shift)) == 0 ? 2 : 1;
}
return 0;
}
@Override
public void setPullUpDown(int gpio, GpioPullUpDown pud) {
int shift = gpioToRegShiftBit(gpio);
int puen = gpioToPullUpDownEnableRegOffset(gpio);
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
// int puen = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_PUEN_REG_OFFSET :
// C2_GPIOX_PUEN_REG_OFFSET;
if (puen == -1 || shift == -1) {
Logger.error("Invalid GPIO {}", Integer.valueOf(gpio));
return;
}
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
if (pud == GpioPullUpDown.NONE) {
// Disable Pull/Pull-down resister
// gpioIntBuffer.put(puen, gpioIntBuffer.get(puen) & ~(1 << shift));
// *(gpio + puen) = (*(gpio + puen) & ~(1 << shift));
mmap_int_buffer.put(puen, mmap_int_buffer.get(puen) & ~(1 << shift));
} else {
// Enable Pull/Pull-down resister
// gpioIntBuffer.put(puen, gpioIntBuffer.get(puen) | (1 << shift));
// *(gpio + puen) = (*(gpio + puen) | (1 << shift));
mmap_int_buffer.put(puen, mmap_int_buffer.get(puen) | (1 << shift));
int pupd = gpioToPullUpDownRegOffset(gpio);
if (gpio >= J7_GPIOA_PIN_START) {
shift += 16;
}
// int pupd = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_PUPD_REG_OFFSET :
// C2_GPIOX_PUPD_REG_OFFSET;
if (pud == GpioPullUpDown.PULL_UP) {
// gpioIntBuffer.put(pupd, gpioIntBuffer.get(pupd) | (1 << shift));
// *(gpio + pupd) = (*(gpio + pupd) | (1 << shift));
mmap_int_buffer.put(pupd, mmap_int_buffer.get(pupd) | (1 << shift));
} else {
// gpioIntBuffer.put(pupd, gpioIntBuffer.get(pupd) & ~(1 << shift));
// *(gpio + pupd) = (*(gpio + pupd) & ~(1 << shift));
mmap_int_buffer.put(pupd, mmap_int_buffer.get(pupd) & ~(1 << shift));
}
}
}
@Override
public boolean gpioRead(int gpio) {
int reg = gpioToInputRegOffset(gpio);
int shift = gpioToRegShiftBit(gpio);
// int reg = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_INP_REG_OFFSET :
// C2_GPIOX_INP_REG_OFFSET;
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
if (reg == -1 || shift == -1) {
Logger.error("Invalid GPIO {}", Integer.valueOf(gpio));
return false;
}
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
// return (gpioIntBuffer.get(gp_lev_reg) & (1 << shift)) != 0;
/*-
if ((*(gpio + reg) & (1 << shift)) != 0)
return HIGH;
else
return LOW;
*/
return (mmap_int_buffer.get(reg) & (1 << shift)) != 0;
}
@Override
public void gpioWrite(int gpio, boolean value) {
// Note no boundary checks to maximise performance
int reg = gpioToOutputRegOffset(gpio);
int shift = gpioToRegShiftBit(gpio);
if (gpio >= J7_GPIOA_PIN_START) {
shift += 16;
}
// int reg = gpio < C2_GPIOX_PIN_START ? C2_GPIOY_OUTP_REG_OFFSET :
// C2_GPIOX_OUTP_REG_OFFSET;
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
MmapIntBuffer mmap_int_buffer = getMmapIntBuffer(gpio);
if (value) {
// gpioIntBuffer.put(reg, gpioIntBuffer.get(reg) | (1 << shift));
// *(gpio + reg) |= (1 << shift);
mmap_int_buffer.put(reg, mmap_int_buffer.get(reg) | (1 << shift));
} else {
// gpioIntBuffer.put(reg, gpioIntBuffer.get(reg) & ~(1 << shift));
// *(gpio + reg) &= ~(1 << shift);
mmap_int_buffer.put(reg, mmap_int_buffer.get(reg) & ~(1 << shift));
}
}
public static void main(String[] args) {
System.out.println(ByteOrder.nativeOrder());
if (args.length != 2) {
System.out.println("Usage: " + OdroidC2MmapGpio.class.getName() + " ");
System.exit(1);
}
int gpio = Integer.parseInt(args[0]);
int iterations = Integer.parseInt(args[1]);
