nucleo-g431rb: add PWM example

boards/arm/stm32/nucleo-g431rb/configs/pwm/defconfig

@@ -0,0 +1,65 @@
+#
+# 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="arm"
+CONFIG_ARCH_BOARD="nucleo-g431rb"
+CONFIG_ARCH_BOARD_NUCLEO_G431RB=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32G431R=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=5483
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEFAULT_SMALL=y
+CONFIG_EXAMPLES_PWM=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_MAX_TASKS=16
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=1024
+CONFIG_NSH_LINELEN=80
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_PWM=y
+CONFIG_PWM_MULTICHAN=y
+CONFIG_PWM_NCHANNELS=4
+CONFIG_RAM_SIZE=22528
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_HPWORKPRIORITY=192
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SERIAL_TERMIOS=y
+CONFIG_START_DAY=5
+CONFIG_START_MONTH=7
+CONFIG_START_YEAR=2011
+CONFIG_STM32_DISABLE_IDLE_SLEEP_DURING_DEBUG=y
+CONFIG_STM32_FORCEPOWER=y
+CONFIG_STM32_JTAG_FULL_ENABLE=y
+CONFIG_STM32_PWM_MULTICHAN=y
+CONFIG_STM32_TIM1=y
+CONFIG_STM32_TIM1_CH1NOUT=y
+CONFIG_STM32_TIM1_CH1OUT=y
+CONFIG_STM32_TIM1_CH2NOUT=y
+CONFIG_STM32_TIM1_CH2OUT=y
+CONFIG_STM32_TIM1_CH3NOUT=y
+CONFIG_STM32_TIM1_CH3OUT=y
+CONFIG_STM32_TIM1_CH4OUT=y
+CONFIG_STM32_TIM1_CHANNEL1=y
+CONFIG_STM32_TIM1_CHANNEL2=y
+CONFIG_STM32_TIM1_CHANNEL3=y
+CONFIG_STM32_TIM1_CHANNEL4=y
+CONFIG_STM32_TIM1_PWM=y
+CONFIG_STM32_USART2=y
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USART2_SERIAL_CONSOLE=y
+CONFIG_USER_ENTRYPOINT="nsh_main"

boards/arm/stm32/nucleo-g431rb/include/board.h

@@ -120,6 +120,45 @@
 #define STM32_RCC_CFGR_PPRE2           RCC_CFGR_PPRE2_HCLK
 #define STM32_PCLK2_FREQUENCY          STM32_HCLK_FREQUENCY
 
+/* APB2 timers 1, 8, 20 and 15-17 will receive PCLK2. */
+
+/* Timers driven from APB2 will be PCLK2 */
+
+#define STM32_APB2_TIM1_CLKIN   (STM32_PCLK2_FREQUENCY)
+#define STM32_APB2_TIM8_CLKIN   (STM32_PCLK2_FREQUENCY)
+#define STM32_APB1_TIM15_CLKIN  (STM32_PCLK2_FREQUENCY)
+#define STM32_APB1_TIM16_CLKIN  (STM32_PCLK2_FREQUENCY)
+#define STM32_APB1_TIM17_CLKIN  (STM32_PCLK2_FREQUENCY)
+
+/* APB1 timers 2-7 will be twice PCLK1 */
+
+#define STM32_APB1_TIM2_CLKIN   (STM32_PCLK1_FREQUENCY)
+#define STM32_APB1_TIM3_CLKIN   (STM32_PCLK1_FREQUENCY)
+#define STM32_APB1_TIM4_CLKIN   (STM32_PCLK1_FREQUENCY)
+#define STM32_APB1_TIM6_CLKIN   (STM32_PCLK1_FREQUENCY)
+#define STM32_APB1_TIM7_CLKIN   (STM32_PCLK1_FREQUENCY)
+
+/* USB divider -- Divide PLL clock by 1.5 */
+
+#define STM32_CFGR_USBPRE       0
+
+/* Timer Frequencies, if APBx is set to 1, frequency is same to APBx
+ * otherwise frequency is 2xAPBx.
+ */
+
+#define BOARD_TIM1_FREQUENCY   (STM32_PCLK2_FREQUENCY)
+#define BOARD_TIM2_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM3_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM4_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM5_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM6_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM7_FREQUENCY   (STM32_PCLK1_FREQUENCY)
+#define BOARD_TIM8_FREQUENCY   (STM32_PCLK2_FREQUENCY)
+#define BOARD_TIM15_FREQUENCY  (STM32_PCLK2_FREQUENCY)
+#define BOARD_TIM16_FREQUENCY  (STM32_PCLK2_FREQUENCY)
+#define BOARD_TIM17_FREQUENCY  (STM32_PCLK2_FREQUENCY)
+#define BOARD_TIM20_FREQUENCY  (STM32_PCLK2_FREQUENCY)
+
 /* LED definitions **********************************************************/
 
