奇怪，为什么Ad只在初始化的时候起动一次以后，再也没起动呢

lb_zhong 提问时间：2010-11-8 14:04 /

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : Main program body
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address    ((u32)0x4001244C)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ADC_InitTypeDef           ADC_InitStructure;
DMA_InitTypeDef           DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
vu16 ADC_RegularConvertedValueTab[32];
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);

void ADC_Sample_Frequency_Set(u32 Frequency)
{
TIM_Cmd(TIM2, DISABLE);//先停止TIM2时钟，以准备下面的设置
/* -----------------------------------------------------------------------
TIM2 配置: 产生TIM2_CC2时钟控制信号用于控制ADC采样
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; //预分频值，用来调整频率，分频系数=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_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;//TIM_OCMode_Toggle;
//TIM_OCInitStructure.TIM_Channel = TIM_Channel_2;
TIM_OCInitStructure.TIM_Pulse = 35;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
/*---------------------------------------*/
TIM_ARRPreloadConfig(TIM2, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();

/* DMA1 Channel1 Configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC_RegularConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 32;
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;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
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(ADC1, &ADC_InitStructure);
/* ADC1 regular channel14 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_13Cycles5);
/* Set injected sequencer length */
//ADC_InjectedSequencerLengthConfig(ADC1, 1);
/* ADC1 injected channel Configuration */
//ADC_InjectedChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_71Cycles5);
/* ADC1 injected external trigger configuration */
//ADC_ExternalTrigInjectedConvConfig(ADC1, ADC_ExternalTrigInjecConv_None);
/* Enable automatic injected conversion start after regular one */
//ADC_AutoInjectedConvCmd(ADC1, ENABLE);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 external trigger */
ADC_ExternalTrigConvCmd(ADC1, ENABLE);
/* Enable JEOC interupt */
//ADC_ITConfig(ADC1, ADC_IT_JEOC, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* 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));
ADC_ExternalTrigConvCmd( ADC1, ENABLE);
/* Test on channel1 transfer complete flag */
// while(!DMA_GetFlagStatus(DMA1_FLAG_TC1));
/* Clear channel1 transfer complete flag */
// DMA_ClearFlag(DMA1_FLAG_TC1);
ADC_Sample_Frequency_Set(5);
/*
   TIM_DeInit(TIM2); //TIM2初始化


TIM_TimeBaseStructure.TIM_Period = 0x4AF; //72M的一秒
TIM_TimeBaseStructure.TIM_Prescaler = 0xEA5F; //72M/ea5f=4af
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
//TIM_OCInitStructure.TIM_Channel = TIM_Channel_2;
TIM_OCInitStructure.TIM_Pulse = 0x0;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);

TIM_PrescalerConfig(TIM2, 0xEA5F, TIM_PSCReloadMode_Immediate);

TIM_ClearFlag(TIM2, TIM_FLAG_Update);

TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInit(TIM2, &TIM_ICInitStructure);

TIM_ARRPreloadConfig(TIM2, ENABLE);

TIM_Cmd(TIM2, ENABLE);
*/
/* Enable TIM2 Update interrupt */
//TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    /* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

/* Enable the TIM2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (1)
{
}
}
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 DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable GPIOA, GPIOC, ADC1 and TIM1 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
                         RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOB , ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure TIM1_CH1 (PA8) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

/* Configure PC.01 and PC.04 (ADC Channel11 and Channel14) as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PC.06, PC.07, PC.08 as output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}

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
/* Enable ADC1_2 IRQChannel */
/*NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); */
}
#ifdef DEBUG

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
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/