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import serial
import time
import signal
class PicoPulseGen:
def __init__(self, port='/dev/ttyACM0'):
self._pulse_offset = 0
self._pulse_width = 0
self._trig_edges = 0
self.pico = serial.Serial(port, 115200)
time.sleep(0.1)
self.pico.write(b'S')
test = self.pico.readline()
if b'PulseGenerator' not in test:
raise ConnectionError('Could not connect to the PulseGenerator :(')
signal.signal(signal.SIGALRM, self.arm_abort)
@property
def pulse_offset(self):
return self._pulse_offset
@pulse_offset.setter
def pulse_offset(self, offset):
if type(offset) != int or offset < 0 or offset > 0xFFFFFFFF:
raise ValueError('Offset has to be an int between 0 and 0xFFFFFFFF')
self._pulse_offset = offset
self.pico.flushInput()
self.pico.write(b'O')
self.pico.write((self._pulse_offset).to_bytes(4, 'little'))
ret = self.pico.readline()
assert int(ret.strip()) == self._pulse_offset, ret
@property
def pulse_width(self):
return self._pulse_width
@pulse_width.setter
def pulse_width(self, width):
if type(width) != int or width < 0 or width > 0xFFFFFFFF:
raise ValueError('Width has to be an int between 0 and 0xFFFFFFFF')
self._pulse_width = width
self.pico.flushInput()
self.pico.write(b'W')
self.pico.write((self._pulse_width).to_bytes(4, 'little'))
ret = self.pico.readline()
assert int(ret.strip()) == self._pulse_width, ret
@property
def trig_edges(self):
return self._trig_edges
@trig_edges.setter
def trig_edges(self, edges):
if type(edges) != int or edges < 0 or edges > 0xFFFFFFFF:
raise ValueError('Width has to be an int between 0 and 0xFFFFFFFF')
self._trig_edges = edges
self.pico.write(b'E')
self.pico.write((self._trig_edges).to_bytes(4, 'little'))
ret = self.pico.readline()
assert int(ret.strip()) == self._trig_edges, ret
def arm(self):
self.pico.write(b'A')
ret = self.pico.readline()
assert b'A' in ret
def wait_trig(self, timeout=5):
self.pico.write(b'B')
signal.alarm(timeout)
ret = self.pico.readline()
signal.alarm(0)
assert b'T' in ret
def arm_abort(self, signum, frame):
print('No trigger observed, disarming!')
self.pico.write(b'D')
def status(self):
self.pico.write(b'S')
ret = self.pico.readline()
print(ret.decode('utf-8'))
def set_gpio(self, state):
if type(state) != int or state < 0:
raise ValueError('State has to be zero (GPIO 0) or a positive value larger than zero (GPIO 1)')
self.pico.write(b'G')
self.pico.write(bytes([7])) # For now there is only one GPIO pin used for this functionality
if state:
self.pico.write(bytes([1]))
else:
self.pico.write(bytes([0]))
ret = self.pico.readline()
assert b'G' in ret
def read_gpios(self):
self.pico.write(b'R')
ret = self.pico.readline()
ret = int(ret.strip())
return ret
def close(self):
self.pico.close()
def __del__(self):
self.pico.close()
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