📄 modbus.c
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SBUF1 = the_char; // transmit it
}
else
{
TX1_Ready = 1; // indicate ready for next TX
TX1_index=0;
RE485=0;
}
}
}
//定时器0初始化
void Timer0_Init (void)
{
TMOD |=0X01;
TH0=0XB8;
TL0=0X00;
ET0=1;
}
//---------------------------------------------------------------------------------------
//定时器T0溢出中断处理子程序
void Timer0_ISR(void) interrupt 1
{
tend=temp;
if(time>=tend)
{
TL0=0X00; //11.0592MHZ T0低8位初值：定时10ms
TH0=0XB8; //T0高8位初值
TR0=0; //终止定时器T0
sendinterval=1;
time=0;
}
else
{
TL0=0X00; //T0低8位初值：定时50ms
TH0=0XB8; //T0高8位初值
time=time+1;
sendinterval=0;
}
}
//---------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1.
//
void UART0_Init (void)
{
SCON0 = 0x50; // SCON0: mode 1, 8-bit UART, enable RX
TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit reload
TH1 = 0x6F; // set Timer1 reload value for baudrate
CKCON |= 0x10; // Timer1 uses SYSCLK as time base
PCON |= 0x90; // SMOD0 = 1
ES0 = 1; // enable UART0 interrupts
TI0 = 0; // Indicate TX0 ready
TR1 = 1; // start Timer1
TX0_Ready = 1; // indicate TX ready for transmit
RX0_Ready = 0; // indicate RX string not ready
TX0_ptr = NULL;
}
void UART0_ISR (void) interrupt 4
{
static unsigned int TX0_index = 0; // send buffer index
unsigned char the_char0;
if (RI0 == 1)
{
RI0 = 0;
if (RX0_Ready == 0) //可以接收
{ the_char0 = SBUF0; // check to see if message pending
if(RX0_index >=RX0_LENGTH)
{
if (the_char0 == RX0_END) //是结束符
{
RX0_Buf[RX0_index] = the_char0; // NULL-terminate message
RX0_Ready = 1; // post message ready
RX0_index = 0; // reset RX message index
}
else //不是结束符
{
RX0_Ready =0; // post message ready
RX0_index = 0; // reset RX message index
}
}
else
{
if(RX0_index==0)
{
if (the_char0 == RX0_START) //是起始符
{
RX0_Buf[RX0_index] = the_char0;
RX0_index++;
//RECEIVENUM1=2;
}
else //不是起始符
{
RX0_Ready =0;
RX0_index = 0;
//RECEIVENUM1=1;
}
}
else
{
if (the_char0 == RX0_END) //是结束符
{
RX0_Buf[RX0_index] = the_char0; // NULL-terminate message
RX0_Ready = 1; // post message ready
RX0_index = 0; // reset RX message index
}
else //不是结束符
{
RX0_Buf[RX0_index] = the_char0;
RX0_index++;
//RECEIVENUM1++;
}
}
}
}
else
{
; // ignore character -- previous message has not been processed
}
}
else if (TI0 == 1)
{
TI0 = 0; // clear TX complete indicator
the_char0 = *TX0_ptr; // read next character in string
if(TX0_index<SENDNUM0)
{
TX0_ptr++;
TX0_index++; // get ready for next character
SBUF0 = the_char0; // transmit it
}
else
{
TX0_Ready = 1; // indicate ready for next TX
TX0_index=0;
}
}
}
//------------------------------------------------------------------------------------
//RX0_BufClear()
//-----------------------------------------------------------------------------------
void RX0_BufClear(void)
{
unsigned char m;
for(m=0;m<5;m++)
{
RX0_Buf[m]=0x00;
}
}
//-------------------------------------------------------------------------------------
//写FLASH
//-------------------------------------------------------------------------------------
void FlashWrite(unsigned char xdata *pwrite,unsigned char *BufFrom)
{
unsigned char i;
WDTCN = 0xde; // disable watchdog timer
WDTCN = 0xad;
EA=0;
FLSCL |= 0x01; // Enable FLASH writes/erases
PSCTL |= 0x03; // set PSWE = PSEE = 1
PSCTL |= 0x04; // set SFLE = 1 (enable
// access to scratchpad)
*pwrite = 0x00; // erase SCRATCH PAGE 该页被擦除
PSCTL &= ~0x07; // set PSWE = PSEE = SLFE = 0
