Diff: user_interface/buzzer.h

Revision:

0:371773dd3dd1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/user_interface/buzzer.h	Wed May 04 15:41:13 2011 +0000
@@ -0,0 +1,29 @@
+#ifndef BUZZER_H
+#define BUZZER_H
+#include "MCP23017.h"
+
+class buzzer {
+    MCP23017& _intf;
+    Timeout t;
+    void stop() {
+        char tmp = _intf.read(PORT_B);
+        tmp &= ~BUZZ;
+        _intf.write(PORT_B, tmp);
+    }
+public:
+    buzzer(MCP23017& intf): _intf(intf) {
+        intf.direction(PORT_B, INPUTS);// rot enc input
+        intf.configurePullUps(PORT_B, INPUTS);
+    }
+    ~buzzer() {
+        t.detach();
+        stop();
+    }
+    void buzz(int ms) {
+        char tmp = _intf.read(PORT_B);
+        tmp |= BUZZ;
+        _intf.write(PORT_B, tmp);
+        t.attach_us(this, &buzzer::stop, ms*1000);
+    }
+};
+#endif
\ No newline at end of file