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Incorrect interrupt frequency shown in FC 4 AVR for AVR chip
Posted: Wed Feb 09, 2011 3:37 pm
by nils
Hello,
As I was going through interrupts, I noticed that the settings for TMR0 Overflow interrupts are not showing any difference when going through prescaler values.
Is this a bug, as I remember this working correct in FC v3 for the AVR.
Kind regards,
Nils
Re: Incorrect interrupt frequency shown in FC 4 AVR for AVR
Posted: Thu Feb 10, 2011 11:15 am
by Sean
The problem seems to caused by some missing information in the files that describe the target devices.
Here is a modified version of the ATmega324P file.
This file should be copied into the FCD folder of the Flowcode AVR V4 installation (with Flowcode not running).
Details:
The existing [TMR0] section of each .fcd file requires the following lines adding
MaxTimerOverflow=256
PrescaleOpt=1
Example:
[TMR0]
Name="TMR0 Overflow"
UseExplicitHandlerCode=1
FlagReg=
FlagBit=
HandlerCode="#ifndef MX_TIMER0OVF_HANDLER\n#define MX_TIMER0OVF_HANDLER\nISR(TIMER0_OVF_vect)\n{\n\tFCM_%n();\n}\n#else\n#warning The <TIMER0 OVF> interrupt has previously been enabled, so the macro <%n> may never get called.\n#endif\n"
UseExplicitEnableCode=1
EnReg=
EnBit=
EnableCode="TIMSK0 |= (1 << TOIE0);\n"
DisableCode="TIMSK0 &= ~(1 << TOIE0);\n"
OptCnt=1
TmrOpt=1
MaxTimerOverflow=256
PrescaleOpt=1
Opt1="Clock Source & Prescaler Select"
Opt1Cnt=8
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