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Posted to commits@nuttx.apache.org by xi...@apache.org on 2021/06/04 02:34:04 UTC
[incubator-nuttx] 02/02: samv7/samv71-xult: Add board support for
ST7789 LCD controller
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
commit 4494ed8a5d3949ffa20ad02f9780958965487434
Author: Jaroslav Beran <ja...@gmail.com>
AuthorDate: Thu Jun 3 13:33:39 2021 +0200
samv7/samv71-xult: Add board support for ST7789 LCD controller
SPI0 is used for the connection of the LCD controller.
Additional SPI and GPIO signals definitions:
SPI0_NPCS1 - SPI Chip Select, PD25
GPIO_LCD_CD - Command/Data, pin PB2
GPIO_LCD_RST - Reset, pin PB3
boards/arm/samv7/samv71-xult/src/sam_st7789.c is
derived from boards/arm/imxrt/teensy-4.x/src/imxrt_st7789.c
Signed-off-by: Jaroslav Beran <ja...@gmail.com>
---
boards/arm/samv7/samv71-xult/src/Makefile | 4 +
boards/arm/samv7/samv71-xult/src/sam_spi.c | 55 +++++++++++
boards/arm/samv7/samv71-xult/src/sam_st7789.c | 126 +++++++++++++++++++++++++
boards/arm/samv7/samv71-xult/src/samv71-xult.h | 11 +++
4 files changed, 196 insertions(+)
diff --git a/boards/arm/samv7/samv71-xult/src/Makefile b/boards/arm/samv7/samv71-xult/src/Makefile
index 5ffc1e3..3099fb5 100644
--- a/boards/arm/samv7/samv71-xult/src/Makefile
+++ b/boards/arm/samv7/samv71-xult/src/Makefile
@@ -110,4 +110,8 @@ ifeq ($(CONFIG_IEEE802154_MRF24J40),y)
CSRCS += sam_mrf24j40.c
endif
+ifeq ($(CONFIG_LCD_ST7789),y)
+CSRCS += sam_st7789.c
+endif
+
include $(TOPDIR)/boards/Board.mk
diff --git a/boards/arm/samv7/samv71-xult/src/sam_spi.c b/boards/arm/samv7/samv71-xult/src/sam_spi.c
index 6e21a09..150cbe4 100644
--- a/boards/arm/samv7/samv71-xult/src/sam_spi.c
+++ b/boards/arm/samv7/samv71-xult/src/sam_spi.c
@@ -74,6 +74,14 @@ void sam_spidev_initialize(void)
sam_configgpio(CLICK_MB2_CS);
#endif
+
+#ifdef CONFIG_LCD_ST7789
+ /* Enable CS and CMD/DATA for LCD */
+
+ sam_configgpio(SPI0_NPCS1);
+ sam_configgpio(GPIO_LCD_CD);
+#endif
+
#endif /* CONFIG_SAMV7_SPI0_MASTER */
#ifdef CONFIG_SAMV7_SPI0_SLAVE
@@ -168,6 +176,12 @@ void sam_spi0select(uint32_t devid, bool selected)
break;
#endif
+#ifdef CONFIG_LCD_ST7789
+ case SPIDEV_DISPLAY(0):
+ sam_gpiowrite(SPI0_NPCS1, !selected);
+ break;
+#endif
+
default:
break;
}
@@ -210,4 +224,45 @@ uint8_t sam_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
}
#endif
+/****************************************************************************
+ * Name: sam_spi[n]cmddata
+ *
+ * Description:
+ * Some SPI devices require an additional control to determine if the SPI
+ * data being sent is a command or is data. If CONFIG_SPI_CMDDATA then
+ * this function will be called to different be command and data transfers.
+ *
+ * This is often needed, for example, by LCD drivers. Some LCD hardware
+ * may be configured to use 9-bit data transfers with the 9th bit
+ * indicating command or data. That same hardware may be configurable,
+ * instead, to use 8-bit data but to require an additional, board-
+ * specific GPIO control to distinguish command and data. This function
+ * would be needed in that latter case.
+ *
+ * Input Parameters:
+ * dev - SPI device info
+ * devid - Identifies the (logical) device
+ *
+ * Returned Value:
+ * Zero on success; a negated errno on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SPI_CMDDATA
+#ifdef CONFIG_SAMV7_SPI0_MASTER
+int sam_spi0cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
+{
+ if (devid == SPIDEV_DISPLAY(0))
+ {
+ sam_gpiowrite(GPIO_LCD_CD, !cmd);
+ return OK;
+ }
+ else
+ {
+ return -ENODEV;
+ }
+}
+#endif /* CONFIG_SAMV7_SPI0_MASTER */
+#endif /* CONFIG_SPI_CMDDATA */
+
#endif /* CONFIG_SAMV7_SPI */
diff --git a/boards/arm/samv7/samv71-xult/src/sam_st7789.c b/boards/arm/samv7/samv71-xult/src/sam_st7789.c
new file mode 100644
index 0000000..f1430a8
--- /dev/null
+++ b/boards/arm/samv7/samv71-xult/src/sam_st7789.c
@@ -0,0 +1,126 @@
+/****************************************************************************
+ * boards/arm/samv7/samv71-xult/src/sam_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 "sam_gpio.h"
+#include "sam_spi.h"
+#include "samv71-xult.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define LCD_SPI_PORTNO 0
+
+/****************************************************************************
+ * 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)
+{
+ sam_configgpio(GPIO_LCD_RST);
+
+ g_spidev = sam_spibus_initialize(LCD_SPI_PORTNO);
+ if (!g_spidev)
+ {
+ lcderr("ERROR: Failed to initialize SPI port %d\n", LCD_SPI_PORTNO);
+ return -ENODEV;
+ }
+
+ sam_gpiowrite(GPIO_LCD_RST, 0);
+ up_mdelay(1);
+ sam_gpiowrite(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);
+}
diff --git a/boards/arm/samv7/samv71-xult/src/samv71-xult.h b/boards/arm/samv7/samv71-xult/src/samv71-xult.h
index 767dc69..343f006 100644
--- a/boards/arm/samv7/samv71-xult/src/samv71-xult.h
+++ b/boards/arm/samv7/samv71-xult/src/samv71-xult.h
@@ -621,6 +621,17 @@
#define EDBG_CSNO SPI0_CS2
+/* LCD display (over SPI) */
+
+#define GPIO_LCD_CD (GPIO_OUTPUT | GPIO_CFG_DEFAULT | GPIO_OUTPUT_SET | \
+ GPIO_PORT_PIOB | GPIO_PIN2)
+
+#define GPIO_LCD_RST (GPIO_OUTPUT | GPIO_CFG_DEFAULT | GPIO_OUTPUT_SET | \
+ GPIO_PORT_PIOB | GPIO_PIN3)
+
+#define SPI0_NPCS1 (GPIO_OUTPUT | GPIO_CFG_DEFAULT | GPIO_OUTPUT_SET | \
+ GPIO_PORT_PIOD | GPIO_PIN25)
+
/****************************************************************************
* Public Types
****************************************************************************/