BlackPill buttons example

Description:
Example to interact with KEY button and user external button connected to PA1.
For KEY button pull-up resistor is active, board schematic does not show any pull-up or pull-down resistor.

Results: Example working as expected.

BlackPill PWM example

Description:
PWM example using PB0 - Timer3 - Channel 3
Create default configuration for the example.

Controlling_RGB_LED

Description: Controlling a RGB LED on NuttX for Black Pill board [STM32F411]

Note: Example currently not working as expected.

boards/arm/stm32/stm32f411-minimum/configs/pwm/defconfig

@@ -0,0 +1,53 @@
+#
+# 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_DISABLE_OS_API 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_STM32_SYSCFG is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="stm32f411-minimum"
+CONFIG_ARCH_BOARD_STM32F411_MINIMUM=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F411CE=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_EXAMPLES_PWM=y
+CONFIG_HAVE_CXX=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+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_PWM=y
+CONFIG_RAM_SIZE=131072
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2020
+CONFIG_STM32_FLASH_CONFIG_E=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_TIM3=y
+CONFIG_STM32_TIM3_CH3OUT=y
+CONFIG_STM32_TIM3_CHANNEL=3
+CONFIG_STM32_TIM3_PWM=y
+CONFIG_STM32_USART1=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USART1_SERIAL_CONSOLE=y

boards/arm/stm32/stm32f411-minimum/configs/rgbled/defconfig

@@ -0,0 +1,69 @@
+#
+# 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_DISABLE_OS_API 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_STM32_SYSCFG is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="stm32f411-minimum"
+CONFIG_ARCH_BOARD_STM32F411_MINIMUM=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F411CE=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_EXAMPLES_RGBLED=y
+CONFIG_HAVE_CXX=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+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_PWM=y
+CONFIG_RAM_SIZE=131072
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RGBLED=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2020
+CONFIG_STM32_FLASH_CONFIG_E=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_TIM1=y
+CONFIG_STM32_TIM1_CH1OUT=y
+CONFIG_STM32_TIM1_CHMODE=0
+CONFIG_STM32_TIM1_PWM=y
+CONFIG_STM32_TIM2=y
+CONFIG_STM32_TIM2_CH2OUT=y
+CONFIG_STM32_TIM2_CHANNEL=2
+CONFIG_STM32_TIM2_CHMODE=0
+CONFIG_STM32_TIM2_PWM=y
+CONFIG_STM32_TIM3=y
+CONFIG_STM32_TIM3_CH3OUT=y
+CONFIG_STM32_TIM3_CHANNEL=3
+CONFIG_STM32_TIM3_CHMODE=0
+CONFIG_STM32_TIM3_PWM=y
+CONFIG_STM32_TIM4=y
+CONFIG_STM32_TIM4_CH4OUT=y
+CONFIG_STM32_TIM4_CHANNEL=4
+CONFIG_STM32_TIM4_CHMODE=0
+CONFIG_STM32_TIM4_PWM=y
+CONFIG_STM32_USART1=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USART1_SERIAL_CONSOLE=y

boards/arm/stm32/stm32f411-minimum/include/board.h

@@ -250,6 +250,30 @@
 #define GPIO_USART6_RX   GPIO_USART6_RX_1    /* PC7 */
 #define GPIO_USART6_TX   GPIO_USART6_TX_1    /* PC6 */
 
