MicroPython Forum

The F4 and F7 have irregular sector sizes, starting small then going to 128 KB. Most ports only allocate 64KB cache for erase write. If you want to use all the sectors you have to find contiguous RAM for a 128KB cache which will reduce your heap. There is provision to use the first half of the first...

uPy may report the large fs size based on numblocks, but it won't work. Have you tried filling the fs with files, then editing or replacing them? When you try to change a 512 byte sector in a 128KB flash block the whole 128KB has to be backed up in cache RAM while the block is erased. Then the new s...

You can't just keep extending the number of flash sectors on the F4 because the sectors 6 and higher are 128KB and the cache is only 64KB. There is a mechanism in flashbdev.c to use 64KB from each of sectors 6 and 7. Have a look at the F413 port which shows how to get the largest filesystem on F4. Y...

When you drive an input from a push pull source you don't need a pull-up or pulldown, just a normal high impedance input. You only need a pull resistor if the driving source can become high impedance, eg open drain or tristate. If the ESP32 output is push pull, always either 0V or 3.3V, then the STM...

If you install Python from the Windows Store instead of from a download it installs correctly as Python3.

Thorsten, Your minimal port is similar to mine. The biggest savings come from disabling FLOAT and SPI. SPI costs about 7k. The only other big change I made was to disable the compiler. From memory this saves about 24k (my notes are at work and I am working at home). #define MICROPY_ENABLE_COMPILER (...

Once you have your code frozen it is part of the single bin, hex, elf or dfu file. You can use dfu over serial with the built in bootloader or SWD witb STLINK to program the flash and it should run. If you want to usd the filesystem as well you can setup one unit, then suck a flash image out and use...

It's more than a board directory. Some of the changes are in the port files. I will try to put something useful together. I just nuked my laptop and I haven't installed everything yet so I probably won't be able to do anything until next week. I am not using a filesystem. I debug in RAM using Thonny...

I am developing products using L072, primarily because of its on board EEPROM. I did an exercise first to build a minimum useful STM32 port and got it down to about 150k. Not all features can be disabled in mpconfigboard.h. You need to work through all the config files and disable what you don't nee...

If you are new to MicroPython and don't want to learn how to port it yet you should be able to use the NUCLEO_L432KC port without modification on the QFN STM32L432KC chip. You will have to compile it as the binary is not in the downloads. It reserves 26k flash for the file system, not all of which w...