1 files changed, 35 insertions, 0 deletions
diff --git a/unittest/tqam16.c b/unittest/tqam16.c
new file mode 100644
index 0000000..9e4c8d0
--- /dev/null
+++ b/unittest/tqam16.c
@@ -0,0 +1,35 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: tqam16.c
+  AUTHOR......: David Rowe
+  DATE CREATED: August 2020
+
+  Simple sanity check for QAM16 symbol mapping.
+
+\*---------------------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <string.h>
+
+#include "ofdm_internal.h"
+
+int main(void) {
+  int c;
+  for (c = 0; c < 16; c++) {
+    int tx_bits[4], rx_bits[4];
+    for (int i = 0; i < 4; i++) tx_bits[i] = (c >> (3 - i)) & 0x1;
+    complex float symbol = qam16_mod(tx_bits);
+    qam16_demod(symbol, rx_bits);
+    if (memcmp(tx_bits, rx_bits, 4)) {
+      fprintf(stderr, "FAIL on %d!\ntx_bits: ", c);
+      for (int i = 0; i < 4; i++) fprintf(stderr, "%d ", tx_bits[i]);
+      fprintf(stderr, "%f %f\nrx_bits: ", creal(symbol), cimag(symbol));
+      for (int i = 0; i < 4; i++) fprintf(stderr, "%d ", rx_bits[i]);
+      fprintf(stderr, "%f %f\n", creal(symbol), cimag(symbol));
+      return 1;
+    }
+  }
+
+  fprintf(stderr, "%d tested OK...\nPASS!\n", c);
+  return 0;
+}