?? ledtest.c
字號:
docrc16(0x07);
docrc16(0x00);
docrc16(0x0e);
// read and calculate the read crc
docrc16(temp1);
lastcrc16 = docrc16(temp2);
// crc should now be 0xB001
if (lastcrc16 != 0xB001)
{
ow_reset();
tx_str("make PIOA high crc error!");
}
else{
tx_str("make PIOA high crc correct!");
}
tx_lfbs();
/* ow_reset();
write_byte(0xCC); //LSB address
write_byte(0x55); //MSB address
write_byte(0x07); //LSB address
write_byte(0x00); //MSB address
write_byte(0x6d); //
temp1=read_byte();
temp2=read_byte();
// crcbit=read_bit();
setcrc16(0x0000); //
docrc16(0x55);
docrc16(0x07);
docrc16(0x00);
docrc16(0x6d);
// read and calculate the read crc
docrc16(temp1);
lastcrc16 = docrc16(temp2);
// crc should now be 0xB001
if (lastcrc16 != 0xB001)
{
ow_reset();
tx_str("make PIOA low crc error!");
}
else{
tx_str("make PIOA low crc correct!");
}
tx_lfbs();
delay(10000);
ow_reset();
write_byte(0xCC); //LSB address
write_byte(0xaa); //MSB address
write_byte(0x07); //LSB address
write_byte(0x00); //MSB address
test=read_byte(); //LSB address
temp1=read_byte();
temp2=read_byte();
// crcbit=read_bit();
setcrc16(0x0000); //
docrc16(0xaa);
docrc16(0x07);
docrc16(0x00);
docrc16(test);
// read and calculate the read crc
docrc16(temp1);
lastcrc16 = docrc16(temp2);
// crc should now be 0xB001
if (lastcrc16 != 0xB001)
{
ow_reset();
tx_str("read status crc error!");
}
else{
tx_str("read status crc correct!");
}
tx_lfbs();
if (test==0xff)
{
tx_str("read_byte=0xff!");
tx_lfbs();
}
else if(test<=48) {
tx_str("read_byte=");
tx_char((test+48));
tx_lfbs();
}
else { tx_str("read_byte=");
tx_char((test));
tx_lfbs();
}*/
/* break;
case '8':
ow_reset();
write_byte(0xCC); //skip command
write_byte(0x55); //write status command
write_byte(0x07); //LSB address
write_byte(0x00); //MSB address
write_byte(0x6d); //data
temp1=read_byte();
temp2=read_byte();
// crcbit=read_bit();
setcrc16(0x0000); //
docrc16(0x55);
docrc16(0x07);
docrc16(0x00);
docrc16(0x6d);
// read and calculate the read crc
docrc16(temp1);
lastcrc16 = docrc16(temp2);
// crc should now be 0xB001
if (lastcrc16 != 0xB001)
{
ow_reset();
tx_str("make PIOA low(Channel FF = 1 transistor off) crc error!");
}
else{
tx_str("make PIOA low(Channel FF = 1 transistor off) crc correct!");
}
tx_lfbs();
// delay(10000);
break;
default:
tx_str("default break!");
break;
}
}*/
while(1);
}
/*unsigned char rx_char(void)
{
while(!RI)
{;}
RI=0;
return SBUF;
}*/
void tx_str(unsigned char *str)
{int i;
for (i=0;i<strlen(str);i++)
{
tx_char(str[i]);
}
}
void tx_char(unsigned char c)
{
while(!TI)
{
;
}
TI=0;
SBUF=c;
}
void tx_lfbs(void)
{int y;
tx_char(0x0A);
for (y=0;y<70;y++)
{
tx_char(0x08);
}
}
void Led_blink(void)
{
int i;
for(i=0;i<10;i++)
{
P15=1;
delay(200);
P15=0;
delay(200);
}
}
void Init_Rs232(void)
{IE=0X00;
SCON=0x50;
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
TI=1;
}
void delay(int delay)
{int i,j;
for (i=0;i<delay;i++)
for (j=0;j<255;j++);
}
// WRITE_BIT - writes a bit to the one-wire bus, passed in bitval.
//
void write_bit(char bitval)
{
if (bitval==0)
{
writedatalow();
}
else{
writedatahigh();
}
}// Delay provides 16us per loop, plus 24us. Therefore delay(5) = 104us
// WRITE_BYTE - writes a byte to the one-wire bus.
//
/*void writedatalow(void)
{
}
void writedatahigh(void)
{int count=6000;
owData=0;
owRst=0;
wdelay(1);
owData=1;
owRst=1;
owEn=1;
owBsy=1;
wdelay(1);
owEn=0;
while(count!=0)
{
if(
}*/
void write_byte(char val)
{
unsigned char i;
unsigned char temp;
for (i=0; i<8; i++) // writes byte, one bit at a time
{
temp = val>>i; // shifts val right 'i' spaces
temp &= 0x01; // copy that bit to temp
write_bit(temp); // write bit in temp into
}
wdelay(5);
}
unsigned char read_bit(void)
{uchar owireda;
owireda=readowdatabit();
/* if (owireda ==0xff)
{
tx_str("read one bit program error!");
}
if (owireda ==0x00)
{
tx_str("read one bit==0x00!");
}
if (owireda ==0x01)
{
tx_str("read one bit==0x01!");
}
if ((owireda !=0x01)&&(owireda !=0x00)&&(owireda !=0xff))
{
tx_str("read one bit program error !=0x01,0x00,0xff!");
}*/
return(owireda);
}
void wdelay(int us)
{
int s;
for (s=0;s<us;s++);
}
//////////////////////////////////////////////////////////////////////////////
// OW_RESET - performs a reset on the one-wire bus and
// returns the presence detect. Reset is 480us, so delay
// value is (480-24)/16 = 28.5 - we use 29. Presence checked
// another 70us later, so delay is (70-24)/16 = 2.875 - we use 3.
