STM32cubeIDE-LL库-F4xx使用DMA获取ADC多通道转换值
STM32cubeIDE-LL库-F4xx使用DMA获取ADC多通道转换值
-
- ADC通道配置与DMA配置
- 代码添加
- 源文件
ADC通道配置与DMA配置
1.通道选择
2.配置ADC
这里需要注意：Rank需要一 一点开设置ADC通道
比如这样设置好编号与通道号
3.配置DMA
点击到>DMA Setings ,Add一下就好，Data Width 选择Half Word（半字就好），ADC只有12位，半字为16位。
这个配置就已经完了，保存一下生成代码。
代码添加
完成上述步骤会得到这样一个函数
/* ADC1 init function */
void MX_ADC1_Init(void)
{
LL_ADC_InitTypeDef ADC_InitStruct = {0};
LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = {0};
LL_ADC_CommonInitTypeDef ADC_CommonInitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* Peripheral clock enable */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
/**ADC1 GPIO Configuration
PA1 ------> ADC1_IN1
PA2 ------> ADC1_IN2
PA3 ------> ADC1_IN3
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_1|LL_GPIO_PIN_2|LL_GPIO_PIN_3;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* ADC1 DMA Init */
/* ADC1 Init */
LL_DMA_SetChannelSelection(DMA2, LL_DMA_STREAM_0, LL_DMA_CHANNEL_0);
LL_DMA_SetDataTransferDirection(DMA2, LL_DMA_STREAM_0, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
LL_DMA_SetStreamPriorityLevel(DMA2, LL_DMA_STREAM_0, LL_DMA_PRIORITY_HIGH);
LL_DMA_SetMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MODE_CIRCULAR);
LL_DMA_SetPeriphIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_PERIPH_NOINCREMENT);
LL_DMA_SetMemoryIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MEMORY_INCREMENT);
LL_DMA_SetPeriphSize(DMA2, LL_DMA_STREAM_0, LL_DMA_PDATAALIGN_HALFWORD);
LL_DMA_SetMemorySize(DMA2, LL_DMA_STREAM_0, LL_DMA_MDATAALIGN_HALFWORD);
LL_DMA_DisableFifoMode(DMA2, LL_DMA_STREAM_0);
/** Common config
*/
ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;
ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;
ADC_InitStruct.SequencersScanMode = LL_ADC_SEQ_SCAN_ENABLE;
LL_ADC_Init(ADC1, &ADC_InitStruct);
ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;
ADC_REG_InitStruct.SequencerLength = LL_ADC_REG_SEQ_SCAN_ENABLE_3RANKS;
ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;
ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_SINGLE;
ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_UNLIMITED;
LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);
LL_ADC_REG_SetFlagEndOfConversion(ADC1, LL_ADC_REG_FLAG_EOC_SEQUENCE_CONV);
ADC_CommonInitStruct.CommonClock = LL_ADC_CLOCK_SYNC_PCLK_DIV4;
ADC_CommonInitStruct.Multimode = LL_ADC_MULTI_INDEPENDENT;
LL_ADC_CommonInit(__LL_ADC_COMMON_INSTANCE(ADC1), &ADC_CommonInitStruct);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_1);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SAMPLINGTIME_3CYCLES);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_2, LL_ADC_CHANNEL_2);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SAMPLINGTIME_3CYCLES);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_3, LL_ADC_CHANNEL_3);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SAMPLINGTIME_3CYCLES);
}
2.添加启动代码
自己建立一个功能函数，在里面配置：DAM数据长度，外设地址，内存地址，使能中断，开启ADC转换
void ADC1_Start_DMA(void)
{
LL_DMA_SetDataLength(DMA2,LL_DMA_STREAM_0,3);
LL_DMA_SetPeriphAddress(DMA2,LL_DMA_STREAM_0,LL_ADC_DMA_GetRegAddr(ADC1,LL_ADC_DMA_REG_REGULAR_DATA));
LL_DMA_SetMemoryAddress(DMA2,LL_DMA_STREAM_0,(uint32_t)ADC_ConvertedValue);
LL_DMA_EnableStream(DMA2,LL_DMA_STREAM_0);
LL_DMA_ClearFlag_TC0(DMA2);
LL_DMA_EnableIT_TC(DMA2, LL_DMA_STREAM_0);
LL_ADC_Enable(ADC1);
LL_ADC_REG_StartConversionSWStart(ADC1);
LL_ADC_REG_SetDMATransfer(ADC1,LL_ADC_REG_DMA_TRANSFER_UNLIMITED);
}
3.设置中断服务函数
/**
* @brief This function handles DMA2 stream0 global interrupt.
