stm32f407定时器触发adc采样HAL库代码
时间: 2023-08-30 07:05:15 浏览: 234
下面是使用HAL库编写的在STM32F407上使用定时器触发ADC采样的示例代码。
首先需要配置ADC和定时器的初始化参数。
```c
ADC_HandleTypeDef hadc1;
TIM_HandleTypeDef htim2;
void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
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_RISING;
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_TRGO;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
void MX_TIM2_Init(void)
{
TIM_MasterConfigTypeDef sMasterConfig;
htim2.Instance = TIM2;
htim2.Init.Prescaler = 8399;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 1999;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
```
在主函数中,开启定时器和ADC:
```c
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_TIM2_Init();
MX_ADC1_Init();
HAL_TIM_Base_Start(&htim2);
HAL_ADC_Start(&hadc1);
while (1)
{
if (HAL_ADC_PollForConversion(&hadc1, 1000) == HAL_OK)
{
uint32_t adc_value = HAL_ADC_GetValue(&hadc1);
printf("ADC value: %ld\n", adc_value);
}
}
}
```
在这个示例中,定时器的时钟频率为84MHz / (8399 + 1) = 10 kHz,定时器的周期为(1999 + 1) / 10 kHz = 200ms,ADC的采样时间为3个时钟周期,因此每200ms会触发一次ADC采样。
需要注意的是,这个示例中使用了轮询模式进行ADC采样,也可以使用DMA模式进行采样以提高效率。
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