main.c

来自「stm32初级例程」· C语言 代码 · 共 361 行

/*----------------------------------------------------------------------------
本例子通过串口发送AD0的值，AD0连接一个NTC温度电阻

 
用手触摸NTC温度电阻,输出数字将变化
使用我提供的串口调试工具，选择【串口超级终端】波特率设置115200

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

/* Includes ------------------------------------------------------------------*/
#define SYS_GLOBALS
#include "include.h"

#define ADC1_DR_Address    ((u32)0x4001244C)


/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);
void USART1_InitConfig(uint32 BaudRate);
/* Private functions ---------------------------------------------------------*/

/*----------------------------------------------------------------------------
  从串口发送一个字节数据
  Write character to Serial Port.
 *----------------------------------------------------------------------------*/
int SendChar (int ch)  {

  //等待发送结束
  while (!(USART1->SR & USART_FLAG_TXE));
  //将数据放入发送寄存器
  USART1->DR = (ch & 0x1FF);

  return (ch);
}

/*----------------------------------------------------------------------------
  从串口读取一个字节数据，直到读到数据才返回
  Read character to Serial Port.
 *----------------------------------------------------------------------------*/
int GetKey (void)  {

  //等待接收结束
  while (!(USART1->SR & USART_FLAG_RXNE));
  //从接受寄存器读取数据并返回
  return ((int)(USART1->DR & 0x1FF));
}


unsigned short int  ADC_ConvertedValue;
/*------------------------------------------------------------------------------
  Initialises the Analog/Digital converter
  PA1 (ADC Channel1) is used as analog input
  use DMA Channel1 for ADC1 (see DMA request mapping)
 *------------------------------------------------------------------------------*/
void adc_Init (void) {
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

  
  //使能GPIO时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);	
  /* Configure PC.04 (ADC Channel14) as analog input -------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;		    //GPIO设置为模拟输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  // enable periperal clock for DMA
  //使能DMA时钟
//  RCC->AHBENR |= (1<<0);                          
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
//  DMA1_Channel1->CMAR  = (u32)&ADC_ConvertedValue;// set channel1 memory address
//  DMA1_Channel1->CPAR  = (u32)&(ADC1->DR);        // set channel1 peripheral address
//  DMA1_Channel1->CNDTR = 1;                       // transmit 1 word
//  DMA1_Channel1->CCR   = 0x00002520;              // configure DMA channel
//  DMA1_Channel1->CCR  |= (1 << 0);                // DMA Channel 1 enable

/* DMA1 channel1 configuration 配置DMA通道----------------------------------------------*/
  DMA_DeInit(DMA1_Channel1);
  //设置通道1外设地址
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  //设置DMA内存地址，ADC转换结果直接放入该地址
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  //DMA传送1个字
  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_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);
  
  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);				   //使能DMA通道

//  RCC->APB2ENR |= (1<<9);                         // enable periperal clock for ADC1
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//  ADC1->SQR1  = 0x00000000;                       // only one conversion
//  ADC1->SMPR2 = 0x00000028;                       // set sample time channel1 (55,5 cycles)
//  ADC1->SQR3  = 0x00000001;                       // set channel1 as 1st conversion

//  ADC1->CR1   = 0x00000100;                       // use independant mode, SCAN mode
//  ADC1->CR2   = 0x000E0103;                       // use data align right,continuous conversion
                                                  // EXTSEL = SWSTART 
                                                  // enable ADC, DMA mode, no external Trigger
//  ADC1->CR2  |=  0x00500000;					  // start SW conversion
  /* ADC1 configuration 配置ADC------------------------------------------------------*/
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
   //使用独立模式，扫描模式
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  //无需外接触发器
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  //使用数据右对齐
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  // 只有1个转换通道
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 regular channel-0 configuration */
  //通道1采样周期55.5个时钟周期
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

  /* Enable ADC1 DMA */
  //使能ADC的DMA
  ADC_DMACmd(ADC1, ENABLE);
  
  /* Enable ADC1 */
  //使能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));
     
  /* Start ADC1 Software Conversion */
  //开始转换
  ADC_SoftwareStartConvCmd(ADC1, ENABLE); 

}

void Delay(unsigned long time)
{unsigned long i,j;
  
	for(j=0; j<time; j++)
	{
	   for(i=0;i<12000;i++);
	}
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif
int AD_value;
  /* System Clocks Configuration */
  RCC_Configuration();//配置系统时钟   

  GPIO_Configuration();//配置GPIO
  

  /* NVIC configuration */
  NVIC_Configuration();//配置中断

  USART1_InitConfig(115200);
  adc_Init();
  printf ("ADC Example\r\n\r\n");

  while (1)
  {                                     // Loop forever
     //Delay(1000);
	   
	   //为了方便观察软件仿真好观察采用下面的延时
	   Delay(50);
	   AD_value  = ADC_ConvertedValue;
	   printf("AD value = 0x%04X\r\n", AD_value);
  } // end while
  
}

void USART1_InitConfig(uint32 BaudRate)
{USART_InitTypeDef USART_InitStructure;
 GPIO_InitTypeDef GPIO_InitStructure; 
  
  //使能串口的RCC时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
  
  //串口使用的GPIO口配置
  /* Configure USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  /* Configure USART1 Tx (PA.09) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //配置串口
  USART_InitStructure.USART_BaudRate = BaudRate;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  /* Configure USART1 */
  USART_Init(USART1, &USART_InitStructure);//配置串口1

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);//使能串口1
}
/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{ErrorStatus HSEStartUpStatus;   
  
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);//使能外部时钟 

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();//等待外部时钟就绪

  if(HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer 启用预取缓冲器 */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state FLASH设置2个等待周期*/
    FLASH_SetLatency(FLASH_Latency_2);
 
    /* HCLK = SYSCLK 设置系统设置*/
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK PCLK2时钟=主时钟*/
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 PCLK1时钟为主时钟1/2*/
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* PLLCLK = 8MHz * 9 = 72 MHz 设置时钟为72M*/
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL 使能PLL*/ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready 等待PLL工作稳定*/
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source 选择PLL做为系统时钟源*/
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source 准备就绪，开始干活*/
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /* Enable GPIO_LED clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能GPIO时钟
  //LED_init-------------------------------------------------------

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);			 //设置GPIO为输出
  
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{

//#ifdef  VECT_TAB_RAM
#if defined (VECT_TAB_RAM)
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //设置中断向量在RAM中
//#elif defined(VECT_TAB_FLASH_IAP)
//  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x2000);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); //设置中断向量在FLASH中  
#endif


}




#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

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