boards/stm32l496g-disco: enable ST7789 display and touch panel

boards/stm32l496g-disco/Kconfig

@@ -43,6 +43,8 @@ config BOARD_STM32L496G_DISCO
 
     select HAVE_SAUL_GPIO
     select HAVE_FT5X06
+    select HAVE_ST7789
+    select HAVE_LCD_PARALLEL_16BIT if MODULE_ST7789
 
     select MODULE_PERIPH_LPUART if MODULE_PERIPH_UART
     select MODULE_PERIPH_UART_HW_FC if MODULE_PERIPH_UART && !MODULE_PERIPH_SPI_STMOD && HAS_PERIPH_UART_HW_FC

boards/stm32l496g-disco/Makefile.dep

@@ -21,3 +21,11 @@ ifneq (,$(filter periph_uart,$(USEMODULE)))
     FEATURES_REQUIRED += periph_uart_hw_fc
   endif
 endif
+
+ifneq (,$(filter disp_dev,$(USEMODULE)))
+  USEMODULE += st7789
+endif
+
+ifneq (,$(filter st7789,$(USEMODULE)))
+  USEMODULE += lcd_parallel_16bit
+endif

boards/stm32l496g-disco/board.c

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2023 Gunar Schorcht
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_stm32l496g-disco
+ * @{
+ *
+ * @file
+ * @brief       Board specific initializations for the STM32L496G-DISCO board
+ *
+ * @author      Gunar Schorcht <[email protected]>
+ */
+
+#include "board.h"
+
+void board_init(void)
+{
+#if MODULE_ST77XX
+    /* initialize the pin for the HIGH active LCD_BL signal */
+    gpio_init(BACKLIGHT_PIN, GPIO_OUT);
+#endif
+#if MODULE_ST77XX || MODULE_FT5X06
+    /* enable VDD_LCD by the LOW active LCD_PWR_ON signal connected to PH0 */
+    gpio_init(LCD_DISP_PIN, GPIO_OUT);
+    gpio_clear(LCD_DISP_PIN);
+#endif
+}

boards/stm32l496g-disco/include/board.h

@@ -33,7 +33,7 @@ extern "C" {
  * @name    LCD Backlight control defines
  * @{
  */
-#define BACKLIGHT_PIN       GPIO_PIN(PORT_I, 0)     /**< Backlight pin */
+#define BACKLIGHT_PIN       GPIO_PIN(PORT_I, 0)     /**< Backlight pin (HIGH active LD_BL) */
 #define BACKLIGHT_MASK      (1 << 0)                /**< Backlight pin mask */
 
