修复了pwm互补输出的一些bug，并在finsh中添加使用说明 (#6191)

* Fix the bug of complementary output

bsp/stm32/libraries/HAL_Drivers/config/f4/pwm_config.h

@@ -17,6 +17,17 @@
 extern "C" {
 #endif
 
+#ifdef BSP_USING_PWM1
+#ifndef PWM1_CONFIG
+#define PWM1_CONFIG                             \
+    {                                           \
+       .tim_handle.Instance     = TIM1,         \
+       .name                    = "pwm1",       \
+       .channel                 = 0             \
+    }
+#endif /* PWM1_CONFIG */
+#endif /* BSP_USING_PWM1 */
+
 #ifdef BSP_USING_PWM2
 #ifndef PWM2_CONFIG
 #define PWM2_CONFIG                             \

bsp/stm32/stm32f401-st-nucleo/board/CubeMX_Config/CubeMX_Config.ioc

@@ -12,35 +12,38 @@ Mcu.Family=STM32F4
 Mcu.IP0=ADC1
 Mcu.IP1=NVIC
 Mcu.IP2=RCC
-Mcu.IP3=SPI1
-Mcu.IP4=SYS
+Mcu.IP3=SYS
+Mcu.IP4=TIM1
 Mcu.IP5=TIM2
 Mcu.IP6=TIM3
-Mcu.IP7=TIM11
-Mcu.IP8=USART2
-Mcu.IPNb=9
+Mcu.IP7=TIM4
+Mcu.IP8=TIM11
+Mcu.IP9=USART2
+Mcu.IPNb=10
 Mcu.Name=STM32F401R(D-E)Tx
 Mcu.Package=LQFP64
 Mcu.Pin0=PC14-OSC32_IN
 Mcu.Pin1=PC15-OSC32_OUT
 Mcu.Pin10=PA4
-Mcu.Pin11=PA5
-Mcu.Pin12=PA6
-Mcu.Pin13=PA7
-Mcu.Pin14=PB0
-Mcu.Pin15=PB10
-Mcu.Pin16=PC7
-Mcu.Pin17=PA13
-Mcu.Pin18=PA14
-Mcu.Pin19=PB3
+Mcu.Pin11=PA7
+Mcu.Pin12=PB0
+Mcu.Pin13=PB10
+Mcu.Pin14=PC7
+Mcu.Pin15=PA8
+Mcu.Pin16=PA13
+Mcu.Pin17=PA14
+Mcu.Pin18=PB3
+Mcu.Pin19=PB4
 Mcu.Pin2=PH0 - OSC_IN
-Mcu.Pin20=PB4
+Mcu.Pin20=PB6
 Mcu.Pin21=VP_ADC1_TempSens_Input
 Mcu.Pin22=VP_ADC1_Vref_Input
 Mcu.Pin23=VP_SYS_VS_Systick
-Mcu.Pin24=VP_TIM2_VS_ClockSourceINT
-Mcu.Pin25=VP_TIM3_VS_ClockSourceINT
-Mcu.Pin26=VP_TIM11_VS_ClockSourceINT
+Mcu.Pin24=VP_TIM1_VS_ClockSourceINT
+Mcu.Pin25=VP_TIM2_VS_ClockSourceINT
+Mcu.Pin26=VP_TIM3_VS_ClockSourceINT
+Mcu.Pin27=VP_TIM4_VS_ClockSourceINT
+Mcu.Pin28=VP_TIM11_VS_ClockSourceINT
 Mcu.Pin3=PH1 - OSC_OUT
 Mcu.Pin4=PC0
 Mcu.Pin5=PC1
@@ -48,7 +51,7 @@ Mcu.Pin6=PA0-WKUP
 Mcu.Pin7=PA1
 Mcu.Pin8=PA2
 Mcu.Pin9=PA3
-Mcu.PinsNb=27
+Mcu.PinsNb=29
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32F401RETx
@@ -85,13 +88,9 @@ PA3.Mode=Asynchronous
 PA3.Signal=USART2_RX
 PA4.Locked=true
 PA4.Signal=ADCx_IN4
-PA5.Locked=true
-PA5.Mode=Full_Duplex_Master
-PA5.Signal=SPI1_SCK
-PA6.Mode=Full_Duplex_Master
-PA6.Signal=SPI1_MISO
-PA7.Mode=Full_Duplex_Master
-PA7.Signal=SPI1_MOSI
+PA7.Mode=Output Compare1 CH1 CH1N
+PA7.Signal=TIM1_CH1N
+PA8.Signal=S_TIM1_CH1
 PB0.Locked=true
 PB0.Signal=ADCx_IN8
 PB10.Locked=true
@@ -100,6 +99,7 @@ PB3.Locked=true
