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//! By convention, main.zig is where your main function lives in the case that
//! you are building an executable. If you are making a library, the convention
//! is to delete this file and start with root.zig instead.
//const std = @import("std");
const gpio = packed struct {
moder: u32,
otyper: u32,
ospeedr: u32,
pupdr: u32,
idr: u32,
odr: u32,
bsrr: u32,
lckr: u32,
afrl: u32,
afrh: u32,
brr: u32,
ascr: u32,
};
const cpu = struct {
pub fn interrupt_disable() void {
asm volatile("cpsid i");
}
pub fn interrupt_enable() void {
asm volatile("cpsie i");
}
};
const gpioa: *gpio = @ptrFromInt(0x48000000);
const rcc: *[39]u32 = @ptrFromInt(0x40021000);
export fn _start() callconv(.C) noreturn {
cpu.interrupt_disable();
rcc[19] |= 1; // gpioaen
gpioa.moder &= ~@as(u32, 0x3 << (5 * 2));
gpioa.moder |= (1 << (5 * 2));
while (true) {
gpioa.odr ^= (1 << 5);
}
}
export fn fault_handler() callconv(.C) void {
while (true) {}
}
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