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ZDBMS/code_drv/TWI.c

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2025-02-06 07:35:32 +00:00
/********************************************************************************
Copyright (C), Sinowealth Electronic. Ltd.
Author: Sino
Version: V0.0
Date: 2020/04/26
History:
V2.0 2020/04/26 Preliminary
********************************************************************************/
#include "Main.h"
#ifdef TWI_Hardware_Module
U8 code CRC8Table[256]=
{ //120424-1 CRC Table
0x00,0x07,0x0E,0x09,0x1C,0x1B,0x12,0x15,0x38,0x3F,0x36,0x31,0x24,0x23,0x2A,0x2D,
0x70,0x77,0x7E,0x79,0x6C,0x6B,0x62,0x65,0x48,0x4F,0x46,0x41,0x54,0x53,0x5A,0x5D,
0xE0,0xE7,0xEE,0xE9,0xFC,0xFB,0xF2,0xF5,0xD8,0xDF,0xD6,0xD1,0xC4,0xC3,0xCA,0xCD,
0x90,0x97,0x9E,0x99,0x8C,0x8B,0x82,0x85,0xA8,0xAF,0xA6,0xA1,0xB4,0xB3,0xBA,0xBD,
0xC7,0xC0,0xC9,0xCE,0xDB,0xDC,0xD5,0xD2,0xFF,0xF8,0xF1,0xF6,0xE3,0xE4,0xED,0xEA,
0xB7,0xB0,0xB9,0xBE,0xAB,0xAC,0xA5,0xA2,0x8F,0x88,0x81,0x86,0x93,0x94,0x9D,0x9A,
0x27,0x20,0x29,0x2E,0x3B,0x3C,0x35,0x32,0x1F,0x18,0x11,0x16,0x03,0x04,0x0D,0x0A,
0x57,0x50,0x59,0x5E,0x4B,0x4C,0x45,0x42,0x6F,0x68,0x61,0x66,0x73,0x74,0x7D,0x7A,
0x89,0x8E,0x87,0x80,0x95,0x92,0x9B,0x9C,0xB1,0xB6,0xBF,0xB8,0xAD,0xAA,0xA3,0xA4,
0xF9,0xFE,0xF7,0xF0,0xE5,0xE2,0xEB,0xEC,0xC1,0xC6,0xCF,0xC8,0xDD,0xDA,0xD3,0xD4,
0x69,0x6E,0x67,0x60,0x75,0x72,0x7B,0x7C,0x51,0x56,0x5F,0x58,0x4D,0x4A,0x43,0x44,
0x19,0x1E,0x17,0x10,0x05,0x02,0x0B,0x0C,0x21,0x26,0x2F,0x28,0x3D,0x3A,0x33,0x34,
0x4E,0x49,0x40,0x47,0x52,0x55,0x5C,0x5B,0x76,0x71,0x78,0x7F,0x6A,0x6D,0x64,0x63,
0x3E,0x39,0x30,0x37,0x22,0x25,0x2C,0x2B,0x06,0x01,0x08,0x0F,0x1A,0x1D,0x14,0x13,
0xAE,0xA9,0xA0,0xA7,0xB2,0xB5,0xBC,0xBB,0x96,0x91,0x98,0x9F,0x8A,0x8D,0x84,0x83,
0xDE,0xD9,0xD0,0xD7,0xC2,0xC5,0xCC,0xCB,0xE6,0xE1,0xE8,0xEF,0xFA,0xFD,0xF4,0xF3
};
/*************************************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: CRC8cal
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: *p<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룻counter<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: CRC8<EFBFBD><EFBFBD>ɢ
*************************************************************************************************/
U8 CRC8cal(U8 *p, U8 counter) //look-up table calculte CRC
{
U8 crc8 = 0;
for( ; counter > 0; counter--)
{
crc8 = CRC8Table[crc8^*p];
p++;
}
return(crc8);
}
/*************************************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: TWICheckStatus
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: Status<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰTWI<EFBFBD><EFBFBD>״̬
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD><EFBFBD><EFBFBD>TWI<EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*************************************************************************************************/
BOOL TWICheckStatus(U8 Status)
{
BOOL Result = 1;
U16 timeoutcount = 48000; //Ӳ<><D3B2>IICʱtimeoutcount<6E><74><EFBFBD><EFBFBD>100<30><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨѶ<CDA8><D1B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IIC<49><43><EFBFBD>鱣<EFBFBD><E9B1A3>ԭֵ <20><><EFBFBD><EFBFBD>׼DEMO<4D>壩
while((TWICON&0x08)==0) //<2F>ȴ<EFBFBD>TWIͨѶ<CDA8><D1B6><EFBFBD><EFBFBD>
{
McuWDTClear(); //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ź<EFBFBD>
if(timeoutcount)
{
timeoutcount--;
}
else
{
break;
}
}
if((TWISTA&0xf8) != Status)
