stm32多通道adc采集电压代码实例
时间: 2024-06-02 18:04:13 浏览: 17
好的,以下是一个简单的STM32多通道ADC采集电压的代码实例。
首先,需要定义ADC的初始化结构体,包括通道数、采样时间等参数:
```
ADC_HandleTypeDef hadc;
ADC_ChannelConfTypeDef sConfig;
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.ScanConvMode = ENABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.NbrOfConversion = 3; // 采集3个通道
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
Error_Handler();
}
// 配置每个通道的采样时间和分辨率
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_56CYCLES;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = 2;
sConfig.SamplingTime = ADC_SAMPLETIME_56CYCLES;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = 3;
sConfig.SamplingTime = ADC_SAMPLETIME_56CYCLES;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
```
然后,开启ADC转换并获取采样值:
```
// 开始ADC转换
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
Error_Handler();
}
// 等待转换完成
if (HAL_ADC_PollForConversion(&hadc, 100) != HAL_OK)
{
Error_Handler();
}
// 获取采样值
uint16_t adcValue;
adcValue = HAL_ADC_GetValue(&hadc);
adcValue = HAL_ADC_GetValue(&hadc);
adcValue = HAL_ADC_GetValue(&hadc);
```
以上代码实现了ADC的初始化、配置和数据采集功能。需要注意的是,在使用多通道采集时,每次获取采样值需要调用`HAL_ADC_GetValue()`函数多次。