Page 8 of 13
Page 151
import subprocess
import spidev
from time import sleep
def checkSPI():
temp = subprocess.Popen(["sudo", "dtparam", "-l"], stdout=subprocess.PIPE)
output = str(temp.communicate())
lastSPI = output.rfind("spi")
if lastSPI != -1:
lastSPI = output.find("spi=on", lastSPI)
if lastSPI == -1:
temp = subprocess.Popen(
["sudo", "dtparam", "spi=on"], stdout=subprocess.PIPE)
output = str(temp.communicate())
checkSPI()
spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 5000
Data = [0xAA]
print(hex(Data[0]))
data = spi.xfer(Data)
print(hex(Data[0]))
if Data == 0xAA:
print("match")
spi.close()
Page 161
import subprocess
import spidev
def checkSPI():
temp = subprocess.Popen(["sudo", "dtparam", "-l"], stdout=subprocess.PIPE)
output = str(temp.communicate())
lastSPI = output.rfind("spi")
if lastSPI != -1:
lastSPI = output.find("spi=on", lastSPI)
if lastSPI == -1:
temp = subprocess.Popen(
["sudo", "dtparam", "spi=on"], stdout=subprocess.PIPE)
output = str(temp.communicate())
checkSPI()
spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 100000
spi.mode = 0
spi.bits_per_word = 8
Data = [0x01, 0x80, 0x00]
spi.xfer(Data)
raw = (Data[1] & 0x03) << 8 | Data[2]
print(raw)
volts = raw * 3.3 / 1023.0
print(volts, "V")
spi.close()
