main.c

lpc2131的I2C通讯程序

/********************************************************************************************************
**名称:I2C总线使用例子
**描述:使用I2C总线向24CXX系列EEPROM写入数据，然后读出。
**器件:LPC2131@12MHz
********************************************************************************************************/

#include <lpc213X.h>
#include <stdint.H>
#include "config.h"

#define  DEBUG_FLASH
__swi(0x00) void SwiHandle1(int Handle);

#define IRQDisable() SwiHandle1(0)
#define IRQEnable() SwiHandle1(1)
#define FIQDisable() SwiHandle1(2)
#define FIQEnable() SwiHandle1(3)

#define	AT24C16 0xA0		        //EEPROM从器件地址

const unsigned long DS2=(1<<24);	//P1.24控制LED1，低电平点亮 
const unsigned long DS3=(1<<25);	//P0.25控制LED1，低电平点亮 
const unsigned long BELL=(1<<8);	//P0.8控制蜂鸣器，低电平点响 

void Delay(uint32_t dly);
void TargetResetInit(void);
void FIQ_Exception(void);
void timer0_int(void);
void I2cInit(unsigned long Fi2c);

int main(void)
{
   unsigned char count=0;
   unsigned char data_buf[16]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
                               0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x00};

   unsigned long temp=0;

   TargetResetInit();

   temp = PINSEL2;
   temp |= 0x00000004; 
   PINSEL2 = temp;		    // 设置管脚连接Jtag
   PINSEL0 = 0x00000000;	//设置管脚连接GPIO
   PINSEL1 = 0x00000000;	//设置管脚连接GPIO
   
   I2cInit(400000);			//I2C初始化

   IO1DIR=DS2;

   I2C_WriteNByte(AT24C16, ONE_BYTE_SUBA, 0x00, data_buf, 16);
   Delay(1);
   /* 清零数据缓冲区，确保读出的内容与EEPROM一致*/
   for (count=0; count<16; count++)data_buf[count] = 0;
   /* 读回刚才写入的数据 */
   I2C_ReadNByte(AT24C16, ONE_BYTE_SUBA, 0x00, data_buf, 16);
   Delay(1);
   IO1SET = DS2;            //此处添加断点观察data_buf数组内容********************************
    
   while(1)		
   {					   
	IO1SET = DS2;			// DS2熄灭
	Delay(50);
	IO1CLR = DS2;			// DS2点亮
	Delay(50);
   }
   
}


/*
*********************************************************************************************************
** 函数名称 ：I2cInit()
** 函数功能 ：I2C初始化
** 入口参数 ：Fi2c	I2C总线频率(最大400K)
** 出口参数 ：无
*********************************************************************************************************
*/
void I2cInit(unsigned long Fi2c)
{
	if (Fi2c > 400000)
		Fi2c = 400000;
		
   	//PINSEL0 = (PINSEL0 & 0xFFFFFF0F) | 0x50; 			/* 设置I2C控制口有效 				*/
	PINSEL0 = (PINSEL0 & (~0xF0)) | 0x50; 	// 不影响其它管脚连接
	I2C0SCLH = (Fpclk/Fi2c + 1) / 2;						/* 设定I2C时钟 						*/
	I2C0SCLL = (Fpclk/Fi2c)/2;
	I2C0CONCLR = 0x2C;
	I2C0CONSET = 0x40;									/* 使能主I2C 						*/
	
	/* 设置I2C中断允许 */
	VICIntSelect = 0x00000000;							/* 设置所有通道为IRQ中断 			*/
	VICVectCntl0 = (0x20 | 0x09);						/* I2C通道分配到IRQ slot0，最高优先级 */
	VICVectAddr0 = (long)IRQ_I2C;						/* 设置I2C中断向量 					*/
	VICIntEnable = (1 << 9);							/* 使能I2C中断 						*/
}

void Delay(uint32_t dly)
{
	uint32_t i=0;
	
	for ( ; dly>0; dly--)
	{
      WDFEED = 0xAA;		// 喂狗时序
	  WDFEED = 0x55;
	  for(i=0;i<50000;i++)
	  {
	   i++;
	  }
    }
}


void timer0_int(void)
{
    while(1);                   //  change it to your code 这一句替换为自己的代码
}


void FIQ_Exception(void)
{
    while(1);                   // change it to your code  这一句替换为自己的代码
}


void TargetResetInit(void)
{
#ifdef DEBUG_RAM    
    MEMMAP = 0x2;                   //remap
#endif

#ifdef DEBUG_FLASH    
    MEMMAP = 0x1;                   //remap
#endif

#ifdef IN_CHIP    
    MEMMAP = 0x1;                   //remap
#endif

/* 设置系统各部分时钟 */
/* Set system timers for each component */
    PLLCON = 1;
#if (Fpclk / (Fcclk / 4)) == 1
    VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    VPBDIV = 1;
#endif

#if (Fcco / Fcclk) == 2
    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
#endif
#if (Fcco / Fcclk) == 8
    PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
#endif
#if (Fcco / Fcclk) == 16
    PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
#endif
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    while((PLLSTAT & (1 << 10)) == 0);
    PLLCON = 3;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    
/* 设置存储器加速模块 */
/* Set memory accelerater module*/
    MAMCR = 0;
#if Fcclk < 20000000
    MAMTIM = 1;
#else
#if Fcclk < 40000000
    MAMTIM = 2;
#else
    MAMTIM = 3;
#endif
#endif
    MAMCR = 2;
    
/* 初始化VIC */
/* initialize VIC*/
 VICIntEnClr = 0xffffffff;
 VICVectAddr = 0;
 VICIntSelect = 0;

    /* 添加自己的代码 */

}