PSCTL |= 0x01; // set PSWE = 1 写FLASH允许
for(i=0;i<2;i++)
{
PSCTL |= 0x04; // set SFLE to enable FLASH writes
// to Scratch Pad memory
*pwrite++=*BufFrom++;
PSCTL &= ~0x04; // set SFLE to enable FLASH writes
// to Scratch Pad memory
}
PSCTL &= ~0x07; // set PSWE = PSEE = SFLE = 0
FLSCL &= ~0x01; // clear FLWE to disable FLASH
// write/erases
EA=1;
}
//--------------------------------------------------------------------------------------
//读FLASH
//--------------------------------------------------------------------------------------
void FlashRead(unsigned char code *pread,unsigned char *BufTo)
{
unsigned char i;
for(i=0;i<2;i++)
{
PSCTL |= 0x04; // set SFLE to enable FLASH writes
// to Scratch Pad memory
BufTo[i]=*pread;
pread++;
PSCTL &= ~0x04; // clear SFLE to disable access
// to Scratch Pad memory
}
}
//-------------------------------------------------------------------------------------
//向总控中心发送传感器地址
//-------------------------------------------------------------------------------------
void SendCgqAddr(void)
{
unsigned char sendaddr[5];
sendaddr[0]=0x7e;
sendaddr[1]=0xe0;
sendaddr[2]=raddr[0];
sendaddr[3]=raddr[1];
sendaddr[4]=0x0d;
while (!TX0_Ready) ; // wait for transmitter to be available
TX0_Ready = 0; // claim transmitter
TX0_ptr = sendaddr; // set TX buffer pointer to point to
// received message
SENDNUM0=5;
TI0 = 1;
}
//--------------------------------------------------------------------------------------
//RX1_BufClear(void)
//--------------------------------------------------------------------------------------
void RX1_BufClear(void)
{
unsigned char m;
for(m=0;m<64;m++)
{
RX1_Buf[m]=0x00;
}
}
//---------------------------------------------------------------------------------------
//定时器T2初始化子程序
//---------------------------------------------------------------------------------------
void Timer2_Init(void)
{
TH2=0XB8;
TL2=0X00;
T2CON |=0X00; //T2定时器方式1,自动重装载
ET2=1; //定时器T2允许中断
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//---------------------------------------------------------------------------------------
//定时器T2溢出中断处理子程序
//---------------------------------------------------------------------------------------
void Timer2_ISR(void) interrupt 5
{
TF2=0; /*定时器T2溢出标志零*/
tend2=temp2;
if(time2>=tend2)
{
TR2=0; //终止定时器T0
sendinterva2=1;
time2=0;
}
else
{
time2=time2+1;
sendinterva2=0;
}
}
//--------------------------------------------------------------------------------------------
//modubus串口通过485向传感器发送命令子程序，addr为传感器地址
//--------------------------------------------------------------------------------------------
void modbuscgqsend(unsigned char addr)
{
unsigned char Cd[6];
unsigned char SendCd[8];
unsigned int c,crc=0xFFFF;
unsigned char i,j,temp;
Cd[0]=addr;
Cd[1]=0x03;
Cd[2]=0x00;
Cd[3]=0x00;
Cd[4]=0x00;
Cd[5]=0X02;
for (i=0;i<6;i++)
{
c=Cd[i] & 0x00FF;
crc^=c;
for(j=0;j<8;j++)
{
if (crc & 0x0001)
{
crc>>=1;
crc^=0xA001;
}
else
{
crc>>=1;
}
}
}
temp=crc & 0x00ff;
SendCd[6]=temp;
crc>>=8;
temp=crc & 0x00ff;
SendCd[7]=temp;
SendCd[0]=Cd[0];
SendCd[1]=Cd[1];
SendCd[2]=Cd[2];
SendCd[3]=Cd[3];
SendCd[4]=Cd[4];
SendCd[5]=Cd[5];
while (!TX1_Ready); // wait for TX ready
TX1_Ready = 0; // claim transmitter
TX1_ptr = SendCd; // set buffer pointer
SENDNUM1=8;
RE485=1;
SCON1 |= 0x02; // TI1 = 1; start transmit
}
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