{
Result = 0; //Error
}
return Result;
}
/*************************************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: TwiWrite
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: SlaveID: Slave ID
WrAddr: д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ
AddrType<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ȣ<EFBFBD>0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ1Byte<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ2Bytes
Length<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><EFBFBD>ȣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>CRC<EFBFBD>ֽڣ<EFBFBD>
CrcFlg<EFBFBD><EFBFBD> TwiͨѶ<EFBFBD>Ƿ<EFBFBD>֧<EFBFBD><EFBFBD>CRCУ<EFBFBD>飬0<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC
*WrBuf<EFBFBD><EFBFBD> д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD>ŵ<EFBFBD>ַ
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: Twiд<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD>AFE<EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD><EFBFBD><EFBFBD>RTC<EFBFBD><EFBFBD>EEPROM<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ2Bytes<EFBFBD><EFBFBD>
*************************************************************************************************/
BOOL TwiWrite(U8 SlaveID, U16 WrAddr, U8 AddrType, U8 Length, U8 CrcFlg, U8 xdata *WrBuf)
{
U8 i;
U8 TempBuf[4];
BOOL Result = 1;
U16 timeoutcount = 48000;
TempBuf[0] = SlaveID;
TempBuf[1] = (U8)WrAddr;
TempBuf[2] = *WrBuf;
TempBuf[3] = CRC8cal(TempBuf, 3);
if(Length > 0)
{
HTimeoutChk();
TWICON = 0x60; //Start
if((!TWICheckStatus(0x08))&&(!TWICheckStatus(0x10)))
{
Result = 0;
goto WrErr;
}
TWIDAT = SlaveID; //Slave<76><65>ַ
TWICON = 0x40;
if(!TWICheckStatus(0x18))
{
Result = 0;
goto WrErr;
}
if(AddrType == TWI_ADDR_2B)
{
TWIDAT = (U8)(WrAddr>>8); //д<>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽڵ<D6BD>ַ-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>EEPROM
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto WrErr;
}
}
TWIDAT = (U8)WrAddr; //д<>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD>ַ
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto WrErr;
}
if(CrcFlg == TWI_CRC_YES) //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>дAFE<46>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̶<EFBFBD>дһ<D0B4><D2BB><EFBFBD>ֽ<EFBFBD>+CRC
{
TWIDAT = *WrBuf; //Write Data
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto WrErr;
}
TWIDAT = TempBuf[3]; //Write CRC
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto WrErr;
}
}
else //дEEPROM<4F><4D>RTC
{
for(i=0; i<Length; i++)
{
TWIDAT = *WrBuf;
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto WrErr;
}
WrBuf++;
}
}
WrErr:
TWICON = 0x50;
while((TWICON&0x10)!=0)
{
McuWDTClear(); //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ź<EFBFBD>
if(timeoutcount)
{
timeoutcount--;
}
else
{
break;
}
}
}
return Result;
}
/*************************************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: TwiRead
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: SlaveID: Slave ID
RdAddr: <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ַ
AddrType<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ȣ<EFBFBD>0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ1Byte<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ2Bytes
Length<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><EFBFBD>ȣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>CRC<EFBFBD>ֽڣ<EFBFBD>
