STM32F10XXX 雙通道ADC數(shù)據(jù)采集,TIM2觸發(fā)采集

*STM32F10XXX 雙通道ADC數(shù)據(jù)采集

*環(huán)境:keil for arm mdk 4.71a 官方V3.5庫

*STM32數(shù)據(jù)采集部分

* 1、ADC1/ADC2實(shí)現(xiàn)并行同時(shí)數(shù)據(jù)采集，12BIT最高可達(dá)1MSPS采樣速度并通過STM32的DMA傳輸放入內(nèi)存中

* 2、TIM2 CC2實(shí)現(xiàn)對ADC采樣的觸發(fā)，ADC_Sample_Frequency_Set函數(shù)實(shí)現(xiàn)自定義TIM2 CC2頻率輸出，

* 3、采樣的頻率和采樣個(gè)數(shù)通過接收到的UDP控制命令來指定

* 采樣的頻率為20HZ~1MHZ;

* 采樣深度為1~4000個(gè)數(shù)據(jù)(受限于STM32內(nèi)存20KB容量,一個(gè)數(shù)據(jù)為2個(gè)12bitADC通道讀數(shù),需一個(gè)word)

*******************************************************************************/

#define ADC1_DR_addr ((u32)0x4001244C) //AD轉(zhuǎn)換結(jié)果存放地址定義

/*******************************************************************************

* Function Name : DMA_ADC_Transfer_Reset

* Description : ADC1/ADC2 DMA傳輸通道復(fù)位，準(zhǔn)備下一次DMA傳輸

* Input : None

* Output : None

* Return : None

*******************************************************************************/

void DMA_ADC_Transfer_Reset(void)

{

//開始DMA傳輸

DMA_Channel1->CCR &= ~(1<<0); //禁用DMA_Channel,EN是CCR1寄存器的0位

DMA->IFCR |= 0x0000000F;//清除CHANNEL1的4個(gè)標(biāo)志

DMA_Channel1->CNDTR = (u16)SampleDepth;//重新設(shè)置要設(shè)置的DMA傳輸數(shù)據(jù)量

DMA_Channel1->CCR |= (1<<0);//重新使能DMA_channel1

while(!(DMA->ISR & DMA_FLAG_TC1));

DMA_Channel1->CCR &= ~(1<<0); //禁用DMA_Channel,EN是CCR1寄存器的0位

}

/*******************************************************************************

* Function Name : DMA_ADC_Transfer_Init

* Description : ADC1/ADC2 DMA傳輸通道初始化

* Input : None

* Output : None

* Return : None

*******************************************************************************/

void DMA_ADC_Transfer_Init(void)

{

DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

/* DMA channel1 configuration ----------------------------------------------*/

DMA_DeInit(DMA_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC_DR_Address;//ADC數(shù)據(jù)寄存器地址

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&Data_Buffer[0];//目標(biāo)緩沖區(qū)地址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//外設(shè)是源

DMA_InitStructure.DMA_BufferSize = 0;//設(shè)置DMA讀取長度為

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設(shè)地址不遞增

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//目標(biāo)緩沖區(qū)地址遞增

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//外設(shè)數(shù)據(jù)寬度

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;//目標(biāo)緩沖區(qū)數(shù)據(jù)寬度

DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA模式：Circular循環(huán)模式/Normal普通模式

DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//優(yōu)先級

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//內(nèi)存到內(nèi)存模式不使能

DMA_Init(DMA_Channel1, &DMA_InitStructure);

/* Enable DMA channel1 */

//DMA_Cmd(DMA_Channel1, ENABLE);

}

/*******************************************************************************

* Function Name : ADC_Initial

* Description : ADC1/ADC2初始化

*******************************************************************************/

void ADC_Initial(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB| RCC_APB2Periph_GPIOC |RCC_APB2Periph_ADC1, ENABLE ); //使能ADC通道時(shí)鐘

ADC_InitTypeDef ADC_InitStructure;

