def get_device_info(self):
"""
Return information about the device.
:return: A list containing board type, major and minor firmware versions, 16 byte unique identifier, \
microcontroller part and bootcode version numbers.
"""
sfp_code, args = decode_sfp(self.low_level_io(1, encode_sfp(255, [])))
if sfp_code != 255:
errmsg("IoTPy error: get_device_info wrong code.")
# raise IoTPy_APIError("")
device_data = args
if device_data[0] >> 24 != 0x55: # 0x55 = 'U'
print("IoTPy error: getDeviceInfo unknown device/firmware type")
# return
device_info = {
'fw_maj': (device_data[0] & 0x00ff0000) >>
16, # Firmware major version number
'fw_min':
device_data[0] & 0x0000ffff, # Firmware minor version number
'uid': UUID(bytes=device_data[1]), # 128bit unique ID
'cpu_id': device_data[2], # UPER LPC CPU part number
'boot': device_data[3], # UPER LPC CPU bootload code version
}
return device_info
def transaction(self, address, write_data, read_length):
"""
Perform I2C data transaction.
I2C data transaction consists of (optional) write transaction, followed by (optional) read transaction.
:param address: I2C device address.
:type address: int
:param write_data: A byte sequence to be transmitted. If write_data is empty string, no write transaction \
will be executed.
:type write_data: str
:param read_length: A number of bytes to be received. If read_length is 0, no read transaction will be executed.
:type read_length: int
:return: Received data and I2C transaction status/error code.
:rtype: (str, int)
:raise: IoTPy_APIError, IoTPy_ThingError
"""
try:
result = decode_sfp(self.board.low_level_io(1, encode_sfp(41, [address, write_data, read_length])))
except IoTPy_APIError:
errmsg("UPER API: I2C bus not connected.")
raise IoTPy_IOError("I2C bus not connected.")
return result[1][1], result[1][2] # return read buffer and error
def get_device_info(self):
"""
Return information about the device.
:return: A list containing board type, major and minor firmware versions, 16 byte unique identifier, \
microcontroller part and bootcode version numbers.
"""
sfp_code, args = decode_sfp(self.low_level_io(1, encode_sfp(255, [])))
if sfp_code != 255:
errmsg("IoTPy error: get_device_info wrong code.")
# raise IoTPy_APIError("")
device_data = args
if device_data[0] >> 24 != 0x55: # 0x55 = 'U'
print("IoTPy error: getDeviceInfo unknown device/firmware type")
# return
device_info = {
'fw_maj': (device_data[0] & 0x00ff0000) >> 16, # Firmware major version number
'fw_min': device_data[0] & 0x0000ffff, # Firmware minor version number
'uid': UUID(bytes=device_data[1]), # 128bit unique ID
'cpu_id': device_data[2], # UPER LPC CPU part number
'boot': device_data[3], # UPER LPC CPU bootload code version
}
return device_info
def set_pulse_time(self, pulse_us):
"""
Set PWM high (on state) time.
:param pulse_us: Pulse time in microseconds.
:type pulse_us: int
:raise: IoTPy_APIError
"""
if self.primary:
self.board.low_level_io(0, encode_sfp(
2, [self.logical_pin])) # set pin secondary function
self.primary = False
if 0 <= pulse_us <= PWM_PORT_RUNNING[self.pwm_port]['period']:
self.pulse_time = pulse_us
high_time = pulse_us
if self.polarity == 0:
high_time = PWM_PORT_RUNNING[
self.pwm_port]['period'] - pulse_us
self.board.low_level_io(
0,
encode_sfp(PWM._PWM_PORT_FUNCTIONS[self.pwm_port][1],
[self.pwm_pin, high_time]))
else:
errmsg(
"UPER error: PWM high time is out of range on logical pin %d."
% self.logical_pin)
raise IoTPy_APIError("PWM high time is out of range.")
def interrupt_handler(self):
with self.irq_available:
while self.alive:
self.irq_available.wait(0.05)
while len(self.irq_requests):
interrupt = self.irq_requests.pop(0)
try:
self.callback(interrupt[1])
except Exception as e:
errmsg("IoTPy: Interrupt callback error (%s)" % e)
self.alive = False
def __init__(self, board, pin):
self.board = board
if self.board.pinout[pin].capabilities & CAP_ADC:
self.logical_pin = self.board.pinout[pin].pinID
else:
errmsg("IO API: Pin "+str(pin)+" is not an ADC pin.")
raise IoTPy_APIError("Trying to assign ADC function to non ADC pin.")
