rp2xxx: ssd1306 oled display example

examples/raspberrypi/rp2xxx/build.zig.zon

@@ -4,6 +4,10 @@
     .version = "0.0.0",
     .dependencies = .{
         .microzig = .{ .path = "../../.." },
+        .font8x8 = .{
+            .url = "git+https://github.com/Gnyblast/zig-ssd1306-gddram-fonts#84dd5fab70ddc1198eef1cd1305cc82f08f419dc",
+            .hash = "ssd1306_font_8x8-0.0.0-oGb_cERcAAA6NJzWDOMepgnY6r4blNEHjpkldDaRAui5",
+        },
     },
     .paths = .{
         "README.md",

examples/raspberrypi/rp2xxx/src/ssd1306_oled.zig

@@ -0,0 +1,84 @@
+const std = @import("std");
+const microzig = @import("microzig");
+const rp2xxx = microzig.hal;
+const time = rp2xxx.time;
+const gpio = rp2xxx.gpio;
+const i2c = rp2xxx.i2c;
+const font8x8 = @import("font8x8");
+
+// Compile-time pin configuration
+const pin_config = rp2xxx.pins.GlobalConfiguration{
+    .GPIO8 = .{
+        .name = "SDA",
+        .function = .I2C0_SDA,
+        .schmitt_trigger = .enabled,
+        .slew_rate = .slow,
+        .pull = .up,
+        .direction = .out,
+    },
+    .GPIO9 = .{
+        .name = "SCL",
+        .function = .I2C0_SCL,
+        .schmitt_trigger = .enabled,
+        .slew_rate = .slow,
+        .pull = .up,
+        .direction = .out,
+    },
+};
+
+const i2c0 = i2c.instance.num(0);
+const lcd_address = rp2xxx.i2c.Address.new(0x3C);
+const empty_row: []const u8 = "                ";
+const four_rows = empty_row ++ empty_row ++ empty_row ++ empty_row;
+
+pub fn main() void {
+    var backinf_buffer: [200 * 1024]u8 = undefined;
+    var fba = std.heap.FixedBufferAllocator.init(&backinf_buffer);
+
+    pin_config.apply();
+    rp2xxx.i2c.I2C.apply(i2c0, .{ .baud_rate = 400_000, .clock_config = rp2xxx.clock_config });
+
+    const I2C_DEVICE = rp2xxx.drivers.I2C_Device.init(i2c0, lcd_address, null);
+    const lcd = microzig.drivers.display.ssd1306.init(.i2c, I2C_DEVICE, null) catch unreachable;
+
+    const print_val = four_rows ++ "    WELCOME!";
+    var buff: [print_val.len * 8]u8 = undefined;
+
+    lcd.clear_screen(false) catch unreachable;
+    lcd.write_gdram(font8x8.Fonts.draw(&buff, print_val)) catch unreachable;
+
+    time.sleep_ms(2000);
+
+    var counter: u8 = 0;
+    while (true) : (time.sleep_ms(1000)) {
+        var allocator = fba.allocator();
+        var temp_buf: [7]u8 = undefined;
+        const str = std.fmt.bufPrint(&temp_buf, "Try #{}", .{ counter }) catch unreachable;
+        var counter_buf: [80]u8 = undefined;
+        const text_centered = center(&counter_buf, str);
+
+        const text = font8x8.Fonts.drawAlloc(allocator, text_centered) catch continue;
+        defer allocator.free(text);
+
+        lcd.clear_screen(false) catch continue;
+        lcd.write_gdram(text) catch continue;
+
+        counter += 1;
+        time.sleep_ms(1000);
+        if (counter > 59)
+            break;
+    }
+}
+
+fn center(buf: []u8, str: []u8) []u8 {
+    const to_be_added = @divTrunc(16 - str.len, 2);
+    @memcpy(buf[0..64], four_rows);
+    for (0..to_be_added) |i| {
+        @memcpy(buf[(64 + i)..(64 + i + 1)], " ");
+    }
+    @memcpy(buf[(64 + to_be_added)..(64 + to_be_added + str.len)], str);
+    for ((64 + str.len + to_be_added)..buf.len) |i| {
+        @memcpy(buf[i..(i + 1)], " ");
+    }
+    return buf;
+}