给你个AD DMA的例程看看
/**
******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] DMA/ADC1_DMA/main.c
* [url=home.php?mod=space&uid=187600]@author[/url] MCU SD
* [url=home.php?mod=space&uid=895143]@version[/url] V1.0
* [url=home.php?mod=space&uid=212281]@date[/url] 26-Dec-2014
* [url=home.php?mod=space&uid=247401]@brief[/url] Main program body.
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "gd32f10x.h"
#include "main.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define RCC_GPIO_LED1 RCC_APB2PERIPH_GPIOC
#define GPIO_LED1_PORT GPIOC
#define RCC_GPIO_LED2 RCC_APB2PERIPH_GPIOC
#define GPIO_LED2_PORT GPIOC
#define GPIO_LED1 GPIO_PIN_0
#define GPIO_LED2 GPIO_PIN_2
#define RCC_GPIO_LED3 RCC_APB2PERIPH_GPIOE
#define GPIO_LED3_PORT GPIOE
#define RCC_GPIO_LED4 RCC_APB2PERIPH_GPIOE
#define GPIO_LED4_PORT GPIOE
#define GPIO_LED3 GPIO_PIN_0
#define GPIO_LED4 GPIO_PIN_1
/* Private variables ---------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#define ADC_DR_Address ((u32)0x4001244C)
float AD_value;
__IO uint16_t ADC_ConvertedValue;
DMA_InitPara DMA_InitStructure;
__IO uint32_t TimingDelay = 0;
void RCC_Configuration(void);
static void SysTickConfig(void);
void USART_Configuration(void);
void ADC_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* System Clocks Configuration */
RCC_Configuration();
/* SysTick configuration */
SysTickConfig();
LED_config() ;
GPIO_SetBits(GPIO_LED1_PORT, GPIO_LED1);
GPIO_ResetBits(GPIO_LED3_PORT, GPIO_LED3);
GPIO_ResetBits(GPIO_LED2_PORT, GPIO_LED2);
GPIO_ResetBits(GPIO_LED4_PORT, GPIO_LED4);
USART_Configuration();
/* DMA1 channel1 configuration */
DMA_DeInit(DMA1_CHANNEL1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PERIPHERALSRC;
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_DISABLE;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PERIPHERALDATASIZE_HALFWORD;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MEMORYDATASIZE_HALFWORD;
DMA_InitStructure.DMA_Mode = DMA_MODE_CIRCULAR;
DMA_InitStructure.DMA_Priority = DMA_PRIORITY_VERYHIGH;
DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;
DMA_Init(DMA1_CHANNEL1, &DMA_InitStructure);
/* Enable DMA transfer */
DMA_Enable(DMA1_CHANNEL1, ENABLE);
ADC_Configuration();
Delay(300);
while (1)
{
/***********************************************ADC采集转换********************************************************/
/* Printf message with AD value to serial port every 1 second */
AD_value = ADC_ConvertedValue;
AD_value = (AD_value/4096)*3.3;
printf("The current AD value = %4.2fV \r\n", AD_value);
Delay(1000); /* delay 1000ms */
}
}
/**
* @brief Led configure
* @param None
* @retval None
*/
void LED_config(void)
{
GPIO_InitPara GPIO_InitStructure;
/* Enable the GPIO_LED Clock */
RCC_APB2PeriphClock_Enable(RCC_GPIO_LED1 | RCC_GPIO_LED2 | RCC_GPIO_LED3 | RCC_GPIO_LED4, ENABLE);
/* Configure the GPIO_LED pin */
GPIO_InitStructure.GPIO_Pin = GPIO_LED1 | GPIO_LED2;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUT_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_Init(GPIO_LED1_PORT, &GPIO_InitStructure);
GPIO_Init(GPIO_LED2_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_LED3 | GPIO_LED4;
GPIO_Init(GPIO_LED3_PORT, &GPIO_InitStructure);
GPIO_Init(GPIO_LED4_PORT, &GPIO_InitStructure);
}
/**
* @brief Configure the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
/* Enable peripheral clocks */
/* Enable DMA1 clock */
RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_DMA1, ENABLE);
}
void USART_Configuration(void)
{
GPIO_InitPara GPIO_InitStructure;
USART_InitPara USART_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_GPIOC | RCC_APB2PERIPH_GPIOA | RCC_APB2PERIPH_AF, ENABLE);
USART_InitStructure.USART_BRR = 115200;
USART_InitStructure.USART_WL = USART_WL_8B;
USART_InitStructure.USART_STBits = USART_STBITS_1;
USART_InitStructure.USART_Parity = USART_PARITY_RESET;
USART_InitStructure.USART_HardwareFlowControl = USART_HARDWAREFLOWCONTROL_NONE;
USART_InitStructure.USART_RxorTx = USART_RXORTX_RX | USART_RXORTX_TX;
/* Enable USART clock */
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_USART1, ENABLE);
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_9;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART configuration */
USART_Init(USART1, &USART_InitStructure);
/* Enable USART */
USART_Enable(USART1, ENABLE);
USART_ClearBitState(USART1,USART_FLAG_TC);
}
/*******************************************************************************
* Function Name : ADC_Configuration
* Description : Configure the ADC.
* Input : None
* Output : None
* Return : None
* Attention : None
*******************************************************************************/
void ADC_Configuration(void)
{
ADC_InitPara ADC_InitStructure;
GPIO_InitPara GPIO_InitStructure;
RCC_ADCCLKConfig(RCC_ADCCLK_APB2_DIV6);
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_ADC1 | RCC_APB2PERIPH_GPIOC | RCC_APB2PERIPH_AF, ENABLE);
/* Configure PC.03 (ADC12 Channel3)as analog input -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_PIN_3;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_MODE_INDEPENDENT;
ADC_InitStructure.ADC_Mode_Scan = ENABLE;
ADC_InitStructure.ADC_Mode_Continuous = ENABLE;
ADC_InitStructure.ADC_Trig_External = ADC_EXTERNAL_TRIGGER_MODE_NONE;
ADC_InitStructure.ADC_Data_Align = ADC_DATAALIGN_RIGHT;
ADC_InitStructure.ADC_Channel_Number = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel 0 configuration */
ADC_RegularChannel_Config(ADC1, ADC_CHANNEL_13, 1, ADC_SAMPLETIME_239POINT5);
/* Enable ADC1 DMA */
ADC_DMA_Enable(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Enable(ADC1, ENABLE);
/* Enable ADC1 calibaration register */
ADC_Calibration(ADC1);
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv_Enable(ADC1, ENABLE);
}
/**
* @brief Configure a SysTick Base time to 1 ms.
* @param None
* @retval None
*/
static void SysTickConfig(void)
{
/* Setup SysTick Timer for 1ms interrupts */
if (SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while (1);
}
/* Configure the SysTick handler priority */
NVIC_SetPriority(SysTick_IRQn, 0x0);
}
/**
* @brief Insert a delay time.
* @param nTime: specify the delay time length.
* @retval None
*/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @brief Decrement the TimingDelay variable.
* @param None
* @retval None
*/
void TimingDelay_Decrement(void)
{
if(TimingDelay != 0x00)
{
TimingDelay --;
}
}
/**
* @brief Retarget the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_DataSend(USART1, (uint8_t) ch);
/* Loop until the end of transmission */
while (USART_GetBitState(USART1, USART_FLAG_TC) == RESET)
{}
return ch;
}
/******************* (C) COPYRIGHT 2014 GIGADEVICE *****END OF FILE****/
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