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Adding to the todo list and readme; fixing a bit of indentation.

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This commit is contained in:
David A. Mellis
2008-03-08 22:05:23 +00:00
parent a50a2d888f
commit ff9bb8dd14
3 changed files with 18 additions and 10 deletions
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16
hardware/cores/arduino/wiring.c
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@ -66,7 +66,7 @@ void delayMicroseconds(unsigned int us)
//delay_us(us);
#if F_CPU >= 16000000L
// for the 16 MHz clock on most Arduino boards
// for the 16 MHz clock on most Arduino boards
// for a one-microsecond delay, simply return. the overhead
// of the function call yields a delay of approximately 1 1/8 us.
@ -81,11 +81,11 @@ void delayMicroseconds(unsigned int us)
// account for the time taken in the preceeding commands.
us -= 2;
#else
// for the 8 MHz internal clock on the ATmega168
// for the 8 MHz internal clock on the ATmega168
// for a one- or two-microsecond delay, simply return. the overhead of
// the function calls takes more than two microseconds. can't just
// subtract two, since us is unsigned; we'd overflow.
// for a one- or two-microsecond delay, simply return. the overhead of
// the function calls takes more than two microseconds. can't just
// subtract two, since us is unsigned; we'd overflow.
if (--us == 0)
return;
if (--us == 0)
@ -96,9 +96,9 @@ void delayMicroseconds(unsigned int us)
// delay requested.
us <<= 1;
// partially compensate for the time taken by the preceeding commands.
// we can't subtract any more than this or we'd overflow w/ small delays.
us--;
// partially compensate for the time taken by the preceeding commands.
// we can't subtract any more than this or we'd overflow w/ small delays.
us--;
#endif
// disable interrupts, otherwise the timer 0 overflow interrupt that