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Diffstat (limited to 'n/asserv/src/dsp_check2.c')
-rw-r--r--n/asserv/src/dsp_check2.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/n/asserv/src/dsp_check2.c b/n/asserv/src/dsp_check2.c
new file mode 100644
index 0000000..76d5cfe
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+++ b/n/asserv/src/dsp_check2.c
@@ -0,0 +1,90 @@
+/* dsp_check2.c - check dsp algorithms. */
+/* asserv - Position & speed motor control on a ATmega128. {{{
+ *
+ * Copyright (C) 2004 Nicolas Schodet
+ *
+ * Robot APB Team/Efrei 2005.
+ * Web: http://assos.efrei.fr/robot/
+ * Email: robot AT efrei DOT fr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * }}} */
+#include <stdio.h>
+
+/* +AutoDec */
+/* -AutoDec */
+
+static int failled = 0;
+
+void
+check_mul_f824 (int a, int b, int r)
+{
+ long long m = ((long long) a * b) >> 24;
+ if (m > (1LL << 31) - 1 || m < -(1LL << 31))
+ printf ("overflow %d * %d = %d (%Ld)", a, b, r, m);
+ else if (m == r)
+ printf ("pass %d * %d = %d", a, b, r);
+ else
+ {
+ printf ("fail %d * %d = %d (%Ld)", a, b, r, m);
+ failled = 1;
+ }
+ printf (" | %08x %08x %08x\n", a, b, r);
+}
+
+int
+get (int c, int *v)
+{
+ int ret;
+ char cs;
+ ret = scanf (" %c", &cs);
+ if (ret != 1 || cs != c)
+ return 0;
+ ret = scanf (" %d", v);
+ return ret == 1;
+}
+
+int
+main (void)
+{
+ int incomplete = 0;
+ int a, b, r1, r2, r3, r4;
+ while (!feof (stdin))
+ {
+ if (get ('A', &a) && get ('B', &b) && get ('r', &r1) && get ('r', &r2)
+ && get ('r', &r3) && get ('r', &r4))
+ {
+ check_mul_f824 (a, b, r1);
+ check_mul_f824 (-a, b, r2);
+ check_mul_f824 (a, -b, r3);
+ check_mul_f824 (-a, -b, r4);
+ }
+ else if (!feof (stdin))
+ incomplete++;
+ }
+ if (incomplete)
+ printf ("%d incomplete tests\n", incomplete);
+ if (failled)
+ {
+ printf ("test failled\n");
+ return 1;
+ }
+ else
+ {
+ printf ("test passed\n");
+ return 0;
+ }
+}