fixed bugs and revolutionized the universe

1 files changed, 51 insertions, 3 deletions

diff --git a/ROMs/hello_c.c b/ROMs/hello_c.c
index f670952..9cf7a96 100644
--- a/ROMs/hello_c.c
+++ b/ROMs/hello_c.c
@@ -1,7 +1,55 @@
+#include "ROMs/font.bin"
+
+int drawChar(int ch, int x, int y, int color)
+{
+    // adjust for jmp instruction
+    char* fontStart = 0x1FFF + 2;
+    int charStart = ch * 8;
+
+    for (int yOff = 0; yOff < 8; yOff++)
+    {
+        int row = fontStart[charStart + yOff];
+
+        for (int xOff = 0; xOff < 8; xOff++)
+        {
+            int bit = (row >> (7 - xOff)) & 1;
+            int pix = bit ? 0 : color;
+            setPixel(x + xOff, y + yOff, pix);
+        }
+    }
+}
+
+int setPixel(int x, int y, int c)
+{
+    char* screenStart = 0x402F;
+    int i = (y * 128) + x;
+    screenStart[i] = c;
+}
+
+int clear(int c)
+{
+    char* screenStart = 0x402F;
+    char screenSize = 64 * 128;
+    for (int i = 0; i < screenSize; i++)
+    {
+        screenStart[i] = c;
+    }
+}
+
 int main() 
 {
-    int x = 1;
-    for (int i = 0; i < 10; i++) {
-        x *= 2;
+    int color = 1;
+    int* text = "HELLO WORLD!";
+    int len = 12;
+
+    clear(0);
+    while (1)
+    {
+        for (int i = 0; i < len; i++)
+        {
+            int ch = text[i];
+            drawChar(ch, i * 8, 0, color);
+        }
+        color++;
     }
 }
\ No newline at end of file