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只能進(jìn)行一次DMA轉(zhuǎn)換，第二次采集不行？
源碼如下:
- #include "ADC.h"
- #include "usart.h"
- __IO uint16_t ADC_ConvertedValue[24];
- //************1.配置觸發(fā)所用定時(shí)器參數(shù)************************
- /*******************************************************************************
- * 函數(shù)名+函數(shù)功能: My_trigger_Time_Init: LED初始化函數(shù)
- * 輸入:usPer:自動(dòng)重裝載寄存器的值; usPsc:時(shí)鐘預(yù)分頻數(shù)
- 定時(shí)頻率=72M/(usPer+1)=72/36000=2kHz；中斷周期=usPsc*(1/定時(shí)頻率)=1000*(1/2kHz)=0.5s
- * 輸出: 無
- *******************************************************************************/
- void My_trigger_Time_Init(u16 usPer,u16 usPsc,u16 usPulse)
- {
- GPIO_InitTypeDef GPIO_InitTypeStruct;
- RCC_APB2PeriphClockCmd(trigger_Time_GPIO_CLK, ENABLE );
- GPIO_InitTypeStruct.GPIO_Pin = trigger_Time_GPIO_PIN; //定時(shí)器1觸發(fā)adc轉(zhuǎn)換的輸出的那個(gè)口
- GPIO_InitTypeStruct.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitTypeStruct.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(trigger_Time_GPIO_PORT, &GPIO_InitTypeStruct);
-
- TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
- TIM_OCInitTypeDef TIM_OCInitTypeStruct;
- //********************************1.初始化定時(shí)器參數(shù)********************************
- RCC_APB2PeriphClockCmd(trigger_Time_CLK,ENABLE);//本程序用的是TIME
- TIM_TimeBaseInitStructure.TIM_Period =usPer;
- TIM_TimeBaseInitStructure.TIM_Prescaler =usPsc;
- TIM_TimeBaseInitStructure.TIM_ClockDivision =TIM_CKD_DIV1;
- TIM_TimeBaseInitStructure.TIM_CounterMode =TIM_CounterMode_Up;//注意:必須配置成這個(gè)模式
- TIM_TimeBaseInit(trigger_Time,&TIM_TimeBaseInitStructure);
-
- TIM_OCInitTypeStruct.TIM_OCMode = TIM_OCMode_PWM1; //注意:必須配置成pwm模式 ，不能更改
- TIM_OCInitTypeStruct.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitTypeStruct.TIM_Pulse = usPulse;
- TIM_OCInitTypeStruct.TIM_OCPolarity = TIM_OCPolarity_Low;
- TIM_OC1Init(trigger_Time, &TIM_OCInitTypeStruct); //【改】：用不同的定時(shí)器觸發(fā)這個(gè)函數(shù)要改
- TIM_Cmd(trigger_Time,ENABLE);
- TIM_InternalClockConfig(trigger_Time);
- TIM_ARRPreloadConfig(trigger_Time, ENABLE);
- TIM_OC1PreloadConfig(trigger_Time,TIM_OCPreload_Enable);//【改】：用不同的定時(shí)器觸發(fā)這個(gè)函數(shù)要改
-
- TIM_CtrlPWMOutputs(trigger_Time, ENABLE); //這個(gè)是必須有的
-
- }
- //************2.配置觸發(fā)所用定時(shí)器參數(shù)************************
- /*******************************************************************************
- * 函數(shù)名+功能: My_ADC_Init:初始化函數(shù)
- * 輸入 : 無
- * 輸出 : 無
- *******************************************************************************/
- void My_DMA_Init(void)
- {
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(ADC_DMA_CLK, ENABLE);
- DMA_DeInit(ADC_DMA_Channel);
- DMA_InitStructure.DMA_PeripheralBaseAddr = ( uint32_t ) ( & ( ADC_x->DR ) );//ADC的數(shù)據(jù)寄存器的地址
- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC_ConvertedValue;//【改】：根據(jù)數(shù)據(jù)所放地址（16位）