 PB3.Signal=S_TIM2_CH2
 PB4.Locked=true
 PB4.Signal=S_TIM3_CH1
+PB6.Signal=S_TIM4_CH1
 PC0.Locked=true
 PC0.Signal=ADCx_IN10
 PC1.Locked=true
@@ -183,6 +183,8 @@ SH.ADCx_IN4.0=ADC1_IN4,IN4
 SH.ADCx_IN4.ConfNb=1
 SH.ADCx_IN8.0=ADC1_IN8,IN8
 SH.ADCx_IN8.ConfNb=1
+SH.S_TIM1_CH1.0=TIM1_CH1,Output Compare1 CH1 CH1N
+SH.S_TIM1_CH1.ConfNb=1
 SH.S_TIM2_CH2.0=TIM2_CH2,PWM Generation2 CH2
 SH.S_TIM2_CH2.ConfNb=1
 SH.S_TIM2_CH3.0=TIM2_CH3,PWM Generation3 CH3
@@ -191,16 +193,18 @@ SH.S_TIM3_CH1.0=TIM3_CH1,PWM Generation1 CH1
 SH.S_TIM3_CH1.ConfNb=1
 SH.S_TIM3_CH2.0=TIM3_CH2,PWM Generation2 CH2
 SH.S_TIM3_CH2.ConfNb=1
-SPI1.Direction=SPI_DIRECTION_2LINES
-SPI1.IPParameters=VirtualType,Mode,Direction
-SPI1.Mode=SPI_MODE_MASTER
-SPI1.VirtualType=VM_MASTER
+SH.S_TIM4_CH1.0=TIM4_CH1,PWM Generation1 CH1
+SH.S_TIM4_CH1.ConfNb=1
+TIM1.Channel-Output\ Compare1\ CH1\ CH1N=TIM_CHANNEL_1
+TIM1.IPParameters=Channel-Output Compare1 CH1 CH1N
 TIM2.Channel-PWM\ Generation2\ CH2=TIM_CHANNEL_2
 TIM2.Channel-PWM\ Generation3\ CH3=TIM_CHANNEL_3
 TIM2.IPParameters=Channel-PWM Generation2 CH2,Channel-PWM Generation3 CH3
 TIM3.Channel-PWM\ Generation1\ CH1=TIM_CHANNEL_1
 TIM3.Channel-PWM\ Generation2\ CH2=TIM_CHANNEL_2
 TIM3.IPParameters=Channel-PWM Generation1 CH1,Channel-PWM Generation2 CH2
+TIM4.Channel-PWM\ Generation1\ CH1=TIM_CHANNEL_1
+TIM4.IPParameters=Channel-PWM Generation1 CH1
 USART2.IPParameters=VirtualMode
 USART2.VirtualMode=VM_ASYNC
 VP_ADC1_TempSens_Input.Mode=IN-TempSens
@@ -211,8 +215,12 @@ VP_SYS_VS_Systick.Mode=SysTick
 VP_SYS_VS_Systick.Signal=SYS_VS_Systick
 VP_TIM11_VS_ClockSourceINT.Mode=Enable_Timer
 VP_TIM11_VS_ClockSourceINT.Signal=TIM11_VS_ClockSourceINT
+VP_TIM1_VS_ClockSourceINT.Mode=Internal
+VP_TIM1_VS_ClockSourceINT.Signal=TIM1_VS_ClockSourceINT
 VP_TIM2_VS_ClockSourceINT.Mode=Internal
 VP_TIM2_VS_ClockSourceINT.Signal=TIM2_VS_ClockSourceINT
 VP_TIM3_VS_ClockSourceINT.Mode=Internal
 VP_TIM3_VS_ClockSourceINT.Signal=TIM3_VS_ClockSourceINT
+VP_TIM4_VS_ClockSourceINT.Mode=Internal
+VP_TIM4_VS_ClockSourceINT.Signal=TIM4_VS_ClockSourceINT
 board=custom

bsp/stm32/stm32f401-st-nucleo/board/CubeMX_Config/Inc/stm32f4xx_hal_conf.h

@@ -62,7 +62,7 @@
 /* #define HAL_SAI_MODULE_ENABLED   */
 /* #define HAL_SD_MODULE_ENABLED   */
 /* #define HAL_MMC_MODULE_ENABLED   */
-#define HAL_SPI_MODULE_ENABLED
+/* #define HAL_SPI_MODULE_ENABLED   */
 #define HAL_TIM_MODULE_ENABLED
 #define HAL_UART_MODULE_ENABLED
 /* #define HAL_USART_MODULE_ENABLED   */