 /* The NUCLEO-G431RB has four user LEDs.
@@ -187,4 +226,16 @@
 
 /* Pin Multiplexing Disambiguation ******************************************/
 
+/* PWM configuration ********************************************************/
+
+/* TIM1 PWM */
+
+#define GPIO_TIM1_CH1OUT  GPIO_TIM1_CH1OUT_1  /* PA8 */
+#define GPIO_TIM1_CH1NOUT GPIO_TIM1_CH1NOUT_2 /* PA11 */
+#define GPIO_TIM1_CH2OUT  GPIO_TIM1_CH2OUT_1  /* PA9 */
+#define GPIO_TIM1_CH2NOUT GPIO_TIM1_CH2NOUT_1 /* PA12 */
+#define GPIO_TIM1_CH3OUT  GPIO_TIM1_CH3OUT_1  /* PA10 */
+#define GPIO_TIM1_CH3NOUT GPIO_TIM1_CH3NOUT_1 /* PB1 */
+#define GPIO_TIM1_CH4OUT  GPIO_TIM1_CH4OUT_2  /* PC3 */
+
 #endif /* __BOARDS_ARM_STM32_NUCLEO_G431RB_INCLUDE_BOARD_H */

boards/arm/stm32/nucleo-g431rb/src/Make.defs

@@ -33,6 +33,10 @@ ifeq ($(CONFIG_LIB_BOARDCTL),y)
 CSRCS += stm32_appinit.c
 endif
 
+ifeq ($(CONFIG_PWM),y)
+CSRCS += stm32_pwm.c
+endif
+
 DEPPATH += --dep-path board
 VPATH += :board
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board)

boards/arm/stm32/nucleo-g431rb/src/nucleo-g431rb.h

@@ -57,6 +57,10 @@
 
 #define LED_DRIVER_PATH                "/dev/userleds"
 
+/* PWM */
+
+#define NUCLEOG431RB_PWMTIMER   1
+
 /****************************************************************************
  * Public Data
  ****************************************************************************/
@@ -85,4 +89,16 @@
 
 int stm32_bringup(void);
 
+/****************************************************************************
+ * Name: stm32_pwm_setup
+ *
+ * Description:
+ *   Initialize PWM and register the PWM device.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PWM
+int stm32_pwm_setup(void);
+#endif
+
 #endif /* __BOARDS_ARM_STM32_NUCLEO_G431RB_SRC_NUCLEO_G431RB_H */

boards/arm/stm32/nucleo-g431rb/src/stm32_bringup.c

@@ -92,6 +92,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_PWM
+  /* Initialize PWM and register the PWM driver. */
+
+  ret = stm32_pwm_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_pwm_setup failed: %d\n", ret);
+    }
+#endif
+
   UNUSED(ret);
   return OK;
 }

boards/arm/stm32/nucleo-g431rb/src/stm32_pwm.c

@@ -0,0 +1,84 @@
+/****************************************************************************
+ * boards/arm/stm32/nucleo-g431rb/src/stm32_pwm.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/timers/pwm.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "arm_arch.h"
+#include "stm32_pwm.h"
+#include "nucleo-g431rb.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_pwm_setup
+ *
+ * Description:
+ *   Initialize PWM and register the PWM device.
+ *
+ ****************************************************************************/
+
+int stm32_pwm_setup(void)
+{
+  static bool initialized = false;
+  struct pwm_lowerhalf_s *pwm;
+  int ret;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+
+      pwm = stm32_pwminitialize(NUCLEOG431RB_PWMTIMER);
+      if (!pwm)
+        {
+          tmrerr("Failed to get the STM32 PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/pwm0" */
+
+      ret = pwm_register("/dev/pwm0", pwm);
+      if (ret < 0)
+        {
+          tmrerr("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+  return OK;
+}