djacobow / pipowermeter Goto Github PK

	# to communicate with the ic 
        # RW is 1 / 0 for read or write operation 
        # address as the name suggests points to a specific register
        # val is the value to be written during write operation
        def comm_atm90(self,RW,address,val): 
		#switch MSB and LSB of value
		buf = bytearray(2)
		#Set read write flag
		address|=RW<<7
		self.spi.open(0,0)
                self.spi.max_speed_hz = 200000
                self.spi.mode = 0b11
                self.spi.lsbfirst = False
                self.spi.bits_per_word = 8
		time.sleep(0.000010)
		self.spi.writebytes([address])
		''' Must wait 4 us for data to become valid '''
		time.sleep(0.000004)

		#Read data
		#Do for each byte in transfer
		if(RW):
			buf = self.spi.readbytes(2)
		else:
			self.spi.writebytes([val])			 # write all the bytes
		self.spi.close()
		return int.from_bytes(buf,'big')

import spidev
spi = spidev.SpiDev()

# lets say after the init functions i call the checksum 1 register
print(hex(self.comm_atm90(True,CSOne,0x0000)))