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samv7/samv71-xult: Add board support for ST7789 LCD controller

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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 <jara.beran@gmail.com>
This commit is contained in:
Jaroslav Beran 2021-06-03 13:33:39 +02:00 committed by Xiang Xiao
parent d13be4ea57
commit 4494ed8a5d
4 changed files with 196 additions and 0 deletions
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4
boards/arm/samv7/samv71-xult/src/Makefile
View File

@ -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

55
boards/arm/samv7/samv71-xult/src/sam_spi.c
View File

@ -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 */

126
boards/arm/samv7/samv71-xult/src/sam_st7789.c Normal file
View File

@ -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);
}

11
boards/arm/samv7/samv71-xult/src/samv71-xult.h
View File

@ -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
****************************************************************************/