1 files changed, 72 insertions, 0 deletions
diff --git a/controller/fw/src/ldpc_decoder_test.py b/controller/fw/src/ldpc_decoder_test.py
new file mode 100644
index 0000000..3b91bba
--- /dev/null
+++ b/controller/fw/src/ldpc_decoder_test.py
@@ -0,0 +1,72 @@
+
+import pyldpc
+import scipy.sparse
+import numpy as np
+import test_decoder
+import os, sys
+import ctypes as C
+import argparse
+
+if __name__ != '__main__':
+    raise RuntimeError("Please don't import this module, this is a command-line program.")
+
+parser = argparse.ArgumentParser()
+parser.add_argument('-r', '--reference', action='store_true', default=False, help='Run reference decoder instead of C implemention')
+args = parser.parse_args()
+
+lib = C.CDLL('./ldpc_decoder_test.so')
+
+n = 5*19
+nodes, bits = 17, 19
+H, G = pyldpc.make_ldpc(n, nodes, bits, systematic=False, seed=0)
+_1, bits_pos, _2 = scipy.sparse.find(H)
+_, k = G.shape
+
+st = np.random.RandomState(seed=0)
+test_data = st.randint(0, 2, k)
+d = np.dot(G, test_data) % 2
+x = (-1) ** d
+x[29:] = 0
+
+bits_pos = bits_pos.astype(np.uint32)
+x = x.astype(np.int8)
+
+lib.decode.argtypes = [C.c_size_t, C.c_size_t, C.c_size_t, C.POINTER(C.c_size_t), C.POINTER(C.c_int8), C.POINTER(C.c_int8), C.c_uint]
+lib.get_message.argtypes = [C.c_size_t, C.c_size_t, C.POINTER(C.c_int8), C.POINTER(C.c_int8), C.POINTER(C.c_int8)]
+
+if args.reference:
+    ref_out = test_decoder.decode(H, x, 3)
+    print('decoder output:', ref_out, flush=True)
+    print('msg reconstruction:', test_decoder.get_message(G, ref_out))
+    print('reference decoder: ', np.all(np.equal(test_decoder.get_message(G, ref_out), test_data)), flush=True)
+    np.set_printoptions(linewidth=220)
+    print(test_data)
+    print(test_decoder.get_message(G, ref_out))
+    print(test_decoder.get_message(G, ref_out) ^ test_data)
+
+else:
+    out = np.zeros(n, dtype=np.uint8)
+    # print('python data:', x, flush=True)
+    print('decoder iterations:', lib.decode(n, nodes, bits,
+        bits_pos.ctypes.data_as(C.POINTER(C.c_ulong)),
+        x.ctypes.data_as(C.POINTER(C.c_int8)),
+        out.ctypes.data_as(C.POINTER(C.c_int8)),
+        25), flush=True)
+    print('decoder output:', out)
+    print('msg reconstruction:', test_decoder.get_message(G, out.astype(np.int64)))
+    print('decoder under test:', np.all(np.equal(test_decoder.get_message(G, out.astype(np.int64)), test_data)))
+    np.set_printoptions(linewidth=220)
+    print(test_data)
+    print(test_decoder.get_message(G, out.astype(np.int64)))
+    G = G.astype(np.int8)
+    msg = np.zeros(k, dtype=np.int8)
+    lib.get_message(
+            n, k,
+            G.ctypes.data_as(C.POINTER(C.c_int8)),
+            out.astype(np.int8).ctypes.data_as(C.POINTER(C.c_int8)),
+            msg.ctypes.data_as(C.POINTER(C.c_int8)))
+    print(msg)
+    print(msg ^ test_data)
+
+print('codeword length:', len(x))
+print('data length:', len(test_data))