stm32adc快速交叉模式
时间: 2023-06-15 16:07:10 浏览: 125
STM的ADC模块有两种转换模式:单次转换模式和扫描转换模式。而交叉模式是一种特殊的扫描转换模式,它可以在两个或多个ADC通道之间进行快速交替转换,从而提高转换速度和精度。
在使用交叉模式时,需要将ADC的扫描模式设置为交叉模式,并设置交叉模式下要转换的通道。例如,如果要在PA0和PA1两个通道之间进行快速交替转换,可以按照以下步骤进行设置:
1. 将ADC的扫描模式设置为交叉模式: `ADC1->CR1 |= ADC_CR1_SCAN;`
2. 设置要转换的通道: `ADC1->CR1 |= ADC_CR1_DISCEN;` `ADC1->CR1 |= ADC_CR1_DISCEN;` `ADC1->CR1 |= ADC_CR1_DISCEN;`
3. 设置交叉模式下的转换顺序: `ADC1->CR1 |= ADC_CR1_CONT;` `ADC1->CR2 |= ADC_CR2_EOCS;` `ADC1->SQR1 = (1 << 20) | (1 << 15);` `ADC1->SQR3 = (1 << 0) | (1 << 5);`
4. 启动ADC转换: `ADC1->CR2 |= ADC_CR2_ADON;`
在交叉模式下,ADC会按照设置的通道顺序进行快速交替转换,每个通道的转换时间非常短,可以达到几十纳秒的级别。因此,交叉模式可以在需要高速转换多个通道时使用,例如音频信号采集等场景。
相关问题
STM32ADC双重ADC快速交叉模式采集一个通道数据,库函数
以下是使用STM32 HAL库函数采集一个通道数据的双重ADC快速交叉模式示例代码:
```c
#include "stm32f4xx_hal.h"
ADC_HandleTypeDef hadc1;
ADC_HandleTypeDef hadc2;
/* Configure ADCs and GPIOs */
void MX_ADC_Init(void)
{
ADC_MultiModeTypeDef multimode = {0};
ADC_ChannelConfTypeDef sConfig = {0};
/* Initialize ADC1 and ADC2 */
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.ExternalTrigConv = ADC_SOFTWARE_START;
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();
}
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.ScanConvMode = DISABLE;
hadc2.Init.ContinuousConvMode = ENABLE;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/* Configure ADC multi-mode */
multimode.Mode = ADC_DUALMODE_INTERL;
multimode.DMAAccessMode = ADC_DMAACCESSMODE_1;
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES;
if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
{
Error_Handler();
}
/* Configure ADC channel */
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
/* Start ADCs */
void MX_ADC_Start(void)
{
if (HAL_ADCEx_MultiModeStart_DMA(&hadc1, (uint32_t *)&ADC1ConvertedValue, 1) != HAL_OK)
{
Error_Handler();
}
if (HAL_ADC_Start_DMA(&hadc2, (uint32_t *)&ADC2ConvertedValue, 1) != HAL_OK)
{
Error_Handler();
}
}
/* ADCs conversion complete callback */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
/* ADC1 conversion complete */
if (hadc->Instance == ADC1)
{
/* Do something with ADC1ConvertedValue */
}
/* ADC2 conversion complete */
if (hadc->Instance == ADC2)
{
/* Do something with ADC2ConvertedValue */
}
}
int main(void)
{
/* Configure system clock */
SystemClock_Config();
/* Initialize ADCs and GPIOs */
MX_ADC_Init();
/* Start ADCs */
MX_ADC_Start();
/* Infinite loop */
while (1)
{
}
}
```
在上面的示例代码中,我们使用了双重ADC快速交叉模式,其中ADC1和ADC2都被配置为单通道模式,并采集同一个通道。我们还使用了DMA来传输ADC数据,并在ADC转换完成时调用HAL_ADC_ConvCpltCallback()回调函数。在该回调函数中,我们可以获取ADC1ConvertedValue和ADC2ConvertedValue,它们分别是ADC1和ADC2的转换结果。
STM32双重ADC快速交叉模式采集一个通道数据,库函数
在STM32的库函数中,使用双重ADC快速交叉模式采集一个通道数据的代码如下:
```c
#include "stm32f4xx.h"
#define ADC_CHANNEL ADC_Channel_0
#define ADC_SAMPLE_TIME ADC_SampleTime_15Cycles
void ADC_Config(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
/* Enable ADC1 and ADC2 clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE);
/* Configure common settings for both ADCs */
ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* Configure ADC1 */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* Configure ADC2 */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC2, &ADC_InitStructure);
/* Configure ADC channel */
ADC_RegularChannelConfig(ADC1, ADC_CHANNEL, 1, ADC_SAMPLE_TIME);
ADC_RegularChannelConfig(ADC2, ADC_CHANNEL, 1, ADC_SAMPLE_TIME);
/* Enable ADC1 and ADC2 */
ADC_Cmd(ADC1, ENABLE);
ADC_Cmd(ADC2, ENABLE);
/* Wait for ADCs to be ready */
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_RDY) || !ADC_GetFlagStatus(ADC2, ADC_FLAG_RDY));
/* Start ADCs */
ADC_StartConversion(ADC1);
ADC_StartConversion(ADC2);
}
uint16_t ADC_Read(void)
{
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)); // Wait for conversion to complete
return ADC_GetConversionValue(ADC1);
}
```
在上述代码中,首先需要配置双重ADC的通用设置,如模式、预分频、DMA访问模式等。然后分别配置ADC1和ADC2的分辨率、扫描转换模式、连续转换模式等参数。接着配置ADC channel,指定采集的通道和采样时间。最后使能ADC1和ADC2,等待ADCs准备好后启动转换,并在ADC_Read函数中获取ADC1的转换结果。值得注意的是,由于使用了双重ADC快速交叉模式,所以ADC2的转换结果可以忽略不计。
阅读全文