bsp/stm32/stm32f401-st-nucleo/board/CubeMX_Config/Src/stm32f4xx_hal_msp.c

@@ -80,7 +80,7 @@
 /* USER CODE END 0 */
 
 void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
-                                        /**
+  /**
   * Initializes the Global MSP.
   */
 void HAL_MspInit(void)
@@ -187,81 +187,25 @@ void HAL_ADC_MspDeInit(ADC_HandleTypeDef* hadc)
 }
 
 /**
-* @brief SPI MSP Initialization
+* @brief TIM_Base MSP Initialization
 * This function configures the hardware resources used in this example
-* @param hspi: SPI handle pointer
+* @param htim_base: TIM_Base handle pointer
 * @retval None
 */
-void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi)
+void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
 {
-  GPIO_InitTypeDef GPIO_InitStruct = {0};
-  if(hspi->Instance==SPI1)
+  if(htim_base->Instance==TIM1)
   {
-  /* USER CODE BEGIN SPI1_MspInit 0 */
+  /* USER CODE BEGIN TIM1_MspInit 0 */
 
-  /* USER CODE END SPI1_MspInit 0 */
+  /* USER CODE END TIM1_MspInit 0 */
     /* Peripheral clock enable */
-    __HAL_RCC_SPI1_CLK_ENABLE();
-
-    __HAL_RCC_GPIOA_CLK_ENABLE();
-    /**SPI1 GPIO Configuration
-    PA5     ------> SPI1_SCK
-    PA6     ------> SPI1_MISO
-    PA7     ------> SPI1_MOSI
-    */
-    GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
-    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-    GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
-    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
-    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    __HAL_RCC_TIM1_CLK_ENABLE();
+  /* USER CODE BEGIN TIM1_MspInit 1 */
 
-  /* USER CODE BEGIN SPI1_MspInit 1 */
-
-  /* USER CODE END SPI1_MspInit 1 */
+  /* USER CODE END TIM1_MspInit 1 */
   }
-
-}
-
-/**
-* @brief SPI MSP De-Initialization
-* This function freeze the hardware resources used in this example
-* @param hspi: SPI handle pointer
-* @retval None
-*/
-void HAL_SPI_MspDeInit(SPI_HandleTypeDef* hspi)
-{
-  if(hspi->Instance==SPI1)
-  {
-  /* USER CODE BEGIN SPI1_MspDeInit 0 */
-
-  /* USER CODE END SPI1_MspDeInit 0 */
-    /* Peripheral clock disable */
-    __HAL_RCC_SPI1_CLK_DISABLE();
-
-    /**SPI1 GPIO Configuration
-    PA5     ------> SPI1_SCK
-    PA6     ------> SPI1_MISO
-    PA7     ------> SPI1_MOSI
-    */
-    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7);
-
-  /* USER CODE BEGIN SPI1_MspDeInit 1 */
-
-  /* USER CODE END SPI1_MspDeInit 1 */
-  }
-
-}
-
-/**
-* @brief TIM_Base MSP Initialization
-* This function configures the hardware resources used in this example
-* @param htim_base: TIM_Base handle pointer
-* @retval None
-*/
-void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
-{
-  if(htim_base->Instance==TIM2)
+  else if(htim_base->Instance==TIM2)
   {
   /* USER CODE BEGIN TIM2_MspInit 0 */
 
@@ -283,6 +227,17 @@ void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
 
   /* USER CODE END TIM3_MspInit 1 */
   }
+  else if(htim_base->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspInit 0 */
+
+  /* USER CODE END TIM4_MspInit 0 */
+    /* Peripheral clock enable */
+    __HAL_RCC_TIM4_CLK_ENABLE();
+  /* USER CODE BEGIN TIM4_MspInit 1 */
+
+  /* USER CODE END TIM4_MspInit 1 */
+  }
   else if(htim_base->Instance==TIM11)
   {
   /* USER CODE BEGIN TIM11_MspInit 0 */
@@ -300,11 +255,33 @@ void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
 void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
 {
   GPIO_InitTypeDef GPIO_InitStruct = {0};
-  if(htim->Instance==TIM2)
+  if(htim->Instance==TIM1)
+  {
+  /* USER CODE BEGIN TIM1_MspPostInit 0 */
+
+  /* USER CODE END TIM1_MspPostInit 0 */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    /**TIM1 GPIO Configuration
+    PA7     ------> TIM1_CH1N
+    PA8     ------> TIM1_CH1
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_8;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  /* USER CODE BEGIN TIM1_MspPostInit 1 */
+
+  /* USER CODE END TIM1_MspPostInit 1 */
+  }
+  else if(htim->Instance==TIM2)
   {
   /* USER CODE BEGIN TIM2_MspPostInit 0 */
 
