bugAVR C Runtime Library - Bugs: bug #41502, TWI Library changes TIMSK2

 
 

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bug #41502: TWI Library changes TIMSK2

Submitter:  None
Submitted:  Fri 07 Feb 2014 01:01:25 PM UTC
   
 
Category:  Library Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Header files
Status:  None Assigned to:  None
Percent Complete:  0% Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  1.7.1
Fixed Release:  None

Fri 07 Feb 2014 01:01:25 PM UTC, original submission:  

TWI_Init changes the Timer/Counter Interrupt Mask Register of Timer 2 (TIMSK2) as you can see here:

TWI_Init (void)
{
  // Port Setup
  DDRC &= ~((1 << PC0)|(1 << PC1));
  PORTC |= (1 << PC0)|(1 << PC1);
 
  // Setup TWI Speed to 400kHZ (TWPS = 1)
  TWBR = 3;
 
  // Using TIMER2 to detect timeout
  TCCR2B = (7 << CS20);
  TIMSK2 = (1 << OCIE2A);
 
  OCR2A = 125;
 
  // Interrupts REQUIRED!
  sei();
}


Anonymous

 

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Attached Files
file #30480:  twi.c added by None (1KiB - application/octet-stream)
file #30481:  twi.h added by None (244B - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -email is unavailable- added by None (Submitted the item)
  •  

    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-02-07 None Attached File- Added twi.c, #30480
        Attached File- Added twi.h, #30481

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