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I am using the VisuSerialCom example project - albeit altered - to read an integer from an Arduino, which sends it every second as a high and low byte in order.
I've edited the project to receive the data as an array of 1 int and it displays properly. That integer is a base number plus a randomization band (i.e. 6000 + random number between -100 and +100), hence the update every second is important to capture the most recent value.
The problem I run into is this: After running for a while, the number reads suffer from very severe lag. I can force the Arduino output to zero manually and observe that change immediately on an attached 7-segment display as well as on an oscilloscope.
I left the program running for 12 hours and the lag is now at about 25 minutes. So I force a change to zero, and the Raspberry Pi with the modified VisuSerialCom project still updates the number once every second, but it will take about 25 minutes of 1-second updates before the value goes to zero.
What should I be looking at to fix this? Perhaps forcibly flush the readBuffer after every read? (How do I do that?)
Thanks for any help,
Matt
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Never mind - I think the problem is gone now. I reduced the read delay from 1000 ms to 250 ms and the delay appears gone, even after running the application for two hours.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I am using the VisuSerialCom example project - albeit altered - to read an integer from an Arduino, which sends it every second as a high and low byte in order.
I've edited the project to receive the data as an array of 1 int and it displays properly. That integer is a base number plus a randomization band (i.e. 6000 + random number between -100 and +100), hence the update every second is important to capture the most recent value.
The problem I run into is this: After running for a while, the number reads suffer from very severe lag. I can force the Arduino output to zero manually and observe that change immediately on an attached 7-segment display as well as on an oscilloscope.
I left the program running for 12 hours and the lag is now at about 25 minutes. So I force a change to zero, and the Raspberry Pi with the modified VisuSerialCom project still updates the number once every second, but it will take about 25 minutes of 1-second updates before the value goes to zero.
What should I be looking at to fix this? Perhaps forcibly flush the readBuffer after every read? (How do I do that?)
Thanks for any help,
Matt
For what it is worth, the delay in the read block is set to 1000 ms. The Arduino writes a new value to its serial port every 1000 ms.
Never mind - I think the problem is gone now. I reduced the read delay from 1000 ms to 250 ms and the delay appears gone, even after running the application for two hours.