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nixietube.py
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nixietube.py
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from microbit import *
from enum import *
TM1637_CMD1 = 64 # 0x40 data command
TM1637_CMD2 = 192 # 0xC0 address command
TM1637_CMD3 = 128 # 0x80 display control command
_SEGMENTS = (0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71)
class NIXIETUBE(object):
"""基本描述
7段4位数码管, 7-Seg LED Nixie tube
"""
def __init__(self, RJ_pin, intensity=7, number=4):
if RJ_pin == J1:
self.__clk = pin1
self.__dio = pin8
elif RJ_pin == J2:
self.__clk = pin2
self.__dio = pin12
elif RJ_pin == J3:
self.__clk = pin13
self.__dio = pin14
elif RJ_pin == J4:
self.__clk = pin15
self.__dio = pin16
self.__intensity = intensity % 8
self.__LED = number
self.__ON = 8
self.__buf_d = [0, 0, 0, 0]
self.__clk.write_digital(0)
self.__dio.write_digital(0)
self.set_clear()
def __start(self):
self.__dio.write_digital(0)
self.__clk.write_digital(0)
def __stop(self):
self.__dio.write_digital(0)
self.__clk.write_digital(1)
self.__dio.write_digital(1)
def __write_data_cmd(self):
self.__start()
self.__write_byte(TM1637_CMD1)
self.__stop()
def __write_dsp_ctrl(self):
self.__start()
self.__write_byte(TM1637_CMD3 | self.__ON | self.__intensity)
self.__stop()
def __write_byte(self, b):
for i in range(8):
self.__dio.write_digital((b >> i) & 1)
self.__clk.write_digital(1)
self.__clk.write_digital(0)
self.__clk.write_digital(1)
self.__clk.write_digital(0)
def __dat(self, bit, dat):
self.__write_data_cmd()
self.__start()
self.__write_byte(TM1637_CMD2 | (bit % self.__LED))
self.__write_byte(dat)
self.__stop()
self.__write_dsp_ctrl()
def set_power_on(self):
"""
数码管点亮显示，默认点亮
"""
self.__ON = 8
self.__write_data_cmd()
self.__write_dsp_ctrl()
def set_power_off(self):
"""
数码管熄灭
"""
self.__ON = 0
self.__write_data_cmd()
self.__write_dsp_ctrl()
def set_intensity(self, val=None):
"""
设置数码管显示亮度
Args:
val (number): 亮度 0-8
"""
if val is None:
return self.__intensity
val = max(0, min(val, 8))
if val == 0:
self.set_power_off()
else:
self.__ON = 8
self.__intensity = val - 1
self.__write_data_cmd()
self.__write_dsp_ctrl()
def set_clear(self):
"""
清空数码管显示内容
"""
self.__dat(0, 0)
self.__dat(1, 0)
self.__dat(2, 0)
self.__dat(3, 0)
self.__buf_d = [0, 0, 0, 0]
def set_show_bit(self, num, bit=0):
"""
在指定位置显示单个数字
Args:
bit (number): 小数点位置 0-4
num (number): 要显示的数字0-9
"""
self.__buf_d[bit % self.__LED] = _SEGMENTS[num % 16]
self.__dat(bit, _SEGMENTS[num % 16])
def set_show_DP(self, bit=1, show=True):
"""
显示一个4小数点
Args:
bit (number): 小数点位置 0-4
show (bool): 显示控制位 Ture显示 False不显示
"""
bit = bit % self.__LED
if show:
self.__dat(bit, self.__buf_d[bit] | 0x80)
else:
self.__dat(bit, self.__buf_d[bit] & 0x7F)
def set_show_num(self, num):
"""
显示一个4位数字
Args:
num (number): 要显示的数字 -999——9999
"""
if num < 0:
self.__dat(0, 0x40) # '-'
num = -num
else:
self.set_show_bit((num // 1000) % 10)
self.set_show_bit(num % 10, 3)
self.set_show_bit((num // 10) % 10, 2)
self.set_show_bit((num // 100) % 10, 1)
if __name__ == '__main__':
tm = NIXIETUBE(J2)
n = 0
while 1:
tm.set_show_num(n)
n += 1