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const registers = packed struct {
moder: u32,
otyper: u32,
ospeedr: u32,
pupdr: u32,
idr: u32,
odr: u32,
bsrr: u32,
lckr: u32,
afr: u64,
brr: u32,
ascr: u32,
};
const driver = struct {
port: *registers,
const mode = enum(u32) {
alternate_0 = 0,
alternate_1,
alternate_2,
alternate_3,
alternate_4,
alternate_5,
alternate_6,
alternate_7,
alternate_8,
alternate_9,
alternate_10,
alternate_11,
alternate_12,
alternate_13,
alternate_14,
alternate_15,
input,
output,
analog,
};
pub fn set_mode(self: driver, pin: u4, m: mode) void {
const offset = 2 * @as(u5, pin);
const moder = self.port.moder & ~(@as(u32, 3) << offset);
const mask: u32 = switch (m) {
.input => 0,
.output => 1,
.analog => 3,
else => 2,
};
self.port.moder = moder | (mask << offset);
if (mask == 2) {
const afr_offset = (4 * @as(u6, pin));
const afr = self.port.afr & ~(@as(u64, 0xF) << afr_offset);
self.port.afr = afr | (@as(u64, @intFromEnum(m)) << afr_offset);
}
}
pub fn toggle(self: driver, pin: u4) void {
self.port.odr ^= @as(u32, 1) << pin;
}
pub fn set(self: driver, pin: u4) void {
self.port.odr |= @as(u32, 1) << pin;
}
pub fn clear(self: driver, pin: u4) void {
self.port.odr &= ~(@as(u32, 1) << pin);
}
pub fn write(self: driver, pin: u4, val: bool) void {
if (val) {
self.set(pin);
} else {
self.clear(pin);
}
}
pub fn read(self: driver, pin: u4) bool {
return (self.port.idr & @as(u32, 1) << pin) != 0;
}
};
pub const gpioa = driver { .port = @ptrFromInt(0x48000000) };
pub const gpiob = driver { .port = @ptrFromInt(0x48000400) };
pub const gpioc = driver { .port = @ptrFromInt(0x48000800) };
pub const gpiod = driver { .port = @ptrFromInt(0x48000C00) };
pub const gpioe = driver { .port = @ptrFromInt(0x48001000) };
pub const gpiof = driver { .port = @ptrFromInt(0x48001400) };
pub const gpiog = driver { .port = @ptrFromInt(0x48001800) };
pub const gpioh = driver { .port = @ptrFromInt(0x48001C00) };
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