Integrates driver framework (#246)

* Initial commit

* Initial commit: Keyboard and SSD1306 driver and some basic project structure.

* Introduces StreamDevice and DatagramDevice for the framework as a reference type

* Introduces DigitalIO as a base driver and ports KeyboardMatrix to it.

* Starts implementing the ST77xx driver

* Adjusts to ZEG coding guidelines

* Updates README.md

* Adds some minor fixes.

* Update to 0.13.0

* Updates DigitalIO to make .read() may error (think: port expanders!), fixes some details in rotary-encoder and debounced-button

* Adds a framebuffer type for the SSD1306

* Fixes some bugs in the SSD1306 driver, enables quicker image transfer.

* Removes pre-merge cruft

* Adds missing build.zig

* Applies style guides more thoroughly

* Deletes empty driver files

* Refactors Keyboard_Matrix

* Refactors Debounced_Button

* Refactors Rotary_Encoder

* Renames ./driver to ./drivers, adds the drivers package to '@import(microzig).drivers' so it's exposed in the framework by default.

* Adds README to ./drivers

* Adds missing build.zig.zon to driver framework.

* Renames project to work around bug in boxzer

* Ports SSD1306 and Datagram_Device to use/provide writev/readv functions

* Prepares SSD1306 to be used with 4-wire SPI

* Updates Stream_Device to provide writev/readv

* Adds a unit test for the Datagram_Device.Test_Device

* Implements Stream_Device.Test_Device with a unit test to ensure proper function.

* Enables SSD1306 with 4-wire SPI mode.

* Starts to implement device drivers for RP2 HAL

* Adds rp2.hal.GPIO_Device as a Digital_IO driver

* Introduces the SSD1306 dynamic mode support, which can serve all other modes at runtime

* Drops accidential file clone

* Attempts to fix boxzer CI failure

---------

Co-authored-by: Felix (xq) Queißner <git@random-projects.net>

Author: ikskuh

.gitignore

@@ -1,11 +1,11 @@
-zig-out/
-zig-cache/
-.zig-cache/
-microzig-deploy/
+__pycache__/
+.direnv/
 .DS_Store
 .gdbinit
 .lldbinit
-.direnv/
-__pycache__/
 .venv
+.zig-cache/
 boxzer-out
+microzig-deploy/
+zig-cache/
+zig-out/

build/build.zig

@@ -2,6 +2,7 @@
 host_build: *Build,
 self: *Build.Dependency,
 microzig_core: *Build.Dependency,
+drivers_dep: *Build.Dependency,
 generate_linkerscript: *Build.Step.Compile,
 
 const std = @import("std");
@@ -48,12 +49,14 @@ pub fn init(b: *Build, opts: struct {
 }) *MicroZig {
     const mz_dep = b.dependency(opts.dependency_name, .{});
     const core_dep = mz_dep.builder.dependency("microzig/core", .{});
+    const drivers_dep = mz_dep.builder.dependency("microzig/drivers", .{});
     const ret = b.allocator.create(MicroZig) catch @panic("OOM");
     ret.* =
         MicroZig{
         .host_build = b,
         .self = mz_dep,
         .microzig_core = core_dep,
+        .drivers_dep = drivers_dep,
         .generate_linkerscript = mz_dep.builder.addExecutable(.{
             .name = "generate-linkerscript",
             .root_source_file = .{ .cwd_relative = comptime root() ++ "/src/generate_linkerscript.zig" },
@@ -146,6 +149,10 @@ pub fn add_firmware(
                         .name = "config",
                         .module = micro_build.createModule(.{ .root_source_file = config.getSource() }),
                     },
+                    .{
+                        .name = "drivers",
+                        .module = mz.drivers_dep.module("drivers"),
+                    },
                 },
             }),
             .cpu = undefined,

build/build.zig.zon

@@ -14,6 +14,9 @@
         .@"microzig/build/definitions" = .{
             .path = "definitions",
         },
+        .@"microzig/drivers" = .{
+            .path = "../drivers",
+        },
     },
 
     .paths = .{

core/src/drivers.zig

@@ -31,10 +31,12 @@ pub const hal = if (config.has_hal) @import("hal") else void;
 /// Provides access to board features or is `void` when no board is present.
 pub const board = if (config.has_board) @import("board") else void;
 
+/// Contains device-independent drivers for peripherial devices.
+pub const drivers = @import("drivers");
+
 pub const mmio = @import("mmio.zig");
 pub const interrupt = @import("interrupt.zig");
 pub const core = @import("core.zig");
-pub const drivers = @import("drivers.zig");
 pub const utilities = @import("utilities.zig");
 
 /// The microzig default panic handler. Will disable interrupts and loop endlessly.

core/src/drivers/experimental.zig

@@ -0,0 +1,20 @@
+# microzig-driver-framework
+
+A collection of device drivers for the use with MicroZig.
+
+## Drivers
+
+> Drivers with a checkmark are already implemented, drivers without are missing
+
+- Input
+  - [x] Keyboard Matrix
+  - [x] Rotary Encoder
+  - [x] Debounced Button
+  - Touch
+    - [ ] [XPT2046](https://github.com/ZigEmbeddedGroup/microzig/issues/247)
+- Display
+  - [x] SSD1306 (I²C works, [3-wire SPI](https://github.com/ZigEmbeddedGroup/microzig/issues/251) and [4-wire SPI](https://github.com/ZigEmbeddedGroup/microzig/issues/252) are missing)
+  - [ ] [ST7735](https://github.com/ZigEmbeddedGroup/microzig/issues/250) (WIP)
+  - [ ] [ILI9488](https://github.com/ZigEmbeddedGroup/microzig/issues/249)
+- Wireless
+  - [ ] [SX1276, SX1278](https://github.com/ZigEmbeddedGroup/microzig/issues/248)