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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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6
Projects/AVRISP-MKII/AVRISP-MKII.txt
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@ -105,9 +105,9 @@
* </tr>
* </table>
*
* In addition, the AVR's OCR1A pin will generate a .5MHz clock, to act as an external rescue device clock
* if the fuses have been mis-set. To use the recovery clock, connect the OCR1A pin of the USB AVR to the target
* AVR's XTAL1 pin, and set the ISP programming speed to 125KHz (note: other ISP speeds will not work correctly).
* In addition, the AVR's OCR1A pin will generate a 4MHz clock, to act as an external rescue device clock if the
* fuses have been mis-set. To use the recovery clock, connect the OCR1A pin of the USB AVR to the target AVR's
* XTAL1 pin, and set the ISP programming speed to 125KHz (note: other ISP speeds will not work correctly).
*
* <b><sup>1</sup></b> <i>Optional, see \ref SSec_Options section - for USB AVRs with ADC modules only</i> \n
* <b><sup>2</sup></b> <i>See AUX line related tokens in the \ref SSec_Options section</i>