ahoneybun/qmk_firmware
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Added board hardware driver support for the Adafruit U4 breakout board.

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Fixed calculation of timer register reload values derived from F_CPU; must subtract one from the division result for the compare value to be correct.

Change AVRISP-MKII rescue clock speed to 4MHz to ensure that a 125KHz ISP speed works regardless of the target's fuses (i.e. DIV8 set).
This commit is contained in:
Dean Camera 2010-11-08 03:41:48 +00:00
parent bac860b173
commit 0ce2950d81
14 changed files with 148 additions and 13 deletions
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4
Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
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@ -196,10 +196,10 @@ void ISPTarget_ConfigureRescueClock(void)
DDRB |= (1 << 5);
#endif
/* Start Timer 1 to generate a .5MHz clock on the OCR1A pin */
/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
TIMSK1 = 0;
TCNT1 = 0;
OCR1A = (F_CPU / 2 / 500000UL);
OCR1A = ((F_CPU / 2 / 4000000UL) - 1);
TCCR1A = (1 << COM1A0);
TCCR1B = ((1 << WGM12) | (1 << CS10));
}