Jetson Nano LED control

PaintedSnipe · December 8, 2020, 3:29pm

Hi,

Have the APA102 LEDs been tested on Jetson-Nano? We have encountering some trouble with LED control as explain below:

(1) We have installed the drivers/dtb for “ReSpeaker 2-MIC” board on “Jetson-Nano” as per instructions from here:

Seeed-Studio/seeed-linux-dtoverlays/blob/master/modules/jtsn-wm8960/README.md

# Run ReSpeaker 2-Mics Pi HAT/WM8960 on Jetson Nano

For Jetson source R32.4.2 or JetPack Image 4.4

### 1. Clone repo
```shell
	cd; git clone https://github.com/Seeed-Studio/seeed-linux-dtoverlays
	cd ~/seeed-linux-dtoverlays
```

### 2. Build dtbo & driver
```shell
	export CUSTOM_MOD_LIST="jtsn-wm8960"
	make all_jetsonnano
```

### 3. Install driver
```shell
	sudo -E make install_jetsonnano
```

This file has been truncated. show original

(2) But instead of installing the “overlays/jetsonnano/jetson-seeed-2mic-wm8960.dtbo” , we installed “overlays/jetsonnano/jetson-seeed-2mic-voicecard.dtbo” in order to Enable the SPI1 port on 40-pin Header.

(3) Next we tried to control the APA102 LEDs based on instructions “4. Use the on-board APA102 LEDs” from the following wiki page “https://wiki.seeedstudio.com/ReSpeaker_2_Mics_Pi_HAT/” and we ran following commands:
sudo pip3 install spidev
cd ~/
git clone https://github.com/respeaker/mic_hat.git
cd mic_hat
python3 pixels.py

(4) But, LEDs don’t work as expected. LEDs remain off under most of the functions. But momentarily turn BLUE while executing “pixels.wakeup()”. We have tried to change the LED color values in script pixels.py, but LEDs either remain off or turn BLUE.

Have the LEDs been tested on Jetson-Nano? If yes, can you share the exact instructions which work fine.

Thanks & Regards,
A

PaintedSnipe · December 10, 2020, 11:03am

Hi,
We are wondering if LED issue is related to APA102 chip having 5V and 3.3V level-translator IC on Jetson board not able to driver SPI correctly. For this purpose we wanted to switch the APA102 power to 3.3V, by mounting the 3.3V resistor, and unmounting the 5V resistor. However, the PCB Layout available on the wiki page does not match with the layout of actual board. Can you share the update PCB Layout document please

Baozhu · December 11, 2020, 12:53am

@PaintedSnipe We really haven’t tested the APA102, but they are spi user driven and if you can get the SPI on the Jatson nano to work, it will work.

PaintedSnipe · December 11, 2020, 3:31am

Thanks @Baozhu . Will it possible for you to share the PCB layout pdf for the latest boards. The one available on following link does not match the hardware we have recently purchased

Thnaks,
PS

Baozhu · December 15, 2020, 12:33am

not match ? can you point out?