#include "RX8F103.h"
#define STCON MSCON
#define SRXBUF MSRXBUF
#define STXBUF MSTXBUF
#define SSTAT0 MSSTAT0
#define SSTAT1 MSSTAT1
#define SIEN0 MSIEN0
#define SIEN1 MSIEN1
#define SSADDR MSADDR
//I2C主機多字節，單字節讀寫
//I2C Master 和 I2C Slave通信協議
/*
S + DevAdd(Read) + BayteN + Stop
S + DevAdd(Write) + BayteN + Stop
*/
//I2C從機地址 7位地址
#define I2C_SLAVE_ADD 0x50
#define BUFF_MAX 128
unsigned char xdata DataBuf[BUFF_MAX];
unsigned char DataTxIndex = 0;
unsigned char DataRxIndex = 0;
unsigned char InterruptIndex = 0;
unsigned char WrtieTxBufFlag = 0;
void EUart0_SendOneChar(char c)
{
ES0=0; //發送數據時關串口中斷
TI0=0; //清TI位
S0BUF = c; //將待發送字符放入串口數據緩沖寄存器，并開始傳輸。
while(!TI0); //等待傳送結束。當字符發送結束后由硬件置位請求中斷，
//此時while循環結束，而串口中斷處理函數需等到ES重新置1后才可能響應。
TI0=0; //軟件清TI位，亦可在中斷處理函數中清0
ES0 = 1; //開串口中斷
}
void EUart0_SendString(char *st)
{
while(*st)
{
EUart0_SendOneChar(*st++);
}
}
void Uart0_init(void)
{
UART0PORTEN = 1; //串口端口使能
S0CON = 0x50; //SCON: Mode 1, 8-bit UART, Enable Rcvr
S0RELH = 0x03; //S0RELH + S0RELL 構成波特率設置S0REL[9:0]
S0RELL = 0xF7; //Baud rate = SYSCK/(16×(1024-S0REL)) SYSCK跟CLKDIV寄存器有關 波特率為115200
ES0 = 1; //允許串口中斷位
EUart0_SendString("RX8F103 UART0 Init OK!\r\n");
}
void I2c_Init(void)
{
I2CPORTEN = 1; //IIC PORT口使能
TOPCON = 0x00; //IIC Slave
SSADDR = I2C_SLAVE_ADD;//IIC 從機地址寄存器
SIEN0 = 0x01; //正常結束中斷
SIEN1 = 0x21; //使能接收區滿中斷
STCON = 0x40; //使能I2C
}
void I2c_TxBuf_Reset(void)
{
TOPCON |= 0x02;
TOPCON &= 0xFD;
I2c_Init();
}
void main(void)
{
unsigned char i;
CLKCON |= 0x1F; //默認所有時鐘打開
RSTPORTEN = 1; //使能復位功能
Uart0_init();
//初始化數組
for (i=0; i<BUFF_MAX; i++)
{
DataBuf[ i] = 0x10+i;
}
I2c_Init();
EI2CFIFO = 1; //開IIC FIFO 中斷
EI2CRXTX = 1; //開IIC TXRX 中斷
EA = 1; //使能總中斷
while(1);
}
/*
GC
SUNF
SOVF
SNE
以上任意一個或多個事件發送，均為產生EI2CRXTX中斷
*/
void I2C_Slave_TRX_ISR(void) interrupt EI2CRXTX_VECTOR //TRX中斷
{
unsigned char ReadData;
//Transmitted Data Byte not ready
if (0x04 == (SSTAT0 & 0x04))
{
//清中斷標志位
SSTAT0 &= 0xFB;
}
//Receive Overflow
if (0x02 == (SSTAT0 & 0x02))
{
ReadData = SRXBUF;
//清中斷標志位
SSTAT0 &= 0xFD;
}
//Normal End
if (0x01 == (SSTAT0 & 0x01))
{
InterruptIndex = 0;
WrtieTxBufFlag = 0;
I2c_TxBuf_Reset();
//清中斷標志位
SSTAT0 &= 0xFE;
}
}
/*
STBE
STBF
SRBE
SRBF
以上任意一個或多個事件發送，均為產生EI2CFIFO中斷
*/
void I2C_Slave_FIFO_ISR(void) interrupt EI2CFIFO_VECTOR //FIFO中斷
{
unsigned char ReadData;
//Transmission buffer is empty
if (0x20 == (SSTAT1 & 0x20))
{
if ((DataTxIndex < BUFF_MAX) && (1 == WrtieTxBufFlag))
{
STXBUF = DataBuf[DataTxIndex];
DataTxIndex++;
}
SSTAT1 &= 0xDF;
}
// Reception buffer is full
if (0x01 == (SSTAT1 & 0x01))
{
ReadData = SRXBUF;
if (0 == InterruptIndex)
{
//收到Sub地址
if (ReadData < BUFF_MAX)
{
DataTxIndex = ReadData;
DataRxIndex = ReadData;
WrtieTxBufFlag = 1;
}
}
else
{
WrtieTxBufFlag = 0;
if (DataRxIndex < BUFF_MAX)
{
DataBuf[DataRxIndex] = ReadData;
DataRxIndex++;
}
}
InterruptIndex++;
SSTAT1 &= 0xFE;
}
}
/*---------------------------------EUART0 ISR--------------------------------------------*/
void EUART0ISR(void) interrupt EUART0_VECTOR //using 2
{
if(S0CON & RI0) //接收中斷
{
}
RI0 = 0; //清中斷標志位
}
程序主要不懂在下面這一段
if (0 == InterruptIndex)
{
//收到Sub地址
if (ReadData < BUFF_MAX)
{
DataTxIndex = ReadData;
DataRxIndex = ReadData;
WrtieTxBufFlag = 1;
}
}
else
{
WrtieTxBufFlag = 0;
if (DataRxIndex < BUFF_MAX)
{
DataBuf[DataRxIndex] = ReadData;
DataRxIndex++;
}
}
InterruptIndex++;
SSTAT1 &= 0xFE;
}
}
為什么if (0 == InterruptIndex)要這樣判斷，這樣的不就會丟失第一個數據么
if (ReadData < BUFF_MAX)
{
DataTxIndex = ReadData;
DataRxIndex = ReadData;
WrtieTxBufFlag = 1;這段程序到底是啥意思，看不懂
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