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
- DMA_InitStructure.DMA_BufferSize = 24; //【改】：
- 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; //16位
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //傳送一次
- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(ADC_DMA_Channel, &DMA_InitStructure);
- DMA_Cmd(ADC_DMA_Channel , ENABLE);
- //*********************用中斷下面就需要，不用DMA中斷下面就不需要*************
- DMA_ITConfig(ADC_DMA_Channel,DMA_IT_TC,ENABLE);
- DMA_ClearFlag(DMA1_FLAG_TC1);
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel1_IRQn; //改
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0; //改
- NVIC_InitStructure.NVIC_IRQChannelSubPriority=0; //改
- NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- void My_ADC_Init( )
- {
- My_DMA_Init( );
- //*******************初始化ADC--GPIO引腳***********************************************
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd( ADC_GPIO_CLK, ENABLE );
- GPIO_InitStructure.GPIO_Pin =ADC_PIN;
- GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AIN; //這個(gè)必須為模擬輸入。
- GPIO_Init(ADC_PORT, &GPIO_InitStructure);
- //*******************配置ADC初始化***********************************************
- ADC_InitTypeDef ADC_InitStruct;
- RCC_ADCCLKConfig(RCC_PCLK2_Div6); //【改】：
- RCC_APB2PeriphClockCmd(ADC_CLK, ENABLE );
- ADC_DeInit(ADC_x);
-
- ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;
- ADC_InitStruct.ADC_ScanConvMode = DISABLE;
- ADC_InitStruct.ADC_ContinuousConvMode = DISABLE; //注意：不要使用連續(xù)轉(zhuǎn)換模式，否則只要出發(fā)一次，后續(xù)的轉(zhuǎn)換就不會(huì)停止，，這樣第一次以后的ADC，就不是有定時(shí)器觸發(fā)了。
- ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;//【改】：根據(jù)不同的定時(shí)器觸發(fā)腳
- ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
- ADC_InitStruct.ADC_NbrOfChannel = 1;
- ADC_Init(ADC_x, &ADC_InitStruct);
-
- ADC_RegularChannelConfig(ADC_x, ADC_CHANNEL, 1, ADC_SampleTime_1Cycles5);
- ADC_InjectedSequencerLengthConfig(ADC_x, 1);
-
- ADC_ExternalTrigInjectedConvConfig(ADC_x, ADC_ExternalTrigConv_T1_CC1 );//??????ADC_ExternalTrigInjecConv_None
-
- ADC_AutoInjectedConvCmd(ADC_x, ENABLE);
- ADC_ExternalTrigConvCmd(ADC_x,ENABLE); //ADC外部觸發(fā)使能
-
- ADC_DMACmd(ADC_x, ENABLE);//使能ADC DMA 請(qǐng)求這句不能少。
- ADC_Cmd(ADC_x, ENABLE); //是能ADC
-
- ADC_ResetCalibration(ADC_x);
- while(ADC_GetResetCalibrationStatus(ADC_x));
- ADC_StartCalibration(ADC_x);
- while(ADC_GetCalibrationStatus(ADC_x));
-
- }
- void DMA1_Channel1_IRQHandler(void)
- {
- int kl=0;
- if(DMA_GetITStatus(DMA1_IT_TC1)) //轉(zhuǎn)換完成
- {
- TIM_Cmd(TIM1, DISABLE);
- DMA_Cmd(DMA1_Channel1, DISABLE);
- for(kl=0;kl<24;kl++)
- {
- printf("\r\n The current AD value = %f V \r\n",(float) ADC_ConvertedValue[kl]/4096*3.3); //把電壓值用顯示
- printf("\r\n\r\n");
- }
- }
- DMA_ClearFlag(DMA1_FLAG_TC1);
- }
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