98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
import time
|
||
import spidev
|
||
import wiringpi
|
||
|
||
# 0码 t0H 220ns~380ns
|
||
# （python 中GPIO口无法翻转这么快，python 可能执行一行代码需要800ns）
|
||
# ws2812 波特率如果设置为800kHZ, 1/0.8M=1.25us (0码或者1码所需要的时间)
|
||
|
||
# 使用SPI产生ws2812时序，产生1码和0码，则可以使用传输一个byte 来代表一个0码或者1码，如下：
|
||
# 1111 1000 0xF8 #1码 高电平时间长，低电平时间短
|
||
# 1100 0000 0xC0 #0码 高电平时间短，低电平时间长
|
||
# 则得出SPI 波特率应该设置为800K*8
|
||
|
||
sig_1 = 0xf8
|
||
sig_0 = 0xc0
|
||
|
||
|
||
def flatten_arrays(arrays):
|
||
return [element for sublist in arrays for element in sublist]
|
||
|
||
|
||
class WS2812:
|
||
def __init__(self, led_num=1):
|
||
self.led_num = led_num
|
||
self.ws2812_data = [[sig_0 for _ in range(24)] for _ in range(led_num)]
|
||
spi = spidev.SpiDev()
|
||
|
||
# 设置一下下拉，否则第一盏灯的时序可能不正确
|
||
wiringpi.wiringPiSetup()
|
||
wiringpi.pullUpDnControl(11, 1)
|
||
spi.open(0, 0)
|
||
spi.max_speed_hz = 6400000
|
||
spi.mode = 0
|
||
|
||
self.spi = spi
|
||
|
||
def ws2812_send_data(self):
|
||
default_tx = self.ws2812_data
|
||
self.spi.xfer2(bytes(flatten_arrays(default_tx)))
|
||
|
||
def ws2812_light_led(self, red, green, blue, pix_led):
|
||
default_tx = self.ws2812_data
|
||
color = green << 16 | red << 8 | blue
|
||
for i in range(24):
|
||
if color >> (24 - i - 1) & 1:
|
||
default_tx[pix_led][i] = sig_1
|
||
else:
|
||
default_tx[pix_led][i] = sig_0
|
||
|
||
def ws2812_light_one_led(self, red, green, blue, pix_led):
|
||
self.ws2812_light_led(red, green, blue, pix_led)
|
||
self.ws2812_send_data()
|
||
|
||
def ws2812_light_all_led(self, red, green, blue):
|
||
for i in range(self.led_num):
|
||
self.ws2812_light_led(red, green, blue, i)
|
||
|
||
self.ws2812_send_data()
|
||
|
||
def ws2812_rainbow(self):
|
||
colors = [[0xff, 0, 0], [0, 0xff, 0], [0, 0, 0xff]]
|
||
for i in range(self.led_num):
|
||
cur_color = colors[i % 3]
|
||
self.ws2812_light_led(cur_color[0], cur_color[1], cur_color[2], i)
|
||
self.ws2812_send_data()
|
||
|
||
def ws2812_water_lamp(self, red, green, blue, interval_time):
|
||
self.ws2812_shutoff_all()
|
||
|
||
for i in range(self.led_num):
|
||
self.ws2812_light_one_led(red, green, blue, i)
|
||
time.sleep(interval_time)
|
||
|
||
self.ws2812_shutoff_all()
|
||
|
||
def ws2812_shutoff_led(self, n):
|
||
self.ws2812_light_led(0, 0, 0, n)
|
||
self.ws2812_send_data()
|
||
|
||
def ws2812_shutoff_all(self):
|
||
for i in range(self.led_num):
|
||
self.ws2812_light_led(0, 0, 0, i)
|
||
|
||
self.ws2812_send_data()
|
||
|
||
|
||
if __name__ == '__main__':
|
||
ws2812 = WS2812(8)
|
||
|
||
while True:
|
||
ws2812.ws2812_light_all_led(0, 0, 0xff)
|
||
time.sleep(0.5)
|
||
ws2812.ws2812_light_all_led(0xff, 0, 0)
|
||
time.sleep(0.5)
|
||
ws2812.ws2812_light_all_led(0, 0xff, 0)
|
||
time.sleep(0.5)
|
||
# ws2812.ws2812_water_lamp(0xff, 0, 0, 0.2)
|
||
# time.sleep(0.5) |