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Author SHA1 Message Date
Markus Hitter 7afbc70d58 Step timer: reset timer after pauses instead of doing a guess. 
We know already wether we start from a pause or not, so let's
take advantage of this knowledge instead of checking for
plausibility of a timer delay at interrupt time.

Costs just 8 bytes binary size:

    SIZES          ARM...     lpc1114
    FLASH  :  7764 bytes          24%
    RAM    :   960 bytes          24%
    EEPROM :     0 bytes           0%

Due to the less code at interrupt time, maximum step rate was
raised from 127.9 kHz to 130.6 kHz.
 2015-08-12 14:26:37 +02:00
Markus Hitter 5d8e866501 Move interrupt busy detection from dda_clock() to clock tick ISR. 
The reason is, interrupts can't be re-entered on ARM, so we need
a different mechanism.
 2015-08-12 14:26:37 +02:00
Markus Hitter feeb411eec ARM: split timer.c into platform specific files. 
AVR and simulator are kept together, because the simulator
apparently simulates much of the AVR timer infrastructure.

ARM variant is empty, so far.
 2015-08-12 14:26:36 +02:00