198aadfc0a
19424: drivers/ws281x: add RMT hardware support for ESP32x SoCs r=maribu a=gschorcht ### Contribution description This PR provides support for ESP32x RMT that is used to generate WS2812B signals. All ESP32x SoCs have a [Remote Control Peripheral (RMT)](https://docs.espressif.com/projects/esp-idf/en/v4.4.4/esp32/api-reference/peripherals/rmt.html) that can be used to generate digital waveforms, such as NEC remote control signals or WS2812B RGB LED signals. Each RMT peripheral has either 4 or 8 channels. Some ESP32x SoCs support configuring the clock sources used for each channel separately, while other ESP32x SoCs can only use a single clock source for all channels. The advantages using the RMT are that the CPU is not busy when generating the WS218x signal and the phase times are accurate to nanoseconds. The disadvantage is that the configuration of the RMT is so complex due to its flexibility that the [ESP-IDF high-level driver for RMT](https://docs.espressif.com/projects/esp-idf/en/v4.4.4/esp32c3/api-reference/peripherals/rmt.html) is used.This requires about 6 kBytes more ROM, about 3 kBytes more IRAM, and 88 bytes more RAM. Therefore, either the RMT hardware implementation (module `ws2812x_esp32_hw`) as well as the bit-banging software implementation (module `ws2812x_esp32_hw`) can be used. RMT hardware implementation (module `ws2812x_esp32_hw`) is used by default. Timing with hardware implementation:  ### Testing procedure `tests/driver_ws281x` should still work, for example: ``` CFLAGS='-DWS281X_PARAM_PIN=GPIO45 -DWS281X_PARAM_NUMOF=47' BOARD=esp32s3-devkit make -j8 -C tests/driver_ws281x flash ``` Test Output: https://user-images.githubusercontent.com/31932013/227791753-e6d2924e-3364-4387-870f-a56d3a9a8a80.mp4 ### Issues/PRs references Co-authored-by: Gunar Schorcht <gunar@schorcht.net> |
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| CODING_CONVENTIONS_C++.md | ||
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| doc.txt | ||
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The friendly Operating System for IoT!
RIOT is a real-time multi-threading operating system that supports a range of devices that are typically found in the Internet of Things (IoT): 8-bit, 16-bit and 32-bit microcontrollers.
RIOT is based on the following design principles: energy-efficiency, real-time capabilities, small memory footprint, modularity, and uniform API access, independent of the underlying hardware (this API offers partial POSIX compliance).
RIOT is developed by an international open source community which is independent of specific vendors (e.g. similarly to the Linux community). RIOT is licensed with LGPLv2.1, a copyleft license which fosters indirect business models around the free open-source software platform provided by RIOT, e.g. it is possible to link closed-source code with the LGPL code.
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