diff --git a/include/esp_lcd_panel_gc9a01.h b/include/esp_lcd_panel_gc9a01.h
index 2a95be2..2927395 100644
--- a/include/esp_lcd_panel_gc9a01.h
+++ b/include/esp_lcd_panel_gc9a01.h
@@ -9,7 +9,13 @@ extern "C"
 {
 #endif
 
-esp_err_t esp_lcd_new_panel_gc9a01(const esp_lcd_panel_io_handle_t io, const esp_lcd_panel_dev_config_t *config, esp_lcd_panel_handle_t *handle);
+    typedef struct
+    {
+        const lcd_init_cmd_t *init_cmds;
+        uint16_t init_cmds_size;
+    } gc9a01_vendor_config_t;
+
+    esp_err_t esp_lcd_new_panel_gc9a01(const esp_lcd_panel_io_handle_t io, const esp_lcd_panel_dev_config_t *config, esp_lcd_panel_handle_t *handle);
 
 #ifdef __cplusplus
 }
diff --git a/include/esp_lcd_panel_st7796.h b/include/esp_lcd_panel_st7796.h
index 7686b1f..35332b4 100644
--- a/include/esp_lcd_panel_st7796.h
+++ b/include/esp_lcd_panel_st7796.h
@@ -9,7 +9,13 @@ extern "C"
 {
 #endif
 
-esp_err_t esp_lcd_new_panel_st7796(const esp_lcd_panel_io_handle_t io, const esp_lcd_panel_dev_config_t *config, esp_lcd_panel_handle_t *handle);
+    typedef struct
+    {
+        const lcd_init_cmd_t *init_cmds;
+        uint16_t init_cmds_size;
+    } st7796_vendor_config_t;
+
+    esp_err_t esp_lcd_new_panel_st7796(const esp_lcd_panel_io_handle_t io, const esp_lcd_panel_dev_config_t *config, esp_lcd_panel_handle_t *handle);
 
 #ifdef __cplusplus
 }
diff --git a/src/esp_lcd_panel_gc9a01.c b/src/esp_lcd_panel_gc9a01.c
index 00e598f..660ff1e 100644
--- a/src/esp_lcd_panel_gc9a01.c
+++ b/src/esp_lcd_panel_gc9a01.c
@@ -67,8 +67,7 @@ const lcd_init_cmd_t gc9a01_vendor_specific_init_default[] = {
     {0x67, (const uint8_t[]){0x00, 0x3C, 0x00, 0x00, 0x00, 0x01, 0x54, 0x10, 0x32, 0x98}, 10, 0},
     {0x74, (const uint8_t[]){0x10, 0x45, 0x80, 0x00, 0x00, 0x4E, 0x00}, 7, 0},
     {0x98, (const uint8_t[]){0x3e, 0x07}, 2, 0},
-    {0x99, (const uint8_t[]){0x3e, 0x07}, 2, 0}
-};
+    {0x99, (const uint8_t[]){0x3e, 0x07}, 2, 0}};
 
 esp_err_t gc9a01_reset(esp_lcd_panel_t *panel)
 {
@@ -141,10 +140,10 @@ esp_err_t gc9a01_init(esp_lcd_panel_t *panel)
 
     const lcd_init_cmd_t *cmd = gc9a01_vendor_specific_init_default;
     uint16_t cmds_size = sizeof(gc9a01_vendor_specific_init_default) / sizeof(lcd_init_cmd_t);
-    if (ph->cmd)
+    if (ph->config.vendor_config != NULL)
     {
-        cmd = ph->cmd;
-        cmds_size = ph->cmds_size;
+        cmd = ((gc9a01_vendor_config_t *)ph->config.vendor_config)->init_cmds;
+        cmds_size = ((gc9a01_vendor_config_t *)ph->config.vendor_config)->init_cmds_size;
     }
 
     while (cmds_size-- > 0)
diff --git a/src/esp_lcd_panel_st7796.c b/src/esp_lcd_panel_st7796.c
index 7bb80e5..502a2bb 100644
--- a/src/esp_lcd_panel_st7796.c
+++ b/src/esp_lcd_panel_st7796.c
@@ -19,8 +19,6 @@ typedef struct
     int x_gap;
     int y_gap;
     uint8_t madctl;
-    const lcd_init_cmd_t *cmd;
-    const uint16_t cmds_size;
 } st7796_panel_t;
 
 const lcd_init_cmd_t st7796_vendor_specific_init_default[] = {
@@ -64,7 +62,7 @@ esp_err_t st7796_reset(esp_lcd_panel_t *panel)
         }
     }
 
-    vTaskDelay(pdMS_TO_TICKS(120));
+    vTaskDelay(pdMS_TO_TICKS(5));
 
     return ESP_OK;
 }
@@ -112,10 +110,10 @@ esp_err_t st7796_init(esp_lcd_panel_t *panel)
 
     const lcd_init_cmd_t *cmd = st7796_vendor_specific_init_default;
     uint16_t cmds_size = sizeof(st7796_vendor_specific_init_default) / sizeof(lcd_init_cmd_t);
-    if (ph->cmd)
+    if (ph->config.vendor_config != NULL)
     {
-        cmd = ph->cmd;
-        cmds_size = ph->cmds_size;
+        cmd = ((st7796_vendor_config_t *)ph->config.vendor_config)->init_cmds;
+        cmds_size = ((st7796_vendor_config_t *)ph->config.vendor_config)->init_cmds_size;
     }
 
     while (cmds_size-- > 0)
@@ -160,8 +158,8 @@ esp_err_t st7796_draw_bitmap(esp_lcd_panel_t *panel, int x_start, int y_start, i
     y_end += ph->y_gap;
 
     esp_err_t res;
-    const uint8_t caset[4] = {x_start >> 8, x_start & 0xff, (x_end - 1) >> 8, (x_end - 1) & 0xff};
-    const uint8_t raset[4] = {y_start >> 8, y_start & 0xff, (y_end - 1) >> 8, (y_end - 1) & 0xff};
+    const uint8_t caset[4] = {x_start >> 8, x_start, (x_end - 1) >> 8, (x_end - 1)};
+    const uint8_t raset[4] = {y_start >> 8, y_start, (y_end - 1) >> 8, (y_end - 1)};
     if ((res = esp_lcd_panel_io_tx_param(ph->io, LCD_CMD_CASET, caset, sizeof(caset))) != ESP_OK ||
         (res = esp_lcd_panel_io_tx_param(ph->io, LCD_CMD_RASET, raset, sizeof(raset))) != ESP_OK)
     {