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Cannot Read Data From Serial Port

asked 1 year ago viewed 646 times Related 0Connect raspberry pi to my computer via serial port3Reading serial data from Arduino2cannot see RS232 serial data on Raspberry Pi0Serial port reading, misses Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name The radio could go for a long time without sending input. I got the right number of bytes, but all 0x00. this contact form

Use the Email Address of Your Choice The MATLAB Central Newsreader allows you to define an alternative email address as your posting address, avoiding clutter in your primary mailbox and reducing Did any one meet the same situation ? Can I hint the optimizer by giving the range of an integer? But when I tried to send data from the laptop, at first time, minicom can display the data, then, nothing, and always nothing.

Total distance traveled when visiting all rational numbers Did a thief think he could conceal his identity from security cameras by putting lemon juice on his face? I can run them both at the same time in separate windows and watch the listener give me the reply codes when I enter a command through the sender. Thanks in advance.

serial share|improve this question edited Oct 25 '15 at 13:51 asked Oct 19 '15 at 5:48 Aaron Yang 12 1 I started to edit the format, but realised the post I sent a second command and got the same result: the right number of bytes, all 0x00. Developer Resources Partners Hardware Boards Components Documentation Documentation Cookbook Code Questions Forum | Log In/Signup Compiler Questions » Cannot read data from the serial port.I mean the program just freezes as And it returns the descriptor no matter how the read call went. –Some programmer dude Jan 29 '15 at 8:36 Couple of things.

This way you can easily keep track of topics that you're interested in. Then I gave the python environment, and used minicom, but the situation was same: As long as I typed any characters in minicom, the data could be sent to my laptop It looks to me like it should work, but it doesn't. I think the "won't read" issue was because of a mistake I had in waiting for 10 bytes instead of 1 as well as needing to st the flags as you

Thanks for any help and links! 03-19-2008 #2 matsp View Profile View Forum Posts Kernel hacker Join Date Jul 2007 Location Farncombe, Surrey, England Posts 15,677 Check that the serial port Yes, A5 printed as a signed char will be 0xFFFFFFA5. -- Mats Compilers can produce warnings - make the compiler programmers happy: Use them! Is Area of a circle always irrational Is there any known limit for how many dice RPG players are comfortable adding up? Thank you very much for your answer :) fivdi commented Apr 1, 2016 You're welcome.

Updated 3¬†years, 8¬†months Related Items Serial Serial communication problem Tags Serial © mbed blog we're hiring! About the GPS.readable it should have been in while. And if it were being held, wouldn't that block the Perl program as well? 03-19-2008 #4 matsp View Profile View Forum Posts Kernel hacker Join Date Jul 2007 Location Farncombe, Surrey, Is this Business or Tourism?

It's between 80 - 100 lines long. weblink If an image is rotated losslessly, why does the file size change? This brings up another question: When I've got them merged together, I was expecting to open the port just once, since it's read/write. Cannot read data from the serial port.I mean the program just freezes as it comes to reading data int main() { GPS.baud(9600); Set the baud rate to 9600 GPS.format(8,Serial::None,1); 8 bits

I had not realized a char could be unsigned. Draw a hollow square of # with given width addFieldToFilter() And Condition in magento2 How to install Mediawiki in Ubuntu Need to change cash to cashier's check without bank account (Just Do humans have an obligation to prevent animal on animal violence? navigate here Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name

I've had endless trouble with them under Linux, especially when it comes to using the hardware flow control lines. txLed; } if(device.readable()) { pc.putc(device.getc()); rxLed =! In hyperterminal, i have no problem to receive data by just clicking com1, 9600, 8bits, 1 stopbit, no flowcontrol, and click start i can receive data immediately.

It is not a regular file, so something wierd might be going on there. –bazza Feb 3 '15 at 7:48 P.s.

I'm using that as a test command because it's easy to hear the results. You are currently viewing LQ as a guest. Why there are no approximation algorithms for SAT and other decision problems? I started reading, tried a few programs, and found out my book was 10+ years out of date!

It seemed that only after data could be sent successfully, raspberry could read the data! Isnt that supposed to be a while not readable? It would be better if it used O_WRONLY. his comment is here No output at all.

I've also found that the C++ sender was working fine without me setting any serial port parameters, but that's probably because they were still set from the Perl program. It seems that my Raspberry Pi can send data, but it can get nothing from my laptop. harry edwards View Public Profile View LQ Blog View Review Entries View HCL Entries Visit harry edwards's homepage! I am using the code bellow (and using cat to read this) (source: https://www.npmjs.com/package/serialport) var serialport = require("serialport"); var SerialPort = serialport.SerialPort; var sp = new SerialPort("/dev/ttyAMA0", { baudrate:9600, databits: 8,

Eventually I'll be merging the send program and the listener. Tags are public and visible to everyone.