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Forum: ARM programming with GCC/GNU tools need help in programming 7 segment display


von Veleda A. (veleda)


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Hi Alll...
I am new to this forum.
I am trying to interface 4 digit 7segment display with AM lpc2138
I am working in Keil uVision4.
I wrote the code...but its not working.
Can anybody help me?
I am writing my code here.
Plz plz plz..help me asap.
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#include<lpc21xx.h>
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void wait(void)
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{
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int d;
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for(d=0;d<100000;d++)
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}
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#define SEGCONTROL 0x000000F0  //port0 pin 0.4 to 0.7 selected
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#define SEG1 0x00000010  //1ST DIGIT out of 4 dig 7 segment selected
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#define SEG2 0x00000020  
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#define SEG3 0x00000040
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#define SEG4 0x00000080
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#define SEGDATA 0xFF000000  //port1 pin 1.24 to 1.31 selected
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#define ONE     0xF9000000
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#define TWO     0XA4000000
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#define THREE   0xB0000000
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#define FOUR    0X99000000
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#define FIVE    0X92000000
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#define SIX     0x82000000
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#define SEVEN   0xF8000000
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#define EIGHT   0x80000000
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#define NINE    0x90000000
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#define ZERO    0xC0000000
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void DispData(int data);
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void DispON(int ID);
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void ShowDigit(int r, int i);
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void DispOFF(int ID);
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int main(void)
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{
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int count;
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IODIR0 = SEGCONTROL;
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IODIR1 = SEGDATA;
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DispON(SEG1);
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DispData(ONE);
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for(count = 0; count<=9999; count++)
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{
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IOCLR1 = 1234;
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DispData(count);
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wait();
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wait();
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wait();
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}
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void DispON(int ID)
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{
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IOSET0 = ID;
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wait();
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IOCLR0 = ID;
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IOSET0 = 0Xfffffffff & (~ID);
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}
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void DispOFF(int ID)
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{ IOSET1 = SAGDATA;
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}
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void DispData(int data)
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{
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int r, int i;
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for(i= 0; i<4; i++)
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{
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if(data>9)
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{
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r = data%10;
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ShowDigit(r,i);
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data = data/10;
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}
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else if(data >= 0 && data<=9)
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{
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ShowDigit(r,i);
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i=4;
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}
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wait();
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wait();
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}
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void ShowDigit(int r, int i)
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{
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switch(i)
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{
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case 0: DispON(SEG1);
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        break;
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.
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.
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.
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case 3: DispON(SEG3);
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        break;
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}
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wait();
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switch(r)
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{
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 case 0: IOSET1 = ZERO;
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         wait();
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         IOCLR1 =ZERO;
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         break;
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.
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.
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.
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.
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case 9: IOSET1 = NINE;
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         wait();
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         IOCLR1 =NINE;
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         break;  
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}
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wait();
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switch(i)
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{
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case 0: DispOFF(SEG1);
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        break;
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.
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.
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.
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case 3: DispOFF(SEG3);
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        break;
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}
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}

its not working!!!
plz tell me where i am going wrong

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