Update raw_usb interface

* Update raw_usb interface to the 0200 version
* Rename ice* commands to be less confusing
* Split production test into a runner script and test library
* Add continuous randomized test for test library
* Speed improvements for nvcm commands

hw/production_test/pybin2nvcm.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+""" bistream to NVCM command conversion is based on majbthrd's work
+in https://github.com/YosysHQ/icestorm/pull/272
+"""
+
+
+def pybin2nvcm(bitstream: bytes) -> list[str]:
+    """Convert an ice40 bitstream into an NVCM program
+
+    The NVCM format is a set of commands that are run against the
+    NVCM state machine, which instruct the state machine to write
+    the bitstream into the NVCM. It's somewhat convoluted!
+
+    Keyword arguments:
+    bitstream -- Bitstream to convert into NVCM format
+    """
+
+    # ensure that the file starts with the correct bistream preamble
+    for origin in range(0, len(bitstream)):
+        if bitstream[origin:origin + 4] == bytes.fromhex('7EAA997E'):
+            break
+
+    if origin == len(bitstream):
+        raise ValueError('Preamble not found')
+
+    print(f'Found preamable at {origin:08x}')
+
+    # there might be stuff in the header with vendor tools,
+    # but not usually in icepack produced output, so ignore it for now
+
+    rows = []
+
+    rows.append('06')
+
+    for pos in range(origin, len(bitstream), 8):
+        row = bitstream[pos:pos + 8]
+
+        # pad out to 8-bytes
+        row += b'\0' * (8 - len(row))
+
+        if row == bytes(8):
+            # skip any all-zero entries in the bistream
+            continue
+
+        # NVCM addressing is very weird
+        addr = pos - origin
+        nvcm_addr = int(addr / 328) * 4096 + (addr % 328)
+
+        row_str = f'02{nvcm_addr:06x}{row.hex()}'
+        row_str = ' '.join([row_str[i:i + 2]
+                            for i in range(0, len(row_str), 2)]) + ' '
+
+        rows.append(row_str)
+
+    rows.append('04')
+
+    return rows
+
+
+if __name__ == "__main__":
+
+    import argparse
+
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument('infile',
+                        type=str,
+                        help='input bin file')
+
+    parser.add_argument('outfile',
+                        type=str,
+                        help='output nvcm file')
+
+    args = parser.parse_args()
+
+    with open(args.infile, 'rb') as f_in:
+        data = f_in.read()
+
+    cmds = pybin2nvcm(data)
+
+    with open(args.outfile, 'w', encoding='utf-8') as f_out:
+        for cmd in cmds:
+            f_out.write(cmd)
+            f_out.write('\n')