adding Zig examples

EXAMPLES_Zig/lcd_i2c.zig

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+// Usage example of the JETGPIO library
+// Compile with: zig build-exe lcd_i2c.zig -ljetgpio -lc
+// Execute with: sudo ./lcd_i2c
+
+const std = @import("std");
+const jetgpio = @cImport({
+    @cInclude("jetgpio.h");
+});
+
+fn send_command(handle: u32, i2cAddr: u32, command: u32) void {
+    var buffer: u32 = command & 0xF0;
+    buffer |= 0x04;
+    var buffer2: u32 = buffer;
+    buffer |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer, 0x0);
+    std.time.sleep(2000000);
+    buffer2 &= 0xFB;
+    buffer2 |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer2, 0x0);
+    buffer = (command & 0x0F) << 4;
+    buffer |= 0x04;
+    buffer2 = buffer;
+    buffer |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer, 0x0);
+    std.time.sleep(2000000);
+    buffer2 &= 0xFB;
+    buffer2 |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer2, 0x0);
+}
+
+fn send_data(handle: u32, i2cAddr: u32, data: u32) void {
+    var buffer: u32 = data & 0xF0;
+    buffer |= 0x05;
+    var buffer2: u32 = buffer;
+    buffer |= 0x08;
+    buffer2 &= 0xFB;
+    buffer2 |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer, buffer2);
+    buffer = (data & 0x0F) << 4;
+    buffer |= 0x05;
+    buffer2 = buffer;
+    buffer |= 0x08;
+    buffer2 &= 0xFB;
+    buffer2 |= 0x08;
+    _ = jetgpio.i2cWriteByteData(handle, i2cAddr, buffer, buffer2);
+}
+
+pub fn main() !void {
+    const LCD_SLAVE_ADDRESS: u32 = 0x3f;
+    std.debug.print("This will print something on the LCD and it will stay until LCD reset\n", .{});
+
+    const init = jetgpio.gpioInitialise();
+    if (init < 0) {
+        std.debug.print("Error initiating jetgpio, erro number: {}\n", .{init});
+    }
+
+    const lcd: i32 = jetgpio.i2cOpen(1, 0);
+    if (lcd < 0) {
+        std.debug.print("Error opening i2c port, error number: {}\n", .{lcd});
+    }
+
+    // Now setting stuff up, device has not register map, all characters are sent as is, not to a specific register address
+    // the trick here is to send the same stuff twice for commands and for characters just once and then a 0, which does nothing
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x33);
+    std.time.sleep(5000000);
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x32);
+    std.time.sleep(5000000);
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x28);
+    std.time.sleep(5000000);
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x0C);
+    std.time.sleep(5000000);
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x01);
+    std.time.sleep(5000000);
+    _ = jetgpio.i2cWriteByteData(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x08, 0x0);
+
+    //Now can start writing to the lcd screen, starting at position 0,0 first line ot the left
+
+    const message = "Jetgpio";
+    const message2 = " by Rubberazer";
+
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0x80); //Positioning cursor at point 0,0
+    for (message) |i| {
+        send_data(@intCast(lcd), LCD_SLAVE_ADDRESS, i);
+    }
+
+    send_command(@intCast(lcd), LCD_SLAVE_ADDRESS, 0xC0); //Positioning cursor at second line
+    for (message2) |i| {
+        send_data(@intCast(lcd), LCD_SLAVE_ADDRESS, i);
+    }
+    // Closing i2c connection
+    _ = jetgpio.i2cClose(@intCast(lcd));
+    jetgpio.gpioTerminate();
+}