Move I2C into a separate component.

esp/cpp/components/i2c/include/i2c.h

@@ -0,0 +1,66 @@
+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2025 Shaun Reed, all rights reserved               ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com                     ##
+##############################################################################
+*/
+#ifndef I2C_H
+#define I2C_H
+
+#define I2C_BUS_PORT  0
+
+#include <esp_log.h>
+#include <driver/i2c_master.h>
+
+/// Tag used for ESP logging.
+static const char* TAG = "I2C component";
+
+/**
+ * Construct an ESP I2C master bus given a specific ESP I2C configuration.
+ * An I2C constructor may only be called one time in any application.
+ *
+ * @param config ESP I2C master bus configuration.
+ */
+inline void init_config_i2c(const i2c_master_bus_config_t config)
+{
+    i2c_master_bus_handle_t i2c;
+    ESP_LOGI(TAG, "Initializing new master I2C bus");
+    ESP_ERROR_CHECK(i2c_new_master_bus(&config, &i2c));
+}
+
+/**
+ * Construct and initialize an ESP I2C master bus.
+ * An I2C constructor may only be called one time in any application.
+ *
+ * @param sda GPIO pin for SDA
+ * @param scl GPIO pin for SCL
+ */
+inline void init_i2c(gpio_num_t sda, gpio_num_t scl)
+{
+    return init_config_i2c((i2c_master_bus_config_t){
+            .i2c_port = I2C_BUS_PORT,
+            .sda_io_num = sda,
+            .scl_io_num = scl,
+            .clk_source = I2C_CLK_SRC_DEFAULT,
+            .glitch_ignore_cnt = 7,
+            .flags = {
+                .enable_internal_pullup = true,
+            },
+        }
+    );
+}
+
+/**
+ * ESP I2C master bus handle getter.
+ * This will fail if an I2C instance was never constructed.
+ */
+static i2c_master_bus_handle_t get()
+{
+    i2c_master_bus_handle_t i2c = NULL;
+    ESP_ERROR_CHECK(i2c_master_get_bus_handle(0, &i2c));
+    return i2c;
+}
+
+
+#endif //I2C_H