esp32s3-devkit: Add support to ST7735 SPI LCD

boards/xtensa/esp32s3/esp32s3-devkit/src/Make.defs

@@ -41,6 +41,10 @@ ifeq ($(CONFIG_ESP32S3_SPI),y)
 CSRCS += esp32s3_board_spi.c
 endif
 
+ifeq ($(CONFIG_LCD_ST7735),y)
+CSRCS += esp32s3_st7735.c
+endif
+
 SCRIPTIN = $(SCRIPTDIR)$(DELIM)esp32s3.template.ld
 SCRIPTOUT = $(SCRIPTDIR)$(DELIM)esp32s3_out.ld
 

boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3-devkit.h

@@ -35,6 +35,11 @@
 
 /* ESP32-S3-DEVKIT GPIOs ****************************************************/
 
+/* LCD pins, i.e. used by ST7735 */
+
+#define GPIO_LCD_DC         14
+#define GPIO_LCD_RST        9
+
 /* BOOT Button */
 
 #define BUTTON_BOOT  0

boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3_board_spi.c

@@ -31,6 +31,7 @@
 #include <nuttx/spi/spi.h>
 
 #include "esp32s3_gpio.h"
+#include "esp32s3-devkit.h"
 
 /****************************************************************************
  * Private Functions
@@ -69,7 +70,7 @@ int esp32s3_spi2_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
        *  data bits are data or a command.
        */
 
-      esp32s3_gpiowrite(CONFIG_ESP32S3_SPI2_MISOPIN, !cmd);
+      esp32s3_gpiowrite(GPIO_LCD_DC, !cmd);
 
       return OK;
     }

boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3_bringup.c

@@ -58,6 +58,10 @@
 #  include <nuttx/input/buttons.h>
 #endif
 
+#ifdef CONFIG_VIDEO_FB
+#include <nuttx/video/fb.h>
+#endif
+
 #include "esp32s3-devkit.h"
 
 /****************************************************************************
@@ -170,6 +174,20 @@ int esp32s3_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_VIDEO_FB
+  ret = fb_register(0, 0);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to initialize Frame Buffer Driver.\n");
+    }
+#elif defined(CONFIG_LCD)
+  ret = board_lcd_initialize();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to initialize LCD.\n");
+    }
+#endif
+
   /* If we got here then perhaps not all initialization was successful, but
    * at least enough succeeded to bring-up NSH with perhaps reduced
    * capabilities.

boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3_st7735.c

@@ -0,0 +1,133 @@
+/****************************************************************************
+ * boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3_st7735.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/spi/spi.h>
+#include <nuttx/lcd/lcd.h>
+#include <nuttx/lcd/st7735.h>
+
+#include "esp32s3_spi.h"
+#include "esp32s3_gpio.h"
+#include "esp32s3-devkit.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define LCD_SPI_PORTNO     2
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static struct spi_dev_s *g_spidev;
+static struct lcd_dev_s *g_lcd = NULL;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  board_lcd_initialize
+ *
+ * Description:
+ *   Initialize the LCD video hardware.  The initial state of the LCD is
+ *   fully initialized, display memory cleared, and the LCD ready to use, but
+ *   with the power setting at 0 (full off).
+ *
+ ****************************************************************************/
+
+int board_lcd_initialize(void)
+{
+  g_spidev = esp32s3_spibus_initialize(LCD_SPI_PORTNO);
+  if (!g_spidev)
+    {
+      lcderr("ERROR: Failed to initialize SPI port %d\n", LCD_SPI_PORTNO);
+      return -ENODEV;
+    }
+
+  /* Data/Control PIN */
+
+  esp32s3_configgpio(GPIO_LCD_DC, OUTPUT);
+  esp32s3_gpiowrite(GPIO_LCD_DC, true);
+
+  /* Reset device */
+
+  esp32s3_configgpio(GPIO_LCD_RST, OUTPUT);
+  esp32s3_gpiowrite(GPIO_LCD_RST, false);
+  usleep(10000);
+  esp32s3_gpiowrite(GPIO_LCD_RST, true);
+  usleep(100000);
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name:  board_lcd_getdev
+ *
+ * Description:
+ *   Return a a reference to the LCD object for the specified LCD.  This
+ *   allows support for multiple LCD devices.
+ *
+ ****************************************************************************/
+
+struct lcd_dev_s *board_lcd_getdev(int devno)
+{
+  g_lcd = st7735_lcdinitialize(g_spidev);
+  if (!g_lcd)
+    {
+      lcderr("ERROR: Failed to bind SPI port %d to LCD %d\n", LCD_SPI_PORTNO,
+      devno);
+    }
+  else
+    {
+      lcdinfo("SPI port %d bound to LCD %d\n", LCD_SPI_PORTNO, devno);
+      return g_lcd;
+    }
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Name:  board_lcd_uninitialize
+ *
+ * Description:
+ *   Uninitialize the LCD support
+ *
+ ****************************************************************************/
+
+void board_lcd_uninitialize(void)
+{
+  /* Turn the display off */
+
+  g_lcd->setpower(g_lcd, 0);
+}