fix(i2c_lcd): using function overloading to keep esp_lcd_new_panel_io_i2c

becuase _Generic is not available in C++

Closes espressif#14037

Author: suda-morris

components/esp_lcd/include/esp_lcd_io_i2c.h

@@ -67,6 +67,43 @@ esp_err_t esp_lcd_new_panel_io_i2c_v1(uint32_t bus, const esp_lcd_panel_io_i2c_c
  */
 esp_err_t esp_lcd_new_panel_io_i2c_v2(i2c_master_bus_handle_t bus, const esp_lcd_panel_io_i2c_config_t *io_config, esp_lcd_panel_io_handle_t *ret_io);
 
+#ifdef __cplusplus
+}
+#endif
+
+#ifdef __cplusplus
+/**
+ * @brief Create LCD panel IO handle
+ *
+ * @param[in] bus I2C bus ID, indicates which I2C port to use
+ * @param[in] io_config IO configuration, for I2C interface
+ * @param[out] ret_io Returned IO handle
+ * @return
+ *          - ESP_ERR_INVALID_ARG   if parameter is invalid
+ *          - ESP_ERR_NO_MEM        if out of memory
+ *          - ESP_OK                on success
+ */
+static inline void esp_lcd_new_panel_io_i2c(uint32_t bus, const esp_lcd_panel_io_i2c_config_t *io_config, esp_lcd_panel_io_handle_t *ret_io)
+{
+    esp_lcd_new_panel_io_i2c_v1(bus, io_config, ret_io);
+}
+
+/**
+ * @brief Create LCD panel IO handle
+ *
+ * @param[in] bus I2C bus handle, returned from `i2c_new_master_bus`
+ * @param[in] io_config IO configuration, for I2C interface
+ * @param[out] ret_io Returned IO handle
+ * @return
+ *          - ESP_ERR_INVALID_ARG   if parameter is invalid
+ *          - ESP_ERR_NO_MEM        if out of memory
+ *          - ESP_OK                on success
+ */
+static inline void esp_lcd_new_panel_io_i2c(i2c_master_bus_handle_t bus, const esp_lcd_panel_io_i2c_config_t *io_config, esp_lcd_panel_io_handle_t *ret_io)
+{
+    esp_lcd_new_panel_io_i2c_v2(bus, io_config, ret_io);
+}
+#else
 /**
  * @brief Create LCD panel IO handle
  *
@@ -80,8 +117,6 @@ esp_err_t esp_lcd_new_panel_io_i2c_v2(i2c_master_bus_handle_t bus, const esp_lcd
  */
 #define esp_lcd_new_panel_io_i2c(bus, io_config, ret_io) _Generic((bus),  \
             i2c_master_bus_handle_t : esp_lcd_new_panel_io_i2c_v2, \
-            default : esp_lcd_new_panel_io_i2c_v1) (bus, io_config, ret_io) \
+            default : esp_lcd_new_panel_io_i2c_v1) (bus, io_config, ret_io)
 
-#ifdef __cplusplus
-}
 #endif

tools/test_apps/system/cxx_build_test/main/test_i2c_lcd.cpp

@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
 #include "esp_lcd_panel_vendor.h"
+#include "esp_lcd_panel_io.h"
+#include "driver/i2c_master.h"
 
 const esp_lcd_panel_dev_config_t panel_config0 = {
     .reset_gpio_num = 0,
@@ -37,3 +39,40 @@ const esp_lcd_panel_dev_config_t panel_config2 = {
     },
     .vendor_config = NULL,
 };
+
+void test_i2c_lcd_apis(void)
+{
+    i2c_master_bus_config_t i2c_bus_conf = {
+        .i2c_port = -1,
+        .sda_io_num = GPIO_NUM_0,
+        .scl_io_num = GPIO_NUM_2,
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .glitch_ignore_cnt = 0,
+        .intr_priority = 1,
+        .trans_queue_depth = 4,
+        .flags = {
+            .enable_internal_pullup = true,
+        }
+    };
+
+    i2c_master_bus_handle_t bus_handle;
+    i2c_new_master_bus(&i2c_bus_conf, &bus_handle);
+
+    esp_lcd_panel_io_handle_t io_handle = NULL;
+    esp_lcd_panel_io_i2c_config_t io_config = {
+        .dev_addr = 0x3c,
+        .on_color_trans_done = NULL,
+        .user_ctx = NULL,
+        .control_phase_bytes = 1,
+        .dc_bit_offset = 6,
+        .lcd_cmd_bits = 8,
+        .lcd_param_bits = 8,
+        .flags = {
+            .dc_low_on_data = false,
+            .disable_control_phase = false,
+        },
+        .scl_speed_hz = 10 * 1000,
+    };
+
+    esp_lcd_new_panel_io_i2c(bus_handle, &io_config, &io_handle);
+}