self.adc_pin = self.board.pinout[pin].extra[0]
self.board.low_level_io(0, encode_sfp(3, [self.logical_pin, 0])) # set GPIO to HIGH_Z
self.board.low_level_io(0, encode_sfp(2, [self.logical_pin])) # set secondary pin function
self.primary = False
def interrupt_handler(self):
with self.irq_available:
while self.alive:
self.irq_available.wait(0.05)
while len(self.irq_requests):
interrupt = self.irq_requests.pop(0)
try:
self.callback(interrupt[1])
except Exception as e:
errmsg("IoTPy: Interrupt callback error (%s)" % e)
self.alive = False
def __init__(self, board, pin):
self.board = board
if self.board.pinout[pin].capabilities & CAP_ADC:
self.logical_pin = self.board.pinout[pin].pinID
else:
errmsg("IO API: Pin " + str(pin) + " is not an ADC pin.")
raise IoTPy_APIError(
"Trying to assign ADC function to non ADC pin.")
self.adc_pin = self.board.pinout[pin].extra[0]
self.board.low_level_io(0, encode_sfp(
3, [self.logical_pin, 0])) # set GPIO to HIGH_Z
self.board.low_level_io(0, encode_sfp(
2, [self.logical_pin])) # set secondary pin function
self.primary = False
def __init__(self, board, pin, freq=100, polarity=1):
self.board = board
if self.board.pinout[pin].capabilities & CAP_PWM:
self.logical_pin = self.board.pinout[pin].pinID
else:
errmsg("UPER API: Pin No:%d is not a PWM pin.", pin)
raise IoTPy_APIError("Trying to assign PWM function to non PWM pin.")
self.pwm_port = self.board.pinout[pin].extra[0]
self.pwm_pin = self.board.pinout[pin].extra[1]
self.primary = True
self.pulse_time = 0
self.polarity = polarity
PWM_PORT_RUNNING[self.pwm_port]["channels"] += 1
if PWM_PORT_RUNNING[self.pwm_port]["channels"] == 1:
self.set_frequency(freq)
def internal_call_back(self, interrupt_data):
"""
:param interrupt_data:
:return:
"""
interrupt_event = {'id': interrupt_data[0], 'type': interrupt_data[1] & 0xFF, 'values': interrupt_data[1] >> 8}
callback_entry = self.callbackdict[self.interrupts[interrupt_event['id']]]
try:
callback_entry['callback'](interrupt_event, callback_entry['userobject'])
except Exception as e:
errmsg("IoTPy Interrupt callback exception: %s" % e)
return
def __init__(self, board, pin, freq=100, polarity=1):
self.board = board
if self.board.pinout[pin].capabilities & CAP_PWM:
self.logical_pin = self.board.pinout[pin].pinID
else:
errmsg("UPER API: Pin No:%d is not a PWM pin.", pin)
raise IoTPy_APIError(
"Trying to assign PWM function to non PWM pin.")
self.pwm_port = self.board.pinout[pin].extra[0]
self.pwm_pin = self.board.pinout[pin].extra[1]
self.primary = True
self.pulse_time = 0
self.polarity = polarity
PWM_PORT_RUNNING[self.pwm_port]['channels'] += 1
if PWM_PORT_RUNNING[self.pwm_port]['channels'] == 1:
self.set_frequency(freq)
def scan(self):
"""
Scan I2C interface for connected devices.
:return: A list of active I2C device addresses.
:rtype: list
"""
dev_list = []
for address in range(1, 128):
try:
result = self.board.low_level_io(1, encode_sfp(41, [address, b'', 0]))
if result[-1] == 'X':
dev_list.append(address)
except IoTPy_APIError:
errmsg("UPER API: I2C bus not connected.")
raise IoTPy_IOError("I2C bus not connected.")
return dev_list
def __init__(self, board, pin):
self.board = board
if self.board.pinout[pin].capabilities & CAP_GPIO:
self.logical_pin = self.board.pinout[pin].pinID
else:
errmsg("UPER API: Pin No:%d is not GPIO pin.", pin)
raise IoTPy_APIError(
"Trying to assign GPIO function to non GPIO pin.")
# Configure default state to be input with pull-up resistor
self.board.low_level_io(0,
encode_sfp(1,
[self.logical_pin])) # set primary
self.direction = self.INPUT
self.resistor = self.PULL_UP
self.setup(
self.direction,
self.resistor) # default GPIO pin state is INPUT and PULL_UP
def set_period(self, period_us):
"""
Set PWM period.
:param period_us: PWM signal period in microseconds.
:type period_us: int
:raise: IoTPy_APIError
"""
if 0 <= period_us <= self._PWM_PORT_MAX[self.pwm_port]:
if PWM_PORT_RUNNING[self.pwm_port]["period"] != period_us:
self.board.low_level_io(0, encode_sfp(self._PWM_PORT_FUNCTIONS[self.pwm_port][0], [period_us]))
PWM_PORT_RUNNING[self.pwm_port]["period"] = period_us
else:
errmsg(
"UPER API: PWM period for port %d can be only between 0-%d"
% (self.pwm_port, self._PWM_PORT_MAX[self.pwm_port])
)
raise IoTPy_APIError("PWM period is out of range.")
def attach_irq(self,
event,
callback=None,
user_object=None,
debounce_time=50):
"""
Attach (enable) or reconfigure GPIO interrupt event.
