发一个新唐M051I2C的使用例程

只看该作者 · 2015-2-15 17:16

本帖最后由 cowboy2014 于 2015-2-15 17:17 编辑

新唐M051 IIC使用程序
#include "SmartM_M0.h"
#define DEBUGMSG printf
#define EEPROM_SLA             0xA0
#define EEPROM_WR             0x00
#define EEPROM_RD             0x01
#define I2C_CLOCK             13
#define PAGE_SIZE             8
/*****************************************
*函数名称:Timed_Write_Cycle
*输入:无
*输出:无
*功能:同步的写周期
******************************************/
void Timed_Write_Cycle(void)
{
while (I2STATUS != 0x18)
{
      //启动
      I2CON |= STA;
      I2CON |= SI;
      while ((I2CON & SI) != SI);
      I2CON &= ((~STA) & (~SI));
  //设备地址
      I2DAT = EEPROM_SLA | EEPROM_WR;
      I2CON |= SI;
      while ((I2CON & SI) != SI);
}
if (I2STATUS != 0x18)                      //检查应答
{
   DEBUGMSG("Not ACK returned!");
}
//停止
I2CON |= STO;
I2CON |= SI;
while (I2CON & STO);
}
/*****************************************
*函数名称:I2CInit
*输入:无
*输出:无
*功能:I2C初始化
******************************************/
VOID I2CInit(VOID)
{
P3_PMD &= ~(Px4_PMD | Px5_PMD);
P3_PMD |= (Px4_OD | Px5_OD);             //使能I2C0引脚
P3_MFP &= ~(P34_T0_I2CSDA | P35_T1_I2CSCL);
P3_MFP |= (I2CSDA | I2CSCL);       //选择P3.4,P3.5作为I2C0功能引脚
APBCLK |= I2C0_CLKEN;                      //使能I2C0时钟
I2CLK = I2C_CLOCK;
I2CON |= ENSI;                            //使能I2C
}
/*****************************************
*函数名称:AT24C0XWrite
*输入:unAddr 写地址
      pucData  写数据
unLength 写长度
*输出:TRUE/FALSE
*功能:AT24C0X写数据
******************************************/
BOOL AT24C0XWrite(UINT32 unAddr,UINT8 *pucData,UINT32 unLength)
{
UINT32 i;
I2CON |= STA;             //启动
I2CON |= SI;
while ((I2CON & SI) != SI);
I2CON &= ((~STA)&(~SI));
if (I2STATUS != 0x08)
{
      DEBUGMSG("I2CStart fail,I2STATUS %02X ",I2STATUS);
  return FALSE;
}
//进入读写控制操作
I2DAT = EEPROM_SLA | EEPROM_WR;
I2CON |= SI;
while ((I2CON & SI) != SI);
if (I2STATUS != 0x18)
{
   DEBUGMSG("I2C write control fail ");
   return FALSE;
}
//写地址
I2DAT = unAddr;
I2CON |= SI;
while ((I2CON & SI) != SI);
if (I2STATUS != 0x28)
{
      DEBUGMSG("I2C write addr fail ");
   return FALSE;
}
//写数据
for(i=0; i<unLength; i++)
{
   I2DAT = *(pucData+i);
   I2CON |= SI;
   while ((I2CON & SI) != SI);
   if (I2STATUS != 0x28)
   {
      DEBUGMSG("I2C write data fail ");
   return FALSE;
   }
}
//停止
I2CON |= STO;
I2CON |= SI;
while (I2CON & STO);
//DEBUGMSG("I2C stop ok ");
Timed_Write_Cycle();
return TRUE;
}
/*****************************************
*函数名称:AT24C0XRead
*输入:unAddr 读地址
      pucData  读数据
unLength 读长度
*输出:TRUE/FALSE
*功能:AT24C0X读数据
******************************************/
BOOL AT24C0XRead(UINT32 unAddr,UINT8 *pucData,UINT32 unLength)
{
UINT32 i;
I2CON |= STA;                //启动
