STM32H7的比较器消隐功能测试

eric2013

消隐功能用于消除尖峰脉冲（Blanking of comparator outputs）




测试例程：COMP_OutputBlanking

反向输入采用的内部参考电压Vrefint = 1.2V左右
正向输入采用的PB0，可通过PA9输出的4KHZ，75%占空比方波接入，波形由TIM1的CH2产生
比较器输出用的PE6引脚。

消隐源是通过TIM1的CH5产生，输出4KHz，占空比2000/50000。

消隐后的输出效果如下：



禁止TIM5 CH5消隐源的输出后，效果也没问题，跟上面截图一样，看来是波形效果够好。

eric2013

补上配置代码，方便以后查阅：

1. /* Private typedef -----------------------------------------------------------*/
   
2. /* Private define ------------------------------------------------------------*/
   
3. /* Private macro -------------------------------------------------------------*/
   
4. /* Private variables ---------------------------------------------------------*/
   
5. COMP_HandleTypeDef   CompxHandle;
   
6. TIM_HandleTypeDef    PWM_Handle;
   
7. 
   
8. __IO uint32_t State = 0;
   
9. 
   
10. /* Private function prototypes -----------------------------------------------*/
    
11. static void SystemClock_Config(void);
    
12. static void COMPx_Config(void);
    
13. static void TIM1_Config(void);
    
14. static void Error_Handler(void);
    
15. static void CPU_CACHE_Enable(void);
    
16. /* Private functions ---------------------------------------------------------*/
    
17. 
    
18. /**
    
19.   * @brief  Main program.
    
20.   * @param  None
    
21.   * @retval None
    
22.   */
    
23. int main(void)
    
24. {
    
25.   
    
26.   /* Enable the CPU Cache */
    
27.   CPU_CACHE_Enable();
    
28.   /* STM32H7xx HAL library initialization:
    
29.        - Systick timer is configured by default as source of time base, but user
    
30.          can eventually implement his proper time base source (a general purpose
    
31.          timer for example or other time source), keeping in mind that Time base
    
32.          duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
    
33.          handled in milliseconds basis.
    
34.        - Set NVIC Group Priority to 4
    
35.        - Low Level Initialization
    
36.      */
    
37.   HAL_Init();
    
38. 
    
39.   /* Configure the system clock to 400 MHz */
    
40.   SystemClock_Config();
    
41. 
    
42.   /* Initialize LED3  */
    
43. 
    
44.   BSP_LED_Init(LED3);
    
45. 
    
46.   /* configure COMPx : output redirected to TIM1 BKIN and blanking source is TIM1 OC5 */
    
47.   COMPx_Config();
    
48. 
    
49.   /* TIM1 Configuration in PWM mode */
    
50.   TIM1_Config();
    
51.   
    
52.   /* Infinite loop */
    
53.   while (1)
    
54.   {
    
55.   }
    
56. }
    
57. 
    
58. /**
    
59.   * @brief  Configure COMPx
    
60.   * @param  None
    
61.   * @retval None
    
62.   */
    
63. static void COMPx_Config(void)
    
64. {
    
65. 
    
66.   /*##-1- Configure the COMPx peripheral ###################################*/
    
67.   /* COMPx init: COMPx Output is connected to GPIO only (not redirected     */
    
68.   /* to timers) and output blanking source is connected to                  */
    
69.   /* TIM1 OC5.                                              */
    
70.   CompxHandle.Instance = COMPx;
    
71. 
    
72.   CompxHandle.Init.InvertingInput    = COMP_INPUT_MINUS_VREFINT;
    
73.   CompxHandle.Init.NonInvertingInput = COMP_INPUT_PLUS_IO1;
    
74. 
    
75.   CompxHandle.Init.BlankingSrce      = COMP_BLANKINGSRC_TIM1_OC5;
    
76.   CompxHandle.Init.OutputPol         = COMP_OUTPUTPOL_NONINVERTED;
    
77. 
    
78.   CompxHandle.Init.Mode              = COMP_POWERMODE_HIGHSPEED;
    
79.   CompxHandle.Init.Hysteresis        = COMP_HYSTERESIS_NONE;
    
80.   CompxHandle.Init.WindowMode        = COMP_WINDOWMODE_DISABLE;
    
81.   CompxHandle.Init.TriggerMode       = COMP_TRIGGERMODE_NONE;
    
82.   HAL_COMP_Init(&CompxHandle);
    
83. 
    
