1 files changed, 188 insertions, 0 deletions
diff --git a/tools/usb_test.py b/tools/usb_test.py
new file mode 100644
index 0000000..0f61593
--- /dev/null
+++ b/tools/usb_test.py
@@ -0,0 +1,188 @@
+#!/usr/bin/env python
+
+import time
+from pprint import pprint
+from enum import Enum
+from functools import cache
+from dataclasses import dataclass, fields, astuple
+import struct
+import binascii
+
+import numpy as np
+import click
+import serial
+from cobs import cobs
+
+class CobsSerial:
+    def __init__(self, port, timeout):
+        self.ser = serial.Serial(port, timeout=timeout)
+        self.ser.flushOutput()
+        self.ser.flushInput()
+        self.ser.write(bytes([0])) # synchronize
+        self.ser.flushOutput()
+
+    def write_packet(self, data):
+        self.ser.write(cobs.encode(data))
+        self.ser.write(bytes([0]))
+        self.ser.flushOutput()
+
+    def read_packet(self):
+        data = b''
+        while (b := self.ser.read(1)):
+            if b[0] == 0:
+                break
+            data += b
+
+        if data:
+            return parse_packet(cobs.decode(data))
+        else:
+            return None
+
+    def command(self, command, args=b''):
+        self.write_packet(bytes([command.value]) + args)
+        return self.read_packet()
+
+
+class SerializableEnum(Enum):
+    def __int__(self):
+        return self.value
+
+class PacketType(SerializableEnum):
+    USBP_GET_STATUS = 0
+    USBP_GET_MEASUREMENTS = 1
+    USBP_SET_MOTOR = 2
+
+class ErrorCode(Enum):
+    ERR_SUCCESS = 0
+    ERR_TIMEOUT = 1
+    ERR_PHYSICAL_LAYER = 2
+    ERR_FRAMING = 3
+    ERR_PROTOCOL = 4
+    ERR_DMA = 5
+    ERR_BUSY = 6
+    ERR_BUFFER_OVERFLOW = 7
+    ERR_RX_OVERRUN = 8
+    ERR_TX_OVERRUN = 9
+
+class BoardConfig(Enum):
+    BCFG_UNCONFIGURED = 0
+    BCFG_DISPLAY = 1
+    BCFG_MOTOR = 2
+    BCFG_MEAS = 3
+
+class Serialized:
+    @classmethod
+    def deserialize(kls, data):
+        fields = struct.unpack(kls._struct_format(), data)
+        mapped = [cast(val) for cast, val in zip(kls._struct_casts(), fields)]
+        return kls(*mapped)
+
+    def serialize(self):
+        mapped = [uncast(val) for uncast, val in zip(self._struct_uncasts(), astuple(self))]
+        return struct.pack(self._struct_format(), *mapped)
+
+    @classmethod
+    @cache
+    def _struct_format(kls):
+        return kls._parse_fields()[0]
+
+    @classmethod
+    @cache
+    def _struct_casts(kls):
+        return kls._parse_fields()[1]
+
+    @classmethod
+    @cache
+    def _struct_uncasts(kls):
+        return kls._parse_fields()[2]
+
+    @classmethod
+    def _parse_fields(kls):
+        fmt = '<'
+        casts = []
+        uncasts = []
+        for field in fields(kls):
+            if isinstance(field.type, tuple):
+                struct_type, cast, uncast, *_ = *field.type, int
+            else:
+                struct_type, cast, uncast = field.type, int, int
+            fmt += struct_type
+            casts.append(cast)
+            uncasts.append(uncast)
+        return fmt, casts, uncasts
+
+def timestamp(value):
+    return float(value) / 1e6
+
+@dataclass
+class StatusPacket(Serialized):
+    packet_type: ('B', PacketType)
+    sys_time_us: ('Q', timestamp)
+    has_lcd: ('B', bool)
+    has_adc: ('B', bool)
+    board_config: ('B', BoardConfig)
+    bus_addr: 'B'
+    last_uart_error: ('B', ErrorCode)
+    last_uart_error_timestamp: ('Q', timestamp)
+    last_uart_rx: ('Q', timestamp)
+    last_uart_tx: ('Q', timestamp)
+    last_bus_error: ('B', ErrorCode)
+    last_bus_error_timestamp: ('Q', timestamp)
+
+@dataclass
+class MotorPacket(Serialized):
+    packet_type: ('B', PacketType)
+    speed_rpm: 'i'
+
+def parse_packet(data):
+    packet_type = PacketType(data[0])
+    if packet_type == PacketType.USBP_GET_STATUS:
+        return StatusPacket.deserialize(data)
+    if packet_type == PacketType.USBP_GET_MEASUREMENTS:
+        return MeasurementPacket.deserialize(data)
+    else:
+        raise ValueError(f'Unsupported packet type {packet_type}')
+
+@dataclass
+class MeasurementPacket(Serialized):
+    packet_type: ('B', PacketType)
+    num_channels: 'B'
+    _num_samples_a: 'I'
+    _num_samples_b: 'I'
+    _measurements_raw: ('240s', bytes)
+
+    @property
+    def measurements(self):
+        return np.frombuffer(self._measurements_raw, np.dtype(np.int32).newbyteorder('<')).reshape([2, 2, -1])
+
+    @property
+    def num_samples(self):
+        return [self._num_samples_a, self._num_samples_b]
+
+@click.group()
+def cli():
+    pass
+
+@cli.command()
+@click.argument('port')
+@click.option('--timeout', type=float, default=1)
+def probe(port, timeout):
+    ser = CobsSerial(port, timeout)
+    pprint(ser.command(PacketType.USBP_GET_STATUS))
+    while True:
+        time.sleep(0.01)
+        packet = ser.command(PacketType.USBP_GET_MEASUREMENTS)
+        for i in range(packet.num_samples[1]):
+            print(packet.measurements[1,1,i], packet.num_samples[1])
+
+@cli.command()
+@click.argument('port')
+@click.argument('speed_rpm', type=int, default=0)
+@click.option('--timeout', type=float, default=1)
+def motor(port, speed_rpm, timeout):
+    ser = CobsSerial(port, timeout)
+    packet = MotorPacket(PacketType.USBP_SET_MOTOR, speed_rpm)
+    ser.write_packet(packet.serialize())
+
+if __name__ == '__main__':
+    cli()