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Les 3 - onderwerpen

Les 3 - onderwerpen. Hints voor ‘delay’ Register file banks Gebruik van het DB037 bord Aftekenen vorige opgaves Twee nieuwe opgaves. Een W * 1 ms delay. int i = W; while( i > 0 ){ i--; Delay_1ms(); }. Een Delay_1ms. 5 MIPS dus 1 ms is 5000 instructies*

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Les 3 - onderwerpen

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  1. Les 3 - onderwerpen • Hints voor ‘delay’ • Register file banks • Gebruik van het DB037 bord • Aftekenen vorige opgaves • Twee nieuwe opgaves Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  2. Een W * 1 ms delay int i = W; while( i > 0 ){ i--; Delay_1ms(); } Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  3. Een Delay_1ms • 5 MIPS dus 1 ms is 5000 instructies* • In 8 bit kan je tot 256 tellen, neem 250 • 1 keer door de lus moet dan 5000 / 250 = 20 instructies zijn Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  4. Een Delay_1ms cblock teller endc movlw D’250’ movwf teller loop: decfsz teller, f goto loop Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  5. Een paar instructies vertraging (1) loop: nop ; 17 NOPs ... nop decfsz teller, f goto loop Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  6. Een paar instructies vertraging (2) nop4: macro nop nop nop nop enmd loop: nop nop4 nop4 nop4 nop4 decfsz teller, f goto loop Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  7. Een paar instructies vertraging (3) cblock teller endc movlw D’250’ movwf teller loop: nop call delay_4 call delay_4 call delay_4 call delay_4 decfsz teller, f goto loop delay_4: return Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  8. Een paar instructies vertraging (4) cblock teller endc movlw D’250’ movwf teller loop: nop call delay_16 decfsz teller, f goto loop delay_16: call delay_4 delay_12: call delay_4 delay_8: call delay_4 delay_4: return Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  9. PIC16F887 memory map Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  10. PIC –register bank selection Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  11. DB037 Contains: • Target chip: PIC16F877 • Programmer: pickit2 clone • Power: from USB (2x), Wall-Wart, NiCad • Peripherals: LSP, LEDs (and much more) Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  12. DB037 8 LEDs Programming connector Programming activity LED Power LED reset Power source (zet de jumper rechts) Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  13. Using DB037 • Get count.zip (from my website) • Unzip to new directory (path!) • Double-click count.mcp • Edit count.asm • Assemble • Correct errors and repeat .... Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  14. an (empty) DB037 program ;================================================================ ; ; count.asm ; ;================================================================ ; initialisation etc for DB037 ; also beeps and activated the LEDs #include <DB037-01.INC> ;================================================================ ; main ;================================================================ ; put your code here ;================================================================ ; end of assembler source ;================================================================ SLEEP END Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  15. DB037-01.INC • Includes the Microchip16F877 include file (register definitions) • Sets the configuration word(s) (oa. 20 MHz crystal, external reset) • ORG 0, CBLOCK H’20’ • PORTx_SHADOW, PORTx_FLUSH (x = A,B,C,D) • WWAIT subroutine • Initialises TRIS (direction) registers • Beeps • Activates LEDS, pattern 0x55 Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  16. DB037-01.INC (1) ;================================================================ ; ; include file for DB037 for a first program ; ; beeps and activates the LEDs with a 0x55 pattern ; ;================================================================ ; select target chip and hex file format LIST p=16f887, f=inhx32 ; include target chip stuff #include <P16F887.INC> Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  17. DB037-01.INC (2) ; configuration settings __config _CONFIG1, 0x20E2 ; -debug, -LVP, -fcmen, -ieso, -boren, ; -cpd, -cp, mclre, pwtre, -wdte, HSosc __config _CONFIG2, 0x3FFF ; nothing special Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  18. DB037-01.INC (3) ; start code at 0 ORG 0 ; start variables at 0x20 CBLOCK H'20' ENDC ; skip subroutines GOTO WContinue Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  19. DB037-01.INC (4) ; =========================================================== ; shadow registers and flush subroutines FLUSH_MACRO MACRO Shadow, Port CBLOCK Shadow ENDC MOVFW Shadow MOVWF Port RETURN ENDM PORTA_FLUSH FLUSH_MACRO PORTA_SHADOW, PORTA PORTB_FLUSH FLUSH_MACRO PORTB_SHADOW, PORTB PORTC_FLUSH FLUSH_MACRO PORTC_SHADOW, PORTC PORTD_FLUSH FLUSH_MACRO PORTD_SHADOW, PORTD PORTE_FLUSH FLUSH_MACRO PORTE_SHADOW, PORTE Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  20. DB037-01.INC (5) ; =========================================================== ; WWAIT WWAIT CBLOCK WWaitCounter ENDC MOVLW 0x00 MOVWF WWaitCounter WWaitLoop CALL WWaitReturn DECFSZ WWaitCounter, f GOTO WWaitLoop WWaitReturn RETURN Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  21. DB037-01.INC (6) WContinue ; =========================================================== ; A0..A2 and D and E0..E2 are outputs BSF STATUS, RP0 MOVLW 0xD8 MOVWF ( 0x80 ^ TRISA ) MOVLW 0x00 MOVWF ( 0x80 ^ TRISD ) MOVLW 0xF8 MOVWF ( 0x80 ^ TRISE ) BCF STATUS, RP0 Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  22. DB037-01.INC (7) ; =========================================================== ; beep CBLOCK WBeepCounter ENDC CLRF WBeepCounter MOVLW H'02' MOVWF PORTE_SHADOW CALL PORTE_FLUSH WBeepLoop BSF PORTA_SHADOW, 1 CALL PORTA_FLUSH CALL WWAIT BCF PORTA_SHADOW, 1 CALL PORTA_FLUSH CALL WWAIT DECFSZ WBeepCounter, f GOTO WBeepLoop Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  23. DB037-01.INC (8) ; =========================================================== ; activate the LEDs MOVLW H'04' MOVWF PORTE_SHADOW CALL PORTE_FLUSH MOVLW H'55' ^ H'FF' MOVWF PORTD_SHADOW CALL PORTD_FLUSH ; the students' application follows ; (in the file that includes this file) Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  24. PICkit 2 V1.20 • Gebruik V1.20 !!! • Device Family > Midrange (14 bit core) Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  25. PICkit 2 V1.20 • Selecteer de .hex file die je in MPLAB hebt aangemaakt: <project name>.HEX Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  26. PICkit 2 V1.20 • Zet target 5.0V aan Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  27. PICkit 2 V1.20 • Zet programmeren van de Data EEPROM (voorlopig) uit Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  28. DB037 bordje – tel op 8 LEDs Main loop: • Tel in een variabele • Copieer die naar PORTD • Wacht 4 ms (gebruik je wacht subroutine) Allokeer je variabelen nu en voortaan op de nette manier (cblock). Hoe snel zal de meest linker LED ongeveer gaan knipperen? Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

  29. DB037 bordje – Kitt Display Maakt een ‘Kitt’ display op de 8 LEDs. (Kitt patroon is: steeds 1 LED aan, de LED die aan is ‘beweegt’ heen-en-weer). NB: 4 ms voor een stap is nu een beetje te snel! Hogeschool Utrecht / Institute for Computer, Communication and Media Technology

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