CrcFlg<EFBFBD><EFBFBD> TwiͨѶ<EFBFBD>Ƿ<EFBFBD>֧<EFBFBD><EFBFBD>CRCУ<EFBFBD>飬0<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC
*RdBuf<EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD>ŵ<EFBFBD>ַ
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: Twi<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡAFE<EFBFBD><EFBFBD>֧<EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD><EFBFBD><EFBFBD>RTC<EFBFBD><EFBFBD>EEPROM<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ2Bytes<EFBFBD><EFBFBD>
*************************************************************************************************/
BOOL TwiRead(U8 SlaveID, U16 RdAddr, U8 AddrType, U8 Length, U8 CrcFlg, U8 xdata *RdBuf)
{
BOOL Result = 1;
U8 i;
U8 xdata TempBuf[46]; //AFEһ<45><D2BB><EFBFBD>Զ<EFBFBD>ȡ2Bytes+CRC
U8 RdCrc = 0;
U16 timeoutcount = 48000;
TempBuf[0] = SlaveID; //<2F><><EFBFBD>浽TempBuf<75><66><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>Ϊ<EFBFBD>˼<EFBFBD><CBBC><EFBFBD>CRC<52><43><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>AFE<46><45>ȡ
TempBuf[1] = (U8)RdAddr;
//TempBuf[2] = Length;
TempBuf[2] = SlaveID | 0x01;
if(Length > 0)
{
HTimeoutChk();
TWICON = 0x60; //Start
if((!TWICheckStatus(0x08))&&(!TWICheckStatus(0x10)))
{
Result = 0;
goto RdErr;
}
TWIDAT = SlaveID; //<2F><><EFBFBD><EFBFBD>Slaveд<65><D0B4>ַ
TWICON = 0x40;
if(!TWICheckStatus(0x18))
{
Result = 0;
goto RdErr;
}
if(AddrType == TWI_ADDR_2B) //<2F><>ַΪ2Bytes
{
TWIDAT = (U8)(RdAddr>>8); //<2F><><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽڵ<D6BD>ַ-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>EEPROM
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto RdErr;
}
}
TWIDAT = (U8)RdAddr; //<2F><><EFBFBD>ͼĴ<CDBC><C4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽڵ<D6BD>ַ
TWICON = 0x40;
if(!TWICheckStatus(0x28))
{
Result = 0;
goto RdErr;
}
// if(SlaveID != AFE_ID)
// {
// TWIDAT = Length; //<2F><><EFBFBD>Ͷ<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ݳ<EFBFBD><DDB3><EFBFBD>
// TWICON = 0x40;
// if(!TWICheckStatus(0x28))
// {
// Result = 0;
// goto RdErr;
// }
// }
TWICON = 0x60; //<2F><><EFBFBD><EFBFBD>RStart
if((!TWICheckStatus(0x08))&&(!TWICheckStatus(0x10)))
{
Result = 0;
goto RdErr;
}
TWIDAT = SlaveID|0x01; //<2F><><EFBFBD><EFBFBD>Slave<76><65><EFBFBD><EFBFBD>ַ
TWICON = 0x40;
if(!TWICheckStatus(0x40))
{
Result = 0;
goto RdErr;
}
for(i=0; i<Length; i++)
{
if((CrcFlg == TWI_CRC_NO)) //<2F><>֧<EFBFBD><D6A7>CRC
{
if(i == Length-1)
{
TWICON = 0x40; //<2F><><EFBFBD><EFBFBD>NACK<43><4B><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>ζ<EFBFBD>
TWICheckStatus(0x58);
}
else
{
TWICON = 0x44; //<2F><><EFBFBD><EFBFBD>ACK<43><4B><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
TWICheckStatus(0x50);
}
*RdBuf = TWIDAT;
RdBuf++;
}
else //֧<><D6A7>CRC<52>ģ<EFBFBD><C4A3>ֽ<EFBFBD><D6BD><EFBFBD><EFBFBD>ݷ<EFBFBD><DDB7><EFBFBD><EFBFBD><EFBFBD>ʱBuf
{
TWICON = 0x44; //ACK
TWICheckStatus(0x50);
TempBuf[3+i] = TWIDAT;
}
}
if(CrcFlg == TWI_CRC_YES)
{
TWICON = 0x40; //No ACK
TWICheckStatus(0x58);
RdCrc = TWIDAT;
if(RdCrc == CRC8cal(TempBuf, 3+Length))
{
for(i=0; i<Length; i++)
{
*RdBuf = TempBuf[3+i];
RdBuf++;
}
}
else
{
Result = 0;
goto RdErr;
}
}
RdErr:
TWICON = 0x50; //TWI Stop
while((TWICON&0x10)!=0)
{
McuWDTClear(); //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ź<EFBFBD>
if(timeoutcount)
{
timeoutcount--;
}
else
{
break;
}
}
}
