Raspberry Pi Forums

Code: Select all

  //setup i2c to mod-tc on 0x23
  if((fd = wiringPiI2CSetup(0x23)) < 0) {
    printf("I2CSetup Failed, %i\n", fd);
  }

  // GET_TEMP
  wiringPiI2CWrite(fd, 0x21);
  read(fd, temp, 4);

Code: Select all

import RPi.GPIO as GPIO

#####################
#      SETUP        #
#####################

#set up GPIO using BCM numbering
GPIO.setmode(GPIO.BCM)
# setup dataready GPIO 
GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)

#####################
#     FUNCTIONS     #
#####################

def clk(value):
 if (value):
  GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 else:
  GPIO.setup(22, GPIO.OUT, pull_up_down=GPIO.PUD_UP)
  GPIO.output( 22, False) 
 return

def data(value):
 if (value):
  GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 else:
  GPIO.setup(23, GPIO.OUT, pull_up_down=GPIO.PUD_UP)
  GPIO.output( 23, False) 
 return

def datard():
 return(GPIO.input(23) == 1)
  
def StartBus():
 clk(True)
 data(True)
 data(False)

def StopBus():
 clk(True)
 data(False)
 data(True)

def WriteByte(x):
#bit 0
 clk(False)
 data((x&128 != 0))
 clk(True)
#bit 1
 clk(False)
 data((x&64 != 0))
 clk(True)
#bit 2
 clk(False)
 data((x&32 != 0))
 clk(True)
#bit 3
 clk(False)
 data((x&16 != 0))
 clk(True)
#bit 4
 clk(False)
 data((x&8 != 0))
 clk(True)
#bit 5
 clk(False)
 data((x&4 != 0))
 clk(True)
#bit 6
 clk(False)
 data((x&2 != 0))
 clk(True)
#bit 7
 clk(False)
 data((x&1 != 0))
 clk(True)
#ack
 clk(False)
 data(True)
 clk(True)
 clk(False)    

def ReadByte():
 x=0
 data(True);
#bit 0
 clk(False)
 clk(True)
 if (datard()):
  x=x+128
#bit 1
 clk(False)
 clk(True)
 if (datard()):
  x=x+64
#bit 2
 clk(False)
 clk(True)
 if (datard()):
  x=x+32
#bit 3
 clk(False)
 clk(True)
 if (datard()):
  x=x+16
#bit 4
 clk(False)
 clk(True)
 if (datard()):
  x=x+8
#bit 5
 clk(False)
 clk(True)
 if (datard()):
  x=x+4
#bit 6
 clk(False)
 clk(True)
 if (datard()):
  x=x+2
#bit 7
 clk(False)
 clk(True)
 if (datard()):
  x=x+1
#ack
 clk(False)
 data(False)
 clk(True)
 clk(False)   
 return x
  
 

#####################
#      MAIN         #
#####################

#StartBus()
#WriteByte(0xA1)
#b1=ReadByte()
#b2=ReadByte()
#StopBus()
#print("0x%02X" % b1)
#print("0x%02X" % b2)