Add I2C example to communication abstraction interface

lv_port/lv_port_display_espressif.c

@@ -7,6 +7,11 @@
 #include "driver/gpio.h"
 
 #include "disp_spi.h"
+#include "lvgl_i2c/i2c_manager.h"
+
+/* TODO: This is ssd1306 specific */
+#define OLED_I2C_PORT                       (CONFIG_LV_I2C_DISPLAY_PORT)
+#define OLED_I2C_ADDRESS                    0x3C
 
 #define LV_DISPLAY_DC_CMD_MODE    0
 #define LV_DISPLAY_DC_DATA_MODE   1
@@ -75,6 +80,9 @@ void display_interface_send_cmd(lv_disp_drv_t *drv, uint8_t cmd, void *args, siz
         disp_spi_send_data(args, args_len);
     }
 #elif defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_I2C)
+    (void) drv;
+    uint8_t *data = (uint8_t *) args;
+    lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, cmd, data, args_len); 
 #endif
 }
 
@@ -86,5 +94,20 @@ void display_interface_send_data_async(lv_disp_drv_t *drv, void *data, size_t le
     
     disp_spi_send_colors(data, len);
 #elif defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_I2C)
+    (void) drv;
+    lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, OLED_CONTROL_BYTE_DATA_STREAM, data, len);
+#endif
+}
+
+void display_interface_send_data(lv_disp_drv_t *drv, void *data, size_t len)
+{
+#if defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_SPI)
+    disp_wait_for_pending_transactions();
+    display_port_gpio_dc(drv, LV_DISPLAY_DC_DATA_MODE);
+    
+    disp_spi_send_colors(data, len);
+#elif defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_I2C)
+    (void) drv;
+    lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, OLED_CONTROL_BYTE_DATA_STREAM, data, len);
 #endif
 }

lvgl_tft/disp_driver.c

@@ -28,7 +28,7 @@ void *disp_driver_init(lv_disp_drv_t *drv)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SH1107
     sh1107_init();
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1306
-    ssd1306_init();
+    ssd1306_init(drv);
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_FT81X
     FT81x_init();
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_IL3820

lvgl_tft/display_port.h

@@ -57,6 +57,7 @@ void display_port_gpio_rst(lv_disp_drv_t *drv, uint8_t state);
 bool display_port_gpio_is_busy(lv_disp_drv_t *drv);
 
 void display_interface_send_cmd(lv_disp_drv_t *drv, uint8_t cmd, void *args, size_t args_len);
+void display_interface_send_data(lv_disp_drv_t *drv, void *data, size_t len);
 void display_interface_send_data_async(lv_disp_drv_t *drv, void *data, size_t len);
 
 #ifdef __cplusplus

lvgl_tft/ssd1306.c

@@ -15,16 +15,13 @@
  *********************/
 #include "assert.h"
 
-#include "lvgl_i2c/i2c_manager.h"
-
 #include "ssd1306.h"
+#include "display_port.h"
 
 /*********************
  *      DEFINES
  *********************/
-#define OLED_I2C_PORT                       (CONFIG_LV_I2C_DISPLAY_PORT)
 // SLA (0x3C) + WRITE_MODE (0x00) =  0x78 (0b01111000)
-#define OLED_I2C_ADDRESS                    0x3C
 #define OLED_WIDTH                          128
 #define OLED_HEIGHT                         64
 #define OLED_COLUMNS                        128
@@ -75,8 +72,6 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static uint8_t send_data(lv_disp_drv_t *disp_drv, void *bytes, size_t bytes_len);
-static uint8_t send_pixels(lv_disp_drv_t *disp_drv, void *color_buffer, size_t buffer_len);
 
 /**********************
  *  STATIC VARIABLES
@@ -92,7 +87,7 @@ static uint8_t send_pixels(lv_disp_drv_t *disp_drv, void *color_buffer, size_t b
 /**********************
  *   GLOBAL FUNCTIONS
  **********************/
-void ssd1306_init(void)
+void ssd1306_init(lv_disp_drv_t *disp_drv)
 {
     uint8_t orientation_1 = 0;
     uint8_t orientation_2 = 0;
@@ -127,8 +122,7 @@ void ssd1306_init(void)
         OLED_CMD_DISPLAY_ON
     };
 
-    uint8_t err = send_data(NULL, conf, sizeof(conf));
+    display_interface_send_cmd(disp_drv, OLED_CONTROL_BYTE_CMD_STREAM, &conf[1], sizeof(conf) - 1);
-    assert(0 == err);
 }
 
 void ssd1306_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
@@ -162,10 +156,8 @@ void ssd1306_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t
         row2,
     };
 
-    uint8_t err = send_data(disp_drv, conf, sizeof(conf));
+    display_interface_send_cmd(disp_drv, OLED_CONTROL_BYTE_CMD_STREAM, &conf[1], sizeof(conf) - 1);
-    assert(0 == err);
+    display_interface_send_data(disp_drv, color_p, OLED_COLUMNS * (1 + row2 - row1));
-    err = send_pixels(disp_drv, color_p, OLED_COLUMNS * (1 + row2 - row1));
-    assert(0 == err);
 
     lv_disp_flush_ready(disp_drv);
 }
@@ -188,8 +180,7 @@ void ssd1306_sleep_in(void)
         OLED_CMD_DISPLAY_OFF
     };
 
-    uint8_t err = send_data(NULL, conf, sizeof(conf));
+    display_interface_send_cmd(NULL, OLED_CONTROL_BYTE_CMD_STREAM, &conf[1], 1);
-    assert(0 == err);
 }
 
 void ssd1306_sleep_out(void)
@@ -199,25 +190,5 @@ void ssd1306_sleep_out(void)
         OLED_CMD_DISPLAY_ON
     };
 
-    uint8_t err = send_data(NULL, conf, sizeof(conf));
+    display_interface_send_cmd(NULL, OLED_CONTROL_BYTE_CMD_STREAM, &conf[1], 1);
-    assert(0 == err);
-}
-
-/**********************
- *   STATIC FUNCTIONS
- **********************/
-static uint8_t send_data(lv_disp_drv_t *disp_drv, void *bytes, size_t bytes_len)
-{
-    (void) disp_drv;
-
-    uint8_t *data = (uint8_t *) bytes;
-
-    return lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, data[0], data + 1, bytes_len - 1 );
-}
-
-static uint8_t send_pixels(lv_disp_drv_t *disp_drv, void *color_buffer, size_t buffer_len)
-{
-    (void) disp_drv;
-
-    return lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, OLED_CONTROL_BYTE_DATA_STREAM, color_buffer, buffer_len);
 }

lvgl_tft/ssd1306.h

@@ -34,7 +34,7 @@ extern "C" {
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
-void ssd1306_init(void);
+void ssd1306_init(lv_disp_drv_t *disp_drv);
 void ssd1306_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_map);
 void ssd1306_rounder(lv_disp_drv_t * disp_drv, lv_area_t *area);
 void ssd1306_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,