Arithmetic and logic operations in c
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This document contains multiple code snippets in C programming language for the 8051 microcontroller. The code snippets provide solutions to various exercises involving toggling or monitoring bits on ports P1, P2 and P3, sending ASCII characters to ports, creating time delays, and converting ASCII digits to BCD code.
![Write a program to send ASCII characters ABCDEF on P1
#include <reg51.h>
void MSDelay(unsigned int);
void main(void)
{
code unsigned char mynum[]= "ABCDEF";
unsigned char z;
while (1)
{ {
for(z=0;z<=6;z++)
{ P1=mynum[z];
MSDelay(1000);
}}}
void MSDelay(unsigned int itime)
{
unsigned int i, j;
for(i=0;i<itime;i++)
for(j=0;j<1275;j++);
}](https://image.slidesharecdn.com/forwhileifswitchstatementsinembeddedc-201017141406/85/Arithmetic-and-logic-operations-in-c-13-320.jpg)
Arithmetic and logic operations in c
- 1. DR. VIKAS J. DONGRE HOD ELECTRONICS & TELECOM GOVERNMENT POLYTECHNIC WASHIM (MS) EMAIL: [email protected]
- 2. Write an 8051 C program to toggle all the bits of P1 continuously. Solution: //Toggle P1 forever #include <reg51.h> void main(void) { for (;;) { P1=0x55; P1=0xAA; } }
- 3. Write an 8051 C program to toggle bits of P1 continuously forever with some delay. Solution: #include <reg51.h> void main(void) { unsigned int x; for (;;) //repeat forever { P1=0x55; for (x=0;x<40000;x++); //delay size//unknown P1=0xAA; for (x=0;x<40000;x++); } }
- 4. Write an 8051 C program to toggle bits of P1 continuously forever with some delay. Solution: #include <reg51.h> void main(void) { unsigned int x; P1=0x55; for (;;) //repeat forever { P1=~P1; for (x=0;x<40000;x++); //delay size//unknown } }
- 5. Write an 8051 C program to toggle bits of P1 continuously forever with some delay. Solution: #include <reg51.h> void main(void) { unsigned int x; P1=0x55; //initialize P1 with some input While(1) //repeat forever { P1=~P1; //toggle the data in P1 for (x=0;x<40000;x++); //delay size//unknown } }
- 6. Write an 8051 C program to toggle bit D0 of the port P1 (P1.0) 50,000 times. Solution: #include <reg51.h> sbit MYBIT=P1^0; void main(void) { unsigned int z; for (z=0;z<=50000;z++) { MYBIT=0; MYBIT=1; } }
- 7. To create Time delay -- Three factors that can affect the accuracy of the delay- 1. The 8051 design.. The number of machine cycle The number of clock periods per machine cycle 2. The crystal frequency connected to the X1 – X2 input pins 3. Compiler choice C compiler converts the C statements and functions to Assembly language instructions Different compilers produce different code
- 8. Toggle P1 with fixed 1 second delay #include <reg51.h> void MSDelay(void); void main(void) {while (1) { P1=0x55; MSDelay(); P1=0xAA; MSDelay(); } } void MSDelay(void) { unsigned int i,j; for (i=0;i<4;i++) for (j=0;j<1275;j++); }
- 9. Write an 8051 C program to toggle bits of P1 ports continuously with a 250 ms. Solution: #include <reg51.h> void MSDelay(unsigned int); void main(void) {while (1) { P1=0x55; MSDelay(250); P1=0xAA; MSDelay(250); } } void MSDelay(unsigned int itime) { unsigned int i,j; for (i=0;i<itime;i++) for (j=0;j<1275;j++); }
- 10. Write an 8051 C program to monitor bit P1.5. If it is high, send 55H to P2; otherwise, send AAH to P2. #include <reg51.h> sbit mybit=P1^5; void main(void) { mybit=1; while (1) {if (mybit==1) P2=0x55; else P2=0xAA; } }
- 11. Write an 8051 C program to read the P1.0 and P1.1 bits and issue an ASCII character to P0 according to the following table. P1.1 P1.0 0 0 send 0 to P0 0 1 send 3 to P0 1 0 send 7 to P0 1 1 send F to P0 Solution:
- 12. #include <reg51.h> void main(void) { unsigned char z; while(1) {z=P1; z=z&0x3; switch(z) { case(0): {P0=0x00;break;} case(1): {P0=0x03;break;} case(2): {P0=0x07;break;} case(3): {P0=0x0f;break;} }}}
- 13. Write a program to send ASCII characters ABCDEF on P1 #include <reg51.h> void MSDelay(unsigned int); void main(void) { code unsigned char mynum[]= "ABCDEF"; unsigned char z; while (1) { { for(z=0;z<=6;z++) { P1=mynum[z]; MSDelay(1000); }}} void MSDelay(unsigned int itime) { unsigned int i, j; for(i=0;i<itime;i++) for(j=0;j<1275;j++); }
- 14. Write a program to toggle P1, P2, P3 continuously sfr P0 = 0x80; sfr P1 = 0x90; sfr P2 = 0xA0; void MSDelay(unsigned int); void main(void) { P0=0x55; P1=0x55; P2=0x55; while(1) { P0=~P0; P1=~P1; P2=~P2; MSDelay(1000); }} void MSDelay(unsigned int itime) { unsigned int i, j; for(i=0;i<itime;i++) for(j=0;j<1275;j++); }
- 15. Write an 8051 C program to convert ASCII digits of ‘4’ and ‘7’ to packed BCD and display them on P1. #include <reg51.h> void main(void) { unsigned char bcdbyte; unsigned char w='4'; unsigned char z='7'; w=w&0x0F; w=w<<4; z=z&0x0F; bcdbyte=w|z; P1=bcdbyte; }