给你个例程看看就知道了
/*******************************************************************************
STM32学习日志(9)----ADC 规则组-注入组转换
编译环境: EWARM V5.30
硬件环境: 南京万利 EK-STM32F
主芯片 : STM32F103VBT6
STM32 FW: V3.0.0
作者 : szlihongtao
时间 : 2010-07-01
说明 : 1. 在 SysTick 定时中断程序中刷新LCD的显示
2. DMA1保存数据
*******************************************************************************/
/**
******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] Project/Template/main.c
* [url=home.php?mod=space&uid=187600]@author[/url] MCD Application Team
* [url=home.php?mod=space&uid=895143]@version[/url] V3.0.0
* [url=home.php?mod=space&uid=212281]@date[/url] 04/06/2009
* [url=home.php?mod=space&uid=247401]@brief[/url] Main program body
******************************************************************************
* @copy
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2009 STMicroelectronics</center></h2>
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_m.h"
#include "lcd.h"
//******************************************************************************
#define ADC1_DR_Address ((u32)0x4001244C) // ADC1->DR
#define SIZE_AVE (64)
//******************************************************************************
bit f_tb; // 基本定时标志
static INT16U tmr_1sec,cnt_test;
__IO INT16U ADC_ConvertedValue[SIZE_AVE];
//******************************************************************************
extern bit f_adc;
extern INT16U code_adc;
//******************************************************************************
static void delayms(INT16U cnt)
{
INT16U i;
while(cnt--)
for (i=0; i<7333; i++);
}
//******************************************************************************
// 延时50ms
//******************************************************************************
static void delay(void)
{
INT32U i;
static INT32U jjj=5240*50;
for (i=0; i<jjj; i++);
}
//******************************************************************************
// 时钟设置初始化
//******************************************************************************
static void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/*
RCC_AdjustHSICalibrationValue 调整内部高速晶振(HSI)校准值
RCC_ITConfig 使能或者失能指定的RCC中断
RCC_ClearFlag 清除RCC的复位标志位
RCC_GetITStatus 检查指定的RCC中断发生与否
RCC_ClearITPendingBit 清除RCC的中断待处理位
*/
/* RCC system reset(for debug purpose) */
// 时钟系统复位
RCC_DeInit();
// 使能外部的8M晶振
// 设置外部高速晶振(HSE)
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
// 使能或者失能内部高速晶振(HSI)
RCC_HSICmd(DISABLE);
// 等待HSE起振
// 该函数将等待直到HSE就绪,或者在超时的情况下退出
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
// 设置AHB时钟(HCLK)
RCC_HCLKConfig(RCC_SYSCLK_Div1); // 72 MHz
/* PCLK1 = HCLK/2 */
// 设置低速AHB时钟(PCLK1)
RCC_PCLK1Config(RCC_HCLK_Div2); // 36 MHz
/* PCLK2 = HCLK */
// 设置高速AHB时钟(PCLK2)
RCC_PCLK2Config(RCC_HCLK_Div1); // 72 MHz
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
/* ADCCLK = PCLK2/8 */
// 设置ADC时钟(ADCCLK)
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
// 设置USB时钟(USBCLK)
// USB时钟 = PLL时钟除以1.5
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
// 设置外部低速晶振(LSE)
RCC_LSEConfig(RCC_LSE_OFF);
// 使能或者失能内部低速晶振(LSI)
// LSE晶振OFF
RCC_LSICmd(DISABLE);
// 设置RTC时钟(RTCCLK)
// 选择HSE时钟频率除以128作为RTC时钟
RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
// 使能或者失能RTC时钟
// RTC时钟的新状态
RCC_RTCCLKCmd(DISABLE);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* PLLCLK = 8MHz * 9 = 72 MHz */
// 设置PLL时钟源及倍频系数
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
// 使能或者失能PLL
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
// 检查指定的RCC标志位设置与否
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
// 设置系统时钟(SYSCLK)
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
// 返回用作系统时钟的时钟源
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
// 使能或者失能AHB外设时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1
|RCC_AHBPeriph_DMA2
|RCC_AHBPeriph_SRAM
|RCC_AHBPeriph_FLITF
|RCC_AHBPeriph_CRC
|RCC_AHBPeriph_FSMC
|RCC_AHBPeriph_SDIO,DISABLE);
// 使能或者失能APB1外设时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_ALL,DISABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); // dma1时钟使能
// 强制或者释放高速APB(APB2)外设复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,ENABLE);
// 退出复位状态
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,DISABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); // adc时钟使能
// 强制或者释放低速APB(APB1)外设复位
RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,ENABLE);
// 强制或者释放后备域复位
RCC_BackupResetCmd(ENABLE);
// 使能或者失能时钟安全系统
RCC_ClockSecuritySystemCmd(DISABLE);
}
//******************************************************************************
// NVIC设置
//******************************************************************************
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* enabling interrupt */
NVIC_InitStructure.NVIC_IRQChannel=ADC1_2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable DMA channel1 IRQ Channel */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//******************************************************************************
// SysTick设置初始化
//******************************************************************************
static void SysTick_Config1(void)
{
#define SystemFreq 72000000.0 // 单位为Hz
#define TB_SysTick 2000.0 // 单位为uS
INT32U ticks;
ticks=(INT32U)((TB_SysTick/1000000.0)*SystemFreq);
ticks=ticks;
SysTick_Config(ticks);
}
//******************************************************************************
// GPIO设置
//******************************************************************************
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// 使能或者失能APB2外设时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4; // key
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_Init(GPIOC, &GPIO_InitStructure); // lcd_comm