int gp_set_reg = gpio < J2_GPIOX_PIN_START ? J2_GPIOY_OUT_REG_OFFSET : J2_GPIOX_OUT_REG_OFFSET;
int gp_set_reg2 = gpioToOutputRegOffset(gpio);
System.out.println("gp_set_reg=" + gp_set_reg + ", gp_set_reg2=" + gp_set_reg2);
// int shift = C2_GP_TO_SHIFT_REG[gpio - C2_GPIOY_PIN_START];
// int shift2 = gpioToShiftReg(gpio);
// System.out.println("shift=" + shift + ", shift2=" + shift2);
int gp_lev_reg = gpio < J2_GPIOX_PIN_START ? J2_GPIOY_INP_REG_OFFSET : J2_GPIOX_INP_REG_OFFSET;
int gp_lev_reg2 = gpioToInputRegOffset(gpio);
System.out.println("gp_lev_reg=" + gp_lev_reg + ", gp_lev_reg2=" + gp_lev_reg2);
int gp_fsel_reg = gpio < J2_GPIOX_PIN_START ? J2_GPIOY_OEN_REG_OFFSET : J2_GPIOX_OEN_REG_OFFSET;
int gp_fsel_reg2 = gpioToOutputEnableRegOffset(gpio);
System.out.println("gp_fsel_reg=" + gp_fsel_reg + ", gp_fsel_reg2=" + gp_fsel_reg2);
System.out.format("gpioToGPSETReg(%d)=0x%04x%n", Integer.valueOf(214),
Integer.valueOf(gpioToOutputRegOffset(214)));
System.out.format("gpioToGPSETReg(%d)=0x%04x%n", Integer.valueOf(219),
Integer.valueOf(gpioToOutputRegOffset(219)));
System.out.format("gpioToGPFSELReg(%d)=0x%04x%n", Integer.valueOf(214),
Integer.valueOf(gpioToOutputEnableRegOffset(214)));
System.out.format("gpioToGPFSELReg(%d)=0x%04x%n", Integer.valueOf(219),
Integer.valueOf(gpioToOutputEnableRegOffset(219)));
try (OdroidC2MmapGpio mmap_gpio = new OdroidC2MmapGpio()) {
mmap_gpio.initialise();
/*
* BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
* try { while (true) { Hex.dumpIntBuffer(mmap_gpio.gpioIntBuffer,
* C2_GPIO_PIN_BASE, 200); String line = reader.readLine(); if (line == null ||
* line.equals("q")) { break; } } } catch (IOException e) { // TODO
* Auto-generated catch block e.printStackTrace(); }
*/
System.out.println("getMode(" + gpio + ")=" + mmap_gpio.getMode(gpio));
mmap_gpio.setMode(gpio, DeviceMode.DIGITAL_OUTPUT);
System.out.println("getMode(" + gpio + ")=" + mmap_gpio.getMode(gpio));
System.out.println("Current val=" + mmap_gpio.gpioRead(gpio));
for (int i = 0; i < 5; i++) {
System.out.println("on");
mmap_gpio.gpioWrite(gpio, true);
System.out.println("Current val=" + mmap_gpio.gpioRead(gpio));
SleepUtil.sleepSeconds(1);
System.out.println("off");
mmap_gpio.gpioWrite(gpio, false);
System.out.println("Current val=" + mmap_gpio.gpioRead(gpio));
SleepUtil.sleepSeconds(1);
}
boolean exit = false;
if (exit) {
System.exit(1);
}
if (true) {
long start_ms = System.currentTimeMillis();
for (int i = 0; i < iterations; i++) {
mmap_gpio.gpioWrite(gpio, true);
mmap_gpio.gpioWrite(gpio, false);
}
long duration_ms = System.currentTimeMillis() - start_ms;
double frequency = iterations / (duration_ms / 1000.0);
System.out.format("Duration for %,d iterations: %,.3f s, frequency: %,.0f Hz%n",
Integer.valueOf(iterations), Float.valueOf(((float) duration_ms) / 1000),
Double.valueOf(frequency));
}
for (int i = 0; i < 5; i++) {
System.out.println("on");
mmap_gpio.gpioWrite(gpio, true);
SleepUtil.sleepSeconds(1);
System.out.println("off");
mmap_gpio.gpioWrite(gpio, false);
SleepUtil.sleepSeconds(1);
}
}
}
public static void test() {
final ThreadLocalRandom rand = ThreadLocalRandom.current();
IntBuffer buffer = ByteBuffer.allocateDirect(500).asIntBuffer();
for (int i = 0; i < buffer.capacity(); i++) {
buffer.put(rand.nextInt());
}
buffer.flip();
Hex.dumpIntBuffer(buffer, 0, 2);
}
}