   /* USER CODE END TIM2_MspPostInit 0 */
+
     __HAL_RCC_GPIOB_CLK_ENABLE();
     /**TIM2 GPIO Configuration
     PB10     ------> TIM2_CH3
@@ -351,6 +328,27 @@ void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
 
   /* USER CODE END TIM3_MspPostInit 1 */
   }
+  else if(htim->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspPostInit 0 */
+
+  /* USER CODE END TIM4_MspPostInit 0 */
+
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    /**TIM4 GPIO Configuration
+    PB6     ------> TIM4_CH1
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_6;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+  /* USER CODE BEGIN TIM4_MspPostInit 1 */
+
+  /* USER CODE END TIM4_MspPostInit 1 */
+  }
 
 }
 /**
@@ -361,7 +359,18 @@ void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
 */
 void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
 {
-  if(htim_base->Instance==TIM2)
+  if(htim_base->Instance==TIM1)
+  {
+  /* USER CODE BEGIN TIM1_MspDeInit 0 */
+
+  /* USER CODE END TIM1_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_TIM1_CLK_DISABLE();
+  /* USER CODE BEGIN TIM1_MspDeInit 1 */
+
+  /* USER CODE END TIM1_MspDeInit 1 */
+  }
+  else if(htim_base->Instance==TIM2)
   {
   /* USER CODE BEGIN TIM2_MspDeInit 0 */
 
@@ -383,6 +392,17 @@ void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
 
   /* USER CODE END TIM3_MspDeInit 1 */
   }
+  else if(htim_base->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspDeInit 0 */
+
+  /* USER CODE END TIM4_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_TIM4_CLK_DISABLE();
+  /* USER CODE BEGIN TIM4_MspDeInit 1 */
+
+  /* USER CODE END TIM4_MspDeInit 1 */
+  }
   else if(htim_base->Instance==TIM11)
   {
   /* USER CODE BEGIN TIM11_MspDeInit 0 */

bsp/stm32/stm32f401-st-nucleo/board/Kconfig

@@ -22,12 +22,16 @@ menu "Onboard Peripheral Drivers"
         select BSP_USING_ADC
         select BSP_USING_ADC1
         select BSP_USING_PWM
+        select BSP_USING_PWM1
+        select BSP_USING_PWM1_CH1
         select BSP_USING_PWM2
         select BSP_USING_PWM2_CH2
         select BSP_USING_PWM2_CH3
         select BSP_USING_PWM3
         select BSP_USING_PWM3_CH1
         select BSP_USING_PWM3_CH2
+        select BSP_USING_PWM4
+        select BSP_USING_PWM4_CH1
         select BSP_USING_I2C
         select BSP_USING_I2C1
         imply RTDUINO_USING_SERVO
@@ -86,6 +90,15 @@ menu "On-chip Peripheral Drivers"
         select RT_USING_PWM
 
         if BSP_USING_PWM
+            menuconfig BSP_USING_PWM1
+                bool "Enable timer1 output PWM"
+                default n
+                if BSP_USING_PWM1
+                    config BSP_USING_PWM1_CH1
+                        bool "Enable PWM1 channel1"
+                        default n
+                endif
+
             menuconfig BSP_USING_PWM2
                 bool "Enable timer2 output PWM"
                 default n
@@ -111,6 +124,15 @@ menu "On-chip Peripheral Drivers"
                         bool "Enable PWM3 channel2"
                         default n
                 endif
+            
+            menuconfig BSP_USING_PWM4
+                bool "Enable timer4 output PWM"
+                default n
+                if BSP_USING_PWM4
+                    config BSP_USING_PWM4_CH1
+                        bool "Enable PWM4 channel1"
+                        default n
+                endif
         endif
 
     menuconfig BSP_USING_SPI

components/drivers/misc/rt_drv_pwm.c

@@ -7,6 +7,7 @@
  * Date           Author       Notes
  * 2018-05-07     aozima       the first version
  * 2022-05-14     Stanley Lwin add pwm function
+ * 2022-07-25     liYony       fix complementary outputs and add usage information in finsh
  */
 
