HyperSPI

SPI bridge for AWA protocol to control a LED strip from HyperHDR (version v17 and above).
Diagnostic data available at the serial port output (@115200 speed).
Rpi acts as a master, ESP8266/ESP32 is in slave mode.

LED strip / Device	ESP8266	ESP32
SK6812 cold white	yes	yes
SK6812 neutral white	yes	yes
WS281x	yes	yes

Why this project was created?

• SPI is much faster. HyperSPI works best at speed over 20Mb.
• SPI doesn't have any data integration check. But AWA protocol does have one.
• you don't need to have 2Mb capable serial port on your ESP board.
• SPI transmission is much lighter than serial communication
• I needed it and I was able to implemented it 😉
• There is a hardware limitation for the Rpi current design...even if you connect your grabber to the USB3.0 in the USB2.0 mode the adalight running driver causes quite a big USB transfer drop. So we can replace Adalight with a pure SPI data transfer as an alternative.

See what's happening for USB2.0 bus... my problematic Ezcap 320 @ 50 fps fell back to USB2.0 mode and did not like the CH340G serial port driver at all (real USB3.0 should not be affected, but not tested it):

That's how the grabbers works when other device is disconnected from the USB port.

Software configuration (HyperHDR v17 and above)

In HyperHDR Image Processing→Smoothing→Update frequency you should do not exceed the maximum capacity of the device. Read more here: testing performance

Select esp8266 protocol for ESP proprietary SPI protocol, esp32 for ESP32 boards or 'standard' for other devices.
Make sure you set "Refresh time" to zero, "Baudrate" should be set to high but realistic value like 25 000 000.
Enabling "White channel calibration" is optional, if you want to fine tune the white channel balance of your sk6812 RGBW LED strip.

Hardware connection

If you are using an ESP board compatible with the Wemos board (ESP8266 Wemos D1/pro, ESP32 MH-ET Live, ESP32-S2 lolin mini), the SPI connection uses the same pinout location on the ESP board! The pin positions of the LED output may vary. Cables (including ground) should not exceed 15-20cm or it may be necessary to lower the SPI speed. See how easy it is to connect ESP to Rpi:

Default pinout: ESP8266 (can not be changed)

ESP8266	PINOUT
Clock (SCK)	GPIO 14
Data (MOSI)	GPIO 13
GROUND	mandatory
LED output	GPIO 2

Default pinout: ESP32 (can be changed)

ESP32	PINOUT
Clock (SCK)	GPIO 18
Data (MOSI)	GPIO 23
SPI Chip Select(e.g. CE0)	GPIO 5
GROUND	mandatory
LED output	GPIO 2

Default pinout: ESP32-S2 lolin mini (can be changed)

ESP32-S2 lolin mini	PINOUT
Clock (SCK)	GPIO 7
Data (MOSI)	GPIO 11
SPI Chip Select(e.g. CE0)	GPIO 12
GROUND	mandatory
LED output	GPIO 2

Flashing

There are two versions of the firmware for ESP32 and ESP32-S2. The 'factory' and the 'base' one. Factory firmware should be flashed to offset 0x0, base firmware to offset 0x10000.

ESP32-S2 Lolin mini:

Requires using esptool.py to flash the firmware e.g.

• esptool.py write_flash 0x10000 hyperspi_esp32_s2_mini_SK6812_RGBW_COLD.bin or
• esptool.py write_flash 0x0 hyperspi_esp32_s2_mini_SK6812_RGBW_COLD.factory.bin

Troubleshooting: ESP32-S2 Lolin mini recovery procedure if the board is not detected or is malfunctioning.

1. Put the board into dfu mode using board buttons: press Rst + 0 buttons, then release Rst, next release 0
   Do not reset or disconnect the board until the end of the recovery procedure.
2. Execute esptool.py erase_flash
3. Flash 'factory' version of the firmware e.g.
   esptool.py write_flash 0x0 hyperspi_esp32_s2_mini_SK6812_RGBW_COLD.factory.bin
4. Reset the board manually with the Rst button. The board should be detected as a COM port in the system.

Generic Esp8266/ESP32:

Recommend to use esphome-flasher

For RGBW LED strip like RGBW SK6812 NEUTRAL white choose: hyperspi_..._SK6812_RGBW_NEUTRAL.bin

For RGBW LED strip like RGBW SK6812 COLD white choose: hyperspi_..._SK6812_RGBW_COLD.bin

For RGB LED strip like WS8212b or RGB SK6812 variant choose: hyperspi_..._WS281x_RGB.bin

If you want to disable your first LED because it's used as a sacrificial level shifter, please use HyperHDR v19

For the RGBW firmware the white channel is automatically calculated and R,G,B channels are corrected.

