Hallo Zusammen,
ich möchte gerne ein Software PWM Signal mit einem STM32F303
(ST-Nucleo-32) Board generieren.
Ich verwende CubeMX und deren HAL_Library.
Das gewünschte PWM habe ich damit auch generieren können, allerdings mit
einem Problem. Das PWM Signal "flackert":
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1 | int main(void)
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2 | {
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3 | HAL_Init();
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4 | SystemClock_Config();
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5 | MX_GPIO_Init();
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6 | MX_TIM2_Init();
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7 |
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8 | HAL_TIM_OC_Start_IT(&htim2,TIM_CHANNEL_1);
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9 | __HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_1, 0x100);
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10 |
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11 | }
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1 | void SystemClock_Config(void)
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2 | {
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3 |
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4 | RCC_OscInitTypeDef RCC_OscInitStruct;
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5 | RCC_ClkInitTypeDef RCC_ClkInitStruct;
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6 |
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7 | /**Initializes the CPU, AHB and APB busses clocks
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8 | */
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9 |
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10 | RCC_OscInitStruct.HSEState = RCC_HSE_ON;
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11 | RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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12 | RCC_OscInitStruct.HSIState = RCC_HSI_ON;
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13 | RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
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14 | RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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15 | RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
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16 | RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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17 |
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18 | if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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19 | {
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20 | _Error_Handler(__FILE__, __LINE__);
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21 | }
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22 |
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23 | /**Initializes the CPU, AHB and APB busses clocks
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24 | */
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25 | RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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26 | RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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27 | RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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28 | RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
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29 | RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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30 |
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31 | if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
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32 | {
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33 | _Error_Handler(__FILE__, __LINE__);
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34 | }
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35 |
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36 | /**Configure the Systick interrupt time
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37 | */
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38 | HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
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39 |
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40 | /**Configure the Systick
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41 | */
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42 | HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
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43 |
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44 | /* SysTick_IRQn interrupt configuration */
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45 | HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
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46 | }
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1 | static void MX_TIM2_Init(void)
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2 | {
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3 |
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4 | TIM_ClockConfigTypeDef sClockSourceConfig;
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5 | TIM_MasterConfigTypeDef sMasterConfig;
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6 |
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7 | htim2.Instance = TIM2;
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8 | htim2.Init.Prescaler = 8;
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9 | htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
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10 | htim2.Init.Period = 0xFFFE;
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11 | htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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12 | htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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13 | if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
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14 | {
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15 | _Error_Handler(__FILE__, __LINE__);
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16 | }
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17 |
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18 | sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
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19 | if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
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20 | {
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21 | _Error_Handler(__FILE__, __LINE__);
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22 | }
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23 |
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24 | sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;
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25 | sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
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26 | if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
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27 | {
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28 | _Error_Handler(__FILE__, __LINE__);
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29 | }
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30 |
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31 | }
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1 | void TIM2_IRQHandler(void)
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2 | {
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3 |
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4 | switch(c){
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5 |
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6 | case 1: //+0xBB8
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7 |
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8 |
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9 |
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10 |
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11 | CNT_Current= __HAL_TIM_GET_COUNTER(&htim2);
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12 | __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, CNT_Current+0xBB8);
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13 | GPIOB -> ODR |= GPIO_PIN_3;
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14 |
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15 | c=3;
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16 |
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17 | break;
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18 |
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19 |
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20 | case 2:
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21 | //kommt später...
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22 | break;
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23 |
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24 |
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25 | case 3: //+0x1F4
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26 |
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27 | CNT_Current=__HAL_TIM_GET_COUNTER(&htim2);
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28 | __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, CNT_Current+ 0x1F4);
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29 | GPIOB -> ODR &= ~GPIO_PIN_3;
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30 | c = 1;
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31 |
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32 | break;
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33 |
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34 | }
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35 |
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36 |
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37 | HAL_TIM_IRQHandler(&htim2);
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38 |
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39 | }
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Ich wäre für eine Lösung bzw. Erklärung sehr dankbar!
