boards/arm/imxrt/teensy-4.x: Added support for LCD display with ST7789

Signed-off-by: Michal Lenc <lencmich@fel.cvut.cz>

boards/arm/imxrt/teensy-4.x/configs/lcd-4.1/defconfig

@@ -0,0 +1,61 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="teensy-4.x"
+CONFIG_ARCH_BOARD_TEENSY_4X=y
+CONFIG_ARCH_CHIP="imxrt"
+CONFIG_ARCH_CHIP_IMXRT=y
+CONFIG_ARCH_CHIP_MIMXRT1062DVL6A=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARMV7M_DCACHE=y
+CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y
+CONFIG_ARMV7M_ICACHE=y
+CONFIG_ARMV7M_USEBASEPRI=y
+CONFIG_BOARD_LOOPSPERMSEC=104926
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_DRIVERS_VIDEO=y
+CONFIG_EXAMPLES_FB=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_IMXRT_LPSPI4=y
+CONFIG_IMXRT_LPUART1=y
+CONFIG_IMXRT_USBDEV=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LCD=y
+CONFIG_LCD_FRAMEBUFFER=y
+CONFIG_LCD_PORTRAIT=y
+CONFIG_LCD_ST7789=y
+CONFIG_MAX_TASKS=16
+CONFIG_NFILE_DESCRIPTORS=8
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_DISABLE_IFUPDOWN=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_USBCONSOLE=y
+CONFIG_NXFONTS_DISABLE_16BPP=y
+CONFIG_NXFONTS_DISABLE_1BPP=y
+CONFIG_NXFONTS_DISABLE_24BPP=y
+CONFIG_NXFONTS_DISABLE_2BPP=y
+CONFIG_NXFONTS_DISABLE_32BPP=y
+CONFIG_NXFONTS_DISABLE_4BPP=y
+CONFIG_NXFONTS_DISABLE_8BPP=y
+CONFIG_RAM_SIZE=1048576
+CONFIG_RAM_START=0x20200000
+CONFIG_SPI=y
+CONFIG_SPI_CMDDATA=y
+CONFIG_START_DAY=14
+CONFIG_START_MONTH=3
+CONFIG_SYSTEM_NSH=y
+CONFIG_TEENSY_41=y
+CONFIG_USBDEV=y
+CONFIG_USER_ENTRYPOINT="nsh_main"
+CONFIG_VIDEO_FB=y

boards/arm/imxrt/teensy-4.x/src/Makefile

@@ -54,4 +54,8 @@ ifeq ($(CONFIG_IMXRT_ADC),y)
 CSRCS += imxrt_adc.c
 endif
 
+ifeq ($(CONFIG_LCD_ST7789),y)
+CSRCS += imxrt_st7789.c
+endif
+
 include $(TOPDIR)/boards/Board.mk

boards/arm/imxrt/teensy-4.x/src/imxrt_spi.c

@@ -34,7 +34,6 @@
 
 #include "arm_arch.h"
 
-#include "imxrt_config.h"
 #include "imxrt_lpspi.h"
 #include "imxrt_gpio.h"
 #include "teensy-4.h"
@@ -62,6 +61,7 @@ void weak_function imxrt_spidev_initialize(void)
 #endif
 #ifdef CONFIG_IMXRT_LPSPI4
   imxrt_config_gpio(GPIO_LPSPI4_CS); /* LPSPI4 chip select */
+  imxrt_config_gpio(GPIO_LCD_CD);
 #endif
 }
 
@@ -146,8 +146,10 @@ void imxrt_lpspi4select(FAR struct spi_dev_s *dev, uint32_t devid,
 {
   spiinfo("devid: %d CS: %s\n", (int)devid,
           selected ? "assert" : "de-assert");
-
+  if (devid == SPIDEV_DISPLAY(0))
+    {
       imxrt_gpio_write(GPIO_LPSPI4_CS, !selected);
+    }
 }
 
 uint8_t imxrt_lpspi4status(FAR struct spi_dev_s *dev, uint32_t devid)
@@ -204,7 +206,15 @@ int imxrt_lpspi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
 #ifdef CONFIG_IMXRT_LPSPI4
 int imxrt_lpspi4cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
 {
+  if (devid == SPIDEV_DISPLAY(0))
+    {
+      imxrt_gpio_write(GPIO_LCD_CD, !cmd);
+      return OK;
+    }
+  else
+    {
       return -ENODEV;
+    }
 }
 #endif
 #endif /* CONFIG_SPI_CMDDATA */

boards/arm/imxrt/teensy-4.x/src/imxrt_st7789.c

@@ -0,0 +1,125 @@
+/****************************************************************************
+ * boards/arm/imxrt/teensy-4.x/src/imxrt_st7789.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/st7789.h>
+
+#include "imxrt_lpspi.h"
+#include "teensy-4.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define LCD_SPI_PORTNO 4
+
+/****************************************************************************
+ * 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)
+{
+  imxrt_config_gpio(GPIO_LCD_RST);
+
+  g_spidev = imxrt_lpspibus_initialize(LCD_SPI_PORTNO);
+  if (!g_spidev)
+    {
+      lcderr("ERROR: Failed to initialize SPI port %d\n", LCD_SPI_PORTNO);
+      return -ENODEV;
+    }
+
+  imxrt_gpio_write(GPIO_LCD_RST, 0);
+  up_mdelay(1);
+  imxrt_gpio_write(GPIO_LCD_RST, 1);
+  up_mdelay(120);
+
+  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.
+ *
+ ****************************************************************************/
+
+FAR struct lcd_dev_s *board_lcd_getdev(int devno)
+{
+  g_lcd = st7789_lcdinitialize(g_spidev);
+  if (!g_lcd)
+    {
+      lcderr("ERROR: Failed to bind SPI port 4 to LCD %d\n", devno);
+    }
+  else
+    {
+      lcdinfo("SPI port 4 bound to LCD %d\n", 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);
+}

boards/arm/imxrt/teensy-4.x/src/teensy-4.h

@@ -79,6 +79,14 @@
 #  define GPIO_LPSPI4_CS       (GPIO_OUTPUT | GPIO_OUTPUT_ONE | \
                               GPIO_PORT2 | GPIO_PIN0 | IOMUX_LPSPI4_CS)
 
+/* LCD dispay */
+
+#  define GPIO_LCD_RST        (GPIO_OUTPUT | GPIO_OUTPUT_ONE | \
+                              GPIO_PORT2 | GPIO_PIN18 | IOMUX_LPSPI4_CS)    /* B1_02 */
+
+#  define GPIO_LCD_CD         (GPIO_OUTPUT | GPIO_OUTPUT_ONE | \
+                              GPIO_PORT2 | GPIO_PIN19 | IOMUX_LPSPI4_CS)    /* B1_03 */
+
 /* USB OTG ID Pin： GPIO_AD_B1_02 */
 
 #define GPIO_USBOTG_ID  (GPIO_USB_OTG1_ID_1 | IOMUX_USBOTG_ID_DEFAULT)      /* AD_B1_02 */