moved to configurable components, added SSD1306 support

components/i2c-main/CMakeLists.txt

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+idf_component_register(
+    SRCS 
+        "i2c-main.c"
+    INCLUDE_DIRS "."
+    PRIV_REQUIRES 
+        driver
+)

components/i2c-main/i2c-main.c

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+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdio.h>
+
+#include "driver/i2c.h"
+
+#include "i2c-main.h"
+
+static bool i2c_initialized = false;
+
+void i2c_main_init()
+{
+    i2c_config_t i2c_config = {
+        .mode = I2C_MODE_MASTER,
+        .sda_io_num = I2C_SDA_PIN,
+        .scl_io_num = I2C_SCL_PIN,
+        .sda_pullup_en = GPIO_PULLUP_ENABLE,
+        .scl_pullup_en = GPIO_PULLUP_ENABLE,
+        .master.clk_speed = I2C_CLK_SPEED};
+    ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &i2c_config));
+    ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0));
+}
+
+bool i2c_is_initialized()
+{
+    return i2c_initialized;
+}

components/i2c-main/i2c-main.h

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+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef _i2c_main_H_
+#define _i2c_main_H_
+
+#define I2C_SDA_PIN (21)
+#define I2C_SCL_PIN (22)
+#define I2C_CLK_SPEED (1000000)
+
+/**
+ * @brief initialize main I2C interface
+ */
+void i2c_main_init();
+
+/**
+ * @brief check if I2C interface already initialized
+ * 
+ * @return
+ *      - false I2C not initialized
+ *      - true  I2C initialized
+ */
+bool i2c_is_initialized();
+
+#endif