英文:
Raspberry pi 4 controle GPIO with java
问题
我想使用Java控制我的树莓派4上的16*2液晶显示屏。问题是，Pi4J - 这个可以用来在Java中修改GPIO的解决方案尚未更新到树莓派4。是否有其他的解决方案？在我启动程序时会出现以下错误：
pi@raspberrypi:~/desktop/gpio $ sudo ./start.sh
<--Pi4J--> GPIO Control Example ... started. Maista
无法确定硬件版本。我看到：硬件 : BCM2711
，
- 期望 BCM2708 或 BCM2709。
如果这是一个真正的树莓派，请将此问题报告给 projects@drogon.net。如果这不是树莓派，那么由于wiringPi仅设计用于支持树莓派，您将需要自行解决。
英文:
I want to controle a 16*2 lcd display on my raspberry pi4 with java. The problem is that Pi4J - the solution to modify the gpios with java is not updated to pi4. Is there another solution? This error occures when I start the programm:
pi@raspberrypi:~/desktop/gpio $ sudo ./start.sh
<--Pi4J--> GPIO Control Example ... started. Maista
Unable to determine hardware version. I see: Hardware : BCM2711
,
- expecting BCM2708 or BCM2709.
If this is a genuine Raspberry Pi then please report this
to projects@drogon.net. If this is not a Raspberry Pi then you
are on your own as wiringPi is designed to support the
Raspberry Pi ONLY.
答案1
得分: 5
Pi4J使用WiringPi来控制GPIO。因此，请将其更新到版本2.52，因为这个版本支持树莓派4，详见http://wiringpi.com/wiringpi-updated-to-2-52-for-the-raspberry-pi-4b/
$ gpio -v
gpio版本：2.50
$ cd /tmp
$ wget https://project-downloads.drogon.net/wiringpi-latest.deb
$ sudo dpkg -i wiringpi-latest.deb
$ gpio -v
gpio版本：2.52
你可以在我的博客上找到一个完整的Java + Pi4J + LCD示例，网址为https://webtechie.be/post/2020-01-26-openweathermap-forecast-on-lcd-with-raspberry-pi-java-and-pi4j/
英文:
Pi4J uses WiringPi to control the GPIOs. So please update it to version 2.52 as this one supports the Raspberry Pi 4, see http://wiringpi.com/wiringpi-updated-to-2-52-for-the-raspberry-pi-4b/
$ gpio -v
gpio version: 2.50
$ cd /tmp
$ wget https://project-downloads.drogon.net/wiringpi-latest.deb
$ sudo dpkg -i wiringpi-latest.deb
$ gpio -v
gpio version: 2.52
You can find a full java+pi4j+lcd example on my blog on https://webtechie.be/post/2020-01-26-openweathermap-forecast-on-lcd-with-raspberry-pi-java-and-pi4j/
答案2
得分: 0
我找到了导致它无法正常工作的原因，就是因为 sudo dpkg -i wiringpi-latest.deb 将 gpio 安装在 /usr/bin/gpio，但是在 /usr/local/bin/gpio 目录下还有另一个 gpio 文件，它具有优先权。您可以通过运行 which gpio 来查看您是否也是这种情况。
我将旧文件从 gpio 重命名为 gpio.old（我不想删除它，以防万一），然后再次执行 sudo dpkg -i wiringpi-latest.deb。现在当我运行 which gpio 时，我找到了正确的可执行文件。
英文:
I found out the reason it was not working for me, is that sudo dpkg -i wiringpi-latest.deb installs gpio in /usr/bin/gpio but there was another gpio file in /usr/local/bin/gpio which was taking precedence. You can find if this is the case for you by running which gpio.
I renamed the old file from gpio to gpio.old (I did not want to delete it, just in case) and executed sudo dpkg -i wiringpi-latest.deb again. Now when I run which gpio I find the correct executable.
答案3
得分: -1
我找到了这个可以帮助你。
这似乎很容易理解，你只需要更改一些xml文件。
英文:
I found this that can help you.
It seems easy to understand, you just need to change some xml files.
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