No response from the m5 team on twitter so I returned it through Amazon.

@m5mpy microcode is very low level, I like how these MCU bring back old memories and old hacks like I used to do on Amiga. And how in general they force into better programming habits.
So what I'm trying to do is general purpose signal camera. At the moment, a sound camera will do. From what I was told on eevblog, I need one FFT per microphone to calculate inter-mic delay. So far Arduino FFT switched to uint32 (faster on esp32 than uin8 I'm told) I'm getting 512 bins at 12 ms, which is't very zippy as I'll need 4 cameras at least. Not that big a deal because I don't need 60fps refresh but ... well, that would be nice :D
As for the frequency, at the moment I'm interested in detecting the origin of low frequency sound as they're notoriously difficult to locate by ear. Eventually I'd like to expand into an EMF camera.

Concise code for sure. I need all the speed I can get so it'll be Arduino for now.
I'm surprised you wouldn't see any flicker on the display since you print every frame, also surprised that there is no clearScreen preceding the print. I'm thinking the python print has a background.

So @JimiT I tested the port, 5V flows through so the lower module has a problem.

I noticed that some stm32 have very accelerated FFT and even the Klei library has one included. I was wondering if the esp32 had something good, (Arduino FFT doesn't count)

What's the deal with the 5V pin, 0V on it, by design?

@wtakuo Thank you!

@jimit 在 Is M5Cloud down? 中说：

@m5mpy Great to hear... thanks for updating status....

you use cloud? how does it compare with arduino ide or ... platformIO
Calun should pop in any time now ;)

@calin 在 M5Stack MultiApp Firmware 中说：

M5Stack MultiApp Advanced released: http://forum.m5stack.com/topic/194/m5stack-multiapp-advanced-firmware
Back to PlatformIO IDE :)

With Web Radio and wifi auto-connection WPS!

answer: use the TFT_eSPI library, you can pass transparency color in the sprite draw functions