Problem with I2C and TMR0 int on 16F873

[Mark DSylva]

<font face="Courier New" size=-1>Hi,
I have a strange problem related to some I2C slave code I wrote for the 16F873.

Everything was working well, and then I decided to disable the INT0 interrupt which I had originally enabled and made a small interrupt routine for, as I didn't need it in my project.

After removing the first line below,

enable_interrupts(int_timer0); // enable timer0
enable_interrupts(int_timer1); // enable rx timer

enable_interrupts(INT_RB); // enable portB input change int
enable_interrupts(INT_SSP);
enable_interrupts(GLOBAL);


in the initialisation code for the processor, one of my I2C data responses to another processor fails with a clock stretch timeout.

All that's in the interrupt routine is this:


#int_timer0
timer0_int() // TMR0 overflow interrupt
{
// DEBUG_PIN = ~DEBUG_PIN; (this line not used now)
tmr0IntCtr++;
}

I don't have any idea what is causing this.

Does anyone have any ideas? I'm using PCM 3.104

Thanks

Mark






</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 10033

[keith]

Hi Mark,

Did you solve your problem. I am having a i2c problems as well and was wondering what you may have leart from this problem.

thanks
Keith



:=<font face="Courier New" size=-1>Hi,
:=I have a strange problem related to some I2C slave code I wrote for the 16F873.
:=
:=Everything was working well, and then I decided to disable the INT0 interrupt which I had originally enabled and made a small interrupt routine for, as I didn't need it in my project.
:=
:=After removing the first line below,
:=
:= enable_interrupts(int_timer0); // enable timer0
:= enable_interrupts(int_timer1); // enable rx timer
:=
:= enable_interrupts(INT_RB); // enable portB input change int
:= enable_interrupts(INT_SSP);
:= enable_interrupts(GLOBAL);
:=
:=
:=in the initialisation code for the processor, one of my I2C data responses to another processor fails with a clock stretch timeout.
:=
:=All that's in the interrupt routine is this:
:=
:=
:=#int_timer0
:=timer0_int() // TMR0 overflow interrupt
:={
:= // DEBUG_PIN = ~DEBUG_PIN; (this line not used now)
:= tmr0IntCtr++;
:=}
:=
:=I don't have any idea what is causing this.
:=
:=Does anyone have any ideas? I'm using PCM 3.104
:=
:=Thanks
:=
:=Mark
:=
:=
:=
:=
:=
:=
:=</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 10068

[Mark DSylva]

:=Hi Mark,
:=
:=Did you solve your problem. I am having a i2c problems as well and was wondering what you may have leart from this problem.
:=
:=thanks
:=Keith

No I didn't solve it. I just kept the INT0 interrupt enabled for now, I'll have to re-visit this problem in a few days.


Mark
___________________________
This message was ported from CCS's old forum
Original Post ID: 10074

[Derek]

My I2C slave code does okay on a F877, but when I ported the code to the F873, the I2C intterupt only responds every other time.

Do you guys think this is related??

Derek






:=<font face="Courier New" size=-1>Hi,
:=I have a strange problem related to some I2C slave code I wrote for the 16F873.
:=
:=Everything was working well, and then I decided to disable the INT0 interrupt which I had originally enabled and made a small interrupt routine for, as I didn't need it in my project.
:=
:=After removing the first line below,
:=
:= enable_interrupts(int_timer0); // enable timer0
:= enable_interrupts(int_timer1); // enable rx timer
:=
:= enable_interrupts(INT_RB); // enable portB input change int
:= enable_interrupts(INT_SSP);
:= enable_interrupts(GLOBAL);
:=
:=
:=in the initialisation code for the processor, one of my I2C data responses to another processor fails with a clock stretch timeout.
:=
:=All that's in the interrupt routine is this:
:=
:=
:=#int_timer0
:=timer0_int() // TMR0 overflow interrupt
:={
:= // DEBUG_PIN = ~DEBUG_PIN; (this line not used now)
:= tmr0IntCtr++;
:=}
:=
:=I don't have any idea what is causing this.
:=
:=Does anyone have any ideas? I'm using PCM 3.104
:=
:=Thanks
:=
:=Mark
:=
:=
:=
:=
:=
:=
:=</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 10602