MicroPython Forum

I found an interesting project https://github.com/Nikolay-Kha/PyCNC Typically there is no way to control stepper motors from Linux runtime environment due to the lack of real time GPIO control. Even kernel based modules can not guarantee precise control of pulses for steppers. However, we can use a ...

I know you could add a SPI RAM and use it to read/write from (like a disk). I don't know if the stm32 used in the SF2 will transparently make it behave like internal RAM. You'll need to read through the datasheet and see if it supports something like that. Thank you, if there is an idea, I will try...

I'm not sure - you'd need to check the datasheet for the SF2 and find out what it supports for external RAM, and then see if the pins to support that are available on WBUS. And even then, I don't know what state micropython is in as far as supporting external RAM on the stm32. You'd probably need t...

RAM is voltaile and can be changed. Flash is non-volatile and can't be changed like RAM. In order to change flash, you need to erase a block first and then write the contents of the block with the new data. When you power off your MCU flash retains its contents and RAM doesn't. On the SF2, one of t...

dhylands wrote: ↑

Thu Jun 27, 2019 9:01 pm

No - this extends the flash, and not the RAM.

I don't understand the difference between the two QSPI FLASH on SF2. I thought 'code execution capabilities'='Memory mapping'. I find that ESP32 supports external SPI RAM.

2MByte external flash with code execution capabilities (extends internal flash)

I want to ask, is this the same as the internal RAM of the chip? Can pyboard(STM32F405) increase RAM (Memory mapping) in this way? Thanks.

The other option is to use a chip such as the STM L6470. As I understand it you pass the chip a target and it handles microstepping and step rate limitations automatically. I read the L6470 datasheet. It is similar to the TMC5130 I am currently using. It is very convenient to control a single stepp...

@OutoftheBOTS This is really a good idea. But I don't know how to create function in C, I just add the .py file to '../micropython/ports/stm32/modules' and make the micropython firmware. Is there any documentation I missed?

Many years ago I transplant the GRBL code to STM32F1 and it works well.
I think micropython can do the same.

I use the W25Q128 configuration on PYBV10 as follows： // use external SPI flash for storage #define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0) #define MICROPY_HW_SPIFLASH_SIZE_BITS (128 * 1024 * 1024) #define MICROPY_HW_SPIFLASH_CS (pin_A2) #define MICROPY_HW_SPIFLASH_SCK (pin_A5) #define MICROPY_...