MicroPython Forum (Archive)

I'll give a try with the app I'm currently developing, which uses a lot of constants (this is a port from a C app, which uses a lot of #define) :

https://github.com/fma38/micropython/tree/master/baos

Ok, I understand ; it is a speed-vs-size tool...

Thanks for the explanation.

Sorry, but I don't really understand what is said in the post; I'm not a C-coder

It's a constant from a C-dev point of view, am I right?

But from a python point of view, how and when should I use it? What are the pros and cons?

Still not sure to clearly understand what it does... I made a quick test, and it seems that it consumes memory

Hi!

Reading code from the mpr121 module, I discovered that the author used a const() function to define some constants.

What exactly does this function()? Is it to put the value in the flash, rather than in memory?

Great! But as I understand from your post on the other thread, the call to send() is still blocking during transfert, so CPU is not availabe for other tasks. Am I right?

So, DMA usage is totally transparent?

Why don't you use a real UART on the pyboard, and connect it to your PC using a USB-TTL cable (FTDI)? This way, you keep your usb line for console and program transfert (using pyboard.py), and you have a dedicated serial line to send your own commands...

Have a look at the pyboard.py script, which is uses to transmit and run scripts to pyboard...

@ulrich, the port /dev/ttyACM0 is bind to the virtual serial line over usb; UART(1) is a real serial line, connected to X9/X10: http://micropython.org/resources/pybv10-pinout.jpg If you want to test this real serial line, you need to connect it to your PC, through a FTDI cable, for example (USB-TTL,...