1BI QUC BO

LP TRNH H THNG NHNG

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Vi iu khin 8051

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Vi iu khin 8051

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Phn mm

KEIL

PROTEUS

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Cu trc b nh ca 8051

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Cu trc b nh ca 8051

8051 c 3 vng nh ring bit (b nhchng trnh, b nh d liu trong, bnh d liu ngoi). Mi vng nh ctruy cp bng cc cu lnh khc nhau.

Khi khai bo cc bin, ta phi xc nhvng nh cho cc bin .

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Cu trc b nh ca ARM7 LPC2000

Cc vi x l c kin trc Von-Newman (VD: ARM) dngchung 1 khng gian nh chob nh chng trnh v dliu.

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Khng gian b nh chng trnh

c gi l code space Cha chng trnh v cc hng s VD: khai bo hng s cha bnh phng

cc s t 0 n 3:code char square[4] = {0,1,4,9};

Lnh assembly: MOVC A, @A+DPTR

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Khng gian b nh d liu ni

Vng nh ni truy xut trc tip (00H-7FH) c khiu l data Lnh assembly: MOV A, 7FH

Vng nh ni truy xut gin tip (00H-FFH), c khiu idata Lnh assembly:

MOV R0, #80H MOV A, @R0

Hai vng nh ny dng cha cc bin thngdng v bin tm

VD: khai bo mt bin integer: idata unsigned int temp;

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Khng gian b nh d liu ngoi

c gi l external data space (xdata)

Lnh assembly: MOV DPTR, #2000H

MOVX A,@DPTR

Cha cc bin t dng, cc khi d liu lnhoc ngoi vi theo kiu memory-mapped

VD: xdata unsigned int[1000] ADC_value;

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VD:

Vit hm c prototype nh sau:

unsigned int checksum (unsigned int

start, unsigned int end)

tnh checksum ca vng nhch*+ng trnh t a ch start n end (code)

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unsigned int checksum (unsigned int start, unsigned int end) { unsigned int code *codeptr, *codeend; unsigned int data checksum = 0;

codeptr = (unsigned int code *)start; codeend = (unsigned int code *)end;

while (codeptr

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Ki float v double

Trong C51, kiu float v double gingnhau, gm 4 byte theo chun EEE-754

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Cc kiu c bit ca C51

0 to 65,535 216sf16

0 to 25518sfr

0 or 11sbit

0 or 11bit

RangeBytesBitsType

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Thanh ghi

Keil cho php khai bo cc thanh ghibng t kha sfr

VD: sfr P0 = 0x80; //khai bo thanh ghi P0

//a ch 80H

P0 = 0x0F;

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Tc ng n bit trong SFR

8051 c cc lnh tc ng n bit. tc ng n bit trong thanh ghi ta dngkhai bo sbit

sbit name = sfr-name ^ bit-position;

sbit name = sfr-address ^ bit-position; sbit name = sbit-address;

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Tc ng n bit trong SFR

sfr PSW = 0xD0;

sbit CY = PSW^7;

sbit CY = 0xD0^7;

sbit CY = 0xD7;

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Tc ng n bit trong SFR

sfr char P0 = 0x80; sbit SW = P0^0; void main(void) { while(1) { SW = !SW; } }

a ch ca cc bin sfr, sfr16, sbit phi nm bnngoi hm.

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Vng nh c nh a ch bit

8051 c vng nh c nh a ch bit. tc ng n vng nh ny ta dng khai bobdata

bdata char temp _at_ 0x2F;

bit flag = temp ^0;

void main(void)

{

flag = 1;

}

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Lu :

Cc khai bo code, idata, xdata, bdata, sfr, sbit l c bit cho trng hp lptrnh 8051.

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VD:

Vit chng trnh cho 8051 to hm nhsau:

P1.0 = P1.1 AND P1.2

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Cu trc vng lp v tn (endless loop)

void main(void)

{Task1_init();

Task2_init();

While(1) //m/t vng l2p v t4n th5c hin task1 v task2

{

Task1();

Task2();

}

}

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Endless loop

u im: n gin.

D thc hin, sa li v bo tr

Khng cn s dng nhiu ti nguyn hthng (VD: timer)

D dng thay i chy vi cc vi x lkhc (portable)

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Endless loop

Nhc im: Khng ph hp vi cc ng dng i hi

thi gian chnh xc (VD: ng h s).

Tiu tn nng lng v CPU hot ng ch bnh thng trong ton b thi gian

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Look-up table

unsigned char code square[]={0,1,4,9,16,25,36,49,64,81};

unsigned char cal_square(unsigned char num){

return square[num];}

Assembly:

MOV A,R7MOV DPTR, #SQUAREMOVC A,@A+DPTRMOV R7,A

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Question

a ch ca LED 7 on l bao nhiu?

lm LED hin th s 8, ta dng lnhcho 8051 nh th no? (dng assembly v C)

Xy dng bng m 7 on cho LED (chocc s ln hn 9 tt tt c on LED).

Vit chng trnh C c gi tr t 4 SW v hin th ln LCD. (Dng bng tra ly m 7 on).

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Giao tip switch

Switch l 1 trong nhng phng phpgiao tip chnh ca h thng nhng

Cc contact c kh s b rung khi nghoc m.

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Chng rung

Not pressedPress

detected

delay

Read againConfirmed

Press detected

delay

Read againJust a bounce

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Giao tip switch

Vi 8051, trc khi cswitch ta phighi 1 ra bcht ca chnport ang giaotip switch

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Vit chng trnh C c gi tr switch (cchng rung) v xut ra LED.

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Giao tip keypad

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Giao tip keypad

Chng trnh getkey():

Gi tr tr v: m phm (0-15) hoc 255 nu khng c phm nhn.

V lu

Vit code C

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Giao tip keypad

Chng trnh getkey_Debound()

Gi tr tr v: m phm (0-15) hoc 255 nu khng c phm nhn.

Cch thc hin:

Nu trong 20 ln lin tip gi chngtrnh getkey() tr v cng 1 gi tr, th l gi tr tr v ca getkey_Debound().

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Giao tip keypad

V lu cho chng trnhgetkey_Debound()

Vit code C

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Giao tip keypad

Vit chng trnh getCalKey_Debound():

Gi tr tr v l 1 trong cc k t:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, C, =, +, -, x, / hoc N nu khng cphm c nhn

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Hm printf()

Hm printf() rt c ch trong qu trnh vit vdebug chng trnh.

Mc nh, hm printf xut 1 chui k t raserial port ca 8051

Cu trc:

int printf ( const char * format, ... );

Chi tit tham kho ti:

http://www.cplusplus.com/reference/clibrary/cstdio/printf/

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Th vin ca Keil C

Keil C h tr rt nhiu th vin nh thvin xut nhp (stdio), ton (math),

Cc th vin v hm ca Keil C c ththam kho ti:

http://www.keil.com/support/man/docs/c51/c51_library.htm