read multiple input and display corresponding digit

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mailus

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My Requirements,
i am using pic microcontroller

i have 9 inputs, output-1,display 7 segment-1(single segment).

read input from PORTC and RA0_pin.

if rc0_bit low means the display show as 1,

if rc0_bit and rc5_bit low means the display show 1 and 6 at a particular interval,

similarly for each and every combination of input the display must show the corresponding output.

i designed a program but i need to develop in different way

my program:

Code: 
void main()
{
 adcon1=0x06;cmcon=0x06;
 TrisA=0x01;TrisB=0x00;TrisC=0xff;
 porta=0x00;portb=0x00;portc=0x00;
 read_input,x=0;
 do
 {
  read_input=portc^0xff;
  if(read_input==0)
  {
  x=0;
  control(x);
  portb=0x3f;
  }
  if(RC0_bit==0)
  {
  x=1;
  control(x);
  portb=0X06;
  delay_ms(1000);
  }
  if(RC1_bit==0) 
  {
  x=2;
  control(x);
  portb=0X5b;
  delay_ms(1000);
  }
  if(RC2_bit==0)
  {
  x=3;
  control(x);
  portb=0X4f;
  delay_ms(1000);
  }
  if(rc3_bit==0)
  {
  x=4;
  control(x);
  portb=0X66;
  delay_ms(1000);
  }
  if(rc4_bit==0)
  {
  x=5;
  control(x);
  portb=0X6d;
  delay_ms(1000);
  }
  if(rc5_bit==0)
  {
  x=6;
  control(x);
  portb=0X7d;
  delay_ms(1000);
  }
  if(rc6_bit==0)
  {
  x=7;
  control(x);
  portb=0X07;
  delay_ms(1000);
  }
  if(rc7_bit==0)
  {
  x=8;
  control(x);
  portb=0X7f;
  delay_ms(1000);
  }
  delay_ms(100);
  }while(1);
}
 
Last edited:

Suppose all pin low then u require to show 0 to 8 for port C & for RA0 low it is 9. For such situation I u design timer for display interval say 100 ms now i just right step.

1. After every 100 ms display update.
2. increment one counter for each time till 0 to 9
3. Sense input port & check each pin status by bit condition set variable u can direct read PORTC & store in variable bit_pos. say unsigned int bit_pos & ur input is 0, 3, 7 & 8[RA0]
then bit_pos = 0 01110110 is ur input status.
4. After each 100 ms check bit status if it is low then pass this bit location to display routine say unsigned char dis_var then for bit 0 dis_var = 0, for 3 bit pos dis_var=3 if bit is high then previous data. If no bit then pass oo or FF depend on segment type means common anode or cathode.
 

please explain with example

Sense input port & check each pin status by bit condition set variable u can direct read PORTC & store in variable bit_pos. say unsigned int bit_pos & ur input is 0, 3, 7 & 8[RA0]
Click to expand...
but the input is random between 0~9 (portc and ra0)
by predict each and every input is tough (2^9=512)
 

It's simple
unsigned int bit_pos =0;
unsigned char temp =0;
if(RA0==0)
{
bit_pos = 0xFEFF;
}
else
{
bit_pos = 0xFFFF;
}

bit_pos = bit_pos<<9; // 1111 1110 1111 1111 or 1111 1111 1111 1111
temp = PORTC;
bit_pos = bit_pos^ temp;

switch (bit_pos)
{
case(65279):// bit RA0 action;
break;

case(65534):// bit RC0 action;
break;
so on....
}

- - - Updated - - -

It's simple
unsigned int bit_pos =0;
unsigned char temp =0;
if(RA0==0)
{
bit_pos = 0xFEFF;
}
else
{
bit_pos = 0xFFFF;
}

bit_pos = bit_pos<<9; // 1111 1110 1111 1111 or 1111 1111 1111 1111
temp = PORTC;
bit_pos = bit_pos^ temp;

switch (bit_pos)
{
case(65279):// bit RA0 action;
break;

case(65534):// bit RC0 action;
break;
so on....
}
 

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