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  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Mon Aug 24, 2009 1:27 pm   Subject: Software RS232 that is not disturbed by Interrupt
Got it working with 2400baud using fast io
  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Mon Aug 24, 2009 12:45 pm   Subject: Software RS232 that is not disturbed by Interrupt
I've tested it with the real hardware and it works very good.
  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Mon Aug 24, 2009 12:10 pm   Subject: Software RS232 that is not disturbed by Interrupt
OK,

thanks,

I got it working with 1200 baud in my simulator.

At 2400 baud I had a problem with the length of the interrupt routine.
I missed 3 us to get in sync.

Maybe I can optimize the ...
  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Mon Aug 24, 2009 1:36 am   Subject: Software RS232 that is not disturbed by Interrupt
Did anybody try this on a 12F629.

i tried to do this with the #int_global bt then i'm out of rom
  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Fri Aug 21, 2009 2:05 am   Subject: Software RS232 that is not disturbed by Interrupt
I'm using a 12F629.

The 16F877 is just my debug device.
and the desired clock for the 12f629 is the internal 4mhz.

No HW UART.

My code contains some german comments:
The "accurateinte ...
  Topic: Software RS232 that is not disturbed by Interrupt
chaertl1

Replies: 12
Views: 9316

PostForum: General CCS C Discussion   Posted: Fri Aug 21, 2009 1:30 am   Subject: Software RS232 that is not disturbed by Interrupt
Hi,

Does anyone have an example for using software RS232 where an interrupt does not affect the getchar() function.

CLOCK = 8Mhz
My TIMER0 interrupt fires at 6400 Hz for pwm generation. every ( ...
  Topic: Accurate timer interrupt programming
chaertl1

Replies: 8
Views: 12302

PostForum: General CCS C Discussion   Posted: Tue Aug 18, 2009 10:55 pm   Subject: Accurate timer interrupt programming
Is it possible to prevent the compiler to implement its own interrupt code.
  Topic: Accurate timer interrupt programming
chaertl1

Replies: 8
Views: 12302

PostForum: General CCS C Discussion   Posted: Mon Aug 17, 2009 12:08 pm   Subject: Accurate timer interrupt programming
@ckielstra

the set_timer_x(get_timer_X + Y) is only possible if you are not to close to
the rollover point (256).
  Topic: Accurate timer interrupt programming
chaertl1

Replies: 8
Views: 12302

PostForum: General CCS C Discussion   Posted: Mon Aug 17, 2009 6:15 am   Subject: Accurate timer interrupt programming
HI,

I discovered a problem, nobody explained in this forum.


If you need an interrupt frequency of 6400Hz at 4Mhz clock frequency,
someone might get in trouble with the accuracy of the interru ...
 
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