configs/stm32f103-minimum: Add board support for MAX7219 LED Matrix controller

configs/stm32f103-minimum/src/Makefile

@@ -101,6 +101,10 @@ ifeq ($(CONFIG_SENSORS_HCSR04),y)
   CSRCS += stm32_hcsr04.c
 endif
 
+ifeq ($(CONFIG_LCD_MAX7219),y)
+  CSRCS += stm32_max7219.c
+endif
+
 ifeq ($(CONFIG_LCD_ST7567),y)
   CSRCS += stm32_lcd.c
 endif

configs/stm32f103-minimum/src/stm32_max7219.c

@@ -0,0 +1,127 @@
+/****************************************************************************
+ * config/stm32f103-minimum/src/stm32_max7219.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * 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/max7219.h>
+
+#include "stm32_gpio.h"
+#include "stm32_spi.h"
+#include "stm32f103_minimum.h"
+
+#ifdef CONFIG_NX_LCDDRIVER
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define LCD_SPI_PORTNO 1   /* On SPI1 */
+
+#ifndef CONFIG_LCD_CONTRAST
+#  define CONFIG_LCD_CONTRAST 60
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+FAR struct spi_dev_s *g_spidev;
+FAR struct lcd_dev_s *g_lcddev;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_lcd_initialize
+ ****************************************************************************/
+
+int board_lcd_initialize(void)
+{
+  g_spidev = stm32_spibus_initialize(LCD_SPI_PORTNO);
+
+  if (!g_spidev)
+    {
+      lcderr("ERROR: Failed to initialize SPI port %d\n", LCD_SPI_PORTNO);
+      return 0;
+    }
+
+  return 1;
+}
+
+/****************************************************************************
+ * Name: board_lcd_getdev
+ ****************************************************************************/
+
+FAR struct lcd_dev_s *board_lcd_getdev(int lcddev)
+{
+  g_lcddev = max7219_initialize(g_spidev, lcddev);
+  if (!g_lcddev)
+    {
+      lcderr("ERROR: Failed to bind SPI port 1 to LCD %d: %d\n", lcddev);
+    }
+  else
+    {
+      lcdinfo("SPI port 1 bound to LCD %d\n", lcddev);
+
+      return g_lcddev;
+    }
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Name: board_lcd_uninitialize
+ ****************************************************************************/
+
+void board_lcd_uninitialize(void)
+{
+  /* TO-FIX */
+}
+
+#endif /* CONFIG_NX_LCDDRIVER */

configs/stm32f103-minimum/src/stm32_spi.c

@@ -86,6 +86,10 @@ void stm32_spidev_initialize(void)
   (void)stm32_configgpio(GPIO_CS_MFRC522);    /* MFRC522 chip select */
 #endif
 
+#ifdef CONFIG_LCD_MAX7219
+  (void)stm32_configgpio(STM32_LCD_CS);       /* MAX7219 chip select */
+#endif
+
 #ifdef CONFIG_LCD_ST7567
   (void)stm32_configgpio(STM32_LCD_CS);       /* ST7567 chip select */
 #endif
@@ -146,6 +150,13 @@ void stm32_spi1select(FAR struct spi_dev_s *dev, uint32_t devid,
     }
 #endif
 
+#ifdef CONFIG_LCD_MAX7219
+  if (devid == SPIDEV_DISPLAY(0))
+    {
+      stm32_gpiowrite(STM32_LCD_CS, !selected);
+    }
+#endif
+
 #ifdef CONFIG_LCD_PCD8544
   if (devid == SPIDEV_DISPLAY(0))
     {