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Based on some initial HAL code that was inspired by the current STM32F103 code, but with some variations that seemed to give a slightly simpler result. (Also made the old unused HAL code in STM32F303.zig compile, and marked it as 'to be moved to separate files'.)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| const std = @import("std"); | ||
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| const microzig = @import("microzig"); | ||
| const peripherals = microzig.chip.peripherals; | ||
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| pub const Mode = union(enum) { | ||
| input: InputMode, | ||
| output: OutputMode, | ||
| }; | ||
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| pub const InputMode = enum(u2) { | ||
| analog, | ||
| floating, | ||
| pull_up, | ||
| pull_down, | ||
| }; | ||
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| pub const OutputMode = enum(u2) { | ||
| push_pull, | ||
| open_drain, | ||
| }; | ||
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| // TODO: Add the following | ||
| // pub const Speed = enum(u2) { | ||
| // low, | ||
| // medium, | ||
| // high, | ||
| // }; | ||
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| pub const Pin = struct { | ||
| port_id: []const u8, | ||
| number_str: []const u8, | ||
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| pub fn init(port_id: []const u8, number_str: []const u8) Pin { | ||
| return Pin{ | ||
| .port_id = port_id, | ||
| .number_str = number_str, | ||
| }; | ||
| } | ||
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| pub fn configure(comptime self: @This()) void { | ||
| const port_peripheral = @field(peripherals, "GPIO" ++ self.port_id); | ||
| // TODO: Support input | ||
| port_peripheral.MODER.modify_one("MODER[" ++ self.number_str ++ "]", .Output); | ||
| // TODO: Support different modes, for input and for output | ||
| port_peripheral.OTYPER.modify_one("OT[" ++ self.number_str ++ "]", .PushPull); | ||
| // TODO: Support different speeds | ||
| port_peripheral.OSPEEDR.modify_one("OSPEEDR[" ++ self.number_str ++ "]", .LowSpeed); | ||
| // TODO: Support pull-up / pull-down | ||
| port_peripheral.PUPDR.modify_one("PUPDR[" ++ self.number_str ++ "]", .Floating); | ||
| } | ||
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| pub fn toggle(comptime self: @This()) void { | ||
| @field(peripherals, "GPIO" ++ self.port_id).ODR.toggle_one("ODR[" ++ self.number_str ++ "]", .High); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| const std = @import("std"); | ||
| const comptimePrint = std.fmt.comptimePrint; | ||
| const StructField = std.builtin.Type.StructField; | ||
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| const microzig = @import("microzig"); | ||
| const peripherals = microzig.chip.peripherals; | ||
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| const gpio = @import("gpio.zig"); | ||
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| /// For now this is always a GPIO pin configuration | ||
| const PinConfiguration = struct { | ||
| name: ?[:0]const u8 = null, | ||
| mode: ?gpio.Mode = null, | ||
| }; | ||
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| fn GPIO(comptime port: []const u8, comptime num: []const u8, comptime mode: gpio.Mode) type { | ||
| if (mode == .input) @compileError("TODO: implement GPIO input mode"); | ||
| return switch (mode) { | ||
| .input => struct { | ||
| const pin = gpio.Pin.init(port, num); | ||
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| pub inline fn read(_: @This()) u1 { | ||
| return pin.read(); | ||
| } | ||
| }, | ||
| .output => packed struct { | ||
| const pin = gpio.Pin.init(port, num); | ||
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| pub inline fn put(_: @This(), value: u1) void { | ||
| pin.put(value); | ||
| } | ||
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| pub inline fn toggle(_: @This()) void { | ||
| pin.toggle(); | ||
| } | ||
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| fn configure(_: @This(), pin_config: PinConfiguration) void { | ||
| _ = pin_config; // Later: use for GPIO pin speed etc. | ||
| pin.configure(); | ||
| } | ||
| }, | ||
| }; | ||
| } | ||
