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iVoVa
Joined: 12 Mar 2011
Posts: 7
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| Proteus I2C have a problem, help me ! |
 Posted: Wed Mar 16, 2011 11:16 pm |
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| Code: | #include<18F4520.h>
#include"DEF_18F4520.c"
#fuses HS
#use delay(clock = 4000000)
#use I2C(MASTER , SDA = PIN_C4, SCL = PIN_C3)
#use FAST_IO( A B)
#use FAST_IO ( C D )
#define slave_address 0x41
int8 data_in ;
void i2c_send(data_in)
{
i2c_start();
i2c_write(slave_address);
i2c_write(data_in);
i2c_stop();
}
void main()
{
while(true)
{
data_in = input_B();
i2c_send(data_in);
}
} |
| Code: | #include<18F4520.h>
#include"DEF_18F4520.c"
#fuses HS
#use delay(clock = 4000000)
#use I2C(SLAVE , SDA = PIN_C4, SCL = PIN_C3, address = 0x41)
#use FAST_IO(B)
int8 data_out ;
#INT_SSP
void i2c_isr()
{
int8 state;
state = i2c_isr_state();
if(state<0x80)
{
if (state == 1)
{
data_out = i2c_read();
output_b(data_out);
}
}
if(state >= 0x80)
{
}
clear_interrupt(INT_SSP);
}
void main()
{
trisb = 0x00;
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
while(true)
{
}
} |
Port B at Slave do not show the input from Master. Please help me to fix my problem. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Mar 16, 2011 11:33 pm |
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Your program has some mistakes. For example, you have an odd
number as the i2c slave address. But it must be an EVEN number.
Also, the pull-up resistors on your schematic should be changed to
4.7K (4700 ohms).
If you can't make your program work, then I suggest that you 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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iVoVa
Joined: 12 Mar 2011
Posts: 7
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| Posted: Thu Mar 17, 2011 5:36 am |
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Thanks PCM so much, you help me get a lot of knowledges.
My program worked. |
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