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mateeb4u@gmail.com
Joined: 07 Feb 2012
Posts: 19
Location: pakistan
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| I2c Ex_slave (receiving of data problem) |
 Posted: Mon Feb 20, 2012 1:19 am |
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I want to communicate 2 pic 18f452 controllers but these are not working correctly. I think there must be problem at slave side. The interrupt is not generating. I'm posting photos and code.
Pull-up resistors are 4.7k
Compiler ccs 4.084
I have to submit on Wednesday. Plz help me to resolve the problem.
Tell me about FORCE_HW & FORCE_SW.
Slave address is 0x60. By adding high bit at most least significant bit for writing from master to slave becomes 0xc0.
The master side is working correctly.
Master:
| Code: |
#include<18F452.h>
#use delay(clock = 4000000)
#use I2C(MASTER,SLOW, SDA=PIN_B7, SCL=PIN_B6,FORCE_SW)
#fuses NOWDT,NOPROTECT,NOLVP,XT
void main ()
{
while(1)
{
output_a(0xff);
delay_ms(2000);
i2c_start();
//while(i2c_write(0xc0));
i2c_write(0xC0);
output_a(0xC0);
delay_ms(1000);
i2c_write(0x1);
output_a(0x01);
delay_ms(1000);
i2c_write(0x02);
output_a(0x02);
delay_ms(1000);
i2c_write(0x03);
output_a(0x03);
delay_ms(1000);
i2c_write(0x04);
output_a(0x04);
delay_ms(1000);
i2c_write(0x05);
output_a(0x05);
delay_ms(1000);
i2c_stop();
}
}
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Slave :
| Code: |
#include <18F452.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use i2c(SLAVE, SDA=PIN_B7, SCL=PIN_B6, address=0x60,FORCE_SW)
BYTE address, buffer[0x10];
#INT_SSP
void ssp_interupt ()
{
BYTE incoming, state;
state = i2c_isr_state();
if(state < 0x80) //Master is sending data
{
incoming = i2c_read();
if(state == 1) //First received byte is address
address = incoming;
if(state == 2) //Second received byte is data
{
buffer[address] = incoming;
output_a(incoming);
}
}
if(state == 0x80) //Master is requesting data
{
i2c_write(buffer[address]);
}
}
void main ()
{
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
while (TRUE) {}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 20, 2012 2:27 pm |
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| Quote: | #include <18F452.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use i2c(SLAVE, SDA=PIN_B7, SCL=PIN_B6, address=0x60,FORCE_SW)
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There is no support for a software i2c slave. You must use the hardware
pins for an i2c slave. For an 18F452, this is pin C4 for SDA, and pin C3 for SCL. |
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mateeb4u@gmail.com
Joined: 07 Feb 2012
Posts: 19
Location: pakistan
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| thanks |
| Posted: Tue Feb 21, 2012 5:36 am |
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I have done it  |
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wasimakhlaq
Joined: 07 Feb 2012
Posts: 5
Location: Pakistan
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| Thanks |
| Posted: Tue Feb 21, 2012 8:04 am |
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Thanks all of you for your posts and helping us, we're done I2C communication using two PICs..
regards,
wasim |
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