[avrdude-dev] [bugs #9526] stk500 fosc command broken

[anonymous]

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[bugs #9526] Full Item Snapshot:

URL: <http://savannah.nongnu.org/bugs/?func=detailitem&item_id=9526>
Project: AVR Downloader/UploaDEr
Submitted by: 0
On: Thu 07/01/2004 at 16:13

Category:  None
Severity:  5 - Average
Item Group:  None
Resolution:  None
Assigned to:  None
Status:  Open


Summary:  stk500 fosc command broken

Original Submission:  There is a bug in stk500.c that prevents the fosc command 
from
working.  Here is an example:

avrdude> fosc 3.7M
>>> fosc 3.7M
avrdude: stk500_set_fosc(): f = 3.700 MHz too high, using 3.686 MHz
avrdude> parm
>>> parm
Vtarget         : 5.1 V
Varef           : 5.1 V
Oscillator      : 16.098 kHz
SCK period      : 1.1 us

This line
    cmatch = (unsigned)(fbase / (2 * v * ps[idx]));
needs to change to this
    cmatch = (unsigned)(fbase / (2 * fosc * ps[idx])) - 1;

I will submit a patch for this.

Galen Seitz













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