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All; // lcd_seg
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Configure PC.00 (ADC Channel10) as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
//******************************************************************************
static void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel1); // DMA复位
DMA_StructInit(&DMA_InitStructure);// DMA缺省的参数
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //外设地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;//内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //dma传输方向,单向
DMA_InitStructure.DMA_BufferSize = SIZE_AVE; //设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//设置DMA的外设递增模式,一个外设
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//设置DMA的内存递增模式,
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //内存数据字长
//循环模式开启,Buffer写满后,自动回到初始地址开始传输
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //设置DMA的传输模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //设置DMA的优先级别
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //设置DMA的2个memory中的变量互相访问
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_ClearFlag(DMA1_IT_TC1);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA1_Channel1, ENABLE);
}
//******************************************************************************
static void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_DeInit(ADC1); // ADC参数复位
ADC_StructInit(&ADC_InitStructure); // 默认的参数
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;// ADC1与ADC2工作在独立模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE; // 多通道
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; // 连续转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;// 软件触发启动
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;// ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 4; // 进行规则转换的ADC通道的数目
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_55Cycles5);// 电位器
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_55Cycles5);// 电位器
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_55Cycles5);// 内部参考电压
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 4, ADC_SampleTime_55Cycles5);// 内部参考电压
/* Set injected sequencer length */
ADC_InjectedSequencerLengthConfig(ADC1, 4);
/* ADC1 injected channel Configuration */
ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_55Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_55Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_55Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 4, ADC_SampleTime_55Cycles5);
ADC_SetInjectedOffset(ADC1,ADC_InjectedChannel_1,2);
ADC_SetInjectedOffset(ADC1,ADC_InjectedChannel_2,2);
ADC_SetInjectedOffset(ADC1,ADC_InjectedChannel_3,2);
ADC_SetInjectedOffset(ADC1,ADC_InjectedChannel_4,2);
/* ADC1 injected external trigger configuration */
ADC_ExternalTrigInjectedConvConfig(ADC1, ADC_ExternalTrigInjecConv_None);
/* Enable automatic injected conversion start after regular one */
ADC_AutoInjectedConvCmd(ADC1, ENABLE);
ADC_ITConfig(ADC1,ADC_IT_JEOC,ENABLE); // 允许 JEOC 中断
ADC_ClearFlag(ADC1,ADC_FLAG_EOC); // 清除中断标志位
ADC_DMACmd(ADC1, ENABLE); // DMA使能
ADC_Cmd(ADC1, ENABLE); // 使能ADC
ADC_ResetCalibration(ADC1); // 校准
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1); // 校准
while(ADC_GetCalibrationStatus(ADC1));
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
//******************************************************************************
// LED5亮
//******************************************************************************
void Led_RW_ON(void)
{
GPIO_SetBits(GPIOC,GPIO_Pin_4);
}
//******************************************************************************
// LED5灭
//******************************************************************************
void Led_RW_OFF(void)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_4);
}
//******************************************************************************
// pos=0-3
//******************************************************************************
static void myWrite_char(u8 pos,char car,u8 f_dot)
{
write_char(&car,f_dot,pos);
}
//******************************************************************************
static void disp_adc(INT16U code_adc1)
{
INT8U i,ch;
for(i=0;i<4;++i)
{
ch=code_adc1%10;
code_adc1/=10;
ch+=0x30;
myWrite_char(3-i,ch,0);
}
}//******************************************************************************
// 主程序
//******************************************************************************
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
SysTick_Config1();
DMA_Configuration();
Led_RW_ON();
delay();
Led_RW_OFF();
//------------------------------------------------------------------------------
write_string("STM "); /*STM32 LCD demo*/
delayms(444);
write_string("ADC ");
delayms(444);
write_string("TEST");
delayms(444);
ADC_Configuration();
//------------------------------------------------------------------------------
for(;;)
{
if (f_tb) // 每隔2ms设置为1
{
f_tb=0;
cnt_test++;
if (++tmr_1sec>=(300/2))
{
tmr_1sec=0;
GPIOC->ODR ^= GPIO_Pin_6; // led3 toogle
disp_adc(ADC_ConvertedValue[1]);
}
}
}
}
//******************************************************************************
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval : None
*/
void assert_failed(uint8_t* file, uint32_t 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
/**
* @}
*/
//******************************************************************************
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
//******************************************************************************
/*
LED2---------PC7
LED3---------PC6
LED4---------PC5
LED5---------PC4
KEY2---------PD3
KEY3---------PD4
*/