port: ch32v: Add support for ch32v307

Add support for the CH32V307 microcontroller to port, including target
and board definitions, and new source files for the CH32V307 board and
HAL. This enables building firmware for the CH32V307 microcontroller and
its associated board.

Signed-off-by: Junhui Liu <[email protected]>

port/wch/ch32v/build.zig

@@ -11,6 +11,7 @@ chips: struct {
     ch32v103x8: *const microzig.Target,
     ch32v203x6: *const microzig.Target,
     ch32v203x8: *const microzig.Target,
+    ch32v307xc: *const microzig.Target,
 },
 
 boards: struct {
@@ -23,6 +24,9 @@ boards: struct {
     ch32v203: struct {
         suzuduino_uno_v1b: *const microzig.Target,
     },
+    ch32v307: struct {
+        ch32v307v_r1_1v0: *const microzig.Target,
+    },
 },
 
 pub fn init(dep: *std.Build.Dependency) Self {
@@ -37,6 +41,9 @@ pub fn init(dep: *std.Build.Dependency) Self {
     const hal_ch32v203: microzig.HardwareAbstractionLayer = .{
         .root_source_file = b.path("src/hals/hal_ch32v203.zig"),
     };
+    const hal_ch32v307: microzig.HardwareAbstractionLayer = .{
+        .root_source_file = b.path("src/hals/hal_ch32v307.zig"),
+    };
 
     const qingkev2a = .{
         // QingKe V2C is RV32EC
@@ -77,6 +84,20 @@ pub fn init(dep: *std.Build.Dependency) Self {
         .abi = .eabi,
     };
 
+    const qingkev4f = .{
+        .cpu_arch = .riscv32,
+        .cpu_model = .{ .explicit = &std.Target.riscv.cpu.generic_rv32 },
+        // generic_rv32 has feature I.
+        .cpu_features_add = std.Target.riscv.featureSet(&.{
+            std.Target.riscv.Feature.c,
+            std.Target.riscv.Feature.a,
+            std.Target.riscv.Feature.m,
+            std.Target.riscv.Feature.f,
+        }),
+        .os_tag = .freestanding,
+        .abi = .eabi,
+    };
+
     const chip_ch32v003x4: microzig.Target = .{
         .dep = dep,
         .preferred_binary_format = .bin,
@@ -168,6 +189,30 @@ pub fn init(dep: *std.Build.Dependency) Self {
         .hal = hal_ch32v203,
     };
 
+    const chip_ch32v307xc = microzig.Target{
+        .dep = dep,
+        .preferred_binary_format = .bin,
+        .chip = .{
+            .name = "CH32V30xxx", // <name/> from SVD
+            .cpu = qingkev4f,
+            .cpu_module_file = b.path("src/cpus/qingkev4-rv32imac.zig"),
+            .memory_regions = &.{
+                // FLASH + RAM supports the following configuration
+                // FLASH-192K + RAM-128K
+                // FLASH-224K + RAM-96K
+                // FLASH-256K + RAM-64K
+                // FLASH-288K + RAM-32K
+                // FLASH-128K + RAM-192K
+                .{ .offset = 0x08000000, .length = 128 * KiB, .kind = .flash },
+                .{ .offset = 0x20000000, .length = 32 * KiB, .kind = .ram },
+            },
+            .register_definition = .{
+                .svd = b.path("src/chips/ch32v30x.svd"),
+            },
+        },
+        .hal = hal_ch32v307,
+    };
+
     const board_ch32v003f4p6_r0_1v1 = chip_ch32v003x4.derive(.{
         .board = .{
             .name = "WCH CH32V003F4P6-R0-1v1",
@@ -192,13 +237,22 @@ pub fn init(dep: *std.Build.Dependency) Self {
         },
     });
 
+    const board_ch32v307v_r1_1v0 = chip_ch32v307xc.derive(.{
+        .board = .{
+            .name = "WCH CH32V307V-R1-1V0",
+            .url = "https://github.com/openwch/ch32v307/tree/main/SCHPCB/CH32V307V-R1-1v0",
+            .root_source_file = b.path("src/boards/CH32V307V-R1-1v0.zig"),
+        },
+    });
+
     return .{
         .chips = .{
             .ch32v003x4 = chip_ch32v003x4.derive(.{}),
             .ch32v103x6 = chip_ch32v103x6.derive(.{}),
             .ch32v103x8 = chip_ch32v103x8.derive(.{}),
             .ch32v203x6 = chip_ch32v203x6.derive(.{}),
             .ch32v203x8 = chip_ch32v203x8.derive(.{}),
+            .ch32v307xc = chip_ch32v307xc.derive(.{}),
         },
 
         .boards = .{
@@ -211,6 +265,9 @@ pub fn init(dep: *std.Build.Dependency) Self {
             .ch32v203 = .{
                 .suzuduino_uno_v1b = board_suzuduino_uno_v1b,
             },
+            .ch32v307 = .{
+                .ch32v307v_r1_1v0 = board_ch32v307v_r1_1v0,
+            },
         },
     };
 }

port/wch/ch32v/src/boards/CH32V307V-R1-1v0.zig

@@ -0,0 +1,6 @@
+// CH32V307V_MINI
+// CH32V307
+pub const chip = @import("chip");
+pub const micro = @import("microzig");
+
+pub const cpu_frequency = 8_000_000; // 8 MHz

port/wch/ch32v/src/hals/hal_ch32v307.zig

@@ -0,0 +1,4 @@
+pub const pins = @import("pins.zig");
+pub const gpio = @import("gpio.zig");
+
+// pub fn init() void {}