初始化提交

boards/default_src/micropython/origin/build/lib/tm1931.py

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+"""
+TM1931-
+
+Micropython	library for the TM1931 (18 channel IO port extension)
+=======================================================
+
+#Preliminary composition	  	    			20220614
+
+dahanzimin From the Mixly Team
+"""
+
+import time
+import framebuf
+from machine import UART
+from micropython import const
+
+_TM1931_ADDRESS			= const(0x54)
+_TM1931_REG_SSD			= const(0x00)		
+_TM1931_REG_UPD			= const(0x16)		
+_TM1931_REG_RST		    = const(0x17)      
+
+class TM1931:
+	def __init__(self, i2c_bus, addr=_TM1931_ADDRESS):
+		self._i2c=i2c_bus
+		self._addr = addr
+		self._duty = bytearray(18)	
+		self.reset()
+		
+	def _wreg(self, reg, val):
+		'''Write memory address'''
+		self._i2c.writeto_mem(self._addr,reg,val.to_bytes(1, 'little'))
+	
+	def _rreg(self, reg,nbytes=1):
+		'''Read memory address'''
+		return  self._i2c.readfrom_mem(self._addr, reg, nbytes)[0] if nbytes<=1 else self._i2c.readfrom_mem(self._addr, reg, nbytes)[0:nbytes]
+
+	def work(self,start=True):
+		"""Start and open all output channels"""
+		self._wreg(_TM1931_REG_SSD,0x01& start)
+		start=0xff if start else 0
+		for i in range(0x13,0x16,1):
+			self._wreg(i,start)
+
+	def update(self):
+		"""Load PWM register and LED control register data"""
+		self._wreg(_TM1931_REG_UPD,0xff)
+	
+	def reset(self):
+		"""Reset all registers to default state"""
+		self._wreg(_TM1931_REG_RST,0x00)
+		self.work(True)
+
+	def duty(self,index):
+		"""Obtain PWM duty cycle"""
+		if not 1 <= index <= 18:
+			raise ValueError("Port must be a number in the range: 1-18")
+		return self._duty[index-1]
+ 
+	def pwm(self,index,duty):
+		"""18 channel PWM duty cycle data register"""
+		if not 0 <= duty <= 255:
+			raise ValueError("Duty must be a number in the range: 0-255")
+		if not 1 <= index <= 18:
+			raise ValueError("Port must be a number in the range: 1-18")
+		self._duty[index-1]	= duty
+		self._wreg(index,duty)
+		self.update()