def read_raw(self):
# reads the raw value from the selected previously planned one-shot operation or continuous
# requires correctly bits
readlen = 4 if self.lastmeasure.bits == 18 else 3 # if bits=18 : 4 else: 3
with (yield self.i2cbus.iolock.acquire()):
bytes = pigpio.u2i((yield self.i2cbus.apigpio_command(pigpio._PI_CMD_I2CRD, self.i2c, readlen)))
if bytes <= 0: return
data = yield self.i2cbus.arxbuf(bytes)
status = data[readlen - 1]
if status & 0x80:
print("Converting in progress")
return # converting in progress
if (self.lastmeasure._mode & 0x7f) != (status & 0x7f):
print("Status unexpected")
return # something is bad
value = 0
for i in range(readlen - 1): value = (value << 8) | data[i] # join bytes into number
#print("readRaw end %s %x" %(value,status))
bits = (status & 0x0c) >> 2
sign = BIT_MASKS[bits][1] & value
value &= BIT_MASKS[bits][0]
if sign: value = -value
self.lastmeasure._set_voltage(2.048 / BIT_MASKS[bits][0] * value)
raise gen.Return(True)
def read_raw(self):
# reads the raw value from the selected previously planned one-shot operation or continuous
# requires correctly bits
readlen = 4 if self.lastmeasure.bits == 18 else 3 # if bits=18 : 4 else: 3
with (yield self.i2cbus.iolock.acquire()):
bytes = pigpio.u2i(
(yield self.i2cbus.apigpio_command(pigpio._PI_CMD_I2CRD,
self.i2c, readlen)))
if bytes <= 0: return
data = yield self.i2cbus.arxbuf(bytes)
status = data[readlen - 1]
if status & 0x80:
print("Converting in progress")
return # converting in progress
if (self.lastmeasure._mode & 0x7f) != (status & 0x7f):
print("Status unexpected")
return # something is bad
value = 0
for i in range(readlen - 1):
value = (value << 8) | data[i] # join bytes into number
#print("readRaw end %s %x" %(value,status))
bits = (status & 0x0c) >> 2
sign = BIT_MASKS[bits][1] & value
value &= BIT_MASKS[bits][0]
if sign: value = -value
self.lastmeasure._set_voltage(2.048 / BIT_MASKS[bits][0] * value)
raise gen.Return(True)