def read(source, count):
with i2c.I2CMaster() as bus:
print("reading %d bytes from %02x" % (count, source))
result = bus.transaction(
i2c.writing_bytes(I2C_SLAVE_ADDRESS, source),
i2c.reading(I2C_SLAVE_ADDRESS, count))
return result[0]
def handle_exception(self):
'''
1 - Unknown Command
2 - Invalid Session ID
3 - Invalid CRC
4 - Invalid Length
5 - Invalid Address
6 - Invalid Function
8 - Content Mixmatch
12- Wrong Param
'''
while GPIO.input(SW_XFER_PIN):
pass
if not GPIO.input(SW_XFER_PIN):
GPIO.setup(SW_XFER_PIN, GPIO.OUT, initial=GPIO.LOW)
try:
data = self.i2c.transaction(i2c.reading(SW_ADDR, 132))
return data[0]
except IOError:
return [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
GPIO.setup(SW_XFER_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
def handle_exception(self):
'''
1 - Unknown Command
2 - Invalid Session ID
3 - Invalid CRC
4 - Invalid Length
5 - Invalid Address
6 - Invalid Function
8 - Content Mixmatch
12- Wrong Param
'''
while GPIO.input(SW_XFER_PIN):
pass
if not GPIO.input(SW_XFER_PIN):
GPIO.setup(SW_XFER_PIN, GPIO.OUT, initial=GPIO.LOW)
try:
data = self.i2c.transaction(i2c.reading(SW_ADDR, 132))
return data[0]
except IOError:
return [0,0,0,0,0,0,0,0,0,0]
GPIO.setup(SW_XFER_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
def i2c_read(len):
data = i2cm.transaction(i2c.reading(SW_ADDR, len))
return data[0]
import time
address = 0x28
# 0x28 = bin0101000 = dec40
# DF command = 7 bit slave address + 0 = 0x28 = dec40
# MR command = 7 bit slave address + 1 = 0x29 = dec41
with i2c.I2CMaster() as bus:
print ("send MR command")
bus.transaction(i2c.writing_bytes(address, 0x29, 0x00))
time.sleep(0.2)
print ("send DF command and read 4 bytes")
read_b1 = bus.transaction(
i2c.writing_bytes(address, 0x28),
i2c.reading(address, 1))
print ("Bye 1: %d" % read_b1[0][0])
read_b2 = bus.transaction(
i2c.writing_bytes(address, 0x28),
i2c.reading(address, 2))
print ("Bye 2: %d" % read_b2[0][1])
read_b3 = bus.transaction(
i2c.writing_bytes(address, 0x28),
i2c.reading(address, 3))
print ("Bye 3: %d" % read_b3[0][2])
read_b4 = bus.transaction(
i2c.writing_bytes(address, 0x28),
i2c.reading(address, 4))
print ("Bye 4: %d" % read_b4[0][3])
uh = (read_b1[0][0] << 8) | (read_b2[0][1])
uh = uh & 0x3FFF