84.   /*##-2- Start the comparator process #####################################*/
    
85.   /* Enable COMPx: the higher threshold is set to VREFINT ~ 1.22 V */
    
86.   HAL_COMP_Start(&CompxHandle);
    
87. }
    
88. 
    
89. /**            
    
90.   * @brief  TIM1 Configuration 2 and channel 5 in PWM mode
    
91.   * @note   TIM1 configuration is based on APB1 frequency
    
92.   * @note   TIM1 Update event occurs each SystemCoreClock/FREQ   
    
93.   * @param  None
    
94.   * @retval None
    
95.   */
    
96. void TIM1_Config(void)
    
97. {
    
98.   TIM_OC_InitTypeDef    TIMPWM_Config;
    
99.   
    
100.   /*##-1- Configure the TIM peripheral #######################################*/
     
101.   /* Configure TIM1 */
     
102.   /* PWM configuration */
     
103.   PWM_Handle.Instance = TIM1;
     
104.   
     
105.   /* Time Base configuration */
     
106.       
     
107.   PWM_Handle.Init.Period = 49999;         
     
108.   PWM_Handle.Init.Prescaler = 0;      
     
109.   PWM_Handle.Init.ClockDivision = 0;   
     
110.   PWM_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
     
111.   PWM_Handle.Init.RepetitionCounter = 0;
     
112.   HAL_TIM_PWM_Init(&PWM_Handle);
     
113.   
     
114.   /*##-2- Configure the PWM Output Capture ########################################*/  
     
115.   /* PWM Output Capture configuration of TIM1 channel 2 */
     
116.   /* Duty cycle is pulse/period = 100 * (37500 / 50000) =  75% */
     
117.   TIMPWM_Config.OCMode  = TIM_OCMODE_PWM1;
     
118.   TIMPWM_Config.OCIdleState = TIM_OCIDLESTATE_RESET;
     
119.   TIMPWM_Config.OCNIdleState = TIM_OCNIDLESTATE_RESET;
     
120.   TIMPWM_Config.Pulse = 37500;
     
121.   TIMPWM_Config.OCPolarity = TIM_OCPOLARITY_HIGH;
     
122.   TIMPWM_Config.OCNPolarity = TIM_OCNPOLARITY_LOW;
     
123.   TIMPWM_Config.OCFastMode = TIM_OCFAST_DISABLE;
     
124.   if(HAL_TIM_PWM_ConfigChannel(&PWM_Handle, &TIMPWM_Config, TIM_CHANNEL_2) != HAL_OK)
     
125.   {
     
126.     /* Initialization Error */
     
127.     Error_Handler();
     
128.   }
     
129.   
     
130.   /*##-2- Configure the PWM Output Capture ########################################*/  
     
131.   /* PWM Output Capture configuration of TIM1 channel 5 */
     
132.   /* Channel 5 is an internal channel (not available on GPIO): */
     
133. 
     
134.   TIMPWM_Config.OCMode  = TIM_OCMODE_PWM1;
     
135.   TIMPWM_Config.OCIdleState = TIM_OCIDLESTATE_RESET;
     
136.   TIMPWM_Config.OCNIdleState = TIM_OCNIDLESTATE_RESET;
     
137.   TIMPWM_Config.Pulse = 2000;
     
138.   TIMPWM_Config.OCPolarity = TIM_OCPOLARITY_HIGH;
     
139.   TIMPWM_Config.OCNPolarity = TIM_OCNPOLARITY_LOW;
     
140.   TIMPWM_Config.OCFastMode = TIM_OCFAST_DISABLE;
     
141.   if(HAL_TIM_PWM_ConfigChannel(&PWM_Handle, &TIMPWM_Config, TIM_CHANNEL_5) != HAL_OK)
     
142.   {
     
143.     /* Initialization Error */
     
144.     Error_Handler();
     
145.   }
     
146.   
     
147.   /*##-3- Enable TIM peripheral counter ######################################*/
     
148.   /* Start the TIM1 Channel 2 PWM */
     
149.   if(HAL_TIM_PWM_Start(&PWM_Handle, TIM_CHANNEL_2) != HAL_OK)
     
150.   {
     
151.     Error_Handler();
     
152.   }
     
153.   
     
154.   /* Start the TIM1 Channel 5 PWM */
     
155.   if(HAL_TIM_PWM_Start(&PWM_Handle, TIM_CHANNEL_5) != HAL_OK)
     
156.   {
     
157.    Error_Handler();
     
158.   }
     
159. }

复制代码

hpdell

高大上啊，