M5stack new joystick example

YigalB

Is there an example how to connect the new joystick (I assumd i2c only) to esp32? How to access the joystick status? Also, is it delivered with firmware installed?

teastain

@YigalB I2C is correct.
Here is the example:
https://github.com/m5stack/M5Unit-Joystick2/blob/main/examples/get_value/get_value.ino
The internal firmware is already installed and like most M5Stack Units it is 'permanent' and does not require your attention but could theoretically be updated in the future.

YigalB

@teastain Thank you! Exactly what I needed to know.

Another thing that bothers me: When looking at the I2C protocol in the documentation, it states the "I2C address" is RW (read write).

I assume the Write part is in order to change the address - probably in order to include 2 joysticks at same time. Is this command stored on a non volatile memory? Or is it needed to be executed every power up?
if 2 joysticks are connected in parallel, how is it possible to direct the command from the master to a specific one?

Of course, if the answer to 1 is yes, this can be easily done with step by step.
(or if there are jumpers on board the joystick).

teastain

@YigalB Two Joysticks would require a PaHub accessory from M5Stack:
https://shop.m5stack.com/products/i2c-hub-1-to-6-expansion-unit-pca9548apw
These work very well, seamlessly.
I don't know how to change the I2C address of the Joystick in this register, sorry.

YigalB

@teastain Yes, using I2C splitter is a practical solution for using I2C devices with same address. I use it often.
Yet the "Write" ability caught my attention, since it is saving the need for the splitter.

I will try approaching the customer service.

felmue

Hello @YigalB

yes, the I2C address is stored in flash. There is no need to repeat that step (changing I2C address) after every power up. It just needs to be done once.

Alternatively you can use a PaHub like @teastain suggested.

Thanks
Felix