[hdsc] HC32L110 crc16

Author: vesim987

examples/hdsc/hc32l110/build.zig

@@ -14,6 +14,7 @@ pub fn build(b: *std.Build) void {
 
     const examples: []const Example = &.{
         .{ .name = "blinky", .file = "src/blinky.zig" },
+        .{ .name = "crc16", .file = "src/crc16.zig" },
     };
 
     for (examples) |example| {

examples/hdsc/hc32l110/src/crc16.zig

@@ -0,0 +1,17 @@
+const std = @import("std");
+const microzig = @import("microzig");
+const hal = microzig.hal;
+const time = hal.time;
+const crc16 = hal.crc16;
+
+pub fn main() !void {
+    hal.clock.gate.enable(.Crc);
+
+    const value = crc16.calculate(u8, &.{ 0xDE, 0xAD, 0xBE, 0xEF });
+    if (value != 0xE5CB) @panic("invalid value");
+
+    if (!crc16.check(u8, &.{ 0xDE, 0xAD, 0xBE, 0xEF }, 0xE5CB))
+        @panic("invalid value");
+
+    while (true) {}
+}

port/hdsc/hc32l110/README.md

@@ -6,7 +6,7 @@ HAL and register definitions for the HC32L110 family of microcontrollers
 - [ ] adc
 - [ ] adt
 - [-] clocks
-- [ ] crc
+- [x] crc
 - [ ] flash
 - [x] gpio
 - [ ] i2c

port/hdsc/hc32l110/src/hal/crc16.zig

@@ -0,0 +1,32 @@
+const std = @import("std");
+const microzig = @import("microzig");
+const chip = microzig.chip;
+
+const CRC = chip.peripherals.CRC;
+
+pub fn calculate(T: type, data: []const T) u16 {
+    switch (T) {
+        u8, u16, u32 => {},
+        else => @compileError("unsupported type"),
+    }
+
+    CRC.RESULT.write(.{ .RESULT = 0xffff, .FLAG = 0 });
+
+    const ptr: *volatile T = @ptrCast(&CRC.DATA);
+    for (data) |d| {
+        ptr.* = d;
+    }
+
+    return CRC.RESULT.read().RESULT;
+}
+
+pub fn check(T: type, data: []const T, value: u16) bool {
+    CRC.RESULT.write(.{ .RESULT = value, .FLAG = 0 });
+
+    const ptr: *volatile T = @ptrCast(&CRC.DATA);
+    for (data) |d| {
+        ptr.* = d;
+    }
+
+    return CRC.RESULT.read.FLAG;
+}