12 files changed, 54 insertions, 14 deletions

diff --git a/include/07.pit/pit00.c b/include/07.pit/deo1
index 13fd550..13fd550 100644
--- a/include/07.pit/pit00.c
+++ b/include/07.pit/deo1
diff --git a/include/07.pit/deo10 b/include/07.pit/deo10
new file mode 100644
index 0000000..208a223
--- /dev/null
+++ b/include/07.pit/deo10
@@ -0,0 +1,4 @@
+    // Send the frequency divisor.
+    ioport_out(0x40, l);
+    ioport_out(0x40, h);
+}
diff --git a/include/07.pit/deo2 b/include/07.pit/deo2
new file mode 100644
index 0000000..dfa7284
--- /dev/null
+++ b/include/07.pit/deo2
@@ -0,0 +1 @@
+void add_idt_entry(size_t num,uint32_t offset);
diff --git a/include/07.pit/pit01.c b/include/07.pit/deo3
index c199373..025eb31 100644
--- a/include/07.pit/pit01.c
+++ b/include/07.pit/deo3
@@ -1,4 +1,3 @@
-void add_idt_entry(size_t num,uint32_t offset);
 uint32_t tick=0;
 const uint32_t TICKS_PER_SECOND=50;
 extern uint32_t time;
diff --git a/include/07.pit/deo4 b/include/07.pit/deo4
new file mode 100644
index 0000000..8eba051
--- /dev/null
+++ b/include/07.pit/deo4
@@ -0,0 +1,9 @@
+void timer_handler()
+{
+    tick++;
+    if(tick==TICKS_PER_SECOND)
+    {
+        //printf("%d seconds passed\n",time);
+        tick=0;
+        time++;
+    }
diff --git a/include/07.pit/deo5 b/include/07.pit/deo5
new file mode 100644
index 0000000..eaf7bcf
--- /dev/null
+++ b/include/07.pit/deo5
@@ -0,0 +1,3 @@
+    ioport_out(0x20, 0x20);
+    ioport_out(0xa0,0x20);
+}
diff --git a/include/07.pit/deo6 b/include/07.pit/deo6
new file mode 100644
index 0000000..12cee6a
--- /dev/null
+++ b/include/07.pit/deo6
@@ -0,0 +1,3 @@
+void init_timer(uint32_t frequency)
+{
+    // Firstly, register our timer callback.
diff --git a/include/07.pit/deo7 b/include/07.pit/deo7
new file mode 100644
index 0000000..c780ebc
--- /dev/null
+++ b/include/07.pit/deo7
@@ -0,0 +1,4 @@
+    // The value we send to the PIT is the value to divide it's input clock
+    // (1193180 Hz) by, to get our required frequency. Important to note is
+    // that the divisor must be small enough to fit into 16-bits.
+    uint32_t divisor = 1193180 / frequency;
diff --git a/include/07.pit/deo8 b/include/07.pit/deo8
new file mode 100644
index 0000000..8c64aaf
--- /dev/null
+++ b/include/07.pit/deo8
@@ -0,0 +1,2 @@
+    // Send the command byte.
+    ioport_out(0x43, 0x36);
diff --git a/include/07.pit/deo9 b/include/07.pit/deo9
new file mode 100644
index 0000000..1deca04
--- /dev/null
+++ b/include/07.pit/deo9
@@ -0,0 +1,3 @@
+    // Divisor has to be sent byte-wise, so split here into upper/lower bytes.
+    uint8_t l = (uint8_t)(divisor & 0xFF);
+    uint8_t h = (uint8_t)( (divisor>>8) & 0xFF );
diff --git a/include/07.pit/pit02.c b/include/07.pit/pit02.c
deleted file mode 100644
index 523d14b..0000000
--- a/include/07.pit/pit02.c
+++ /dev/null
@@ -1,13 +0,0 @@
-void timer_handler()
-{
-    tick++;
-    if(tick==TICKS_PER_SECOND)
-    {
-	//printf("%d seconds passed\n",time);
-	tick=0;
-	time++;
-    }
-
-    ioport_out(0x20, 0x20);
-    ioport_out(0xa0,0x20);
-}
diff --git a/include/07.pit/pit03.c b/include/07.pit/timer.c
index 287adba..390e512 100644
--- a/include/07.pit/pit03.c
+++ b/include/07.pit/timer.c
@@ -1,3 +1,28 @@
+#include<types.h>
+#include<asm.h>
+#include<stdio.h>
+
+void add_idt_entry(size_t num,uint32_t offset);
+
+uint32_t tick=0;
+const uint32_t TICKS_PER_SECOND=50;
+extern uint32_t time;
+uint32_t time=0;
+
+void timer_handler()
+{
+    tick++;
+    if(tick==TICKS_PER_SECOND)
+    {
+        //printf("%d seconds passed\n",time);
+        tick=0;
+        time++;
+    }
+
+    ioport_out(0x20, 0x20);
+    ioport_out(0xa0,0x20);
+}
+
 void init_timer(uint32_t frequency)
 {
     // Firstly, register our timer callback.