CTAOS v1

timer.c

@@ -0,0 +1,52 @@
+#include<system.h>
+int timer_ticks = 0;
+int timer_hz;
+
+void timer_phase(int hz)
+{
+      int divisor = 1193180/hz;           // Calculate the divisor
+      outportb(0x43, 0x36);               // Set our command byte 0x36
+      outportb(0x40, divisor&0xFF);       // Set low byte
+      outportb(0x40, divisor>>8);         // Set high byte
+      timer_hz = hz;
+}
+
+void timer_clock (int x, int y, int secs)
+{
+      int s, m, h;
+      char arr[9] = {0,0,0,0,0,0,0,0,0};
+      
+      s = secs%60;
+      m = (secs/60)%60;
+      h = secs/3600;
+      
+      arr[0] = (h/10)%10 + '0'; if (arr[0]=='0') arr[0] = ' ';
+      arr[1] = h%10 + '0';
+      
+      arr[3] = (m/10) + '0';
+      arr[4] = m%10 + '0';
+      
+      arr[6] = s/10 + '0';
+      arr[7] = s%10 + '0';
+      
+      if (secs%2 == 0) {
+            arr[2] = ' ';
+            arr[5] = ' ';
+            }
+      else {
+            arr[2] = ':';
+            arr[5] = ':';
+            }
+            
+      puts_pos(x, y, arr);
+}
+
+
+void timer_handler(regs *r)
+{
+      timer_ticks++;
+      
+      if (timer_ticks % timer_hz) {
+            timer_clock (70, 0, timer_ticks / timer_hz);
+      }
+}