6699d4d4f9
Add driver that based on RPI-PICO's PIO feature for ws2812.
This driver can handle WS2812 or compatible LED strips.
The single PIO node can handle up to 4 strips.
Any pins that can be configured for PIO can be used for strips.
I verified the samples/driver/led_ws2812 sample
working with WS2812(144 pcs) led strip using following patches.
- samples/drivers/led_ws2812/boards/rpi_pico.overlay
```
/ {
aliases {
led-strip = &ws2812;
};
};
&pinctrl {
ws2812_pio0_default: ws2812_pio0_default {
ws2812 {
pinmux = <PIO0_P21>;
};
};
};
&pio0 {
status = "okay";
pio-ws2812 {
compatible = "worldsemi,ws2812-rpi_pico-pio";
status = "okay";
pinctrl-0 = <&ws2812_pio0_default>;
pinctrl-names = "default";
bit-waveform = <3>, <3>, <4>;
ws2812: ws2812 {
status = "okay";
output-pin = <21>;
chain-length = <144>;
color-mapping = <LED_COLOR_ID_GREEN
LED_COLOR_ID_RED
LED_COLOR_ID_BLUE>;
reset-delay = <280>;
frequency = <800000>;
};
};
};
```
- samples/drivers/led_ws2812/boards/rpi_pico.conf
```
CONFIG_WS2812_STRIP_RPI_PICO_PIO=y
```
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
# Copyright (c) 2017 Linaro Limited
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# Copyright (c) 2019 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: Apache-2.0
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# The following blog post is an excellent resource about pulse timing:
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#
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# https://wp.josh.com/2014/05/13/ws2812-neopixels-are-not-so-finicky-once-you-get-to-know-them/
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menuconfig WS2812_STRIP
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bool "WS2812 (and compatible) LED strip driver"
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help
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Enable LED strip driver for daisy chains of WS2812-ish (or WS2812B,
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WS2813, SK6812, Everlight B1414, or compatible) devices.
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choice WS2812_STRIP_DRIVER
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prompt "Driver backend"
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default WS2812_STRIP_SPI
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depends on WS2812_STRIP
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config WS2812_STRIP_SPI
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bool "SPI driver"
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depends on SPI
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help
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The SPI driver is portable, but requires significantly more
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memory (1 byte of overhead per bit of pixel data).
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config WS2812_STRIP_I2S
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bool "I2S driver"
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depends on I2S
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help
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Uses the I2S peripheral, memory usage is 4 bytes per color,
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times the number of pixels. A few more for the start and end
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delay. The reset delay has a coarse resolution of ~20us.
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config WS2812_STRIP_GPIO
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bool "GPIO driver"
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# Only an Cortex-M0 inline assembly implementation for the nRF51
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# is supported currently.
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depends on SOC_SERIES_NRF51X
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select LED_STRIP_RGB_SCRATCH
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help
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The GPIO driver does bit-banging with inline assembly,
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and is not available on all SoCs.
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Note that this driver is not compatible with the Everlight B1414
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controller.
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config WS2812_STRIP_RPI_PICO_PIO
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bool "Raspberry Pi Pico PIO"
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depends on DT_HAS_WORLDSEMI_WS2812_RPI_PICO_PIO_ENABLED
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select PICOSDK_USE_PIO
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help
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Use the PIO feature available on RaspberryPi Pico devices.
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endchoice
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