I2CON |= SI;
while ((I2CON & SI) != SI);
I2CON &= ((~STA)&(~SI));
if (I2STATUS != 0x08)
{
      DEBUGMSG("I2CStart fail,I2STATUS %02X ",I2STATUS);
  return FALSE;
}
//进入读写控制操作
I2DAT = EEPROM_SLA | EEPROM_WR;
I2CON |= SI;
while ((I2CON & SI) != SI);
if (I2STATUS != 0x18)
{
   DEBUGMSG("I2C write control fail ");
   return FALSE;
}
//写入读地址
I2DAT = unAddr;
I2CON |= SI;
while ((I2CON & SI) != SI);
if (I2STATUS != 0x28)
{
      DEBUGMSG("I2C write addr fail ");
   return FALSE;
}
// 重新启动
I2CON |= STA;
I2CON |= SI;
while ((I2CON & SI) != SI);
I2CON &= ((~STA)&(~SI));
if (I2STATUS != 0x10)
{
      DEBUGMSG("I2C repeated start fail ");
  return FALSE;
}
//进入读操作
I2DAT = EEPROM_SLA | EEPROM_RD;
I2CON |= SI;
while ((I2CON & SI) != SI);
if (I2STATUS != 0x40)
{
      DEBUGMSG("I2C write control fail ");
      while (1);
}
//读取数据
I2CON |= AA;
for(i=0; i<unLength; i++)
{
   I2CON |= SI;
   while ((I2CON & SI) != SI);
   if (I2STATUS != 0x50)
   {
      DEBUGMSG("I2C read fail ");
      return FALSE;
   }
  *(pucData+i) = I2DAT;
}
//发送NACK到AT24C02，执行断开连接操作
I2CON &= (~AA);
I2CON |= SI;
while ((I2CON & SI) != SI);
//停止
I2CON |= STO;
I2CON |= SI;
while (I2CON & STO);
DEBUGMSG("I2C read ok ");
return TRUE;
}
VOID AT24C02ContinousWrite(UINT32 unAddr,UINT8 *pucData,UINT32 unLength)
{
UINT32 i,m,n;
UINT32 unCurWirteCount=0;
//if(unLength <= 32)
m = PAGE_SIZE-(unAddr % PAGE_SIZE); //与当前每页32个字节已剩下多少个字节
if(unLength <= m)
{
AT24C0XWrite(unAddr,pucData,unLength);
}
else
{
AT24C0XWrite(unAddr,pucData,m);
unLength -=m;
unCurWirteCount+=m;
m = unLength/PAGE_SIZE;
n = unLength%PAGE_SIZE;
for(i=0; i<m; i++)
{
      AT24C0XWrite(unAddr+unCurWirteCount,pucData+unCurWirteCount,PAGE_SIZE);
   unCurWirteCount += PAGE_SIZE;
}
AT24C0XWrite(unAddr+unCurWirteCount,pucData+unCurWirteCount,n);
}
}
/*****************************************
*函数名称:main
*输入:无
*输出:无
*功能:函数主体
******************************************/
INT32 main(VOID)
{
  UINT8 i,buf[32];
   Un_Lock_Reg();       //ISP下载时保护FLASH存储器
  PWRCON |= XTL12M_EN;    //默认时钟源为外部晶振
  while((CLKSTATUS & XTL12M_STB) == 0); //等待12MHz时钟稳定
  CLKSEL0 = (CLKSEL0 & (~HCLK)) | HCLK_12M; //设置外部晶振为系统时钟
  UartInit(12000000,9600);    //波特率设置为9600bps
  I2CInit();
  DEBUGMSG("I2C Test ");
//  while(1)
//  {
   for(i=0; i<sizeof(buf); i++) //初始化写缓冲区
{
      buf=0x55;
}
   DEBUGMSG(" AT24C0XWrite Test ");
AT24C0XWrite(0,buf,sizeof(buf));  //执行写操作
Delayms(500);
//==================================================
   DEBUGMSG("AT24C0XRead Test ");
   for(i=0; i<sizeof(buf); i++) //初始化读缓冲区
{
      buf=0x00;
}
AT24C0XRead(0,buf,sizeof(buf)); //执行读操作
for(i=0; i<10; i++)
{
   DEBUGMSG("%02X ",buf);    //打印读取的数值
}
Delayms(500);
//  }
while(1);
}