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Software I2C master problem

 
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Guest
Software I2C master problem
PostPosted: Thu May 03, 2007 7:40 am     Reply with quote
The device hangs up when I do not use the I2C hardware pins.

When I use PIN_B6 for SCL it works, and pin A4 is toggling, so do the I2C pins.

When I use PIN_B7 (or any other pin) for SCL there is no activity on pin A4 or the I2C pins.

Any ideas?

I need to use software I2C, I will later on use 2 I2C ports...

Code:
#include <16F690.h>
#device adc=8


#FUSES NOWDT                    //No Watch Dog Timer
#FUSES INTRC_IO                 //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT                //Code not protected from reading
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOCPD                    //No EE protection
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOIESO                   //Internal External Switch Over mode disabled
#FUSES NOFCMEN                  //Fail-safe clock monitor disabled

#use delay(clock=8000000)

#define SC_SDA PIN_B4
#define SC_SCL PIN_B6

#use i2c(Master, sda=SC_SDA, scl=SC_SCL, slow, STREAM=SC1 )

void main()
{
   int16 x;
   int8 y;
     
   set_tris_a(4);
   output_a(4);
   
   while(TRUE) {
     
      x = 12345;
      y = 12;
     
      i2c_start( SC1 );
      i2c_write (SC1, make8(x,1));
      i2c_write (SC1, make8(x,0));
      i2c_write (SC1, y);
      i2c_stop( SC1 );   
   
      output_low(PIN_A4);
      delay_ms(50);
      output_high(PIN_A4);
      delay_us(10);
   }
}
Guest
PostPosted: Thu May 03, 2007 7:45 am     Reply with quote
This works!

#define SCENECAM_SDA PIN_C6
#define SCENECAM_SCL PIN_B4


This makes the compiler hang!

#define SCENECAM_SDA PIN_B4
#define SCENECAM_SCL PIN_C6
Guest
PostPosted: Thu May 03, 2007 7:52 am     Reply with quote
C0 and C1 does not work together either! :(
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Thu May 03, 2007 9:00 am     Reply with quote
Quote:
#use i2c(Master, sda=SC_SDA, scl=SC_SCL, slow, STREAM=SC1 )


I2C statements do not use a 'Stream'. This is for defining multiple RS232 ports. Try taking that out of your #USE statement and see what happens.

Ronald
strombom



Joined: 04 May 2007
Posts: 4

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PostPosted: Fri May 04, 2007 12:57 am     Reply with quote
According to the manual it does:

STREAM=id
Associates a stream identifier with this I2C port. The identifier may then be used in functions like i2c_read or i2c_write.


I also got this answer from support before I bought the compiler:

Code:

Do something like:
 
#use i2c(Master,Slow,sda=PIN_B4,scl=PIN_C6, STREAM=ONE)
#use i2c(Master,Slow,sda=PIN_C0,scl=PIN_A2, STREAM=TWO)

i2c_start( ONE );
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Fri May 04, 2007 10:30 am     Reply with quote
Okay, I don't use Version 4 yet because of the bugs and Stream was not an option in V3.xxx.

Ronald
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