Sketch where Read characteristics don't work

[crfrancis]

I've attached a sketch, which is a cut-down version of one I'm working on. It sets one service with 5 characteristics: one write, 2 notify and 2 read. The write and notify ones work as expected, but not the reads. If I upload this to a fresh Arduino 101, with the "101 Firmware Updater" programmer, it flashes the new firmware (with the 2.0.2 board manager). Then with LightBlue on the iPhone I can see the device, the service and the characteristics, but I can't read the 2 read values. The same with my own C++ code on an R-Pi (BlueZ 5.46 installed). I have another sketch with 3 characteristics, and that works properly. cheers, Richard

LasersRemote30debug.zip

[crfrancis]

I've been working on this issue for weeks now, but today made a breakthrough, with a reproducible cause.

It's the analogRead() which is to blame. I tried all 6 pins and the result is the same. Reading the characteristic doesn't work.

But if you comment out the call to readLaserVoltage() in the example I posted, the problem goes away.

cheers, Richard

[crfrancis]

Here is an update to the sketch which demonstrates the problem. It has 37 lines. Using, for example, LightBlue on an iPhone reveals the problem. Commenting out line 35 laserVolts = analogRead(VOLTS_PIN); // try commentinng out this line will stop the error.

cheers, Richard