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libretiny-eu / libretiny

PlatformIO development platform for IoT modules
http://docs.libretiny.eu/
MIT License
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BK7231 SPI support #148

Open Maxx-W opened 12 months ago

Maxx-W commented 12 months ago

Hello, I need the Adafruit SPIFlash Library for my project, but SPI currently isn't supported by libretiny with the BK7231N. Can you please tell me whether SPI support is planned for the near future? Alternatively I will have to replace the BK7231N, so it would be of great help.

I found two projects with drivers, but the migration to libretiny is way above my level. https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/driver/drv_spi.c https://github.com/bekencorp/armino/blob/main/middleware/driver/spi/spi_driver.c

kuba2k2 commented 12 months ago

Do you have a smart device with an SPI flash? It's not supported now, mostly because there are virtually no devices that need SPI. I can't say that it's planned for near future; it will probably be implemented for the sake of completeness, but probably not soon enough.

Maxx-W commented 12 months ago

Thank you for the quick reply. I have added the SPI flash on top of the module myself. It is a 3 phase energy meter that has to log the power consumption over a period of time.

kuba2k2 commented 12 months ago

BK7231 has built-in flash, and functions for reading/writing the flash are available in LibreTiny. The flash memory map has a "user data" partition, which you can freely use to store whatever you'd like. It's not super big, but should be way more than enough if done properly.

Maxx-W commented 12 months ago

Thank you for the good hint. Can I also use the "OTA Image" partition if I don't use OTA updates? I thought about it and user data should probably be enough but I'd prefer to have some puffer.

kuba2k2 commented 12 months ago

Yes, you can use the OTA partition, but if you ever decide to flash an OTA update, it will get erased.

Also, data stored directly in the very first block of the OTA partition may confuse the bootloader (and it may wipe that then), so better store the data at a bit bigger offset (like, move 0x1000 from the beginning of OTA partition).

Just make sure to keep away from Network, calibration, etc. partitions.

Maxx-W commented 12 months ago

Thank you so much for the help and libretiny!

fonix232 commented 6 months ago

@kuba2k2 I have a Tuya LED controller using the CBU module (BK7231T) that utilises SPI for communicating with the LEDs. Unfortunately it's not clear which driver they use, however I'd be more than willing to help testing out an SPI component!

The controller in question uses this firmware: https://github.com/tuya-cloudcutter/tuya-cloudcutter.github.io/blob/master/devices/lsc-3008407-led-light-strip-1.0.18.json

However it does not match the looks of the controller: https://github.com/tuya-cloudcutter/tuya-cloudcutter.github.io/blob/master/images/lsc-3008407-led-light-strip-1.0.18.jpg

It is already flashed with ESPHome so it all comes down to having the component available.

yesitsme007 commented 5 months ago

There are appearing a lot of devices now with addressable LEDs. Christmas lights strings, etc. like this. They often seem to be based on a module labelled "WB8" that is not documented on the Tuya developer page. Apparently they use the SPI interface to interface with the LED chain (which seems not be "real" SPI but more a "misuse" to get a high baud rate). I see that there currently is a branch "i2c-spi" 👍 . @kuba2k2: Is this already in a state to give it a try for this purpose?

kuba2k2 commented 5 months ago

SPI is not implemented for Beken chips, not even on that branch.

How do you know it isn't a real SPI interface? Is the LED driver connected to SPI pins of the Beken chip or normal GPIOs? Do you have a pinout of this module?

yesitsme007 commented 5 months ago

Thanks for quick response. According to information from this thread these gadgets use a chain of WS2812 or compatible LEDs. Those kind of LEDs do not have an SPI interface but you can use SPI to address them. The mechanism how this works is explained here. The reason for using SPI is "they need a very precisely clocked data, which on Beken is only possible with P16, through the SPI" (from this thread). I fear no one has figured out a pinout yet. The mentioned forum post says it might be compatible with WB3L. I was not able so far to address UART for reading or flashing firmware. I can only confirm that Vcc and GND matches the pinout of WB3L. Sorry for not having more solid information.