标准模版——添加IIC功能模块

一、iic.h代码

#include "STC15F2K60S2.H"
#include "intrins.h"

sbit sda=P2^1;
sbit scl=P2^0;

unsigned char PCF8591_ADC(void);
void PCF8591_DAC(unsigned char dat);
void EEPROM_Read(unsigned char *pucRuf,unsigned char addr,unsigned char num);
void EEPROM_Write(unsigned char *pucRuf,unsigned char addr,unsigned char num);

二、iic.c代码

/*	#   I2C代码片段说明
	1. 	本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
	2. 	参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题
		中对单片机时钟频率的要求，进行代码调试和修改。
*/
#include "iic.h"
#define DELAY_TIME	5

//
static void I2C_Delay(unsigned char n)
{
    do
    {
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();		
    }
    while(n--);      	
}

//
void I2CStart(void)
{
    sda = 1;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 0;
	I2C_Delay(DELAY_TIME);
    scl = 0;    
}

//
void I2CStop(void)
{
    sda = 0;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 1;
	I2C_Delay(DELAY_TIME);
}

//
void I2CSendByte(unsigned char byt)
{
    unsigned char i;
	
    for(i=0; i<8; i++){
        scl = 0;
		I2C_Delay(DELAY_TIME);
        if(byt & 0x80){
            sda = 1;
        }
        else{
            sda = 0;
        }
		I2C_Delay(DELAY_TIME);
        scl = 1;
        byt <<= 1;
		I2C_Delay(DELAY_TIME);
    }
	
    scl = 0;  
}

//
unsigned char I2CReceiveByte(void)
{
	unsigned char da;
	unsigned char i;
	for(i=0;i<8;i++){   
		scl = 1;
		I2C_Delay(DELAY_TIME);
		da <<= 1;
		if(sda) 
			da |= 0x01;
		scl = 0;
		I2C_Delay(DELAY_TIME);
	}
	return da;    
}

//
unsigned char I2CWaitAck(void)
{
	unsigned char ackbit;
	
    scl = 1;
	I2C_Delay(DELAY_TIME);
    ackbit = sda; 
    scl = 0;
	I2C_Delay(DELAY_TIME);
	
	return ackbit;
}

//
void I2CSendAck(unsigned char ackbit)
{
    scl = 0;
    sda = ackbit; 
	I2C_Delay(DELAY_TIME);
    scl = 1;
	I2C_Delay(DELAY_TIME);
    scl = 0; 
	sda = 1;
	I2C_Delay(DELAY_TIME);
}

unsigned char PCF8591_ADC(void)
{
	unsigned char temp;
	
	/**********************写入**********************/
	I2CStart();//开始
	I2CSendByte(0x90);//发送写地址
	I2CWaitAck();//等待应答
	
	I2CSendByte(0x43);//发送光敏电阻控制位
	I2CWaitAck();//等待应答
	
	/**********************读取**********************/
	I2CStart();//开始
	I2CSendByte(0x91);//发送读地址
	I2CWaitAck();//等待应答
	
	temp=I2CReceiveByte();//接收
	I2CSendAck(1);//发送应答
	I2CStop();//终止通信
	
	return temp;
}

void PCF8591_DAC(unsigned char dat)
{
	I2CStart();//开始
	I2CSendByte(0x90);//发送写地址
	I2CWaitAck();//等待应答
	
	I2CSendByte(0x41);//发送光敏电阻控制位
	I2CWaitAck();//等待应答
	
	I2CSendByte(dat);//发送光敏电阻控制位
	I2CWaitAck();//等待应答
	I2CStop();
	  
}

void EEPROM_Read(unsigned char *pucRuf,unsigned char addr,unsigned char num)
{
	I2CStart();
	I2CSendByte(0xA0);//发送设备地址
	I2CWaitAck();//等待应答
	
	I2CSendByte(addr);//发送写入位置
	I2CWaitAck();
	
	I2CStart();
	I2CSendByte(0xA1);//发送读取地址
	I2CWaitAck();
	
	while(num--)
	{
		*pucRuf++= I2CReceiveByte();
		 if(num)
			 I2CSendAck(0);
		 else
			 I2CSendAck(1);
	}
	I2CStop();//终止通信	
}

void EEPROM_Write(unsigned char *pucRuf,unsigned char addr,unsigned char num)
{
	I2CStart();
	I2CSendByte(0xA0);//发送设备地址
	I2CWaitAck();//等待应答
	
