stm32tim触发adc采样,要具体代码
时间: 2023-03-15 09:22:15 浏览: 66
首先,你需要确保stm32tim的时基是正确的。然后,你需要使用ADC_Channel_Config函数来配置ADC通道,并使用ADC_SoftwareStartConversion函数来启动ADC采样。最后,你可以使用ADC_GetConversionValue函数来读取ADC采样结果。
相关问题
stm32tim触发adcdma采样
你可以使用STM32的定时器(TIM)和DMA来触发ADC的转换和数据传输。下面是一个简单的示例代码,演示了如何使用TIM触发ADC和DMA进行采样:
```c
#include "stm32f4xx.h"
#define ADC_BUFFER_SIZE 100
uint16_t adc_buffer[ADC_BUFFER_SIZE];
void TIM_Configuration(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000; // 定时器周期为1000(在72MHz下,定时器时钟为72MHz/1000 = 72kHz)
TIM_TimeBaseStructure.TIM_Prescaler = 71; // 预分频器为71(定时器时钟为72kHz/72 = 1kHz)
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); // 选择更新事件作为触发信号
TIM_Cmd(TIM2, ENABLE);
}
void ADC_DMA_Configuration(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
DMA_InitTypeDef DMA_InitStructure;
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&adc_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = ADC_BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; // 连续转换模式
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; // 使用TIM2的触发信号
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles); // 配置ADC通道0
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_SoftwareStartConv(ADC1);
}
int main(void)
{
TIM_Configuration();
ADC_DMA_Configuration();
while (1)
{
// 程序主循环
}
}
```
上述代码中,我们使用TIM2定时器的更新事件作为ADC的触发信号,并使用DMA2的Stream 0将ADC转换结果传输到adc_buffer数组中。请根据你的需求进行修改和适配。注意,此示例代码基于STM32F4系列微控制器,并使用了相应的库函数。如果你使用的是其他型号的STM32微控制器,请根据其参考手册和库函数进行相应的修改和调整。
stm32定时器触发adc采样代码
以下是使用STM32定时器触发ADC采样的示例代码:
```
#include "stm32f4xx.h"
#define ADC3_DR_ADDRESS ((uint32_t)0x4001224C)
void ADC3_Config(void);
void TIM2_Config(void);
void GPIO_Config(void);
int main(void)
{
GPIO_Config();
ADC3_Config();
TIM2_Config();
while (1)
{
// 采样完成后,ADC3_DR寄存器中存储采样值
uint16_t adc_value = *(uint16_t*)ADC3_DR_ADDRESS;
}
}
void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
// 使能GPIOC时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
// 配置PC0为模拟输入
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStruct);
}
void ADC3_Config(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStruct;
ADC_InitTypeDef ADC_InitStruct;
// 使能ADC3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
// ADC3通用配置
ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStruct);
// ADC3单独配置
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ScanConvMode = DISABLE;
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_NbrOfConversion = 1;
ADC_Init(ADC3, &ADC_InitStruct);
// 配置ADC3通道10为采样通道
ADC_RegularChannelConfig(ADC3, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);
// 使能ADC3
ADC_Cmd(ADC3, ENABLE);
// 等待ADC3启动
while (!ADC_GetFlagStatus(ADC3, ADC_FLAG_ADONS));
}
void TIM2_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_InitStruct;
// 使能TIM2和GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// TIM2配置
TIM_InitStruct.TIM_Prescaler = 84 - 1; // 定时器时钟频率为84MHz/84=1MHz
TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitStruct.TIM_Period = 1000 - 1; // 计数器计数到1000时触发ADC采样
TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2, &TIM_InitStruct);
// 启用TIM2触发ADC3采样
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
ADC_ExternalTrigConvCmd(ADC3, ENABLE);
// 启动TIM2
TIM_Cmd(TIM2, ENABLE);
}
```
此代码初始化了ADC3、TIM2和GPIOC,将PC0配置为模拟输入,并使用TIM2触发ADC3采样。计时器时钟频率为1MHz,计数器计数到1000时触发一次ADC采样。采样完成后,采样值存储在ADC3_DR寄存器中。