blinky

tiva/src/main.zig

@@ -1,7 +1,31 @@
 const cmsis = @cImport({
+    @cDefine("TM4C123GH6PM", "");
     @cInclude("TM4C123GH6PM.h");
 });
 
+const GPIO_PORTF_CLK_EN: u32 = 0x20;  // Bit 5 (Port F)
+const GPIO_PORTF_PIN1_EN: u32 = 0x02; // Bit 1
+
+const LED_ON1: u32 = 0x02;
+
 export fn _start() noreturn {
-    while (true) {}
+    cmsis.SYSCTL.*.RCGCGPIO |= GPIO_PORTF_CLK_EN;
+    _ = cmsis.SYSCTL.*.RCGCGPIO;
+
+    cmsis.GPIOF.*.DEN |= GPIO_PORTF_PIN1_EN;
+    cmsis.GPIOF.*.DIR |= GPIO_PORTF_PIN1_EN;
+
+    const DELAY_VALUE = 4000000;
+    while (true) {
+        cmsis.GPIOF.*.DATA = LED_ON1; // LED On
+        Delay(DELAY_VALUE);
+        cmsis.GPIOF.*.DATA = 0; // LED On
+        Delay(DELAY_VALUE);
+    }
+}
+
+fn Delay(delay: usize) void{
+    for(0..delay) |_| {
+        asm volatile ("nop");
+    }
 }