# -*- coding: utf-8 -*-
# Copyright (c) 2017 RS Components Ltd
# SPDX-License-Identifier: MIT License
"""
Interface for PmodISNS20 module (ADC7476 + Allegro ACS722).
"""
import spidev
CAP = 'SPI'
PHY = '1x6'
[docs]class PmodISNS20:
def __init__(self, DSPMod6):
self.port = DSPMod6
self.cs = self.port.pin1
self.nc = self.port.pin2
self.miso = self.port.pin3
self.sclk = self.port.pin4
self.spi = spidev.SpiDev()
self.__startSPI()
def __startSPI(self):
if self.cs == 7: #CE1
self.spi.open(0,1)
elif self.cs == 8: #CE0
self.spi.open(0,0)
else:
#throw exception here
return
self.spi.max_speed_hz = 100000
self.spi.mode = 0b00
def __stopSPI(self):
self.spi.close()
def __spiRead16(self):
resp = self.spi.xfer2([0x00, 0x00])
w = resp[0]
w <<= 8
w |= resp[1]
return w
[docs] def readAmps(self):
w = self.__spiRead16()
refV = 3.0
lsb = refV/4096
mV= (w-2048)*lsb*1000
amps = mV/66
return amps
[docs] def readMilliAmps(self):
return self.readAmps() * 1000
[docs] def cleanup(self):
self.__stopSPI()