*/
void DMA2_Stream0_IRQHandler(void)
{
/* USER CODE BEGIN DMA2_Stream0_IRQn 0 */
if(LL_DMA_IsActiveFlag_TC0(DMA2))
{
ADC_TC_Flag = 1;
}
/* USER CODE END DMA2_Stream0_IRQn 0 */
/* USER CODE BEGIN DMA2_Stream0_IRQn 1 */
LL_DMA_ClearFlag_TC0(DMA2);
/* USER CODE END DMA2_Stream0_IRQn 1 */
}
4.主函数
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
/* System interrupt init*/
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
/* USER CODE BEGIN 2 */
ADC1_Start_DMA();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if(ADC_TC_Flag == 1)
{
//在这里决定ADC的转换值怎么用
//这样这样
//那样那样
ADC_TC_Flag = 0;
}
}
/* USER CODE END 3 */
}
源文件
我这里提供一下这个源文件。
这是–adc.c
/* Includes ------------------------------------------------------------------*/
#include "adc.h"
/* USER CODE BEGIN 0 */
uint16_t ADC_ConvertedValue[3] = {0};
uint8_t ADC_TC_Flag = 0;
/* USER CODE END 0 */
/* ADC1 init function */
void MX_ADC1_Init(void)
{
LL_ADC_InitTypeDef ADC_InitStruct = {0};
LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = {0};
LL_ADC_CommonInitTypeDef ADC_CommonInitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* Peripheral clock enable */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
/**ADC1 GPIO Configuration
PA1 ------> ADC1_IN1
PA2 ------> ADC1_IN2
PA3 ------> ADC1_IN3
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_1|LL_GPIO_PIN_2|LL_GPIO_PIN_3;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* ADC1 DMA Init */
/* ADC1 Init */
LL_DMA_SetChannelSelection(DMA2, LL_DMA_STREAM_0, LL_DMA_CHANNEL_0);
LL_DMA_SetDataTransferDirection(DMA2, LL_DMA_STREAM_0, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
LL_DMA_SetStreamPriorityLevel(DMA2, LL_DMA_STREAM_0, LL_DMA_PRIORITY_HIGH);
LL_DMA_SetMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MODE_CIRCULAR);
LL_DMA_SetPeriphIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_PERIPH_NOINCREMENT);
LL_DMA_SetMemoryIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MEMORY_INCREMENT);
LL_DMA_SetPeriphSize(DMA2, LL_DMA_STREAM_0, LL_DMA_PDATAALIGN_HALFWORD);
LL_DMA_SetMemorySize(DMA2, LL_DMA_STREAM_0, LL_DMA_MDATAALIGN_HALFWORD);
LL_DMA_DisableFifoMode(DMA2, LL_DMA_STREAM_0);
/** Common config
*/
ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;
ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;
ADC_InitStruct.SequencersScanMode = LL_ADC_SEQ_SCAN_ENABLE;
LL_ADC_Init(ADC1, &ADC_InitStruct);
ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;
ADC_REG_InitStruct.SequencerLength = LL_ADC_REG_SEQ_SCAN_ENABLE_3RANKS;
ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;
ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_SINGLE;
ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_UNLIMITED;
LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);
LL_ADC_REG_SetFlagEndOfConversion(ADC1, LL_ADC_REG_FLAG_EOC_SEQUENCE_CONV);
ADC_CommonInitStruct.CommonClock = LL_ADC_CLOCK_SYNC_PCLK_DIV4;
ADC_CommonInitStruct.Multimode = LL_ADC_MULTI_INDEPENDENT;
LL_ADC_CommonInit(__LL_ADC_COMMON_INSTANCE(ADC1), &ADC_CommonInitStruct);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_1);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SAMPLINGTIME_3CYCLES);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_2, LL_ADC_CHANNEL_2);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SAMPLINGTIME_3CYCLES);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_3, LL_ADC_CHANNEL_3);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SAMPLINGTIME_3CYCLES);
}
/* USER CODE BEGIN 1 */
void ADC1_Start_DMA(void)
{
LL_DMA_SetDataLength(DMA2,LL_DMA_STREAM_0,3);
LL_DMA_SetPeriphAddress(DMA2,LL_DMA_STREAM_0,LL_ADC_DMA_GetRegAddr(ADC1,LL_ADC_DMA_REG_REGULAR_DATA));
LL_DMA_SetMemoryAddress(DMA2,LL_DMA_STREAM_0,(uint32_t)ADC_ConvertedValue);
LL_DMA_EnableStream(DMA2,LL_DMA_STREAM_0);
LL_DMA_ClearFlag_TC0(DMA2);
LL_DMA_EnableIT_TC(DMA2, LL_DMA_STREAM_0);
LL_ADC_Enable(ADC1);
LL_ADC_REG_StartConversionSWStart(ADC1);
LL_ADC_REG_SetDMATransfer(ADC1,LL_ADC_REG_DMA_TRANSFER_UNLIMITED);
}
/* USER CODE END 1 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
这里是–adc.h
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __adc_H
#define __adc_H
#ifdef __cplusplus
extern "C" {
#endif
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* USER CODE BEGIN Private defines */
extern uint16_t ADC_ConvertedValue[3];
extern uint8_t ADC_TC_Flag;
/* USER CODE END Private defines */
void MX_ADC1_Init(void);
/* USER CODE BEGIN Prototypes */
void ADC1_Start_DMA(void);
/* USER CODE END Prototypes */
#ifdef __cplusplus
}
#endif
#endif /*__ adc_H */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/