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MCP3202.py
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MCP3202.py
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#!/usr/bin/python
import RPi.GPIO as GPIO
import time
import datetime
import os
from time import strftime
CS = 4
CS2 = 7
CLK = 11
MOSI = 10
MISO = 9
LDAC = 8
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(CS, GPIO.OUT)
GPIO.setup(CLK, GPIO.OUT)
GPIO.setup(MOSI, GPIO.OUT)
GPIO.setup(CS2, GPIO.OUT)
GPIO.setup(LDAC, GPIO.OUT)
GPIO.setup(MISO, GPIO.IN,pull_up_down = GPIO.PUD_UP)
GPIO.output(CS, True)
GPIO.output(CLK, False)
GPIO.output(MOSI, True)
def myspi(rdata):
dataX = 0
mask = 0x80
for i in range(8):
if(rdata & mask):
GPIO.output(MOSI, True)
else:
GPIO.output(MOSI, False)
GPIO.output(CLK, True)
if(GPIO.input(MISO) == 1):
dataX = dataX + mask
GPIO.output(CLK, False)
mask = mask >> 1
return dataX;
def readADC(ch):
cmd = 0
if ch == 0: cmd = 0x80
elif ch == 1: cmd = 0xc0
#elif ch == 2: cmd = 0x00
#elif ch == 4: cmd = 0x04
GPIO.output(CS, False)
a = myspi(0x01)
#print "a: ",a
b = myspi(cmd)
#print "b: ",b
c = myspi(0x00)
#print "c: ",c
v = ((b & 0x0f) << 8) + c
#print "v: ",v
GPIO.output(CS, True)
v = round(float(v), 2)
#v=round(float(v)/4095*3.3,2)
return v;
def setDAC(data, channel):
cmd = 0
if channel == 1: cmd = 0xF0
else: cmd = 0x70
GPIO.output(LDAC,False)
GPIO.output(CS2,False)
data = int(float(data * 4095 / 255))
a = myspi((data >> 8) + cmd)
b = myspi(data & 0xFF)
GPIO.output(CS2, True)
return;