return Result;
}
/*************************************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: TwiInit
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: FreqKHz: <EFBFBD><EFBFBD><EFBFBD><EFBFBD>TWIͨѶƵ<EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>TWI<EFBFBD><EFBFBD>ӳ<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD>ͨѶƵ<EFBFBD>ʵ<EFBFBD>
//*************************************************************************************************/
//void TwiInit(void)
//{
// TWICR = 0x32; //Ĭ<><C4AC><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD>SCL--P0.5<EFBFBD><EFBFBD>SDA--P0.4
// TWITOUT = 0x00; //<2F>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>裬<EFBFBD><E8A3AC>оƬ<D0BE>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9>
// TWIBR = (24000/TWI_FREQ_KHz-16)/2/1; //<2F><><EFBFBD>÷<EFBFBD><C3B7>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD>ֹ<EFBFBD><D6B9><EFBFBD>߳<EFBFBD>ʱ<EFBFBD>жϣ<D0B6>f=fsys/(16+2*CR*TWIBR)=24MHz/(16+2*16*TWIBR)=**KHz
// TWISTA = 0x06; //16<31><36>Ƶ
// TWICON = 0x40; //ENTWI <20><><EFBFBD><EFBFBD>ֹ<EFBFBD>ߵ<EFBFBD>ƽ<EFBFBD><C6BD>ʱ
// TWTFREE = 0xff; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
// TWIDAT = 0x00;
//}
void TwiInit(void)
{
TWICR = 0x32; //Ĭ<><C4AC><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD>SCL--P0.5<EFBFBD><EFBFBD>SDA--P0.4
TWITOUT = 0x00; //<2F>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>裬<EFBFBD><E8A3AC>оƬ<D0BE>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9>
TWISTA = 0x00;
TWIBR = (8000/TWI_FREQ_KHz-16)/2/1; //<2F><><EFBFBD>÷<EFBFBD><C3B7>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD>ֹ<EFBFBD><D6B9><EFBFBD>߳<EFBFBD>ʱ<EFBFBD>жϣ<D0B6>f=fsys/(16+2*CR*TWIBR)=24MHz/(16+2*16*TWIBR)=**KHz
TWISTA = 0x02; //16<31><36>Ƶ
// #if ((TWI_FREQ_KHz >= 10)&&(TWI_FREQ_KHz <= 400))
// {
// #if TWIBR1 < 256
// TWIBR = TWIBR1;
// TWISTA |= 0x06;
// #elif TWIBR2 < 256
// TWIBR = TWIBR2;
// TWISTA |= 0x04;
// #elif TWIBR3 < 256
// TWIBR = TWIBR3;
// TWISTA |= 0x02;
// #elif TWIBR4 < 256
// TWIBR = TWIBR4;
// TWISTA |= 0x00;
// #endif
// }
// #else
// {
// #error: "Please enter a number(TWI_FREQ_KHz) from 10 to 400!";
// }
//
// #endif
TWICON = 0x40; //ENTWI <20><><EFBFBD><EFBFBD>ֹ<EFBFBD>ߵ<EFBFBD>ƽ<EFBFBD><C6BD>ʱ
TWTFREE = 0xff; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
TWIDAT = 0x00;
}
//void TwiInit(void)
//{
// U16 i,k;
// U8 j;
// TWICR = 0x32; //Ĭ<><C4AC><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD>SCL--P0.5<EFBFBD><EFBFBD>SDA--P0.4
// TWITOUT = 0x00; //<2F>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>裬<EFBFBD><E8A3AC>оƬ<D0BE>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9>
// i = (24000/TWI_FREQ_KHz-16)/2; //<2F><><EFBFBD>÷<EFBFBD><C3B7>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD>ֹ<EFBFBD><D6B9><EFBFBD>߳<EFBFBD>ʱ<EFBFBD>жϣ<D0B6>f=fsys/(16+2*CR*TWIBR)=24MHz/(16+2*16*TWIBR)=**KHz
// for(j=1;j<4;j++)
// {
// k =1<<(2*j-2);
// if(i / k <= 255)
// {
// TWIBR = i / k;
// switch (j)
// {
// case 1:
// TWISTA = 0x00;
// break;
//
// case 2:
// TWISTA = 0x02;
// break;
//
// case 3:
// TWISTA = 0x04;
// break;
//
// case 4:
// TWISTA = 0x06;
// break;
// }
// goto loop;
// }
// }
//loop:
//// TWISTA = 0x06; //16<31><36>Ƶ
// TWICON = 0x40; //ENTWI <20><><EFBFBD><EFBFBD>ֹ<EFBFBD>ߵ<EFBFBD>ƽ<EFBFBD><C6BD>ʱ
// TWTFREE = 0xff; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
// TWIDAT = 0x00;
//}
#endif