#include <stm32f10x.h> 

u32 PressData;
u32 TempData;

// MCU TYPE: STM32F103RCT6
//IO setup
#define SDA_IN()  {GPIOC->CRH&=0XFFFF0FFF;GPIOC->CRH|=8<<12;}
#define SDA_OUT() {GPIOC->CRH&=0XFFFF0FFF;GPIOC->CRH|=3<<12;}

//IO define	 
#define IIC_SCL    PCout(12) //SCL  PA5
#define IIC_SDA    PCout(11) //SDA  PA7	 
#define READ_SDA   PCin(11)  //input SDA 

//system clock initial
void Stm32_Clock_Init(u8 PLL)
{
	unsigned char temp=0;   
	MYRCC_DeInit();		  
 	RCC->CR|=0x00010000;  
	while(!(RCC->CR>>17));
	RCC->CFGR=0X00000400; 
	PLL-=2;		
	RCC->CFGR|=PLL<<18;   
	RCC->CFGR|=1<<16;     
	FLASH->ACR|=0x32;	     
	RCC->CR|=0x01000000;  
	while(!(RCC->CR>>25));
	RCC->CFGR|=0x00000002;
	while(temp!=0x02)     
	{   
		temp=RCC->CFGR>>2;
		temp&=0x03;
	}    
}
//system delay initial
void delay_init(u8 SYSCLK)
{
#if SYSTEM_SUPPORT_OS 			
	u32 reload;
#endif
 	SysTick->CTRL&=~(1<<2);		 
	fac_us=SYSCLK/8;			
#if SYSTEM_SUPPORT_OS 			
	reload=SYSCLK/8;			  
	reload*=1000000/delay_ostickspersec;	
						
	fac_ms=1000/delay_ostickspersec;	   
	SysTick->CTRL|=1<<1;   		
	SysTick->LOAD=reload; 		
	SysTick->CTRL|=1<<0;   		
#else
	fac_ms=(u16)fac_us*1000;		
#endif
}		
//delay n us
void delay_us(u32 nus)
{		
	u32 temp;	    	 
	SysTick->LOAD=nus*fac_us; 			  		 
	SysTick->VAL=0x00;        		
	SysTick->CTRL=0x01 ;      			 
	do
	{
		temp=SysTick->CTRL;
	}while((temp&0x01)&&!(temp&(1<<16)));	  
	SysTick->CTRL=0x00;      	 	
	SysTick->VAL =0X00;       		
}
//delay n ms
void delay_ms(u16 nms)
{	 		  	  
	u32 temp;		   
	SysTick->LOAD=(u32)nms*fac_ms;	
	SysTick->VAL =0x00;           		
	SysTick->CTRL=0x01 ;          		
	do
	{
		temp=SysTick->CTRL;
	}while((temp&0x01)&&!(temp&(1<<16)));	   
	SysTick->CTRL=0x00;      	 	
	SysTick->VAL =0X00;       		  	    
}
//IIC initial
void IIC_Init(void)
{					     
 	RCC->APB2ENR|=1<<4;							 
	GPIOC->CRH&=0XFFF00FFF;
	GPIOC->CRH|=0X00033000;	   
	GPIOC->ODR|=3<<11;    
}
//IIC start
void IIC_Start(void)
{
	SDA_OUT();    
	IIC_SDA=1;
  delay_us(4);	
	IIC_SCL=1;
	delay_us(4);
 	IIC_SDA=0; 
	delay_us(4);
	//IIC_SCL=0; 
}	  
//IIC stop
void IIC_Stop(void)
{
	SDA_OUT();
	//IIC_SCL=0;
	IIC_SDA=0;
 	delay_us(4); 
	IIC_SCL=1;
 	delay_us(4); 
	IIC_SDA=1;					   	
}
//wait ack
//return:1,recieve fail
//        0,recieve success
u8 IIC_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA_IN();       
	IIC_SDA=1;delay_us(1);	   
	IIC_SCL=1;delay_us(1);	 
	while(READ_SDA)
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			IIC_Stop();
			return 1;
		}
	}
	IIC_SCL=0; 	   
	return 0;  
} 
//ACK
void IIC_Ack(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=0;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}
//NACK		    
void IIC_NAck(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=1;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}					 				     
//IIC write one byte
void IIC_Send_Byte(u8 txd)
{                        
    u8 t;   
    SDA_OUT(); 	    
    IIC_SCL=0;
    for(t=0;t<8;t++)
    {              
      IIC_SDA=(txd&0x80)>>7;
      txd<<=1; 	  
      delay_us(2);   
      IIC_SCL=1;
      delay_us(2); 
      IIC_SCL=0;	
      delay_us(2);
    }	 
} 	    
//IIC read one byte,ack=1,send ACK,ack=0,send nACK   
u8 IIC_Read_Byte(unsigned char ack)
{
  unsigned char i,receive=0;
  SDA_IN();
  for(i=0;i<8;i++ )
  {
        IIC_SCL=0; 
        delay_us(2);
        IIC_SCL=1;
        receive<<=1;
        if(READ_SDA)receive++;   
        delay_us(1); 
    }					 
    if (!ack)
    IIC_NAck();
    else
    IIC_Ack();    
    return receive;
}

void Read_ASM10_Sensor(void)
{
u32 PressData;
u32 TempData;
u8 Read_Data[7] = {0x00};
	u8 Status = 0x00;
	u8 I2c_Address = 0x29;
	u8 Read_Commond = 0xAC;
	IIC_Init();
	delay_ms(50);
	IIC_Start();
	IIC_Send_Byte((I2c_Address)<<1|0);//write
	IIC_Wait_Ack();
	IIC_Send_Byte(Read_Commond);//1mps
	IIC_Wait_Ack();
	IIC_Stop();
	delay_ms(100);
	IIC_Start();
	IIC_Send_Byte((I2c_Address)<<1|1);//read
	IIC_Wait_Ack();
	Read_Data[0] = IIC_Read_Byte(1);//STATUS[7:0]
	Read_Data[1] = IIC_Read_Byte(1);//PRESSURE[23:16]
	Read_Data[2] = IIC_Read_Byte(1);//PRESSURE[15:8]
	Read_Data[3] = IIC_Read_Byte(1);//PRESSURE[7:0]
	Read_Data[4] = IIC_Read_Byte(1);//TEMPERATURE[23:16]
	Read_Data[5] = IIC_Read_Byte(1);//TEMPERATURE[15:8]
	Read_Data[6] = IIC_Read_Byte(0);//TEMPERATURE[7:0]
	IIC_Stop();	
	Status = Read_Data[0];
	PressData = (Read_Data[1]<<16)|(Read_Data[2]<<8)|Read_Data[3];
	TempData  = (Read_Data[4]<<16)|(Read_Data[5]<<8)|Read_Data[6];
}

int main(void)
{	
   Stm32_Clock_Init(9);
  delay_init(72);	   
  while(1) 
  {
    Read_ASM10_Sensor();
    delay_ms(1000);
  }	  
}