MicroPython Forum (Archive)

When you open a file you can specify a path. /flash is the path which gets you to the root of the internal flash drive, and /sd gets you to the root of the sdcard. So if you do something like this: >>> file = open('/sd/myfile.txt', 'wb') >>> file.write('This is a test\n') 15 >>> file.close() then it...

So, you could do it the old fashioned way: num = x[0] * 256 + x[1] or alternatively: num = x[0] << 8 | x[1] You could also use: import usruct as struct (num,) = struct.unpack('>h', x) and a little example done on the REPL: >>> import ustruct as struct >>> x = bytearray((1,2)) >>> (num,) = struct.unp...

Nice. This will definitely be on my list of things to look at.

The only thing that may come as a result of that is that there can be bounce when you release the switch as well as when you press the switch. The release bounce can cause falling edges. My normal solution is to have a small state machine for each switch that has 4 states: OFF, BOUNCING_ON, ON, and ...

I'd be interested in one (no specific reason right now - but making noise sounds like fun)

You should be able to use pyb.delay(), just don't use it between disable_irq/enable_irq calls. I think that your problem is probably related to switch bounce. I think I'd move the check for switch value out of the IRQ handler and put it inside the if interruptFlag_1 perhaps after a small delay. I'd ...

I don't know what the max frequency is.

You'll be able to get much shorter pulses using say a hardware timer than by using software.

You can definitely get less than 3 usec pulse. See this discussion: http://forum.micropython.org/viewtopic.php?f=2&t=829

Adding a sleep won't eliminate the race. The correct way to do this is to disable interrupts, check if you should go to sleep and if so call pyb.stop() and then re-enable interrupts. Note: pyb.stop() is doing a WFI call. If a button push occurs after interrupts are disabled and before the WFI, then ...

I compiled the "minimal" port using the ARM compiler and it came in around 78K.

The teensy port (which has USB serial but no UMS) is around 190K.

I decided to back it. Looks like a nice little module:
https://www.kickstarter.com/projects/76 ... ot-and-muc