 #include <rtdevice.h>
@@ -37,7 +38,7 @@ static rt_size_t _pwm_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_
     rt_uint32_t *pulse = (rt_uint32_t *)buffer;
     struct rt_pwm_configuration configuration = {0};
 
-    configuration.channel = pos;
+    configuration.channel = (pos > 0) ? (pos) : (-pos);
 
     if (pwm->ops->control)
     {
@@ -65,7 +66,7 @@ static rt_size_t _pwm_write(rt_device_t dev, rt_off_t pos, const void *buffer, r
     rt_uint32_t *pulse = (rt_uint32_t *)buffer;
     struct rt_pwm_configuration configuration = {0};
 
-    configuration.channel = pos;
+    configuration.channel = (pos > 0) ? (pos) : (-pos);
 
     if (pwm->ops->control)
     {
@@ -169,7 +170,7 @@ rt_err_t rt_pwm_set(struct rt_device_pwm *device, int channel, rt_uint32_t perio
         return -RT_EIO;
     }
 
-    configuration.channel = channel;
+    configuration.channel = (channel > 0) ? (channel) : (-channel);
     configuration.period = period;
     configuration.pulse = pulse;
     result = rt_device_control(&device->parent, PWM_CMD_SET, &configuration);
@@ -187,7 +188,7 @@ rt_err_t rt_pwm_set_period(struct rt_device_pwm *device, int channel, rt_uint32_
         return -RT_EIO;
     }
 
-    configuration.channel = channel;
+    configuration.channel = (channel > 0) ? (channel) : (-channel);
     configuration.period = period;
     result = rt_device_control(&device->parent, PWM_CMD_SET_PERIOD, &configuration);
 
@@ -204,7 +205,7 @@ rt_err_t rt_pwm_set_pulse(struct rt_device_pwm *device, int channel, rt_uint32_t
         return -RT_EIO;
     }
 
-    configuration.channel = channel;
+    configuration.channel = (channel > 0) ? (channel) : (-channel);
     configuration.pulse = pulse;
     result = rt_device_control(&device->parent, PWM_CMD_SET_PULSE, &configuration);
 
@@ -249,7 +250,7 @@ static int pwm(int argc, char **argv)
             }
             else
             {
-                rt_kprintf("pwm probe <device name>  - probe pwm by name\n");
+                rt_kprintf("pwm probe <device name>                  - probe pwm by name\n");
             }
         }
         else
@@ -269,9 +270,11 @@ static int pwm(int argc, char **argv)
                 }
                 else
                 {
-                   rt_kprintf("pwm enable <channel>  - enable pwm channel\n");
+                    rt_kprintf("pwm enable <channel>                     - enable pwm channel\n");
+                    rt_kprintf("    e.g. MSH >pwm enable  1              - PWM_CH1  nomal\n");
+                    rt_kprintf("    e.g. MSH >pwm enable -1              - PWM_CH1N complememtary\n");
                 }
-             }
+            }
             else if(!strcmp(argv[1], "disable"))
             {
                 if(argc == 3)
@@ -280,7 +283,7 @@ static int pwm(int argc, char **argv)
                 }
                 else
                 {
-                    rt_kprintf("pwm disable <channel> - disable pwm channel\n");
+                    rt_kprintf("pwm disable <channel>                    - disable pwm channel\n");
                 }
             }
             else if(!strcmp(argv[1], "get"))
@@ -315,18 +318,18 @@ static int pwm(int argc, char **argv)
 
             else
             {
-                rt_kprintf("pwm get <channel> - get pwm channel info\n");
+                rt_kprintf("pwm get <channel>                        - get pwm channel info\n");
             }
         }
     }
     else
     {
         rt_kprintf("Usage: \n");
-        rt_kprintf("pwm probe <device name> - probe pwm by name\n");
-        rt_kprintf("pwm enable <channel> - enable pwm channel\n");
-        rt_kprintf("pwm disable <channel>- disable pwm channel\n");
-        rt_kprintf("pwm get <channel>    - get pwm channel info\n");
-        rt_kprintf("pwm set <channel> <period> <pulse> - set pwm channel info\n");
+        rt_kprintf("pwm probe   <device name>                - probe pwm by name\n");
+        rt_kprintf("pwm enable  <channel>                    - enable pwm channel\n");
+        rt_kprintf("pwm disable <channel>                    - disable pwm channel\n");
+        rt_kprintf("pwm get     <channel>                    - get pwm channel info\n");
+        rt_kprintf("pwm set     <channel> <period> <pulse>   - set pwm channel info\n");
 
         result = - RT_ERROR;
     }