arm/stm32f401rc-rs485: Add support to WS2812 addressable LED

Signed-off-by: Rodrigo Sim <rcsim10@gmail.com>

Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst

@@ -748,6 +748,27 @@ NSH commands::
        WRITING:
        0000: 1b5b471b5b30304c1b5b4548656c6c6f 204e75747458                     .[G.[00L.[EHello  NuttX
        Test complete
-       nsh> 
+       nsh>
+
+ws2812
+------
+
+This configuration sets up the NuttShell (NSH) interface over USB Serial (refer to the usbserial
+configuration for details). It also enables the driver for an addressable LED WS2812 and the SPI1.
+The MOSI pin from SPI must be connected to DIN on WS2812 module and the number of LEDs can be
+configured using CONFIG_WS2812_LED_COUNT.
+
+
+======= ====
+ WS2812 PINS
+======= ====
+DIN     PA7
+======= ====
+
+NSH commands::
+
+       NuttShell (NSH) NuttX-12.7.0-RC0
+       nsh> ws2812
+
 
        

boards/arm/stm32/stm32f401rc-rs485/configs/ws2812/defconfig

@@ -0,0 +1,68 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_FPU is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="stm32f401rc-rs485"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_STM32F401RC_RS485=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F401RC=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_USBDEVCTRL=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_EXAMPLES_BUTTONS=y
+CONFIG_EXAMPLES_BUTTONS_NAME0="SW3"
+CONFIG_EXAMPLES_BUTTONS_NAME1="SW4"
+CONFIG_EXAMPLES_BUTTONS_NAME2="SW5"
+CONFIG_EXAMPLES_BUTTONS_NAMES=y
+CONFIG_EXAMPLES_BUTTONS_QTD=3
+CONFIG_EXAMPLES_WS2812=y
+CONFIG_EXAMPLES_WS2812_DEFAULT_DEV="/dev/leddrv0"
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INPUT=y
+CONFIG_INPUT_BUTTONS=y
+CONFIG_INPUT_BUTTONS_LOWER=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=98304
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=5
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2014
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_OTGFS=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_SPI1=y
+CONFIG_STM32_USART6=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USBDEV=y
+CONFIG_WS2812=y
+CONFIG_WS2812_FREQUENCY=9000000
+CONFIG_WS2812_LED_COUNT=10

boards/arm/stm32/stm32f401rc-rs485/src/stm32_bringup.c

@@ -83,6 +83,10 @@
 #include "stm32_lcd_backpack.h"
 #endif
 
+#ifdef CONFIG_WS2812
+#include "stm32_ws2812.h"
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -328,5 +332,15 @@ int stm32_bringup(void)
     }
 #endif
 
+#if defined(CONFIG_WS2812) && defined(CONFIG_WS2812_LED_COUNT)
+  /* Configure and initialize the WS2812 LEDs. */
+
+  ret = board_ws2812_initialize(0, WS2812_SPI, CONFIG_WS2812_LED_COUNT);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: board_ws2812_initialize() failed: %d\n", ret);
+    }
+#endif
+
   return ret;
 }

boards/arm/stm32/stm32f401rc-rs485/src/stm32f401rc-rs485.h

@@ -124,6 +124,10 @@
      GPIO_OUTPUT_SET | GPIO_PORTB | GPIO_PIN5)
 #endif
 
+/* WS2812 LEDs SPI */
+
+#define WS2812_SPI 1
+
 /* PWM
  *
  * The STM32F401RC-RS485 has no real on-board PWM devices, but the board can