Why don't you try this first :
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char disp[]={ 0x50,0x51,0x52,0x53 } ;
char masks[]={ 0b11100000,0b11010000,0b10110000,0b01110000 } ;
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char disp[]={ 0x50,0x51,0x52,0x53 } ;
char masks[]={ 0b11100000,0b11010000,0b10110000,0b01110000 } ;
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pause = 1000;
// ...
Vdelay_ms(pause); // ~ one second pause