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I am trying to run Zephyr sample ./zephyr/samples/drivers/led_ws2812/README.rst on chipset ESP32c3.
After some tuning of this example, I am able to run it, diodes starts to flash one by one, but they never turn off all. Anytime I start the microcontroller, 3 diodes keep shining, they do change color but there is always certaing brightness offset I cannot get rid of, moreover I tried to turn all the diodes off, but no luck.
In contrast, the same example runs pretty fine on nrf52840_dongle, could anyone help me tweak this example for RISCV?
I guess it has something to do with these 3 items in dts overlay which need to be fine tuned for specific hardware platform,according to this page:
- spi-max-frequency - spi-zero-frame - spi-one-frame.But how can I get to know these parameters? For nrf52840 they are already included, but for esp32c3 I guess they must be calculated.
Could anyone give me a hint how to proceed further?
Hi:toggle quoted message Show quoted text
The following blog post is an excellent resource about pulse timing:
You'll need to hook up a logic analyzer or scope to the data pin and
check the pulses to debug once you understand the protocol.
On Sun, Feb 05 2023, Ivo via lists zephyrproject org wrote:
toggle quoted message Show quoted text
The best way I've thought of neopixel (aka ws2812) timing is that its a 800 khz signal with 1/3 and 2/3 duty cycle.
On ESP chips, the RMT peripheral is generally the best way to produce it. Here is non-Zephyr code from CircuitPython: https://github.com/adafruit/circuitpython/blob/main/ports/espressif/common-hal/neopixel_write/__init__.c
On Wed, Feb 8, 2023 at 7:56 AM Bolivar, Marti via lists.zephyrproject.org <marti.bolivar=nordicsemi.no@...> wrote:
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