blinky

flake.nix

@@ -15,7 +15,7 @@
       zls = pkgs.zls;
     in {
       devShells.${system}.default = pkgs.mkShell {
-        buildInputs = [ zig zls ];
+        buildInputs = [ zig zls pkgs.openocd ];
         shellHook = ''
           echo "Entering Zig Master Environment"
           echo "Zig: $(zig version)"

tiva/build.zig

@@ -20,7 +20,7 @@ pub fn build(b: *std.Build) void {
     const cmsis_path = "/home/priec/programs/CMSIS";
 
     // Generic CMSIS Core (for core_cm4.h)
-    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/CMSIS/Include" });
+    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/Include" });
     // TM4C Device Specific (for TM4C123GH6PM.h)
     tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/Device/TI/TM4C/Include" });
 

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");
+    }
 }