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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | service | 1 | |
| 2 | ; configuration bits PIC18F4420 clocked at 40MHz |
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| 3 | ; internal oscillator & RA6 = digital port |
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| 4 | CONFIG OSC = ECIO6 |
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| 5 | CONFIG FCMEN = OFF |
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| 6 | CONFIG IESO = OFF |
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| 7 | CONFIG PWRT = OFF |
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| 8 | CONFIG BOREN = ON, BORV = 3 |
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| 9 | CONFIG WDT = OFF |
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| 10 | CONFIG MCLRE = ON |
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| 11 | CONFIG PBADEN = OFF |
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| 12 | CONFIG LVP = OFF |
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| 13 | CONFIG CCP2MX = PORTC |
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| 14 | CONFIG LPT1OSC = OFF |
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| 15 | CONFIG STVREN = ON |
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| 16 | CONFIG XINST = OFF |
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| 17 | |||
| 18 | ; timer's |
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| 19 | TMR0P8 EQU B'00000010' ; TMR0 stop, prescaler = 8, 16 bit |
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| 20 | |||
| 21 | ; TMR0 count in ms with prescaler = 4 at 40MHz (period 0.8us) |
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| 22 | ; max. count = 52ms |
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| 23 | #define CNTTMR0(count) (0x10000 - ((count * D'1250'))) |
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| 24 | |||
| 25 | TMR0P256 EQU B'00000111' ; TMR0 stop, prescaler = 256, 16 bit |
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| 26 | ; period = 25,6us @ 40Mhz, max. 1678ms |
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| 27 | ; TMR0 count in ms with prescaler = 256 at 40MHz (period 25.6us) |
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| 28 | ; max. count = 1678ms |
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| 29 | #define CNTMSTMR0(count) (0x10000 - ((count * D'1250')) / D'32') |
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| 30 | |||
| 31 | T20MS EQU CNTTMR0(D'20') ; counter 20ms (prescaler = 8) |
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| 32 | T256MS EQU CNTMSTMR0(D'256') ; counter 256ms (prescaler = 256) |
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| 33 | T1670MS EQU CNTMSTMR0(D'1670') ; counter 1670ms (prescaler = 256) |
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| 34 | |||
| 35 | ; equates |
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| 36 | ; host connect command (6 bytes sequence) |
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| 37 | HOST_CONNECT1 EQU 0x87 |
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| 38 | HOST_CONNECT2 EQU 0xE9 |
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| 39 | HOST_CONNECT3 EQU 0x5D |
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| 40 | HOST_CONNECT4 EQU 0x93 |
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| 41 | HOST_CONNECT5 EQU 0xB7 |
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| 42 | HOST_CONNECT6 EQU 0x57 |
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| 43 | |||
| 44 | ; upload from host command (4 bytes: code followed by page & bank count) |
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| 45 | HOST_UPLOAD1 EQU 0x99 |
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| 46 | HOST_UPLOAD2 EQU 0x51 |
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| 47 | |||
| 48 | ; download to host command (4 bytes: code followed by page & bank count) |
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| 49 | HOST_DOWNLOAD1 EQU 0x7D |
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| 50 | HOST_DOWNLOAD2 EQU 0x3B |
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| 51 | |||
| 52 | ; positive response |
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| 53 | DEV_ACK EQU 0xAA |
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| 54 | ; negative response |
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| 55 | DEV_NACK EQU 0x55 |
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| 56 | |||
| 57 | ;---- MACRO's --------------------------------------------------------------- |
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| 58 | ldw macro f ; load W (affect N,Z flags) |
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| 59 | movf f, w |
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| 60 | endm |
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| 61 | |||
| 62 | ldwb macro f ; load W banked (affect N,Z flags) |
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| 63 | movf f, w, BANKED |
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| 64 | endm |
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| 65 | |||
| 66 | ;---- ram variables --------------------------------------------------------- |
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| 67 | ramvars udata_acs 0x000 |
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| 68 | mscnt res 2 ; ms counter for timer 0 |
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| 69 | ndelay res 2 ; delay counter |
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| 70 | pagecnt res 1 ; count of pages |
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| 71 | bankcnt res 1 ; count of banks |
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| 72 | pagecnt2 res 1 ; count of pages |
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| 73 | bankcnt2 res 1 ; count of banks |
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| 74 | madl res 1 ; page address |
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| 75 | madh res 1 ; memory high address |
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| 76 | umdat0 res 1 ; first byte received |
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| 77 | umdat1 res 1 ; 2nd byte received |
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| 78 | umrx res 1 ; flag recieved byte |
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| 79 | extvcc res 1 ; external vcc detected |
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| 80 | ;memext res 1 ; extern memory buffer & access enabled |
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| 81 | loaded res 1 ; memory loaded |
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| 82 | conn res 1 ; connected flag |
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| 83 |