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mp_ws2812 [2021/10/06 02:10] gongyusu |
mp_ws2812 [2021/10/16 15:29] (当前版本) gongyusu [1. 连线图] |
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| - [[https://makersportal.com/blog/ws2812-ring-light-with-raspberry-pi-pico|ws2812的控制]] | - [[https://makersportal.com/blog/ws2812-ring-light-with-raspberry-pi-pico|ws2812的控制]] | ||
| - [[https://github.com/makerportal/rpi-pico-ws2812|Github上的资源整理]] | - [[https://github.com/makerportal/rpi-pico-ws2812|Github上的资源整理]] | ||
| + | {{ :ws2812timing.png |}} | ||
| + | |||
| + | |||
| + | ### WS2812B教程内容 | ||
| + | [[mp_ws2812b|]] | ||
| 行 17: | 行 22: | ||
| - GND GND | - GND GND | ||
| Most of the GPIO pins can be used to control the WS2812 LED array, thus, the specification of GPIO13 for controlling the light is arbitrary. Be sure to change the pin in the codes as well, if using another pin for wiring. | Most of the GPIO pins can be used to control the WS2812 LED array, thus, the specification of GPIO13 for controlling the light is arbitrary. Be sure to change the pin in the codes as well, if using another pin for wiring. | ||
| + | {{::WS2812_Pin.png|}} | ||
| - | + | ### 2. ws2812的使用示例 | |
| - | ### 2. MicroPython状态机 | + | |
| The 16-Pixel RGB LED ring light array will be controlled using the scheme outlined in the Raspberry Pi Pico MicroPython getting started document, where we can get started with the tutorial entitled “Using PIO to drive a set of NeoPixel Ring (WS2812 LEDs).” The tutorial contains a script that will be used to create a state machine on the RPi Pico. The state machine will be used to control the LEDs on the ring light using a single pin on the Pico (GPIO13 in the wiring above). The full MicroPython example script can also be found at the Raspberry Pi Pico’s NeoPixel Ring repository. | The 16-Pixel RGB LED ring light array will be controlled using the scheme outlined in the Raspberry Pi Pico MicroPython getting started document, where we can get started with the tutorial entitled “Using PIO to drive a set of NeoPixel Ring (WS2812 LEDs).” The tutorial contains a script that will be used to create a state machine on the RPi Pico. The state machine will be used to control the LEDs on the ring light using a single pin on the Pico (GPIO13 in the wiring above). The full MicroPython example script can also be found at the Raspberry Pi Pico’s NeoPixel Ring repository. | ||
| The code to start the state machine on the Pico's GPIO pin #20 is given below: | The code to start the state machine on the Pico's GPIO pin #20 is given below: | ||
| - | |||
| - | <code python> | ||
| - | import array, time | ||
| - | from machine import Pin | ||
| - | import rp2 | ||
| - | |||
| - | # | ||
| - | ############################################ | ||
| - | # RP2040 PIO and Pin Configurations | ||
| - | ############################################ | ||
| - | # | ||
| - | # WS2812 LED Ring Configuration | ||
| - | led_count = 16 # number of LEDs in ring light | ||
| - | PIN_NUM = 13 # pin connected to ring light | ||
| - | brightness = 0.5 # 0.1 = darker, 1.0 = brightest | ||
| - | |||
| - | @rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, | ||
| - | autopull=True, pull_thresh=24) # PIO configuration | ||
| - | |||
| - | # define WS2812 parameters | ||
| - | def ws2812(): | ||
| - | T1 = 2 | ||
| - | T2 = 5 | ||
| - | T3 = 3 | ||
| - | wrap_target() | ||
| - | label("bitloop") | ||
| - | out(x, 1) .side(0) [T3 - 1] | ||
| - | jmp(not_x, "do_zero") .side(1) [T1 - 1] | ||
| - | jmp("bitloop") .side(1) [T2 - 1] | ||
| - | label("do_zero") | ||
| - | nop() .side(0) [T2 - 1] | ||
| - | wrap() | ||
| - | |||
| - | |||
| - | # Create the StateMachine with the ws2812 program, outputting on pre-defined pin | ||
| - | # at the 8MHz frequency | ||
| - | state_mach = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(PIN_NUM)) | ||
| - | |||
| - | # Activate the state machine | ||
| - | state_mach.active(1) | ||
| - | |||
| - | </code> | ||
| - | |||
| - | The snippet of code given above will be used for each algorithm used to test the 16-pixel WS2812 LED ring light. | ||
| - | |||
| - | ### 3. ws2812的使用示例 | ||
| <code python> | <code python> | ||
| # Example using PIO to drive a set of WS2812 LEDs. | # Example using PIO to drive a set of WS2812 LEDs. | ||