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ze.vana
Joined: 11 Jun 2011
Posts: 15
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| PIC to PIC Display data transfer |
 Posted: Sat May 26, 2012 6:44 am |
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Hi people
that is a simple example of data transfer PIC to PIC using small and cheap PICs. Maybe this would be useful for beginners like me!
send.c
| Code: |
#include <16f628a.h>
#fuses INTRC_IO, NOLVP, NOWDT, PUT, BROWNOUT
#use delay (clock=4M)
#use rs232(baud=9600,XMIT=PIN_B2,RCV=PIN_B1,bits=8)
//#include "ds18b20.c"
byte send[3];
#define sreset (pin_b0)//RB0 ->- PIN1 MLCR 16F876 (resets display)
int8 div;
int8 temp=15;//temperature
int8 hrs=7,min=22;
void send_dat(void)
{
int i;
for (i=0; i<3; ++i)//1° RODA O I 10 VEZES
{
putc(send[i]);
}
}
void main(void)
{
int1 powerup;
set_tris_a(0x00); //DQ PIN_a4
set_tris_b(0b00111000); //RB1 RB2 Rx/tx) / RB0 ->- PIN1 MLCR 16F876
output_low sreset;div=0;
powerup=false;
while(true)
{
// ds1307_get_time(hrs,min,sec);
output_toggle(pin_b3);//it's working!
send[0]=hrs; send[1]=min; send[2]=temp;
div++;
if(!powerup && div >=10) { powerup=true; output_high sreset;} //RB0 ->- PIN1 MLCR 16F876
if(powerup && div >10) {send_dat(); div=0; }
}
}
//RESET is to synchronize data transfer during initialization.
///////////////////////////////////////////////////////////////
// Put a 10K resistor from pin1 F876 to VDD 5V //
// to VDD //
// ---------- --------- ------- //
// | RB0 |6-----------1|MCLR B0|- A| DIS- | //
// | F628 | | F876 B1|- B|PLAY | //
// | X RB2|8----------18|C7 RX B2|- C| | //
// | | TXD-> | B3|- D| | //
///////////////////////////////////////////////////////////////
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Receive.c
| Code: |
#include <16F876a.h>
#device ADC=10
#fuses XT, NOLVP, NOWDT, PUT, BROWNOUT
#use delay (clock=4M)
#use rs232(baud=9600,XMIT=PIN_C6,RCV=PIN_C7,bits=8)
int16 div;
int hrs,min;
int hor4,hor3,hor2,hor1;
int temp;
int var2=0, var1=0;
int8 scan,div2;
#include "display.c"
byte receiv[3];
#INT_RDA
void rda_isr()
{
int i;
for (i=0; i<3; ++i)//receive 3 datas
{ //0 is the first
receiv[i]=getc();
}
hrs=receiv[0]; min=receiv[1]; temp=receiv[2];
}
void select(void)
{
if (div <4000 )//show hours
{
dig4=hor4;//dez hora
dig3=hor3;//unid hora
dig2=hor2;//dez minuto
dig1=hor1;//unid minuto
}
if(div >2000 )//show degrees
{
dig4=var2; //dezena de graus
dig3=var1; //unidade de graus
dig2=10; //grau Simbolo
dig1=11;//11= zero off
}
div++;
if(div >4000) div=0;
}
void convert(int valor)//temperature
{
var2=valor/10; // 45 / 10=4
var1=valor -(var2 * 10); // 45 -(4 x 10)=5
}
void main()
{
enable_interrupts(global);
enable_interrupts(INT_rda);
set_tris_a(0x01);
set_tris_b(0x00);
set_tris_C(0b10000000 );
div=0; div2=0; scan=100; //display time -> delay_ms(scan)
while (true)
{
hor4=hrs/10; //ex.: 23 /10 =2
hor3=hrs -(hor4 * 10); // 23 -(2 x 10)=3
hor2=min/10; // ex.: 45 / 10 =4
hor1=min -(hor2 * 10);// 45 -(4 x 10) =5
convert(temp);
mostra();//Display
select();
}
}
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Display.c
| Code: |
////////////////////////////// display moto
//display PIC 16f876a // I use it on my Byke
//B0 A C0 K1 // to show time and degrees
//B1 B C1 K2 //
//B2 C D2 K3 //
//B3 D D3 K4 //
//B4 E //
//B5 F //
//B6 G B7 NOT USED //
//////////////////////////////
struct cont_pins
{
int data:4;//digitos
} cont;
#byte cont = 7 // 7 is the portc address.
//---------------------------------------
byte CONST seg[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0b1100011,0b0000000,0b1000000};
int dig4=0,dig3=0,dig2=0,dig1=0; // 10=degree symbol 11=zero_off 12=negative signal
void mostra(void)
{
output_b(seg[dig4]);
cont.data=0b1110;//1 k4,k3,k2,k1
delay_us(scan);
cont.data=0b1111; //Apaga display.
delay_us(10);
output_b(seg[dig3]);
cont.data=0b1101; //2
delay_us(scan);
cont.data=0b1111; //Apaga display.
delay_us(scan);
output_b(seg[dig2]);
cont.data=0b1011;//4
delay_us(scan);
cont.data=0b1111; //Apaga display.
delay_us(scan);
output_b(seg[dig1]);
cont.data=0b0111;//8
delay_us(scan);
cont.data=0b1111; //Apaga display.
delay_us(scan);;
} |
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dyeatman
Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK
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| Posted: Sat May 26, 2012 8:15 am |
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Thank you ze, I think this can be helpful to some of the upcoming "newbies".
However, a couple of suggestions:
1. Add comments at the start of the program with a description of how the
PICS are connected and any other useful info.
2. Clean up and post in the Code Library for everyone.
These types of contributions are a help to all. Thanks for your efforts!
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