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Wat gaan we doen?

Wat gaan we doen?. Herhaling: ACPS; indexed addressing; half-word/byte Nieuw: - CMP, CMN - format 2 nd argument (operand 2) direct aansturen van I/O pinnen (programmed I/O) oefening: taa-tuu taa-tuu taa-tuu. ACPS = ARM Procedure Call Standard R0 – R3 : function arguments

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Wat gaan we doen?

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  1. Wat gaan we doen? • Herhaling: ACPS; indexed addressing; half-word/byte • Nieuw: - CMP, CMN - format 2nd argument (operand 2) • direct aansturen van I/O pinnen (programmed I/O) • oefening: taa-tuu taa-tuu taa-tuu

  2. ACPS = ARM Procedure Call Standard R0 – R3 : function arguments R0 (R1, R2, R3) : function result R4 - R8 : local scratch R9 : afblijven R10-11 : local scratch R13 : SP R14 : LR R15 : PC R0 – R3 are *not* preserved R4-R8, R10-R11 *are* preserved (boek p175-180)

  3. Herhaling LDR R0, [ R1 ] LDR R0, [ R1 ], #4 LDR R0, [ R1, #4 ] LDR R0, [ R1, #4 ] ! LDRH R0, [ R1 ] LDRB R0, [ R1 ]

  4. (herhaling) LDR R0, [ R1 ] registers geheugen

  5. (herhaling) LDR R0, [ R1 ], #4 + 0000 0008 registers geheugen

  6. (herhaling) LDRH R0, [ R1, #4 ] + 0000 0008 registers geheugen

  7. (herhaling) LDRB R0, [ R1, #4 ] ! + 0000 0008 registers geheugen

  8. CMP, CMN CMP R1, R2 CMP R1, #15 CMN R1, R2 CMN R1, #10 • boek p52 bovenaan + 5.7

  9. CMP R2, R1 - flags registers geheugen

  10. CMN R1, #15 - - flags registers geheugen

  11. Operand 2 MOV R0, R1 ADD R0, R1, #2 SUBC R0, R1, R2, LSL #5 ADDS R1, R2, R3, ASR R4 • boek p52..53 + 5.7

  12. programmed I/O • LPC2148 architectuur • I/O pin function selection • I/O pin direction selection • I/O pin manipulation

  13. User Manual P.7

  14. User Manual P.8

  15. LDR R0,=0 LDR R1,=SCS STR R0,[R1] User Manual P.26

  16. User Manual P.75

  17. User Manual P.76

  18. User Manual P.82

  19. User Manual P.82

  20. /* General Purpose IO 0 */ IO0PIN = 0xe0028000 IO0SET = 0xe0028004 IO0DIR = 0xe0028008 IO0CLR = 0xe002800c /* General Purpose IO 1 */ IO1PIN = 0xe0028010 IO1SET = 0xe0028014 IO1DIR = 0xe0028018 IO1CLR = 0xe002801c /* Pin Connect Block */ PINSEL0 = 0xe002c000 PINSEL1 = 0xe002c004 File (part of): lpc214x.inc Use: #include ”lpc214x.inc”

  21. /* General Purpose IO 0 */ #define IO0PIN (*(volatile unsigned int *)(0xe0028000)) #define IO0SET (*(volatile unsigned int *)(0xe0028004)) #define IO0DIR (*(volatile unsigned int *)(0xe0028008)) #define IO0CLR (*(volatile unsigned int *)(0xe002800c)) /* General Purpose IO 1 */ #define IO1PIN (*(volatile unsigned int *)(0xe0028010)) #define IO1SET (*(volatile unsigned int *)(0xe0028014)) #define IO1DIR (*(volatile unsigned int *)(0xe0028018)) #define IO1CLR (*(volatile unsigned int *)(0xe002801c)) /* Pin Connect Block */ #define PINSEL0 (*(volatile unsigned int *)(0xe002c000)) #define PINSEL1 (*(volatile unsigned int *)(0xe002c004)) File (part of): lpc214x.h

  22. (dit is code voor een LPC2106)

  23. (dit is code voor een LPC2106)

  24. Opdracht (1) Schrijf de subroutines (hou je aan de APCS!): LspInit - geen parameters - maakt de LSP pin een GPIO en output - blijft van de andere pinnen af! LspHigh - geen parameters - neemt aan dat LspInit al is aangeroepen - maakt de LSP pin hoog LspLow - geen parameters - neemt aan dat LspInit al is aangeroepen - maakt de LSP pin laag

  25. Opdracht (2) Schrijf de subroutines (hou je aan de APCS!): LspBeep - R0 = duur van 1 periode in µs - R1 = aantal perioden - gebruikt LspHigh en LspLow Test deze functies door programma te schrijven dat (in een eeuwigdurende lus) het volgende doet: • ‘Piep’ gedurende 1 seconde op 440 Hz • 0.1 seconde stilte • ‘Piep’ gedurende 1 seconde op 880 Hz • 0.5 seconde stilte Ga uit van de blink.zip als startpunt; gebruik #include ”lpc2148.h”

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