ATC的IIC通信协议PPT教学课件

1、按“页”写操作，“页”是指高位地址一样一组数据，对于24C01/02/04/08/16,24C01/02/04/08/16,一页数据为1616字节，一页指高四位地址一样的一组数据。STARTSTART 发送器件地址ackack 发送页首地址ackack 发送数据ack.ack. 发送数据ackack STOP STOP第1页/共20页当前单字节读操作，“当前”指的是前面进行过读操作，但是没有STOPSTOP，芯片内部“指针”指的字节即为“当前”字节。STARTSTART 发送器件地址（读）ackack 接收数据no ackno ackSTOPSTOP第2页/共20页随机单字节读操作STARTS

2、TART 发送器件地址（写）ackack 发送字节地址ackackSTARTSTART 发送器件地址（读）ackack 接收数据no ackno ackSTOPSTOP第3页/共20页当前连续字节读操作STARTSTART 发送器件地址（读）ackack 接收数据ackack 接收数据 ack.ack.接收数据( (最后字节）no ackno ackSTOPSTOP随机连续字节读操作STARTSTART 发送器件地址（写）ackack 发送字节首地址ackackSTARTSTART 发送器件地址（读） ack ack 接收数据ackack 接收数据ack.ack.接收数据( (最后字节） no

3、acknoackSTOPSTOP第4页/共20页编程实例 主发送程序设计 主接收程序设计 IIC中断程序 测试程序第5页/共20页第6页/共20页第7页/共20页#define WRDATA （1） /写操作#define POLLACK （2） /返回ACK操作#define RDDATA （3） /读数据操作#define SETRDADDR (4) /设置地址操作#define IICBUFSIZE 0 x20 /数据缓冲大小static U8 _iicDataIICBUFSIZE; /数据缓存static volatile int _iicdataCount; /数据计数 static

4、 volatile int _iicStatus; /数据状态static volatile int _iicMode; /操作状态static int _iicPt;第8页/共20页void Wr24c080(U32 slvaddr,U32 addr,U8 data) _iicMode = WRDATA; _iicPt = 0; _iicData0 = (U8)addr; _iicData1 = data; _iccDataCount = 2; rIICDS = slvAddr; /器件地址 0 xa0 rIICSTAT = 0 xf0; /主发送，开始 while(_iccDataCoun

5、t!=-1);第9页/共20页 _iccMode = POLLACK; while(1) rIICDS = slvAddr; _iicStatus = 0 x100; rIICSTAT = 0 xf0; /主发送，开始 rIICCON = 0 xaf; /Resumes IIC operation while(_iicStatus = 0 x100); if(!(_iicStatus&0 x1)break; /接收到ACK rIICSTAT = 0 xd0; /Stop MasTx condition rIICCON = 0 xaf; /Resumes IIC operation Delay(

6、1); /Wait until stop condtion is in effect第10页/共20页第11页/共20页第12页/共20页void Rd24C080(U32 slvAddr,U32 addr,U8 *data) _iicMode = SETRDADDR; /设置要从从机读取数据的从地址 _iicPt = 0; _iicData0 = (U8)addr; _iicDataCount = 1; /写从地址 rIICDS = slvAddr; rIICSTAT = 0 xf0; /MasTx,Start /Clearing the pending bit isnt needed be

7、cause the pending bit has been cleared. while(iicDataCount!=-1) ； _iicMode = RDDATA; /读数据模式 _iicPt = 0; _iicDataCount = 1; rIICDS = slvAddr; rIICSTAT = 0 xb0; /Master Rx,Start rIICCON = 0 xaf; /Resumes IIC operation. while(iicDataCount!=-1); *data = iicData1; 第13页/共20页void _irq IicInt(void) U32 iicS

8、t,i; rSRCPND = BIT_IIC;/清中断 rINTPND = BIT_IIC; iicSt = rIICSTAT; iicSt = rIICSTAT; /ICC状态寄存器 if(iicSt & 0 x8) /总线仲裁失败 if(iicSt & 0 x4) /从地址与ICCADD地址匹配 if(iicSt & 0 x2) /从地址为00000000b if(iicSt & 0 x1) /未收到ACK switch(_iicMode) case POLLACK: _iicStatus = iicSt; break; 第14页/共20页 case RDDATA: /从从机中读取数据 i

9、f(_iicDataCount-)=0) _iicDataiicPt+ = rIICDS; rIICSTAT = 0 x90; /Stop MasRx condition rIICCON = 0 xaf; /Resumes IIC operation. Delay(1); /Wait until stop condtion is in effect. /Too long time. /The pending bit will not be set after issuing stop condition. break; _iicDataiicPt+ = rIICDS; /The last da

10、ta has to be read with no ack. if(_iicDataCount)=0) rIICCON = 0 x2f; /Resumes IIC operation with NOACK. else rIICCON = 0 xaf; /Resumes IIC operation with ACK break; 第15页/共20页 case WRDATA: /写数据到从机 if(_iicDataCount-)=0) rIICSTAT = 0 xd0; /stop MasTx condition rIICCON = 0 xaf; /resumes IIC operation. D

11、elay(1); /wait until stop condtion is in effect. /The pending bit will not be set after issuing stop condition. break; rIICDS = _iicDataiicPt+; /iicData0 has dummy. for(i=0;i10;i+); /for setup time until rising edge of IICSCL rIICCON = 0 xaf; /resumes IIC operation. break; 第16页/共20页 case SETRDADDR:

12、/设置要从从机机读取数据的从机地址 /Uart_printf(S%d,_iicDataCount); if(_iicDataCount-)=0) break; /IIC operation is stopped because of IICCON4 rIICDS = _iicData_iicPt+; for(i=0;i10;i+); /for setup time until rising edge of IICSCL rIICCON = 0 xaf; /resumes IIC operation. break; default: break; 第17页/共20页void Main(void)

13、 unsigned int i,j,save_E,save_PE; static U8 data256; /用于存储AT24C08读出的数据 Uart_Printf(IIC Test(Interrupt)n); save_E = rGPECON;/保护现场 save_PE = rGPEUP; rGPEUP |= 0 xc000; /上拉禁止 rGPECON |= 0 xa00000; /GPE15：IICSDA，GPE14：IICSCL pISR_IIC = (unsigned)Iicint; rINTMSK &= (BIT_IIC) /使能应答, 时钟预分频选择IICCLK=PCLK/16, 中断使能, /发送时钟值 Tx clock = IICCLK/(IICCON3:0+1) rIICCON = (17) | (06) | (15) | (0 xf); rIICADD = 0 x10; /2410 从机地址 = 7:1 rIICSTAT = 0 x10; /IIC总线数据输出使能(Rx/Tx) 第18页/共20页 Uart_Printf(Write test data n); for(i=0;i256;i+) Wr24C02(0 xa0,(U8)i,i);/Line changed 0f