/* ADC1 configuration ------------------------------------------------------*/

ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;//ADC1/ADC2同時(shí)并行采樣模式

ADC_InitStructure.ADC_ScanConvMode = DISABLE;//多通道掃描模式

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//單次轉(zhuǎn)換模式(轉(zhuǎn)換后即停止)

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;//觸發(fā)模式

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//數(shù)據(jù)右對齊

ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC1 , &ADC_InitStructure);

/* ADC1 regular channel14 configuration */

ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_1Cycles5);

/* Enable ADC1 DMA */

ADC_DMACmd(ADC1, ENABLE);

/* ADC2 configuration ---配置同ADC1--------------------------------------------*/

ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;

ADC_InitStructure.ADC_ScanConvMode = DISABLE;

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC2, &ADC_InitStructure);

/* ADC2 regular channels configuration */

ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 1, ADC_SampleTime_1Cycles5);

/* Enable ADC2 external trigger conversion */

ADC_ExternalTrigConvCmd(ADC2, ENABLE);

/* Enable ADC1 */

ADC_Cmd(ADC1, ENABLE);

/* Enable ADC1 reset calibaration register 校準(zhǔn)ADC1*/

ADC_ResetCalibration(ADC1);

/* Check the end of ADC1 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC1));

/* Start ADC1 calibaration */

ADC_StartCalibration(ADC1);

/* Check the end of ADC1 calibration */

while(ADC_GetCalibrationStatus(ADC1));

/* Enable ADC2 */

ADC_Cmd(ADC2, ENABLE);

/* Enable ADC2 reset calibaration register 校準(zhǔn)ADC2*/

ADC_ResetCalibration(ADC2);

/* Check the end of ADC2 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC2));

/* Start ADC2 calibaration */

ADC_StartCalibration(ADC2);

/* Check the end of ADC2 calibration */

while(ADC_GetCalibrationStatus(ADC2));

/* Test on channel1 transfer complete flag */

//while(!DMA_GetFlagStatus(DMA_FLAG_TC1));

/* Clear channel1 transfer complete flag */

//DMA_ClearFlag(DMA_FLAG_TC1);

ADC_ExternalTrigConvCmd( ADC1, ENABLE);

}

/*******************************************************************************

* Function Name : ADC_Sample_Frequency_Set

* Description : 根據(jù)輸入的頻率設(shè)置，TIM2_CC2產(chǎn)生相應(yīng)的頻率

* 用來控制ADC的采樣，F(xiàn)requency=1000000/(Prescaler+1)來產(chǎn)生

* 因此有些頻率計(jì)算不準(zhǔn)確，一般頻率為2或5的倍數(shù)才準(zhǔn)確

* 頻率范圍為16Hz~1000,000Hz

* Input : u16 Frequency:輸入所需要的采樣頻率

*******************************************************************************/

void ADC_Sample_Frequency_Set(u32 Frequency)

{

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE );

TIM_Cmd(TIM2, DISABLE);//先停止TIM2時(shí)鐘，以準(zhǔn)備下面的設(shè)置

/* -----------------------------------------------------------------------

TIM2 配置: 產(chǎn)生TIM2_CC2時(shí)鐘控制信號用于控制ADC采樣

TIM2CLK =72 MHz

TIM2 ARR Register = 35 => TIM3 Frequency = (TIM3 counter clock/(ARR + 1))/2

TIM2 Frequency = 1000 KHz.

----------------------------------------------------------------------- */

/* Time base configuration */

TIM_TimeBaseStructure.TIM_Period = 35; //APR寄存器

TIM_TimeBaseStructure.TIM_Prescaler = 1000000/Frequency-1; //預(yù)分頻值，用來調(diào)整頻率，分頻系數(shù)=1000khz/(prescaler+1)

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* TIM_OCMode_Toggle Mode configuration: Channel2 */

/* TIM使能 */

TIM_Cmd(TIM2, ENABLE);

/* TIM 輸出使能 */

TIM_CtrlPWMOutputs(TIM2, ENABLE);

}