MicroPython Forum (Archive)

Using const allows optimisation, but retains compatibility with Python semantics (as much as possible). The idea is that you want to substitute the constant value directly in your code. If you write some Python code that uses a (global) variable, then looking up that global variable is relatively ex...

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? Right. First step was to get DMA working, and main reason for that was to get uninterrupted transfers with interrupts enabled. Pr...

fma wrote:So, DMA usage is totally transparent?

Yes. If interrupts are enabled it uses DMA, otherwise it uses polling.

Downloading the latest micropython-master.zip file from micropython.org/download, and running make BOARD=STM32F4DISC in the stmhal directory works fine for me.

I suspect that your build process can't find arm-none-eabi-gcc. Is it in your path? Can you execute arm-none-eabi-gcc on the command line?

Answer: No, as this uses SDIO, SD card on the header pins would have to use SPI - SD card over SPI hast yet to be implemented. Right. The hardware has builtin SDIO support and the driver is designed around that. The pins are hardwired. It's not a priority for me, but if someone wants to submit a dr...

Lastest revision looks great! What next, off to the PCB house?

You can use Micro Python for more than just hobby projects! If you are interested in many boards please contact us directly. We can provide 100s within a few days if needed. For more than that we can go to the manufacturer and it would be around 1 month lead time. If you want more than 10k units I s...

It has a Cortex M0 coprocessor for the "real time HW interface". So the SoC itself is probably only doing high level stuff.

All these things are possible. I think the DMA even includes an irq for transfer half complete. Could use select module to determine when transfer is complete (but that could be overkill for such a simple check). I consider exposing DMA as an object, since it has so many options, but I think it migh...

Thanks blmorris, looks good! Here are some points regarding your design: We don't need to use X1-X4 for the servo control. Any IO with PWM capability will work just fine. But X1-X4 are the best to use because they connect to 1 timer with its 4 channels. Can you put a mounting hole in the bottom righ...