 /** Set the backlight pin */
@@ -46,11 +46,97 @@ extern "C" {
 
 /**
  * @name    LCD display definitions
+ *
+ * The STM32L496-DISCO board has a 240 x 240 pixel TFT color LCD display with
+ * ST7789 driver IC using MCU 8080 16-bit parallel interface (default with
+ * SB14=ON and SB15=OFF). SB14 and SB15 control the ST7789 `IM0` signal.
+ * With SB14=OFF and SB15=ON, the MCU 8080 8-bit parallel interface is enabled.
+ *
+ * For the `LCD_*` pins the identifiers are used as given in the [schematic]
+ * (https://www.st.com/resource/en/schematic_pack/mb1261-l496g-b06-schematic.pdf).
+ *
+ * The LCD display has to switched on explicitly by activating VDD_LCD using
+ * the LOW active `LD_PWR_ON` signal.
+ *
+ * @note The `LCD_RESET` signal is provided by the MFX GPIO2 pin. Since the MFX
+ * is not yet supported, the `LCD_RESET` signal cannot be used by the display
+ * driver. However, since the `LCD_RESET` signal is pulled up and the MFX GPIO2
+ * pin is configured as a floating input by default, the driver will work
+ * without MFX support and the `LCD_RESET` signal.
+ *
+ * @{
+ */
+#define LCD_DISP_PIN        GPIO_PIN(PORT_H, 0)     /**< LCD power pin (LOW active LD_PWR_ON) */
+#define LCD_SCREEN_WIDTH    240                     /**< LCD width */
+#define LCD_SCREEN_HEIGHT   240                     /**< LCD height */
+
+#define LCD_D0              GPIO_PIN(PORT_D, 14)    /**< LCD_D0 pin */
+#define LCD_D1              GPIO_PIN(PORT_D, 15)    /**< LCD_D1 pin */
+#define LCD_D2              GPIO_PIN(PORT_D, 0)     /**< LCD_D2 pin */
+#define LCD_D3              GPIO_PIN(PORT_D, 1)     /**< LCD_D3 pin */
+#define LCD_D4              GPIO_PIN(PORT_E, 7)     /**< LCD_D4 pin */
+#define LCD_D5              GPIO_PIN(PORT_E, 8)     /**< LCD_D5 pin */
+#define LCD_D6              GPIO_PIN(PORT_E, 9)     /**< LCD_D6 pin */
+#define LCD_D7              GPIO_PIN(PORT_E, 10)    /**< LCD_D7 pin */
+#define LCD_D8              GPIO_PIN(PORT_E, 11)    /**< LCD_D8 pin */
+#define LCD_D9              GPIO_PIN(PORT_E, 12)    /**< LCD_D9 pin */
+#define LCD_D10             GPIO_PIN(PORT_E, 13)    /**< LCD_D10 pin */
+#define LCD_D11             GPIO_PIN(PORT_E, 14)    /**< LCD_D11 pin */
+#define LCD_D12             GPIO_PIN(PORT_E, 15)    /**< LCD_D12 pin */
+#define LCD_D13             GPIO_PIN(PORT_D, 8)     /**< LCD_D13 pin */
+#define LCD_D14             GPIO_PIN(PORT_D, 9)     /**< LCD_D14 pin */
+#define LCD_D15             GPIO_PIN(PORT_D, 10)    /**< LCD_D15 pin */
+#define LCD_TE              GPIO_PIN(PORT_H, 7)     /**< LCD_TE pin */
+#define LCD_WE              GPIO_PIN(PORT_D, 5)     /**< LCD_WE pin */
+#define LCD_OE              GPIO_PIN(PORT_D, 4)     /**< LCD_OE pin */
+#define LCD_RS              GPIO_PIN(PORT_D, 13)    /**< LCD_RS pin */
+#define LCD_NE              GPIO_PIN(PORT_D, 7)     /**< LCD_NE pin */
+#define LCD_RST             GPIO_UNDEF              /**< LCD_RST pin (MFX_GPIO2) */
+#define LCD_BACKLIGHT       BACKLIGHT_PIN           /**< LCD_BL pin */
+
+#define ST77XX_PARAM_CNTRL         ST77XX_CNTRL_ST7789  /**< ST77xx controller variant */
+#define ST77XX_PARAM_SPI           SPI_UNDEF        /**< parallel interface is used */
+#define ST77XX_PARAM_D0            LCD_D0           /**< ST77xx D0 signal */
+#define ST77XX_PARAM_D1            LCD_D1           /**< ST77xx D1 signal */
+#define ST77XX_PARAM_D2            LCD_D2           /**< ST77xx D2 signal */
+#define ST77XX_PARAM_D3            LCD_D3           /**< ST77xx D3 signal */
+#define ST77XX_PARAM_D4            LCD_D4           /**< ST77xx D4 signal */
+#define ST77XX_PARAM_D5            LCD_D5           /**< ST77xx D5 signal */
+#define ST77XX_PARAM_D6            LCD_D6           /**< ST77xx D6 signal */
+#define ST77XX_PARAM_D7            LCD_D7           /**< ST77xx D7 signal */
+#define ST77XX_PARAM_D8            LCD_D8           /**< ST77xx D8 signal */
+#define ST77XX_PARAM_D9            LCD_D9           /**< ST77xx D9 signal */
+#define ST77XX_PARAM_D10           LCD_D10          /**< ST77xx D10 signal */
+#define ST77XX_PARAM_D11           LCD_D11          /**< ST77xx D11 signal */
+#define ST77XX_PARAM_D12           LCD_D12          /**< ST77xx D12 signal */
+#define ST77XX_PARAM_D13           LCD_D13          /**< ST77xx D13 signal */
+#define ST77XX_PARAM_D14           LCD_D14          /**< ST77xx D14 signal */
+#define ST77XX_PARAM_D15           LCD_D15          /**< ST77xx D15 signal */
+#define ST77XX_PARAM_WRX           LCD_WE           /**< ST77xx WR signal */
+#define ST77XX_PARAM_RDX           LCD_OE           /**< ST77xx RD signal */
+#define ST77XX_PARAM_DCX           LCD_RS           /**< ST77xx RS signal */
+#define ST77XX_PARAM_RST           LCD_RST          /**< ST77xx RST signal */
+#define ST77XX_PARAM_CS            LCD_NE           /**< ST77xx CS signal */
+#define ST77XX_PARAM_RGB           1                /**< ST77xx RGB mode */
+#define ST77XX_PARAM_INVERTED      1                /**< ST77xx inverted colors */
+#define ST77XX_PARAM_ROTATION      ST77XX_ROTATION_0   /**< ST77xx rotation */
+#define ST77XX_PARAM_NUM_LINES     LCD_SCREEN_HEIGHT   /**< ST77xx number of lines */
+#define ST77XX_PARAM_RGB_CHANNELS  LCD_SCREEN_WIDTH    /**< ST77xx number of channels */
+/** @} */
+
+/**
+ * @name Touch panel configuration
+ *
+ * The board uses a FT6236 touch panel driver IC.
+ *
  * @{
  */
-#define LCD_DISP_PIN        GPIO_PIN(PORT_H, 0)     /**< LCD screen enable pin */
-#define LCD_SCREEN_WIDTH    240                     /**< LCD screen width */
-#define LCD_SCREEN_HEIGHT   240                     /**< LCD screen height */
+#define FT5X06_PARAM_I2C_DEV    I2C_DEV(1)           /**< I2C device */
+#define FT5X06_PARAM_INT_PIN    GPIO_PIN(PORT_G, 14) /**< Interrupt pin */
+#define FT5X06_PARAM_XMAX       LCD_SCREEN_WIDTH     /**< Max width */
+#define FT5X06_PARAM_YMAX       LCD_SCREEN_HEIGHT    /**< Max height */
+#define FT5X06_PARAM_TYPE       FT5X06_TYPE_FT6X36   /**< Device type */
+#define FT5X06_PARAM_XYCONV     FT5X06_SWAP_XY | FT5X06_MIRROR_Y /**< Swap XY, then mirror Y */
 /** @} */
 
 /**

tests/drivers/st77xx/Makefile

@@ -5,6 +5,7 @@ include ../Makefile.drivers_common
 ST7789_BOARDS = \
   esp32s2-lilygo-ttgo-t8 \
   esp32s3-usb-otg \
+  stm32l496g-disco \
   #
 
 ST7796_BOARDS = \