解决The operation couldn’t be completed. (LaunchServicesError error 0.)

最新推荐文章于 2025-01-10 15:05:53 发布
最新推荐文章于 2025-01-10 15:05:53 发布
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The operation couldn’t be completed. (LaunchServicesError error 0.)这个问题常出现在跑模拟器的时候，变异项目是成功的，也能正常运行，但是就是无法跑在模拟器上：


重启模拟器和Xcode都没用，这让人很头疼，其实解决这个问题是很简单的：

1.选中模拟器

2.在菜单栏选择Simulator -> Reset Content and Settings...


这时候模拟器重置，等模拟器重置完成再运行项目就OK了

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### STM32F4 PB0 ADC Configuration and Usage For configuring the ADC on pin PB0 of an STM32F4 microcontroller, several steps are necessary to ensure proper operation. The configuration involves setting up GPIO pins as analog inputs, initializing the ADC peripheral, starting conversions, and handling interrupts if required. #### Configuring PB0 as Analog Input To use PB0 for ADC conversion, this pin must be configured as an analog input mode rather than a digital one: ```c GPIO_InitTypeDef GPIO_InitStruct; // Enable clock for GPIOB __HAL_RCC_GPIOB_CLK_ENABLE(); // Configure PB0 as analog input (ADC channel) GPIO_InitStruct.Pin = GPIO_PIN_0; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); ``` This setup ensures that PB0 operates correctly with the ADC by disabling any internal pull-up or pull-down resistors which could interfere with accurate voltage measurements[^1]. #### Initializing the ADC Peripheral The next step is initializing the ADC peripheral itself. This includes enabling its clock, configuring parameters such as resolution, data alignment, external trigger source/conversion start condition, continuous mode settings, etc., and finally activating it: ```c ADC_ChannelConfTypeDef sConfig = {0}; // Enable clock for ADC1 __HAL_RCC_ADC1_CLK_ENABLE(); hadc1.Instance = ADC1; hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; hadc1.Init.Resolution = ADC_RESOLUTION_12B; hadc1.Init.ScanConvMode = DISABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 1; if (HAL_ADC_Init(&hadc1) != HAL_OK){ // Initialization Error } sConfig.Channel = ADC_CHANNEL_8; // Channel corresponding to PB0 sConfig.Rank = 1; sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK){ // Channel Configuration Error } ``` In this code snippet, `ADC_CHANNEL_8` corresponds specifically to the connection between ADC1_IN8 and PB0 based on the STM32F4 series reference manual mapping table. Continuous conversion mode has been enabled here so that once started, multiple conversions will occur automatically without needing further software triggers unless explicitly stopped. #### Starting Conversions and Reading Data Once everything is set up properly, initiating conversions can happen through either polling methods where you wait until completion using blocking calls like `HAL_ADC_Start()` followed by reading results via `HAL_ADC_GetValue()`, or non-blocking approaches involving interrupt handlers when asynchronous behavior is desired: Interrupt-based approach example: ```c void StartADCCallback(void){ /* Ensure no pending flags */ __HAL_ADC_CLEAR_FLAG(&hadc1, ADC_FLAG_EOC); /* Start Conversion */ if(HAL_ADC_Start_IT(&hadc1)!= HAL_OK){ // Handle error } } /* Inside your Interrupt Handler Function */ void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){ uint32_t adc_value = HAL_ADC_GetValue(hadc); // Process converted value... } ``` Here, after ensuring there aren't already completed but unprocessed conversions (`__HAL_ADC_CLEAR_FLAG`), conversion starts within an interrupt context (`StartADCCallback`). Upon finishing each sample-and-hold cycle, hardware generates an end-of-conversion event triggering execution flow into `HAL_ADC_ConvCpltCallback`. Within this callback function, retrieving sampled values occurs safely from RAM buffers managed internally by the driver layer[^2]. --related questions-- 1. How does changing the sampling time affect ADC accuracy? 2. What considerations should be taken while selecting different ADC channels simultaneously? 3. Can DMA transfers improve performance during bulk acquisitions? If yes, how would they integrate with existing configurations shown above? 4. Are there specific power management guidelines associated with running ADC operations efficiently? 5. In what scenarios might calibration routines become essential before performing precise measurements?
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