- void wk_tmr4_init(void)
 
- {
 
-   /* add user code begin tmr4_init 0 */
 
 
-   /* add user code end tmr4_init 0 */
 
 
-   gpio_init_type gpio_init_struct;
 
-   tmr_output_config_type tmr_output_struct;
 
 
-   gpio_default_para_init(&gpio_init_struct);
 
 
-   /* add user code begin tmr4_init 1 */
 
-          /* enable gpiod periph clock */
 
-   crm_periph_clock_enable(CRM_GPIOD_PERIPH_CLOCK, TRUE);
 
 
-   /* enable tmr4 periph clock */
 
-   crm_periph_clock_enable(CRM_TMR4_PERIPH_CLOCK, TRUE);
 
-   /* add user code end tmr4_init 1 */
 
 
-   /* configure the tmr4 CH2 pin */
 
-   gpio_init_struct.gpio_pins = GPIO_PINS_13;
 
-   gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
 
-   gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
 
-   gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
 
-   gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
 
-   gpio_init(GPIOD, &gpio_init_struct);
 
 
-   gpio_pin_mux_config(GPIOD, GPIO_PINS_SOURCE13, GPIO_MUX_2);
 
 
-   /* configure the tmr4 CH3 pin */
 
-   gpio_init_struct.gpio_pins = GPIO_PINS_14;
 
-   gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
 
-   gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
 
-   gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
 
-   gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
 
-   gpio_init(GPIOD, &gpio_init_struct);
 
 
-   gpio_pin_mux_config(GPIOD, GPIO_PINS_SOURCE14, GPIO_MUX_2);
 
 
-   /* configure the tmr4 CH4 pin */
 
-   gpio_init_struct.gpio_pins = GPIO_PINS_15;
 
-   gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
 
-   gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
 
-   gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
 
-   gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
 
-   gpio_init(GPIOD, &gpio_init_struct);
 
 
-   gpio_pin_mux_config(GPIOD, GPIO_PINS_SOURCE15, GPIO_MUX_2);
 
 
-   /* configure counter settings */
 
-   tmr_base_init(TMR4, 14999, 0);
 
-   tmr_cnt_dir_set(TMR4, TMR_COUNT_UP);
 
-   tmr_clock_source_div_set(TMR4, TMR_CLOCK_DIV1);
 
-   tmr_period_buffer_enable(TMR4, FALSE);
 
 
-   /* configure primary mode settings */
 
-   tmr_sub_sync_mode_set(TMR4, FALSE);
 
-   tmr_primary_mode_select(TMR4, TMR_PRIMARY_SEL_RESET);
 
 
-   /* configure channel 2 output settings */
 
-   tmr_output_struct.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
 
-   tmr_output_struct.oc_output_state = TRUE;
 
-   tmr_output_struct.occ_output_state = FALSE;
 
-   tmr_output_struct.oc_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.occ_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.oc_idle_state = FALSE;
 
-   tmr_output_struct.occ_idle_state = FALSE;
 
-   tmr_output_channel_config(TMR4, TMR_SELECT_CHANNEL_2, &tmr_output_struct);
 
-   tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_2, 0);
 
-   tmr_output_channel_buffer_enable(TMR4, TMR_SELECT_CHANNEL_2, FALSE);
 
 
-   tmr_output_channel_immediately_set(TMR4, TMR_SELECT_CHANNEL_2, FALSE);
 
 
-   /* configure channel 3 output settings */
 
-   tmr_output_struct.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
 
-   tmr_output_struct.oc_output_state = TRUE;
 
-   tmr_output_struct.occ_output_state = FALSE;
 
-   tmr_output_struct.oc_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.occ_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.oc_idle_state = FALSE;
 
-   tmr_output_struct.occ_idle_state = FALSE;
 
-   tmr_output_channel_config(TMR4, TMR_SELECT_CHANNEL_3, &tmr_output_struct);
 
-   tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_3, 0);
 
-   tmr_output_channel_buffer_enable(TMR4, TMR_SELECT_CHANNEL_3, FALSE);
 
 
-   tmr_output_channel_immediately_set(TMR4, TMR_SELECT_CHANNEL_3, FALSE);
 
 
-   /* configure channel 4 output settings */
 
-   tmr_output_struct.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
 
-   tmr_output_struct.oc_output_state = TRUE;
 
-   tmr_output_struct.occ_output_state = FALSE;
 
-   tmr_output_struct.oc_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.occ_polarity = TMR_OUTPUT_ACTIVE_LOW;
 
-   tmr_output_struct.oc_idle_state = FALSE;
 
-   tmr_output_struct.occ_idle_state = FALSE;
 
-   tmr_output_channel_config(TMR4, TMR_SELECT_CHANNEL_4, &tmr_output_struct);
 
-   tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_4, 0);
 
-   tmr_output_channel_buffer_enable(TMR4, TMR_SELECT_CHANNEL_4, FALSE);
 
 
-   tmr_output_channel_immediately_set(TMR4, TMR_SELECT_CHANNEL_4, FALSE);
 
 
 
-   tmr_counter_enable(TMR4, TRUE);
 
 
-   /* add user code begin tmr4_init 2 */
 
 
-   /* add user code end tmr4_init 2 */
 
- }
创建三个任务,实现三个灯的交替呼吸。创建三个信量,实现三个PWM呼着灯的交替工作。
- /* led2 task function */
 
- void led2_task_function(void *pvParameters)
 
- {
 
-         uint32_t tmr_channel_value;
 
-         uint8_t f;
 
-         BaseType_t xReturn = pdPASS;/* 定义一个创建信息返回值,默认为 pdPASS */ 
 
-         xSemaphoreGive( xBinarySemaphorePWM1 );//给出二值信号量
 
-   while(1)
 