:param event: GPIO interrupt event. Can have one of these values: GPIO.RISE, GPIO.FALL, GPIO.CHANGE, \
GPIO.LOW or GPIO.HIGH.
:param callback: User callback function. This function is executed when the interrupt event is received. \
It should take two arguments: interrupt event description and user object. Interrupt event descriptor is \
dictionary with three fields: 'id' - the interrupt ID (interrupt channel), 'event' - interrupt event type \
and 'values' - the logical values on each of interrupt channel (N-th bit represents logical pin value of \
interrupt channel N). User object is the same object as user_object.
:param user_object: User defined object, which will be passed back to the callback function. Optional, \
default is None.
:param debounce_time: Interrupt disable time in milliseconds after the triggering event. This is used to \
"debounce" buttons or to protect communication channel from data flood. Optional, default is 50ms.
:return: Logical interrupt ID
:rtype: int
:raise: IoTPy_APIError
"""
try:
irq_id = self.board.interrupts.index(self.logical_pin)
self.board.low_level_io(0,
encode_sfp(7,
[irq_id])) # detach interrupt
except ValueError:
try:
irq_id = self.board.interrupts.index(None)
self.board.interrupts[irq_id] = self.logical_pin
except ValueError:
errmsg("UPER API: more than 8 interrupts requested")
raise IoTPy_APIError("Too many interrupts.")
self.board.callbackdict[self.logical_pin] = {
'mode': event,
'callback': callback,
'userobject': user_object
}
self.board.low_level_io(
0, encode_sfp(6, [irq_id, self.logical_pin, event, debounce_time]))
return irq_id
def set_period(self, period_us):
"""
Set PWM period.
:param period_us: PWM signal period in microseconds.
:type period_us: int
:raise: IoTPy_APIError
"""
if 0 <= period_us <= self._PWM_PORT_MAX[self.pwm_port]:
if PWM_PORT_RUNNING[self.pwm_port]['period'] != period_us:
self.board.low_level_io(
0,
encode_sfp(self._PWM_PORT_FUNCTIONS[self.pwm_port][0],
[period_us]))
PWM_PORT_RUNNING[self.pwm_port]['period'] = period_us
else:
errmsg(
"UPER API: PWM period for port %d can be only between 0-%d" %
(self.pwm_port, self._PWM_PORT_MAX[self.pwm_port]))
raise IoTPy_APIError("PWM period is out of range.")
def __init__(self, board, port=0, divider=1, mode=MODE_0):
divider = min(max(divider, 1), 256)
self.board = board
self.port = port
self.divider = divider
self.mode = mode
if self.port == 1:
self.board.low_level_io(0, encode_sfp(2, [4]))
self.board.low_level_io(0, encode_sfp(2, [5]))
self.board.low_level_io(0, encode_sfp(2, [11]))
self.board.low_level_io(0, encode_sfp(30, [self.divider, self.mode]))
elif self.port == 0:
self.board.low_level_io(0, encode_sfp(2, [12]))
self.board.low_level_io(0, encode_sfp(2, [13]))
self.board.low_level_io(0, encode_sfp(2, [14]))
self.board.low_level_io(0, encode_sfp(20, [self.divider, self.mode]))
else:
errmsg("UPER API: Wrong SPI port number.", self.port)
raise IoTPy_APIError("SPI port must be 0 or 1, trying to assign something else.")
def internal_call_back(self, interrupt_data):
"""
:param interrupt_data:
:return:
"""
interrupt_event = {
'id': interrupt_data[0],
'type': interrupt_data[1] & 0xFF,
'values': interrupt_data[1] >> 8
}
callback_entry = self.callbackdict[self.interrupts[
interrupt_event['id']]]
try:
callback_entry['callback'](interrupt_event,
callback_entry['userobject'])
except Exception as e:
errmsg("IoTPy Interrupt callback exception: %s" % e)
return
def set_pulse_time(self, pulse_us):
"""
Set PWM high (on state) time.
:param pulse_us: Pulse time in microseconds.
:type pulse_us: int
:raise: IoTPy_APIError
"""
if self.primary:
self.board.low_level_io(0, encode_sfp(2, [self.logical_pin])) # set pin secondary function
self.primary = False
if 0 <= pulse_us <= PWM_PORT_RUNNING[self.pwm_port]["period"]:
self.pulse_time = pulse_us
high_time = pulse_us
if self.polarity == 0:
high_time = PWM_PORT_RUNNING[self.pwm_port]["period"] - pulse_us
self.board.low_level_io(0, encode_sfp(PWM._PWM_PORT_FUNCTIONS[self.pwm_port][1], [self.pwm_pin, high_time]))
else:
errmsg("UPER error: PWM high time is out of range on logical pin %d." % self.logical_pin)
raise IoTPy_APIError("PWM high time is out of range.")