+/* PWM
+ *
+ * The STM32F4 Discovery has no real on-board PWM devices, but the board
+ * can be configured to output a pulse train using TIM4 CH2 on PD13.
+ */
+#define GPIO_TIM1_CH1OUT  GPIO_TIM1_CH1OUT_1 //PA8
+#define GPIO_TIM2_CH2OUT  GPIO_TIM2_CH2OUT_1 //PA1
+#define GPIO_TIM3_CH3OUT  GPIO_TIM3_CH3OUT_1 //PB0
+#define GPIO_TIM4_CH4OUT  GPIO_TIM4_CH4OUT_1 //PB9
+
+/* RGB LED
+ *
+ * R = TIM1 CH1 on PA8 | G = TIM2 CH2 on PA1 | B = TIM4 CH4 on PB9
+ *
+ * Note: Pin boards: GPIO_TIM1_CH1OUT ; GPIO_TIM2_CH2OUT ; GPIO_TIM4_CH4OUT
+ */
+
+#define RGBLED_RPWMTIMER   1
+#define RGBLED_RPWMCHANNEL 1
+#define RGBLED_GPWMTIMER   2
+#define RGBLED_GPWMCHANNEL 2
+#define RGBLED_BPWMTIMER   4
+#define RGBLED_BPWMCHANNEL 4
+
 /* UART RX DMA configurations */
 
 #define DMAMAP_USART1_RX DMAMAP_USART1_RX_2
@@ -321,8 +345,10 @@
  */
 
 #define BUTTON_USER        0
-#define NUM_BUTTONS        1
+#define BUTTON_EXTERNAL    1  //External user button connected to PA1
+#define NUM_BUTTONS        2
 
-#define BUTTON_USER_BIT    (1 << BUTTON_USER)
+#define BUTTON_USER_BIT       (1 << BUTTON_USER)
+#define BUTTON_EXTERNAL_BIT    (1 << BUTTON_EXTERNAL)
 
 #endif /* __BOARDS_ARM_STM32_STM32F411_MINIMUM_INCLUDE_BOARD_H */

boards/arm/stm32/stm32f411-minimum/src/CMakeLists.txt

@@ -32,6 +32,18 @@ if(CONFIG_USERLED)
   list(APPEND SRCS stm32_userleds.c)
 endif()
 
+if(CONFIG_ARCH_BUTTONS)
+  list(APPEND SRCS stm32_buttons.c)
+endif()
+
+if(CONFIG_PWM)
+  list(APPEND SRCS stm32_pwm.c)
+endif()
+
+if(CONFIG_RGBLED)
+  list(APPEND SRCS stm32_rgbled.c)
+endif()
+
 if(CONFIG_SPI)
   list(APPEND SRCS stm32_spi.c)
 endif()

boards/arm/stm32/stm32f411-minimum/src/Make.defs

@@ -34,6 +34,18 @@ ifeq ($(CONFIG_USERLED),y)
   CSRCS += stm32_userleds.c
 endif
 
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+  CSRCS += stm32_buttons.c
+endif
+
+ifeq ($(CONFIG_PWM),y)
+  CSRCS += stm32_pwm.c
+endif
+
+ifeq ($(CONFIG_RGBLED),y)
+  CSRCS += stm32_rgbled.c
+endif
+
 ifeq ($(CONFIG_ADC_HX711),y)
   CSRCS += stm32_hx711.c
 endif

boards/arm/stm32/stm32f411-minimum/src/stm32_bringup.c

@@ -34,6 +34,10 @@
 #  include <nuttx/leds/userled.h>
 #endif
 
+#ifdef CONFIG_INPUT_BUTTONS
+#  include <nuttx/input/buttons.h>
+#endif
+
 #ifdef CONFIG_STM32_OTGFS
 #  include "stm32_usbhost.h"
 #endif
@@ -98,6 +102,36 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_INPUT_BUTTONS
+  /* Register the BUTTON driver */
+
+  ret = btn_lower_initialize("/dev/buttons");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: btn_lower_initialize() failed: %d\n", ret);
+    }
+#endif
+
+#ifdef CONFIG_PWM
+  /* Initialize PWM and register the PWM device. */
+
+  ret = stm32_pwm_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_pwm_setup() failed: %d\n", ret);
+    }
+#endif
+
+#ifdef CONFIG_RGBLED
+  /* Configure and initialize the RGB LED. */
+
+  ret = stm32_rgbled_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_rgbled_setup() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_STM32F411MINIMUM_GPIO
   ret = stm32_gpio_initialize();
   if (ret != OK)