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Message |
umut
Joined: 31 Mar 2010
Posts: 2
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| i2c problem with 2 pic16f877 |
 Posted: Wed Mar 31, 2010 11:31 am |
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I want to use one of them master and second is slave. Master takes data from rs232 and send them to the slave. I addressed the slave but I did not communicate properly. Could you help me? My code is:
Slave code is
| Code: |
#use_i2c(slave,sda=pin_c4,scl=pin_c3,slow=100000,address=0xA0,force_hw)
BYTE address, buffer[0x8];
#int_SSP
void ssp_interupt (){
BYTE state,incoming;
//clear_interrupt(int_ssp);
state = i2c_isr_state();
if(state < 0x80) //Master is sending data
{
//incoming = i2c_read();
if(state==0){
}
if(state == 1) //First received byte is address
{
address = i2c_read();
//data = incoming;
}
if(state == 2) //Second received byte is data
{
buffer[address] = i2c_read();
// f[address]=incoming;
//data = incoming;
}
}
if(state >= 0x80) //Master is requesting data
{
i2c_write(buffer[address]);
}
}
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Master code is
| Code: |
#include <16f877.h>
#use rs232 (baud=9600, xmit=pin_C6, rcv=pin_C7, parity=N, stop=1)
#use i2c(master,sda=pin_c4, scl=pin_c3,slow=100000,force_hw)
#define end_1 0xA0
#define end_1 0xB0
#int_rda
void serihaberlesme ()
{
disable_interrupts(int_rda); // interrupt pasif ediliyor
m=0;
printf("\n\r m>"); // BU KISIMDA rs 232den veriler alınıyor
d=gethex();
//putc(m);
printf("\n\radres>");
b=gethex();
//putc(adres);
printf("\n\rdata>");
c=gethex();
//putc(data);
enable_interrupts(int_rda);
}
void main ()
{
setup_psp(PSP_DISABLED);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_CCP1(CCP_OFF);
setup_CCP2(CCP_OFF);
enable_interrupts(int_rda);
enable_interrupts(GLOBAL);
delay_ms(1000);
i2c_start();
i2c_write(0xA0);
i2c_write(0x02);
i2c_write(0x08);
i2c_stop();
while (!m){
if (d==0)
{
i2c_start();
i2c_write(end_1);
i2c_write(0x02);
i2c_write(0x08);
// i2c_read();
i2c_stop();
}
else if(d==1){
i2c_start();
i2c_write(end_2);
i2c_write(c);
i2c_stop();
}
m=1;
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Mar 31, 2010 2:07 pm |
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First, try to get a simple i2c slave program working.
When you get that working, then try to make your own program work.
Use the CCS example file code, Ex_Slave.c, for the Slave PIC.
It's in this directory:
| Quote: |
c:\Program Files\picc\Examples\Ex_Slave.c
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Use the code in this post for the Master PIC:
http://www.ccsinfo.com/forum/viewtopic.php?t=32368&start=3 |
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umut
Joined: 31 Mar 2010
Posts: 2
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| Posted: Thu Apr 01, 2010 6:07 am |
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| thank you for your help |
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