Kontron PCI-AOB16/12, User Manual, Page: 65 / 78

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PCI-AOB8/12 (16/12) User’s Guide
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Generate Frequency
The Generate Frequency function will generate a square wave (0 to +5V) with the desired
frequency. The Base Address of the card as well as the frequency are required as input to the
function. The counter can generate a frequency with a range of 1Hz to 250KHz. The square wave
can be read on the CLOCK OUT pin of the card.
void generatefrequency(unsigned BaseAddress, unsigned long
frequency);
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Pulse Width
The Pulse Width function will measure the width of an applied event from its rise to its fall
(effectively one half the period). The Base Address of the card is required as input to the
function. The signal should be applied to the CLOCK IN pin of the card. Software latency will be
affected by the operating system and will set a limit on the precision of the measurement.
unsigned pulse_width(unsigned BaseAddress);