drivers/lcd: Add support to use APA102 LED Matrix as LCD Display

Co-authored-by: Petro Karashchenko <petro.karashchenko@gmail.com>

drivers/lcd/Kconfig

@@ -100,6 +100,30 @@ config LCD_MAXPOWER
 
 comment "Graphic LCD Devices"
 
+config LCD_APA102
+	bool "APA102 RGB LED MATRIX as LCD"
+	depends on SPI
+	default n
+
+if LCD_APA102
+	config LCD_APA102_XRES
+		int "APA102 X Resolution"
+		default 16
+		---help---
+			Specifies the X resolution of the LCD.
+
+	config LCD_APA102_YRES
+		int "APA102 Y Resolution"
+		default 16
+		---help---
+			Specifies the Y resolution of the LCD.
+
+	config LCD_APA102_FREQUENCY
+		int "SPI Frequency"
+		default 1000000
+
+endif # LCD_APA102
+
 config LCD_P14201
 	bool "Rit P1402 series display"
 	default n

drivers/lcd/Make.defs

@@ -45,6 +45,10 @@ ifeq ($(CONFIG_LCD_LPM013M091A),y)
   CSRCS += lpm013m091a.c
 endif
 
+ifeq ($(CONFIG_LCD_APA102),y)
+  CSRCS += apa102.c
+endif
+
 ifeq ($(CONFIG_LCD_P14201),y)
   CSRCS += p14201.c
 endif

include/nuttx/lcd/apa102.h

@@ -0,0 +1,89 @@
+/****************************************************************************
+ * include/nuttx/lcd/apa102.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_LCD_APA102_H
+#define __INCLUDE_NUTTX_LCD_APA102_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs/ioctl.h>
+
+/* Configuration
+ * CONFIG_SPI - Enables support for SPI drivers
+ * CONFIG_LCD_APA102 - Enables support for the APA102 driver
+ */
+
+#if defined(CONFIG_SPI) && defined(CONFIG_LCD_APA102)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Some important "colors" */
+
+#define APA102_BLACK         0
+#define APA102_WHITE         1
+
+/* Only two power settings are supported: */
+
+#define APA102_POWER_OFF     0
+#define APA102_POWER_ON      1
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: apa102_initialize
+ *
+ * Description:
+ *   Initialize the APA102 device as a LCD interface.
+ *
+ * Input Parameters:
+ *   spi   - An instance of the SPI interface to use to communicate
+ *           with the APA102.
+ *   devno - Device number to identify current display.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+FAR struct lcd_dev_s *apa102_initialize(FAR struct spi_dev_s *spi,
+                                        unsigned int devno);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_SPI && CONFIG_APA102 */
+#endif /* __INCLUDE_NUTTX_LCD_APA102_H */

include/nuttx/leds/apa102.h

@@ -32,8 +32,6 @@
  * CONFIG_LEDS_APA102 - Enables support for the APA102 driver
  */
 
-#if defined(CONFIG_SPI) && defined(CONFIG_LEDS_APA102)
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -95,5 +93,4 @@ int apa102_register(FAR const char *devpath, FAR struct spi_dev_s *spi);
 }
 #endif
 
-#endif /* CONFIG_SPI && CONFIG_LEDS_APA102 */
 #endif /* __INCLUDE_NUTTX_LEDS_APA102_H */