	I2CSendByte(addr);//发送读取位置
	I2CWaitAck();
	
	while(num--)
	{
		I2CSendByte(*pucRuf++);
		I2CWaitAck();
		I2C_Delay(200);//加入延时，不至于导致总线过于繁忙，有助于总线稳定性
	}
	
	I2CStop();//终止通信	
}

三、主函数代码

#include "tim.h"
#include "init.h"
#include "led.h"
#include "seg.h"
#include "stdio.h"//sprintf所需头文件
#include "key.h"
#include "peripheral.h"
#include "ds1302.h"
#include "iic.h"
//Timer
unsigned long ulms=0;
unsigned int uiLed_Dly=0;
unsigned int uiSeg_Dly=0;
unsigned int uiKey_Dly=0;
unsigned int uiPeripheral_Dly=0;
unsigned int uiRTC_Dly=0;
unsigned int uiADC_Dly=0;
unsigned int uiDAC_Dly=0;
//LED
unsigned char ucLed=0x25;
//Seg
unsigned char ucSeg_Pos=0;
unsigned char pucSeg_Buf[12],pucSeg_Code[8];
//KEY
unsigned char ucKey_Val=0;
//RTC
unsigned char pucRTC[3]={23,59,55};
//ADC
unsigned char ucADC=0;

//Function
void Led_Proc(void);
void Seg_Proc(void);
void Key_Proc(void);
void Peripheral_Proc(void);
void RTC_Proc(void);
void ADC_Proc(void);
void DAC_Proc(void);

void main()
{
	Cls_Peripheral();
	Timer0Init();
	EEPROM_Read(pucRTC,0x00,3);//读出先前存到EEPROM芯片里的数据，然后传给pucRTC
	if(pucRTC[0]>23||pucRTC[1]>59||pucRTC[2]>59)
	{
		pucRTC[0]=23;
		pucRTC[1]=59;
		pucRTC[2]=55;
	} 
	Set_RTC(pucRTC);
	EA=1;
	
	while(1)
	{
		Led_Proc();
		Seg_Proc();
		Key_Proc();
		Peripheral_Proc();
		RTC_Proc();
		ADC_Proc();
		DAC_Proc();
	}
}
void Led_Proc(void)
{
	if(uiLed_Dly<200)
		return;
	uiLed_Dly=0;
	Led_Disp(ucLed);
}
void Seg_Proc(void)
{
	if(uiSeg_Dly<200)
	return;
	uiSeg_Dly=0;
	
	sprintf(pucSeg_Buf,"%03u     ",(unsigned int)ucADC);//将文字存储到数组中
	Seg_Tran(pucSeg_Buf,pucSeg_Code);//将存入的数组中的内容转换成段码
}
void Key_Proc(void)
{
	if(uiKey_Dly<20)
		return;
	uiKey_Dly=0;
	ucKey_Val=Key_Read_KBD();
}
void Peripheral_Proc(void)
{
	if(uiPeripheral_Dly<500)
		return;
	uiPeripheral_Dly=0;
	Set_Peripheral(0,1);
}
void RTC_Proc(void)
{
	if(uiRTC_Dly<500)
		return;
	uiRTC_Dly=0;
	Get_RTC(pucRTC);
	EEPROM_Write(pucRTC,0x00,3);
}
void ADC_Proc(void)
{
	if(uiADC_Dly<500)
		return;
	uiADC_Dly=0;
	
	ucADC=PCF8591_ADC();
}
void DAC_Proc(void)
{
	if(uiDAC_Dly<500)
		return;
	uiDAC_Dly=0;
	PCF8591_DAC(ucADC);
}
void Time_0(void) interrupt 1
{
	ulms++;
	uiLed_Dly++;
	uiSeg_Dly++;
	uiKey_Dly++;
	uiPeripheral_Dly++;
	uiRTC_Dly++;
	uiADC_Dly++;
	uiDAC_Dly++;
	
	if(ulms%2==0)//数码管2ms循环一次，因为数码管没有办法一次性显示不同内容，因此逐位去点来点亮
	{
		ucSeg_Pos=(ucSeg_Pos+1)%8;//ucSeg_Pos会在0-7之间循环，依次点亮数码管的每个位
		Seg_Disp(pucSeg_Code,ucSeg_Pos);//基于段码，让对应的位进行显示
		
	}
}