1 files changed, 42 insertions, 0 deletions
diff --git a/delay.c b/delay.c
new file mode 100755
index 0000000..05960e6
--- /dev/null
+++ b/delay.c
@@ -0,0 +1,42 @@
+/**
+ * @file delay.c
+ * Delay support using a timer.
+ *
+ * Copyright (C) 2019  Clyne Sullivan
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "board.h"
+
+volatile unsigned int delayTicks = 0;
+
+void delayInit(void)
+{
+	TACCTL0 |= CCIE;
+	TACCR0 = 128;
+	TACTL |= TASSEL_2 | MC_1 | ID_3;
+}
+
+void delay(unsigned int ms)
+{
+    unsigned int target = delayTicks + ms;
+    while (delayTicks < target);
+}
+
+__attribute__((__interrupt__(TIMER0_A0_VECTOR)))
+static void delayInterruptHandler(void)
+{
+    delayTicks++;
+}