来源:百度文库 编辑:神马文学网 时间:2024/07/03 08:05:56
#include "2440addr.h"
extern void Uart_Printf(char *fmt,...);
void Wr24C02(U32 slvAddr,U32 addr,U8 data);
void Rd24C02(U32 slvAddr,U32 addr,U8 *data);
void Run_IicPoll(void);
void IicPoll(void) ;
void Delay(int x) ;
static U8 iicData[IICBUFSIZE];
static volatile int iicDataCount;
static volatile int iicStatus;
static volatile int iicMode;
static int iicPt;
void iicMain(void)
{
unsigned int i,j;
static U8 data[256];
Uart_Printf("IIC Test(Polling) using AT24C02\n");
//设置GPE15->IICSDA 和 GPE14->IICSCL
rGPEUP |= 0xc000; //Pull-up disable
rGPECON &= ~0xf0000000;
rGPECON |= 0xa0000000; //GPE15:IICSDA , GPE14:IICSCL
//Enable ACK, Prescaler IICCLK=PCLK/16, Enable interrupt, Transmit clock value Tx clock=IICCLK/16
rIICCON = (1<<7) | (0<<6) | (1<<5) | (0xf); //0xaf
rIICADD = 0x10; //2440 slave address = [7:1]
rIICSTAT = 0x10; //IIC bus data output enable(Rx/Tx)
Uart_Printf("Write test data into AT24C02\n");
//写入一个page的数据,page的大小是256byte,
//page 的起始地址是0xa0,写入的数据是:0、1、2、...255。0xa0是AT24C02的页地址。
//AT24C02的页地址是0x00/0x20/0x40/0x60/0x80/0xa0/0xc0/0xe0。
for(i=0;i<256;i++)
Wr24C02(0xa0,(U8)i,i);//U32 slvAddr,U32 addr,U8 data
//初始化data数组的值为0。
for(i=0;i<256;i++)
data[i] = 0;
Uart_Printf("Read test data from AT24C02\n");
//读24C02的0xa0地址中数据到data数组中。
for(i=0;i<256;i++)
Rd24C02(0xa1,(U8)i,&(data[i]));
//输出data数组接收数据的值
for(i=0;i<16;i++)
{
for(j=0;j<16;j++)
Uart_Printf("%2x ",data[i*16+j]);
Uart_Printf("\n");
}
Uart_Printf("OK! Write data is same to Read data!\n");
while(1);
}
void Wr24C02(U32 slvAddr,U32 addr,U8 data)
{
iicMode = WRDATA;
iicPt = 0;
iicData[0] = (U8)addr;
iicData[1] = data;
iicDataCount = 2;
//8-bit data shift register for IIC-bus Tx/Rx operation.
rIICDS = slvAddr; //0xa0
//Master Tx mode, Start(Write), IIC-bus data output enable
//Bus arbitration sucessful, Address as slave status flag Cleared,
//Address zero status flag cleared, Last received bit is 0
rIICSTAT = 0xf0;
//Clearing the pending bit isn't needed because the pending bit has been cleared.
while(iicDataCount!=-1)
Run_IicPoll();
iicMode = POLLACK;
while(1)
{
rIICDS = slvAddr;
iicStatus = 0x100; //To check if _iicStatus is changed
rIICSTAT = 0xf0; //Master Tx, Start, Output Enable, Sucessful, Cleared, Cleared, 0
rIICCON = 0xe0;//0xaf; //Resumes IIC operation. //hzh
while(iicStatus==0x100)
Run_IicPoll();
if(!(iicStatus & 0x1))
break;