//
/*unsigned char ow_reset(void)
{
unsigned char presence;
owData = 0; //pull DQ line low
wdelay(29); // leave it low for 480us
owData = 1; // allow line to return high
wdelay(3); // wait for presence
presence = owData; // get presence signal
wdelay(25); // wait for end of timeslot
return(presence); // presence signal returned
} // 0=presence, 1 = no part*/
//////////////////////////////////////////////////////////////////////////////
// READ_BYTE - reads a byte from the one-wire bus.
//
unsigned char read_byte(void)
{
unsigned char i;
unsigned char value = 0;
for (i=0;i<8;i++)
{
if(read_bit()) value|=0x01<<i; // reads byte in, one byte at a time and then
// shifts it left
wdelay(6); // wait for rest of timeslot
}
return(value);
}
unsigned char First(uchar conditional)
{int flag;
unsigned char g; // Output bit
unsigned char x = 0;
unsigned char m = 1; // ROM Bit index
unsigned char n = 0; // ROM Byte index
unsigned char k = 1; // bit mask
unsigned char discrepMarker = 0; // discrepancy marker
unsigned char nxt; // return value
LastDeviceFlag = FALSE;
LastDiscrepancy = 0;
nxt = FALSE; // set the next flag to false
crc8=0;
flag = ow_reset();
if(flag||LastDeviceFlag) // no parts -> return false
{
LastDiscrepancy = 0; // reset the search
return FALSE;
}
if (conditional)
{ write_byte(0xec);
}
else{
write_byte(0xF0);
}
do
// for all eight bytes
{
x = 0;
/* if(read_bit==0xff)
{
tx_str("read one bit program error!");
}*/
if(read_bit()==1)
{
x = 2;
// tx_str(" first bit=1!");
// tx_lfbs();
}
wdelay(6);
if(read_bit()==1)
{x |= 1; // and its complement
// tx_str(" next bit=1!");
//tx_lfbs();
}
if(x ==3) // there are no devices on the 1-wire
{
tx_str(" not find slave device!");
tx_lfbs();
break;
}
else
{
if(x>0) // all devices coupled have 0 or 1
g = x>>1; // bit write value for search
else
{
// if this discrepancy is before the last
// discrepancy on a previous Next then pick
// the same as last time
if(m<LastDiscrepancy)
{
g = ((ROM_NO[n]&k)>0);
}
else // if equal to last pick 1
{
g = (m==LastDiscrepancy); // if not then pick 0
}
// if 0 was picked then record
// position with mask k
if (g==0) discrepMarker = m;
}
if(g==1) // isolate bit in ROM[n] with mask k
ROM_NO[n] |= k;
else
ROM_NO[n] &= ~k;
write_bit(g); // ROM search write
m++; // increment bit counter m
k = k<<1; // and shift the bit mask k
if(k==0) // if the mask is 0 then go to new ROM
{ // byte n and reset mask
crc8=docrc8(ROM_NO[n],crc8); // accumulate the CRC
n++; k++;
}
}
}while(n<8); //loop until through all ROM bytes 0-7
if(m<65||crc8) // if search was unsuccessful then
LastDiscrepancy=0; // reset the last discrepancy to 0
else
{
// search was successful, so set lastDiscrep,
// lastOne, nxt
LastDiscrepancy = discrepMarker;
LastDeviceFlag = (LastDiscrepancy==0);
nxt = TRUE; // indicates search is not complete yet, more
tx_str("Find Device!");
tx_lfbs();
// parts remain
}
return nxt;
}
// Perform Match ROM
//
unsigned char Send_MatchRom(void)
{
unsigned char i;
if(ow_reset())
{
tx_str("owire reset failure!");
return FALSE;
}
write_byte(0x55); // match ROM command
for(i=0;i<8;i++)
{
write_byte(ROM_NO[i]); //send ROM code
}
return TRUE;
}
//--------------------------------------------------------------------------
// Reset crc16 to the value passed in
//
// 'reset' - data to set crc16 to.
//
void setcrc16(ushort reset)
{
utilcrc16 = reset;
return;
}
//--------------------------------------------------------------------------
// Calculate a new CRC16 from the input data short. Return the current
// CRC16 and also update the global variable CRC16.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
// indicate the symbolic port number.
// 'data' - data to perform a CRC16 on
//
// Returns: the current CRC16
//
ushort docrc16(ushort cdata)
{
cdata = (cdata ^ (utilcrc16 & 0xff)) & 0xff;
utilcrc16 >>= 8;
if (oddparity[cdata & 0xf] ^ oddparity[cdata >> 4])
utilcrc16 ^= 0xc001;
cdata <<= 6;
utilcrc16 ^= cdata;
cdata <<= 1;
utilcrc16 ^= cdata;
return utilcrc16;
}
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