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| /// This is a helper empty struct with comptime constants for parsing an STM32 pin name. | ||
| /// Example: PinDescription("PE9").gpio_port_id = "E" | ||
| /// Example: PinDescription("PA12").gpio_port_number_str = "12" | ||
| fn PinDescription(comptime spec: []const u8) type { | ||
| const invalid_format_msg = "The given pin '" ++ spec ++ "' has an invalid format. Pins must follow the format \"P{Port}{Pin}\" scheme."; | ||
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| if (spec[0] != 'P') | ||
| @compileError(invalid_format_msg); | ||
| if (spec[1] < 'A' or spec[1] > 'F') | ||
| @compileError(invalid_format_msg); | ||
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| const gpio_pin_number_int: comptime_int = std.fmt.parseInt(u4, spec[2..], 10) catch @compileError(invalid_format_msg); | ||
| return struct { | ||
| /// 'A'...'F' | ||
| const gpio_port_id = spec[1..2]; | ||
| const gpio_pin_number_str = std.fmt.comptimePrint("{d}", .{gpio_pin_number_int}); | ||
| }; | ||
| } | ||
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| /// Based on the fields in `config`, returns a struct { | ||
| /// PE11: GPIO(...), | ||
| /// PF7: GPIO(...), | ||
| /// } | ||
| /// Later: Also support non-GPIO pins? | ||
| pub fn Pins(comptime config: GlobalConfiguration) type { | ||
| comptime { | ||
| var fields: []const StructField = &.{}; | ||
| for (@typeInfo(GlobalConfiguration).Struct.fields) |port_field| { | ||
| if (@field(config, port_field.name)) |port_config| { | ||
| for (@typeInfo(PortConfiguration()).Struct.fields) |field| { | ||
| if (@field(port_config, field.name)) |pin_config| { | ||
| const D = PinDescription(field.name); | ||
| fields = fields ++ &[_]StructField{.{ | ||
| .is_comptime = false, | ||
| .name = pin_config.name orelse field.name, | ||
| .type = GPIO(D.gpio_port_id, D.gpio_pin_number_str, pin_config.mode orelse .{ .input = .floating }), | ||
| .default_value = null, | ||
| .alignment = @alignOf(field.type), | ||
| }}; | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| return @Type(.{ | ||
| .Struct = .{ | ||
| .layout = .auto, | ||
| .is_tuple = false, | ||
| .fields = fields, | ||
| .decls = &.{}, | ||
| }, | ||
| }); | ||
| } | ||
| } | ||
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| /// Returns the struct { | ||
| /// PA0: ?PinConfiguration = null, | ||
| /// ... | ||
| /// PF15: ?PinConfiguration = null, | ||
| /// } | ||
| fn PortConfiguration() type { | ||
| var fields: []const StructField = &.{}; | ||
| for ("ABCDEF") |gpio_port_id| { | ||
| for (0..16) |gpio_pin_number_int| { | ||
| fields = fields ++ &[_]StructField{.{ | ||
| .is_comptime = false, | ||
| .name = std.fmt.comptimePrint("P{c}{d}", .{ gpio_port_id, gpio_pin_number_int }), | ||
| .type = ?PinConfiguration, | ||
| .default_value = &@as(?PinConfiguration, null), | ||
| .alignment = @alignOf(?PinConfiguration), | ||
| }}; | ||
| } | ||
| } | ||
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| return @Type(.{ | ||
| .Struct = .{ | ||
| .layout = .auto, | ||
| .is_tuple = false, | ||
| .fields = fields, | ||
| .decls = &.{}, | ||
| }, | ||
| }); | ||
| } | ||
| pub const GlobalConfiguration = struct { | ||
| GPIOA: ?PortConfiguration() = null, | ||
| GPIOB: ?PortConfiguration() = null, | ||
| GPIOC: ?PortConfiguration() = null, | ||
| GPIOD: ?PortConfiguration() = null, | ||
| GPIOE: ?PortConfiguration() = null, | ||
| GPIOF: ?PortConfiguration() = null, | ||
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| pub fn apply(comptime config: @This()) Pins(config) { | ||
| const pins: Pins(config) = undefined; // Later: something seems incomplete here... | ||
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| inline for (@typeInfo(@This()).Struct.fields) |port_field| { | ||
| const gpio_port_name = port_field.name; | ||
| if (@field(config, gpio_port_name)) |port_config| { | ||
| peripherals.RCC.AHBENR.modify_one(gpio_port_name ++ "EN", 1); | ||
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| inline for (@typeInfo(PortConfiguration()).Struct.fields) |pin_field| { | ||
| if (@field(port_config, pin_field.name)) |pin_config| { | ||
| @field(pins, pin_field.name).configure(pin_config); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| return pins; | ||
| } | ||
| }; |