adc
adc。c
#include "adc.h"
#include "stm32f4xx.h"
#include "usart.h"
#define ADC1_DR_Address ((u32)0x4001204C)
vu16 ADC_ConvertedValue [1600];
//初始化DMA
//外设基地址Par
//内存基地址Mar
//传输数据大小Buff
void adc_DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);//使能DMA时钟
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 1600;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Word; 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);
}
void Adc_Init(void)
{ ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1通道时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //>84/4=21MHZ(F407ADC在2.4-3.6V供电电压下最大速率36M,稳定速度为30M);
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //失能DMA_MODE
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;// 设置是否打开扫描模式。这里我们设置单次转换所以不打开扫描模式，值为 DISABLE模数转换工作在单通道模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //模数转换工作在连续转换模式
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; //转换由软件而不是外部触发启动
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 0x1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channe6 configuration *************************************/
ADC_RegularChannelConfig(ADC1,ADC_Channel_6,1,ADC_SampleTime_3Cycles);// >84/4=21MHZ(F407ADC在2.4-3.6V供电电压下最大速率36M,稳定速度为30M)采样时间为 最大采样频率 为5个ADC时钟周期3加12.5加乘频率
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); //使能ADC1的 DMA
/* Enable ADC3 DMA */
ADC_DMACmd( ADC1, ENABLE);
/* Enable ADC3 */
ADC_Cmd(ADC1, ENABLE);
}
void TIM4_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 41; /*TIM_Period 设置了在下一个更新事件装入活动的自动重装载寄存器周期的值。它的取值必须在 0x0000 和0xFFFF 之间。 */
TIM_TimeBaseStructure.TIM_Prescaler =44; /*TIM_Prescaler设置了用来作为 TIMx 时钟频率除数的预分频值。它的取值必须在 0x0000 和0xFFFF 之间。 */
TIM_TimeBaseStructure.TIM_ClockDivision =0x0; /*TIM_ClockDivision 设置了时钟分割。*/
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; /*TIM_CounterMode 选择了计数器模式。TIM_CounterMode_Up: TIM 向上计数模式 */
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* Clear TIM2 update pending flag*/
TIM_ClearFlag(TIM4, TIM_FLAG_Update);
/* Enable TIM2 Update interrupt */
TIM_ITConfig(TIM4, TIM_IT_Update,ENABLE );
/* TIM2 disable counter */
TIM_Cmd(TIM4, DISABLE);
}
void TIM4_NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the USARTx Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void NVIC_Configuration(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//NVIC中断分组2:2位抢占优先级，2位响应优先级
}
dac。c
#define DAC_DHR12R1_DACC1DHR ((uint16_t)0x0FFF)
#include "stm32f4xx.h"
#include "usart.h"
#include "dac.h"
#include "stm32f4xx_dac.h"
vu16 DAC_VALUE[1600];
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void DAC_TIM_config()
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0x002c;
TIM_TimeBaseStructure.TIM_Prescaler=0x0029;
TIM_TimeBaseStructure.TIM_ClockDivision=0x0;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
TIM_Cmd(TIM2, ENABLE);
}
void DAC_config(void)
{
DAC_InitTypeDef DAC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DAC_InitStructure.DAC_Trigger=DAC_Trigger_T2_TRGO ;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bit0;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
}
void DAC_DMA_config()
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitStructure.DMA_Channel =DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_DACC1DHR;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)&DAC_VALUE;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = 1600;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
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(DMA1_Stream5, &DMA_InitStructure);
}
void Sin_DAC_Config(void)
{
GPIO_Configuration();
DAC_TIM_config();
DAC_config();
DAC_DMA_config();
}
//#endif
/**
* @}
*/
/**
* @}
*/
main
#include "stm32f4xx.h"
#include "usart.h"
#include "adc.h"
#include "dac.h"
extern uint16_t ADC_ConvertedValue[1600];
extern uint16_t DAC_VALUE[1600];
vu16 ADC_TimeOutFlag = 0;//TIM2_ADC中断标志位
void Delay(__IO uint32_t nCount)
{
while(nCount--)
{
}
}
int main(void)
{
float DA_value_1;
vu16 i;
Delay (0x1ffffff); //延时函数初始化
NVIC_Configuration();
TIM4_Configuration();
TIM4_NVIC_Configuration();
adc_DMA_Config();
Adc_Init() ; //选择ADC1通道6
Sin_DAC_Config();
TIM_Cmd(TIM6, ENABLE);
while(1)
{
if(ADC_TimeOutFlag==1)
{printf("\r\n****************************************************************\r\n");
ADC_TimeOutFlag=0;
ADC_SoftwareStartConv(ADC1);
for(i=0;i<1600;i++)
{
DAC_VALUE = ADC_ConvertedValue ;
DA_value_1 = DAC_DHR12R1_DACC1DHR;
printf(&quot;The current DA1 value = %4.5fV \r\n&quot;, DA_value_1);
Delay(0x1ffffff);
}
}
}
}
void TIM (void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) ==SET)//判断更新中断是否发生
{ TIM_ClearITPendingBit(TIM4 ,TIM_FLAG_Update);
//清楚更新中断标志
ADC_TimeOutFlag=1;
}
} |
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