-   {
 
-                 //获取二值信号量 xSemaphore,没获取到则一直等待 
 
-     xReturn = xSemaphoreTake(xBinarySemaphorePWM1,/* 二值信号量句柄 */ 
 
-                                 portMAX_DELAY); /* 等待时间 */
 
-     for(f=0; f<180; f++)
 
-                 {
 
-                         tmr_channel_value = (uint32_t)(14999*cos(f*3.14/180));
 
-                         tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_2, tmr_channel_value);
 
-                         vTaskDelay(10);
 
-                 }
 
-                 tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_2, tmr_channel_value);
 
-                 xSemaphoreGive( xBinarySemaphorePWM2 );//给出二值信号量
 
-   }
 
- }
 
 
- /* led3 task function */
 
- void led3_task_function(void *pvParameters)
 
- {
 
-         BaseType_t xReturn = pdPASS;/* 定义一个创建信息返回值,默认为 pdPASS */ 
 
-         uint32_t tmr_channel_value;
 
-         uint8_t f;
 
-   while(1)
 
-   {
 
-                 //获取二值信号量 xSemaphore,没获取到则一直等待
 
-                          
 
-     xReturn = xSemaphoreTake(xBinarySemaphorePWM2,/* 二值信号量句柄 */ 
 
-                                 portMAX_DELAY); /* 等待时间 */
 
-     for(f=0; f<180; f++)
 
-                 {
 
-                         tmr_channel_value = (uint32_t)(14999*sin(f*3.14/180));
 
-                         tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_3, tmr_channel_value);
 
-                         vTaskDelay(10);
 
-                 }
 
-                 tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_3, 0);
 
-                 xSemaphoreGive( xBinarySemaphorePWM3 );//给出二值信号量
 
-   }
 
- }
 
 
- /* led3 task function */
 
- void led4_task_function(void *pvParameters)
 
- {
 
-         BaseType_t xReturn = pdPASS;/* 定义一个创建信息返回值,默认为 pdPASS */ 
 
-         uint32_t tmr_channel_value;
 
-         uint8_t f;
 
-   while(1)
 
-   {
 
-                 //获取二值信号量 xSemaphore,没获取到则一直等待
 
-                          
 
-     xReturn = xSemaphoreTake(xBinarySemaphorePWM3,/* 二值信号量句柄 */ 
 
-                                 portMAX_DELAY); /* 等待时间 */
 
-     for(f=0; f<180; f++)
 
-                 {
 
-                         tmr_channel_value = (uint32_t)(14999*sin(f*3.14/180));
 
-                         tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_4, tmr_channel_value);
 
-                         vTaskDelay(10);
 
-                 }
 
-                 tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_4, 0);
 
-                 xSemaphoreGive( xBinarySemaphorePWM1 );//给出二值信号量
 
-   }
 
- }
在主程序中开始三个任务,任务中等待其的任务发出信号量,来实现工作。
/**
  * @brief  main function.
  * @param  none
  * @retval none
  */
int main(void)
{
  system_clock_config();
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
        wk_tmr4_init();
  /* init usart1 */
  uart_print_init(115200);
        xBinarySemaphorePWM1 = xSemaphoreCreateBinary();//创建信号量
        if (NULL != xBinarySemaphorePWM1) 
    {
        printf("BinarySem_Handle 二值信号量1创建成功!\r\n"); 
    }
        xBinarySemaphorePWM2 = xSemaphoreCreateBinary();//创建信号量
        if (NULL != xBinarySemaphorePWM2) 
    {
        printf("BinarySem_Handle 二值信号量2创建成功!\r\n"); 
    }
        xBinarySemaphorePWM3 = xSemaphoreCreateBinary();//创建信号量
        if (NULL != xBinarySemaphorePWM3) 
    {
        printf("BinarySem_Handle 二值信号量3创建成功!\r\n"); 
    }
  /* enter critical */
  taskENTER_CRITICAL();
  /* create led2 task */
  if(xTaskCreate((TaskFunction_t )led2_task_function,
                 (const char*    )"LED2_task",
                 (uint16_t       )512,
                 (void*          )NULL,
                 (UBaseType_t    )2,
                 (TaskHandle_t*  )&led2_handler) != pdPASS)
  {
    printf("LED2 task could not be created as there was insufficient heap memory remaining.\r\n");
  }
  else
  {
    printf("LED2 task was created successfully.\r\n");
  }
  /* create led3 task */
  if(xTaskCreate((TaskFunction_t )led3_task_function,
                 (const char*    )"LED3_task",
                 (uint16_t       )512,
                 (void*          )NULL,
                 (UBaseType_t    )2,
                 (TaskHandle_t*  )&led3_handler) != pdPASS)
  {
    printf("LED3 task could not be created as there was insufficient heap memory remaining.\r\n");
  }
  else
  {
    printf("LED3 task was created successfully.\r\n");
  }
  /* create led3 task */
  if(xTaskCreate((TaskFunction_t )led4_task_function,
                 (const char*    )"LED4_task",
                 (uint16_t       )512,
                 (void*          )NULL,
                 (UBaseType_t    )2,
                 (TaskHandle_t*  )&led4_handler) != pdPASS)
  {
    printf("LED4 task could not be created as there was insufficient heap memory remaining.\r\n");
  }
  else
  {
    printf("LED4 task was created successfully.\r\n");
  }
  /* exit critical */
  taskEXIT_CRITICAL();
  /* start scheduler */
  vTaskStartScheduler();
}
实现交替的呼吸流水灯:
【小结】
此工程实现了定时器的驱动,同时应用信号量来实现三个任务的交替运行呼吸灯。开程提供了FreeRTOS的移植、信号量的创建,任务之间的信号传递,实现了不一样的流水灯效果。