No changes between revisions
| /Designs/LCTmetr01A/SW/lib/TM.C |
|---|
| 0,0 → 1,189 |
| //////////////////////////////////////////////////////////////////////////// |
| // |
| // 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 |