boards/szpi-esp32s3: Add support for ST7789 LCD

Expanded IO0 for SPI C/S, GPIO39 for SPI D/C.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/src/Make.defs

@@ -52,3 +52,7 @@ endif
 ifeq ($(CONFIG_IOEXPANDER_PCA9557),y)
 CSRCS += esp32s3_pca9557.c
 endif
+
+ifeq ($(CONFIG_LCD),y)
+CSRCS += esp32s3_board_lcd.c
+endif

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/src/esp32s3-szpi.h

@@ -27,6 +27,7 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/board.h>
 #include <nuttx/config.h>
 #include <nuttx/compiler.h>
 #include <stdint.h>
@@ -35,8 +36,9 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#define GPIO_LCD_DC    (39)
+#define GPIO_LCD_DC         (39)
-#define GPIO_LCD_RST   (-1)
+#define GPIO_LCD_RST        (-1)
+#define SZPI_LCD_CS_PATH    "/dev/gpio0"
 
 /****************************************************************************
  * Public Types

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/src/esp32s3_board_lcd.c

@@ -0,0 +1,167 @@
+/****************************************************************************
+ * boards/xtensa/esp32s3/lckfb-szpi-esp32s3/src/esp32s3_board_lcd.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 <fcntl.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/signal.h>
+#include <nuttx/spi/spi.h>
+#include <nuttx/lcd/lcd.h>
+#include <nuttx/lcd/st7789.h>
+#include <nuttx/fs/fs.h>
+
+#include <arch/board/board.h>
+
+#include "esp32s3_gpio.h"
+#include "esp32s3_spi.h"
+#include "hardware/esp32s3_gpio_sigmap.h"
+
+#include "esp32s3-szpi.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static struct spi_dev_s *g_spidev;
+static struct lcd_dev_s *g_lcd;
+
+/****************************************************************************
+ * 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).
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_lcd_initialize(void)
+{
+  ssize_t n;
+  int fd;
+
+  /* Pull down C/S */
+
+  fd = nx_open(SZPI_LCD_CS_PATH, O_RDWR);
+  if (fd < 0)
+    {
+      spierr("open C/S pin failed\n");
+      return -ENODEV;
+    }
+
+  n = nx_write(fd, "1", 1);
+  nx_close(fd);
+  if (n != 1)
+    {
+      spierr("write C/S pin failed\n");
+      return -EIO;
+    }
+
+  /* Turn on LCD backlight */
+
+  g_spidev = esp32s3_spibus_initialize(ESP32S3_SPI2);
+  if (!g_spidev)
+    {
+      lcderr("ERROR: Failed to initialize SPI port %d\n", ESP32S3_SPI2);
+      return -ENODEV;
+    }
+
+  g_lcd = st7789_lcdinitialize(g_spidev);
+  if (!g_lcd)
+    {
+      lcderr("ERROR: st7789_lcdinitialize() failed\n");
+      return -ENODEV;
+    }
+
+  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.
+ *
+ * Input Parameters:
+ *   devno - LCD device nmber
+ *
+ * Returned Value:
+ *   LCD device pointer if success or NULL if failed.
+ *
+ ****************************************************************************/
+
+struct lcd_dev_s *board_lcd_getdev(int devno)
+{
+  if (!g_lcd)
+    {
+      lcderr("ERROR: Failed to bind SPI port %d to LCD %d\n",
+             ESP32S3_SPI2, devno);
+    }
+  else
+    {
+      lcdinfo("SPI port %d bound to LCD %d\n", ESP32S3_SPI2, devno);
+      return g_lcd;
+    }
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Name:  board_lcd_uninitialize
+ *
+ * Description:
+ *   Uninitialize the LCD support
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void board_lcd_uninitialize(void)
+{
+  /* Turn the display off */
+
+  g_lcd->setpower(g_lcd, 0);
+}

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/src/esp32s3_board_spi.c

@@ -28,9 +28,11 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include <fcntl.h>
 #include <debug.h>
 
 #include <nuttx/spi/spi.h>
+#include <nuttx/fs/fs.h>
 
 #include "esp32s3_gpio.h"
 #include "esp32s3-szpi.h"
@@ -85,6 +87,29 @@ int esp32s3_spi2_cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
 
 #endif
 
+#if defined(CONFIG_ESP32S3_SPI2) && defined(CONFIG_ESP32S3_SPI_UDCS)
+void esp32s3_spi2_select(struct spi_dev_s *dev, uint32_t devid, bool select)
+{
+  ssize_t n;
+  int fd;
+
+  fd = nx_open(SZPI_LCD_CS_PATH, O_RDWR);
+  if (fd < 0)
+    {
+      spierr("open C/S pin failed\n");
+      return;
+    }
+
+  n = nx_write(fd, select ? "0" : "1", 1);
+  if (n != 1)
+    {
+      spierr("write C/S pin failed\n");
+    }
+
+  nx_close(fd);
+}
+#endif
+
 /****************************************************************************
  * Name: esp32s3_spi3_status
  ****************************************************************************/