Initial commit

Pipfile

+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+tqdm = "*"
+sacada = {editable = true,path = "."}
+pyserial = "*"
+click = "*"
+
+[requires]
+python_version = "3.5"

bin/sacada

+#!/usr/bin/env python3
+
+from time import sleep
+import click
+from tqdm import tqdm
+from sacada.SACADA import SACADA
+
+@click.group()
+@click.option('--port', default="/dev/ttyACM0", help='serial port location eg.: /dev/ttyACM0 (default)')
+@click.pass_context
+def cli(ctx, port):
+    ctx.obj['s'] = SACADA(port)
+
+@cli.command()
+@click.pass_context
+def show(ctx):
+    click.echo(ctx.obj['s'].identify())
+
+@cli.command()
+@click.argument('channel')
+@click.pass_context
+def read(ctx, channel):
+    click.echo(ctx.obj['s'].readVoltage(channel))
+
+@cli.command()
+@click.argument('channel')
+@click.option('--interval', default=1000, help='interval bewteen readings (ms)')
+@click.pass_context
+def monitor(ctx, channel, interval):
+    with tqdm(total=18, desc="Channel {}".format(channel), bar_format="{desc}|{bar}|{n_fmt}V") as bar:
+        while True:
+            bar.n = ctx.obj['s'].readVoltage(channel)
+            bar.refresh()
+            sleep(interval/1000.0)
+
+if __name__ == '__main__':
+    cli(obj={})

sacada/SACADA.py

+from serial import Serial
+
+class InvalidChannel(Exception):
+    pass
+
+class InvalidOption(Exception):
+    pass
+
+class SACADA(object):
+
+    """SACADA boards Python interface
+       Right now it just implements support for SACADA Mini using SCPI
+       over USB-CDC. The plan is to provide a generic base class for use
+       with all SACADA boards.
+    """
+
+    IN_CHANNELS = ["A0", "A1", "A2", "A3", "A4", "INSTR"]
+    OUT_CHANNELS = ["CH1", "CH2"]
+
+    def __init__(self, location):
+        self.open(location)
+
+    def open(self, location):
+        self._serial = Serial(location, timeout=1) # We use USB-CDC so baud rate doesn't matter
+
+    def close(self):
+        self._serial.close()
+
+    def identify(self):
+        return self.sendSCPICommand("*IDN?")
+
+    def sendSCPICommand(self, command):
+        self._write(command + "\r\n") # SACADA Mini requires \r\n at the end of commands
+        return self._read()
+
+    def readVoltage(self, channel):
+        if channel not in self.IN_CHANNELS:
+            raise InvalidChannel("{} is not a valid input channel".format(channel))
+
+        return float(self.sendSCPICommand("MEAS:VOLT:DC? {}".format(channel)))
+
+    def setVoltage(self, channel, voltage):
+        if channel not in self.OUT_CHANNELS:
+            raise InvalidChannel("{} is not a valid output channel".format(channel))
+
+        return float(self.sendSCPICommand("SET:VOLT:DC {} {}".format(channel, voltage)))
+
+    def _write(self, m):
+        self._serial.write(bytes(m, "utf-8"))
+
+    def _read(self):
+        return self._serial.readline().strip()

sacada/__init__.py

+from . import SACADA

setup.py

+
+from setuptools import setup, find_packages
+
+setup(name='sacada', version='0.1', packages=['sacada'])