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linux-fs not found #330
Replies: 15 comments 26 replies
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Just to do an end-to-end check I changed "linuxfs-i2c" to pigpio-i2c and it found pigpio-i2c but got an IllegalStateException trying to do a writeRegister(). so I must have the path correct and I assume "linuxfs-i2c" is correct since I copied it from the EEPROM example.. What's different between pigpio-i2c and linuxfs-i2c that prevents the latter from being found. I see "linuxfs-i2c" in LinuxFsI2CProvider.class so spelling must be correct. I'm using pi4j 2.5 SNAPSHOT.. I tried replacing pi4j-core.jar with pi4j-core-2.1.1 from the download but got a bunch of "cant find" symbol errors. I could really use some thoughts on this. |
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I don't know your development environment. When I build my devices with maven these jars are placed into target/distribution |
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where do you find these downloads? I'm not finding the SNAPSHOT files except for pi4j-2.5. And pi4j-v2-devices I don't see. Do I need plugin-gpio for just i2c? I've defined my own I2C-fs just for the device that requires 16 bit register addresses |
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Another senior moment.. files were all hiding in the pi4j -2.5.0-SNAPSHOT download.. EXCEPT for pi4j-v2-devices-0.0.1.jar I've never needed this jar.. what is it and where is a download? |
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That jar contains my devices so present as i listed my environment. U do not need that jar |
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good. In the meantime: I built the app with the 2.5 SNAPSHOT files and ran it.. It is finding linuxfs-i2c but now I'm getting this exception device 54 (0x36) is the correct address on BUS_1. I'm only reading 8 bytes so where is the overrun? The code in question is: |
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Can you please properly format the code? |
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I didn't know there was a "proper" format.. I've been writing java code for years and this is the way I do it.. We'll have to agree to disagree. Also I'm not a frequent user of github so the format got scrambled some when I posted it. Sorry about that. |
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@eitch was probably referring to the code snippet given above. please use three accents ``` to start and end a code block to make it easily readable here. I corrected it in your reply. |
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Just found the help page for formatting. thanks for fixing it. |
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Been fiddling around and I got rid of the exception for the time being. Following the Adafruit C code example I was reading 8 bytes from the device. I chanted it to 4 bytes and the exception went away. Still not getting cprrect values back though. Thanks for the help from all. Think I'll close this for now.. |
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Does your code read some smaller number of bytes and then try 8, hitting the bug. By reading 1 byte then 8 I was able to duplicate what you encountered. Initially and always 8 worked. I did a pull-request of a fix for this. If approved I will let you know when/how available, but sounds like you may not want it right away if you are making progress around the exception. |
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Yes, all the reads are 4 bytes except this 8 bytes. The. Adafruit has an 8 byte collection of “pseudo” digital pins one of which flags the encoder push button.
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I'm progressing but now I get: using: this code was working at one point today. |
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To make sure I am clear, this particular call to writeRegister(regByte, wData, numBytes); I2CRegisterDataWriter.java:144, had functioned correctly some number of times and then began this failure ? |
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That's correct but in the meantime I had made some small changes in other parts of my code. |
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Well things were working today but getting wrong results. Then the remote I/O exception popped up again.. see above. |
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Powering down and up again sounds like an oldl IT solution :-).. I can do that later but can I just get the linuxfs jar files or is the whole pi4f distribution needed.? either way I'd like it. By the way this is runniing on a pi4j-4B. |
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I did NOT do a snapshot of this fix so there is nothing to download. The other IT trouble report statement. "I didn't do anything, all i did was blah " |
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I will ask for the snapshot. When available you should refresh all the snapshot 2.5 files you presently have in your workspace. I will tell you when available |
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OK, I just powered up the Pi after dinner and get this fooling around after several runs of the app I got this |
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https://pi4j.com/download/ [pi4j-2.5.0-SNAPSHOT.zip (2.36 MiB, 2024-03-03 07:18)] This build contains the fix for the error when you read from the I2C chip 4 bytes and then read 8 bytes. Scratch buffer overrun |
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Seems to be working but still getting garbage from Adafruit.. Also on that remote I/O exception...the one thing I hadn't tried is burning a new SD card.. I did that yesterday and now I haven't gotten that exception any more. Thanks for the 8 byte fix.. I need to quadruple check my Adafruit code.. One read I do (change in encoder position) appears to work but nothing else.. The 8 byte read is to get their pseudo gpio digital pins, but in the doc they say 32 bit result but the code is 64 bit?? |
