stm32f103 tim1触发adc1

### STM32F103 TIM1 Trigger ADC1 Conversion Example Code and Configuration

For the STM32F103 microcontroller, configuring the TIM1 timer to trigger an ADC1 conversion involves several steps including setting up both peripherals correctly within a project using HAL libraries or standard peripheral library functions.

#### Timer (TIM1) Setup
The first part of this setup is initializing TIM1 as follows:

// Initialize TIM1 for generating triggers.
void MX_TIM1_Init(void)
{
    TIM_MasterConfigTypeDef sMasterConfig;
    TIM_OC_InitTypeDef sConfigOC;

    htim1.Instance = TIM1;
    htim1.Init.Prescaler = 83; // Adjust based on system clock speed
    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim1.Init.Period = 999;   // Period value depends on desired frequency
    htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim1.Init.RepetitionCounter = 0;
    if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
    {
        Error_Handler();
    }

    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
    {
        Error_Handler();
    }
}

This code initializes TIM1 with specific parameters that define how often it generates events which can be used by other peripherals like ADC[^1].

#### ADC (ADC1) Initialization
Next comes preparing ADC1 so it listens for these triggers from TIM1:

static void MX_ADC1_Init(void)
{
    ADC_ChannelConfTypeDef sConfig = {0};

    hadc1.Instance = ADC1;
    hadc1.Init.ScanConvMode = DISABLE;
    hadc1.Init.ContinuousConvMode = ENABLE;
    hadc1.Init.DiscontinuousConvMode = DISABLE;
    hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
    hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
    hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc1.Init.NbrOfConversion = 1;
    if (HAL_ADC_Init(&hadc1) != HAL_OK)
    {
        Error_Handler();
    }

    sConfig.Channel = ADC_CHANNEL_0;
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
    if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
    {
        Error_Handler();
    }
}

Here, `ExternalTrigConv` specifies what external signal should start conversions—in this case, channel 1 compare event (`CC1`) from TIM1. This means every time there's a match between counter value and CC1 register content during upward counting phase, one conversion cycle starts immediately after previous has finished when continuous mode enabled[^2].

#### Starting Conversions
Finally, starting everything requires enabling timers and initiating ADC operations programmatically once configurations are done:

int main(void)
{
    /* ... Other initializations omitted */

    MX_ADC1_Init();     // Initialize ADC1
    MX_TIM1_Init();      // Initialize TIM1
    
    HAL_TIM_Base_Start_IT(&htim1); // Start TIM1 in interrupt mode
    HAL_ADC_Start_DMA(&hadc1, (uint32_t*)aADCxConvertedValues, BUFFER_SIZE);

    while(1){
       // Main loop tasks here...
    }
}

In summary, combining proper initialization routines ensures seamless interaction where each rising edge generated internally inside TIM1 prompts corresponding actions at ADC side leading into efficient data acquisition cycles without CPU intervention required beyond startup sequence[^3].