133 lines
5.1 KiB
Python
133 lines
5.1 KiB
Python
import wiringpi
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import argparse
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import time
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parser = argparse.ArgumentParser(description='')
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parser.add_argument("--channel", type=int, default=1, help='specify the spi channel')
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parser.add_argument("--port", type=int, default=0, help='specify the spi port')
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parser.add_argument("--speed", type=int, default=6400000, help='specify the spi speed')
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parser.add_argument("--mode", type=int, default=0, help='specify the spi mode')
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args = parser.parse_args()
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# 0码 t0H 220ns~380ns
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#（python 中GPIO口无法翻转这么快，python 可能执行一行代码需要800ns）
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# 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)
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# 方案1.
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# 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：
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# 1111 1000 0xF8 #1码 高电平时间长，低电平时间短
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# 1100 0000 0xC0 #0码 高电平时间短，低电平时间长
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# 则得出SPI 波特率应该设置为800K*8
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# 方案2. 见led_bak.py
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# 使用SPI产生ws2812时序，产生1码和0码，则可以使用传输一个半个byte 来代表一个0码或者1码，如下：
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# 1100 0x0c #1码 高电平时间长，低电平时间短
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# 1000 0x08 #0码 高电平时间短，低电平时间长
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# 则得出SPI 波特率应该设置为800K*4
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sig_1 = 0xf8
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sig_0 = 0xc0
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def flatten_arrays(arrays):
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return [element for sublist in arrays for element in sublist]
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class WS2812:
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def __init__(self, led_num=10):
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self.led_num = led_num
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self.ws2812_data = [[sig_0 for _ in range(24)] for _ in range(led_num)]
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wiringpi.wiringPiSPISetupMode(args.channel, args.port, args.speed, args.mode)
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# 设置一下下拉，否则第一盏灯的时序可能不正确
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wiringpi.wiringPiSetup()
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wiringpi.pullUpDnControl(11, 1)
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print("ws2812_data len", len(self.ws2812_data))
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print("spi mode: 0x%x" % args.mode)
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print("max speed: %d Hz (%d KHz)\n" % (args.speed, args.speed / 1000), end='')
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def ws2812_send_data(self):
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default_tx = self.ws2812_data
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wiringpi.wiringPiSPIDataRW(args.channel, bytes(flatten_arrays(default_tx)))
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def ws2812_light_led(self, red, green, blue, pix_led):
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default_tx = self.ws2812_data
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color = green << 16 | red << 8 | blue
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for i in range(24):
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if color >> (24 - i - 1) & 1:
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default_tx[pix_led][i] = sig_1
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else:
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default_tx[pix_led][i] = sig_0
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def ws2812_light_one_led(self, red, green, blue, pix_led):
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self.ws2812_light_led(red, green, blue, pix_led)
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self.ws2812_send_data()
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def ws2812_light_all_led(self, red, green, blue):
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for i in range(self.led_num):
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self.ws2812_light_led(red, green, blue, i)
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self.ws2812_send_data()
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def ws2812_rainbow(self):
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colors = [[0xff, 0, 0], [0, 0xff, 0], [0, 0, 0xff]]
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for i in range(self.led_num):
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cur_color = colors[i % 3]
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self.ws2812_light_led(cur_color[0], cur_color[1], cur_color[2], i)
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self.ws2812_send_data()
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def ws2812_water_lamp(self, red, green, blue, interval_time):
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self.ws2812_shutoff_all()
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for i in range(self.led_num):
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self.ws2812_light_one_led(red, green, blue, i)
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time.sleep(interval_time)
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self.ws2812_shutoff_all()
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def ws2812_shutoff_led(self, n):
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self.ws2812_light_led(0, 0, 0, n)
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self.ws2812_send_data()
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def ws2812_shutoff_all(self):
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for i in range(self.led_num):
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self.ws2812_light_led(0, 0, 0, i)
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self.ws2812_send_data()
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def ws2812_gradient_run(self, start_red, start_green, start_blue, end_red, end_green, end_blue, steps, delay):
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for step in range(steps):
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# 计算当前步的颜色
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curr_red = start_red + (end_red - start_red) * step // steps
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curr_green = start_green + (end_green - start_green) * step // steps
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curr_blue = start_blue + (end_blue - start_blue) * step // steps
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# 清除当前颜色并应用新的渐变色
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self.ws2812_shutoff_all()
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for i in range(self.led_num):
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self.ws2812_light_led(curr_red, curr_green, curr_blue, (i + step) % self.led_num) # 循环显示渐变色
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self.ws2812_send_data()
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time.sleep(delay)
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if __name__ == '__main__':
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ws2812 = WS2812(8)
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while True:
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# 示例：从蓝色渐变到红色，再从红色渐变回蓝色，每种颜色渐变10步，每步间隔0.1秒
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ws2812.ws2812_gradient_run(0, 0, 0xff, 0xff, 0, 0, 10, 0.02)
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time.sleep(1) # 等待1秒后开始反向渐变
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ws2812.ws2812_gradient_run(0xff, 0, 0, 0, 0, 0xff, 10, 0.02)
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time.sleep(1) # 再次等待1秒，形成完整的循环
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ws2812.ws2812_light_all_led(0, 0, 0xff)
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time.sleep(0.5)
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ws2812.ws2812_light_all_led(0xff, 0, 0)
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time.sleep(0.5)
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ws2812.ws2812_light_all_led(0, 0xff, 0)
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time.sleep(0.5)
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ws2812.ws2812_shutoff_all()
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time.sleep(0.5)
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ws2812.ws2812_water_lamp(0xff, 0, 0, 0.2)
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time.sleep(0.5) |