本例展示了如何使用双ADC对多路通道进行同时转化。
使用ADC1对通道14和通道17进行转化。使用ADC2对通道10和通道11进行转化。通道17与内部参考电压Vref相连。
一旦转换开始，ADC1和ADC2对对通道14和10的转换将同时开始，结果存于ADC1的32-bit DR寄存器内，其中高16bit为ADC2对通道10的转换结果，低16bit为ADC1对通道14的转换结果。之后由DMA把DR寄存器内的数据传送到内存中的ADC_DualConvertedValueTab表格。随后，ADC1和ADC2以及DMA会对通道17和通道11进行同样流程的转换和数据传送。
这样的转换-传送将会持续进行直到传送的数据数目达到DMA预设的上限。
然后利用LCD把通道17上Vref的值，和通道10上分压器VR1上的电压值交替显示在屏幕上作为验证。
#include "stm32f10x_lib.h"
#include "lcd.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address ((u32)0x4001244C)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
vu32 ADC_DualConvertedValueTab[16];
ErrorStatus HSEStartUpStatus;
vu16 TempvalueCh10,TempvalueCh17;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void LcdShow_Init(void);
void displayconvert(vu16 value);
/* Private functions ---------------------------------------------------------*/
void delay(void);
void delay()
{
int i,j; j=0;
for (i=0; i<0xfffff; i++) j++;
}
char display[4]={0,0};
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
LcdShow_Init();
/* DMA channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC_DualConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 16;
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA_Channel1, &DMA_InitStructure);
/* Enable DMA Channel1 */
DMA_Cmd(DMA_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC1和ADC2工作在同步规则和同步注入模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 2;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channels configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_17, 2, ADC_SampleTime_239Cycles5);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* ADC2 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC1和ADC2工作在同步规则和同步注入模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 2;
ADC_Init(ADC2, &ADC_InitStructure);
/* ADC2 regular channels configuration */
ADC_RegularChannelConfig(ADC2, ADC_Channel_10, 1, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 2, ADC_SampleTime_239Cycles5);
/* Enable ADC2 external trigger conversion */
ADC_ExternalTrigConvCmd(ADC2, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable Vrefint channel17 */
ADC_TempSensorVrefintCmd(ENABLE);
//使能温度传感器和内部参考电压通道
/* Enable ADC1 reset calibaration register */
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 */
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));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
/* Test on Channel 1 DMA_FLAG_TC flag */
while(!DMA_GetFlagStatus(DMA_FLAG_TC1));// DMA_FLAG_TC flag----- 通道1传输完成标志位
/* Clear Channel 1 DMA_FLAG_TC flag */
DMA_ClearFlag(DMA_FLAG_TC1);
while (1)// 在LCD 上交替显示
{
/*Show Channel17 (Vintref) and Channel10 (Vpontentiometer) on LCD*/
vu16 TempvalueCh17 = ADC_DualConvertedValueTab[7] & 0xffff;
vu16 TempvalueCh10 = ADC_DualConvertedValueTab[8] >> 16;
displayconvert(TempvalueCh17);
write_string(display);
delay();
delay();
displayconvert(TempvalueCh10);
write_string(display);
delay();
delay();
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* ADCCLK = PCLK2/4 */
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
/* PLLCLK = 8MHz * 7 = 56 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_7);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* Enable peripheral clocks --------------------------------------------------*/
/* Enable DMA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);
/* Enable ADC1, ADC2 and GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 |
RCC_APB2Periph_GPIOC, ENABLE);
/* Enable GPIOE clock for LCD display
(PC.08 -- PC.11: COM1~4; PE.00 -- PE.15: SEG0~15 )*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
/* TIM2 clocks enable */ //For LCD display
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure PC.00, PC.01 and PC.04 (ADC Channel10, Channel11 and Channel14)
as analog input ----------------------------------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure PE.00 -- PE.15 as Output push-pull : SEG0~15 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Configure PC.08 -- PC.11 as Output push-pull : COM1~4 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
/* enabling interrupt */ // For LCD enable IT from TIM2
NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/***************************************************************************
* Function Name : LcdShow_Init
* Description : Configures TIM2 for LCD display
* Input : None
* Output : None
* Return : None
***************************************************************************/
void LcdShow_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 8000;
TIM_TimeBaseStructure.TIM_Prescaler = 17;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM2,DISABLE);
/* only counter overflow/underflow generate U interrupt */
TIM_UpdateRequestConfig(TIM2,TIM_UpdateSource_Regular);
/* Output Compare Timing Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;
TIM_OCInitStructure.TIM_Pulse = 4000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInit(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_Update, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
/***************************************************************************
* Function Name : displayconvert
* Description : convert data to displayable form
* Input : None
* Output : None
* Return : None
***************************************************************************/
void displayconvert(vu16 value)
{
u8 num1 = value&0xf;
u8 num2 = (value&0xff)>>4;
u8 num3= (value&0xfff)>>8;
u8 num4 = value>>12;
if (num1>9)
display[3]=num1+(65-10);
else
display[3]=num1+(48-0);
if (num2>9)
display[2]=num2+(65-10);
else
display[2]=num2+(48-0);
if (num3>9)
display[1]=num3+(65-10);
else
display[1]=num3+(48-0);
if (num4>9)
display[0]=num4+(65-10);
else
display[0]=num4+(48-0);
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* Input : - file: pointer to the source file name
* - line: assert_param error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
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