Benchmark results

ESP32 & ESP32-S2 parallel multi-segment mode

LED strip / Device	ESP32 MH-ET LIVE mini HyperSPI v9	ESP32-S2 Lolin mini HyperSPI v9
300LEDs sk6812 Refresh rate/continues output=100Hz SECOND_SEGMENT_START_INDEX=150	100	100
600LEDs sk6812 Refresh rate/continues output=83Hz SECOND_SEGMENT_START_INDEX=300	83	83
900LEDs sk6812 Refresh rate/continues output=55Hz SECOND_SEGMENT_START_INDEX=450	54-55	55

ESP32

LED strip / Device	ESP32 MH ET Live HyperSPI v9
300LEDs RGBW Refresh rate/continues output=83Hz	83
600LEDs RGBW Refresh rate/continues output=43Hz	42-43
900LEDs RGBW Refresh rate/continues output=28Hz	28

ESP32-S2

LED strip / Device	ESP32-S2 Lolin mini HyperSPI v9
300LEDs RGBW Refresh rate/continues output=83Hz	83
600LEDs RGBW Refresh rate/continues output=43Hz	42
900LEDs RGBW Refresh rate/continues output=28Hz	28

ESP8266

LED strip / Device	ESP8266 Wemos D1 Pro HyperSPI v9
300LEDs RGBW Refresh rate/continues output=70Hz	70
600LEDs RGBW Refresh rate/continues output=33Hz	33
900LEDs RGBW Refresh rate/continues output=22Hz	22

Example of supported boards

Esp8266 Wemos D1 mini (CH340) and Wemos D1 mini pro (CP2104)

ESP32 MH-ET Live and ESP32-S2 Lolin mini (CDC)

Compiling

Currently we use PlatformIO to compile the project. Install Visual Studio Code and add PlatformIO plugin. This environment will take care of everything and compile the firmware for you. Low-level LED strip support is provided by my highly optimizated (pre-fill I2S DMA modes, turbo I2S parallel mode for up to 2 segments etc) version of Neopixelbus library: link.

But there is also an alternative and an easier way. Just fork the project and enable its Github Action. Use the online editor to make changes to the platformio.ini file, for example change default pin-outs or enable multi-segments support, and save it. Github Action will compile new firmware automatically in the Artifacts archive. It has never been so easy!

Tutorial: https://github.com/awawa-dev/HyperSPI/wiki

Multi-Segment Wiring (ESP32 and ESP32-S2 only)

Using parallel multi-segment allows you to double your Neopixel (e.g. sk6812 RGBW) LED strip refresh rate by dividing it into two smaller equal parts. Both smaller segments are perfectly in sync so you don't need to worry about it. Proposed example of building a multisegment:

• Divide a long or dense strip of LEDs into 2 smaller equal parts. So SECOND_SEGMENT_START_INDEX in the HyperSPI firmware is the total number of LEDs divided by 2.
• Build your first segment traditional way e.g. clockwise, so it starts somewhere in middle of the bottom of frame/TV and ends in the middle of the top of frame/TV
• Start the second segment in the opposite direction to the first one e.g. counterclockwise (SECOND_SEGMENT_REVERSED option in the HyperSPI firmware configuration must be enabled). So it starts somewhere in the middle of the bottom of the frame/TV and ends in the middle of the top of the TV/frame. Both segments could be connected if possible at the top but only 5v and ground ( NOT the data line).
• The data line starts for both segments somewhere in the middle of the bottom of the TV/frame (where each of the LED strips starts)
• Configuration in HyperHDR does not change! It's should be configured as one, single continues segment. All is done in HyperSPI firmware transparently and does not affect LED strip configuration in HyperHDR.

You also must configure data pin in the platformio.ini. Review the comments at the top of the file:

• SECOND_SEGMENT_DATA_PIN - These is data pin for your second strip

You add these to your board's config. Be sure to put -D in front of each setting.

Examples of final build_flags for 288 LEDs divided into 2 equal segments in the platformio.ini:

[env:SK6812_RGBW_COLD]
build_flags = -DNEOPIXEL_RGBW -DCOLD_WHITE -DDATA_PIN=2 ${env.build_flags} -DSECOND_SEGMENT_START_INDEX=144 -DSECOND_SEGMENT_DATA_PIN=4 -DSECOND_SEGMENT_REVERSED
...
[env:WS281x_RGB]
build_flags = -DNEOPIXEL_RGB -DDATA_PIN=2 ${env.build_flags} -DSECOND_SEGMENT_START_INDEX=144 -DSECOND_SEGMENT_DATA_PIN=4 -DSECOND_SEGMENT_REVERSED
...

Implementation example:

• The diagram of the board for WS2812b/SK6812 including ESP32 and the SN74AHCT125N 74AHCT125 level shifter.

Performance output

The output is only available when HyperHDR is not using the device at the moment, so it should be disabled in the app for a while. Stores the last result when HyperHDR was running in the current session. You can read it from the serial port at a speed of 115200.

For testing maximum performance in HyperHDR enable Image Processing→Smoothing→Continuous output, high Update frequency in the same tab and set any color in the Remote control tab as an active effect. After testing you need to disable Continuous outputand set Update frequency according to your results.