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Fixed PDI/TPI programming speed of ~250KHz in the AVRISP-MKII Clone project, instead of the desired 500KHz.

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This commit is contained in:
Dean Camera 2010-11-12 06:24:01 +00:00
parent 50390867e7
commit d41cd9a41a
4 changed files with 8 additions and 4 deletions
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2
Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
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@ -199,7 +199,7 @@ void ISPTarget_ConfigureRescueClock(void)
/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
TIMSK1 = 0;
TCNT1 = 0;
OCR1A = ((F_CPU / 2 / 4000000UL) - 1);
OCR1A = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
TCCR1A = (1 << COM1A0);
TCCR1B = ((1 << WGM12) | (1 << CS10));
}

7
Projects/AVRISP-MKII/Lib/ISP/ISPTarget.h
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@ -59,8 +59,11 @@
/** Low level device command to issue an extended FLASH address, for devices with other 128KB of FLASH. */
#define LOAD_EXTENDED_ADDRESS_CMD 0x4D
/** Macro to convert an ISP frequency to a number of timer clock cycles for the software SPI driver */
#define TIMER_COMP(freq) ((((F_CPU / 8) / freq) / 2) - 1)
/** Macro to convert an ISP frequency to a number of timer clock cycles for the software SPI driver. */
#define TIMER_COMP(freq) (((F_CPU / 8) / 2 / freq) - 1)
/** ISP rescue clock speed, for clocking targets with incorrectly set fuses. */
#define ISP_RESCUE_CLOCK_SPEED 4000000
/* External Variables: */
extern bool HardwareSPIMode;