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Is there any documentation/source for linuxfs? All I have is what Netbeans provides when it decompiles the library methods. Also Netbeans doesn't seem to recognize a offset parameter method call in the read/write bytes methods. Without the offset it shows the parameter names for the method declaration parameters in light text but with offset it just shows "arg1, arg2" etc. I could really use either source of method calls for the linuxfs code that is available for my use. |
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Sources are available here: https://github.com/Pi4J/pi4j-v2/tree/develop/plugins/pi4j-plugin-linuxfs/src/main/java/com/pi4j/plugin/linuxfs |
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I created PullRequest 333 an hour ago. Fixes two other linuxfs methods that are read from a specific register. U can hunt this up in the pi4j code repository for details This change does not include the method in the call stack you sent yesterday. Docs. There is no design doc specific to linuxfs. The couple of linuxfs java files in your call stack are the ones involved in runtime. The pi4j web site snapshot downloads should have a jar of source code. Next i was going to further investigate the exception in yesterday's call stack. It is the most simple code of the various methods, odd it has this intermittent exception |
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So the removal of the initial write creating the ioexception answers my request. It prevents the ioexception. Leave your code with that initial write or a simple read(). I will figure out the real fix. Offset. It is the beginning offset in the buffer for the data to write or the beginning offset to place the read data. So often it is zero. Specifically what method are you questioning the return value ? |
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What do all read write methods return except for the single byte read which obviously returns the desired byte.. Is the return some kind of error code or the number of bytes read or written. I get 30 from a four byte read. |
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looking at your code This doesn't appear to be using a 16 bit register address unless I am missing something. I noticed this elsewhere as noted above. |
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The i2c bus operates with 8 bit , and the devices data sheets use 8 bit(one byte) register address in their details. If, as with your chip, the register requires more than one byte then a unique method is required. |
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Yes and I thought that was what linuxfs was doing.. these examples taken from the source I was referred to for LinuxFsI2C.java do not use the entire 16 bit register address..??? |
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pi4j-2.5.0-SNAPSHOT.zip (2.36 MiB, 2024-03-10 15:23) That is the most recent linuxfs updates. These are Pigpio compatibility updates that may not effect you. However I was able to create your ioexception. Assuming your first linuxfs call is the one using a two byte register address. As an experiment can you place the simple linuxfs read() operation as your first linuxfs access. Please let me know if that stops the ioexceptions ? |
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I'm unable to recreate the original problem. In initializing the encoder I write1, read1, read4, read4, write4, |
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Not certain which encoder you are using, I obtained an adafruit I2C QT Rotary Encoder. Maybe the same and it can help. |
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I gave up on adafruit.. I used some eeprom code as a starting point. It required Linux-fs which is in the pi4j distribution. I gave up and now use sparkfun device. I’ve not seen the attached code. Maybe I’ll go back and try it. Thanks ---------------------------------Ronald T. ***@***.*** NHOn Aug 27, 2024, at 6:57 PM, Tom Aarts ***@***.***> wrote:
Not certain which encoder you are using, I obtained an adafruit I2C QT Rotary Encoder. Maybe the same and it can help.
It arrived and I coded up support using the adafruit python as docs, since this HW company won't release specs on the firmware they have running on the chip.
https://github.com/Pi4J/pi4j-example-devices/blob/master/src/main/java/com/pi4j/devices/rotary_encoder/RotaryEncoderId5880I2C.java
—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you modified the open/close state.Message ID: ***@***.***>
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I found way to fix it you just need to build own context with this provider final var pi4jBuilder = Pi4J.newContextBuilder();
pi4jBuilder.add(new LinuxFsI2CProviderImpl());
final Context pi4j = pi4jBuilder.build();
``` |
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Thanks but I, long ago found a way around this problem |
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My app requires 16 bit i2c register addresses.. I've extracted/tweaked the linus-fs code I need from AT24C512.java compiled and built.. when I run it, the linux-fs provider can't be found. I've put the necessary files where I have the rest of the pi4j files. I'm missing something.
Exception in thread "main" com.pi4j.provider.exception.ProviderNotFoundException: Pi4J provider [linuxfs-i2c] could not be found. Please include this 'provider' JAR in the classpath. at com.pi4j.provider.impl.DefaultRuntimeProviders.get(DefaultRuntimeProviders.java:227) at com.pi4j.provider.impl.DefaultProviders.get(DefaultProviders.java:147) at com.pi4j.provider.Providers.get(Providers.java:253) at com.pi4j.context.Context.create(Context.java:327) at com.pi4j.internal.IOCreator.create(IOCreator.java:58) at com.pi4j.internal.IOCreator.create(IOCreator.java:126) at raspberrypi.I2C_fs.<init>(I2C_fs.java:77) at QWIK.RotaryEncoder.<init>(RotaryEncoder.java:56)The CLASSPATH/ library path (CLASSPATH=:/home/pi/NetBeansProjects/Tune/dist/lib) contains
libpi4j-linuxfs.so pi4j-core.jar pi4j-library-pigpio.jar pi4j-plugin-raspberrypi.jar Utilities.jar log4j-api-2.20.0.jar pi4j-library-linuxfs-2.1.1.jar pi4j-plugin-linuxfs-2.1.1.jar RaspberryPi.jar log4j-core-2.20.0.jar pi4j-library-pigpio-armhf.so pi4j-plugin-pigpio.jar slf4j-api-2.0.9.jarCONSTRUCTOR CODE:
` public I2C_(int nAddr)
{
_pi4j = Pi4J.newAutoContext();
_nAddr = nAddr;
WHAT AM I MISSING
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