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/Designs/Measuring_instruments/LCTmetr01A/SW/lib/TM.C |
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//////////////////////////////////////////////////////////////////////////// |
// |
// KNIHOVNA PRO PRACI S TOUCH MEMORY FY DALLAS |
// |
//////////////////////////////////////////////////////////////////////////// |
// |
// PEFI S.ICZ a.s. 2002, 2003 |
// |
// Verze 1.0 |
// 1.1 - pridana podpora vypinani pullupu |
// pres pin TOUCH_PULLUP_PIN |
// 1.2 - vyrazena podpora pullupu, do obecne knihovny nepatri |
// - funkce checkCRC se stala soucasti fce read_sn |
// - upraveny nazvy funkci, zpetna kompatibilita neni potreba |
// 1.3 - pridana samostatna funkce pro kontrolu CRC |
// |
/////////////////////////////////////////////////////////////////////////// |
// |
// funkce: |
// int8 TM_present() |
// - vraci TRUE, pokud je TM pritomna |
// |
// int8 TM_read_byte() |
// - precte bajt z TM |
// |
// int8 TM_write_byte(int8 data) |
// - zapise bajt do TM a vraci TRUE, pokud se to povedlo |
// |
// int8 TM_read_sn(int8 *sn) |
// - precte seriove cislo z TM pomoci prikazu 0x33 |
// - vraci TRUE, pokud je SN platne (spravne CRC) |
// |
// definice a prepinace |
// #define TM_PIN /* pin, na kterem je touch memory pripojena */ |
// #bit TM_PIN_BIT /* totez, ale definovan jako bit */ |
// |
// |
// defaultni definice |
#ifndef TM_PIN |
#define TM_PIN PIN_B0 |
#bit TM_PIN_BIT = PORTB.0 |
#endif |
/****************************************************************************************************/ |
// Privatni sekce, cist jen v pripade, ze neco nefunguje |
/****************************************************************************************************/ |
// precte bajt z touch memory |
// |
int8 TM_read_byte() { |
int8 i,data; |
for(i=0;i<8;++i) { |
output_low(TM_PIN); |
delay_us(14); |
output_float(TM_PIN); |
delay_us(5); |
shift_right(&data,1,input(TM_PIN)); |
delay_us(100); |
} |
return(data); |
} |
// zapise bajt do touch memory |
// |
int8 TM_write_byte(int8 data) { |
int8 i; |
for(i=0;i<8;++i) { |
output_low(TM_PIN); |
delay_us(10); |
if(shift_right(&data,1,0)) { |
output_float(TM_PIN); |
delay_us(1); // k vuli nabehu jednicky pres pullup |
if(!TM_PIN_BIT) return(0); |
} else { |
output_low(TM_PIN); |
if(TM_PIN_BIT) return(0); // k vuli nabehu nuly |
} |
delay_us(50); |
output_float(TM_PIN); |
// delay_us(50); |
} |
return(TRUE); |
} |
// testuje pritomnost touch memory, pri pritomnosti vraci TRUE |
// |
int8 TM_present() { |
int1 present; |
output_low(TM_PIN); |
delay_us(500); |
output_float(TM_PIN); |
if(!input(TM_PIN)) |
return(FALSE); |
delay_us(65); |
present=!input(TM_PIN); |
delay_us(240); |
if(present) |
return(TRUE); |
else |
return(FALSE); |
} |
// zkontroluje CRC zaznamu, vraci TRUE, pokud je zanam spravny |
// |
int8 TM_check_CRC(unsigned int8 *sn, unsigned int8 num) |
{ |
#ifdef CRC_TAB |
// tabulka pro vypocet CRC |
const int8 TouchCRC[256]= { |
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, |
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, |
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, |
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, |
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, |
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, |
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, |
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, |
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205, |
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80, |
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238, |
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, |
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, |
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, |
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, |
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53}; |
#else |
int8 j,k,l; // promenne potrebne pro algoritmicky vypocet CRC |
#endif |
int8 CRC; // prubezne CRC |
int8 i; |
#ifdef CRC_TAB |
// vypocet CRC tabulkou |
CRC=0; |
for(i=0;i<num;i++) CRC=TouchCRC[CRC ^ *(sn+i)]; |
if(CRC!=*(sn+7)) return(0); |
else return(1); |
#else |
// vypocet CRC algoritmicky |
CRC=0; |
for(i=0 ;i<num;i++) { |
k=*(sn+i); |
#asm |
movlw 8 |
movwf j // citac bitu |
loop: |
movf k,W // presun bajt do W |
xorwf CRC,W // prixoruj CRC a uloz do w |
movwf l |
rrf l,F // naxorovany bit do CY |
movf CRC,W |
btfsc 3.0 // preskoc, je-li CY nulove |
xorlw 0x18 |
movwf CRC |
rrf CRC,F // rotuj CRC |
rrf k // na dalsi bit |
decfsz j,F |
goto loop |
#endasm |
} |
if(CRC!=0) return(0); |
else return(1); |
#endif |
} |
// precte seriove cislo z touch memory, vraci TRUE je-li platne (spravne CRC) |
// |
int8 TM_read_sn(unsigned int8 *sn) |
{ |
int8 i; |
// precteni SN z touch memory |
TM_write_byte(0x33); |
for(i=0;i<8;i++) *(SN+i)=TM_read_byte(); // precti SN do buferu |
if(*sn==0) return(0); // family kod je nulovy a to je chyba, timto nahrazujeme precteni samych nul, coz ma platne CRC, ale neexistuje |
return(TM_check_CRC(SN,8)); |
} |
// End of FIle |
Property changes: |
Added: svn:executable |
+* |
\ No newline at end of property |