Instruction manual
Table Of Contents
- INTRODUCTION
- GETTING STARTED
- MAKING THE CONNECTIONS
- USING THE PC215E
- STRUCTURE AND ASSIGNMENTS OF THE REGISTERS
- Register Assignments
- Register Groups
- The Register Details
- Programmable Peripheral Interface PPI-X Data Register Port A
- Programmable Peripheral Interface PPI-X Data Register Port B
- Programmable Peripheral Interface PPI-X Data Register Port C
- Programmable Peripheral Interface PPI-X Command Register
- Programmable Peripheral Interface PPI-Y Data Register Port A
- Programmable Peripheral Interface PPI-Y Data Register Port B
- Programmable Peripheral Interface PPI-Y Data Register Port C
- Programmable Peripheral Interface PPI-Y Command Register
- Z1 Counter 0 Data Register
- Z1 Counter 1 Data Register
- Z1 Counter 2 Data Register
- Counter/Timer Z1 Control Register
- Z1 Counter/Timer Status Register
- Z2 Counter 0 Data Register
- Z2 Counter 1 Data Register
- Z2 Counter 2 Data Register
- Counter/Timer Z2 Control Register
- Z2 Counter/Timer Status Register
- Group Z Clock Connection Register
- Group Z Gate Connection Register
- Interrupt Source Selection Register
- Interrupt Status Register
- PROGRAMMING THE PC215E
- Copyright
- Files installed from the Distribution Diskette
- Windows DLL and Examples
- DOS 'C' Library and Examples
- Using the Dynamic Link Library
- Windows and DOS Library Functions
- Initialisation Functions
- Interrupt Control Functions
- Data Buffer Functions
- Timer/Counter Functions
- Differential Counter Functions
- Frequency Generation Functions
- Millisecond Stopwatch Functions
- Frequency Input and Output Functions
- Digitally- and Voltage-Controlled Oscillator Functions
- Digital Input/Output Functions
- Switch Scanner Matrix Functions
- Bi-Directional Data Bus Functions
- PC215E Library Error Codes
- PC215E Interface Guide For LABTECH NOTEBOOK
- Guide to User Programming
- Signal Centre
- CONTENTS
- DECLARATION OF CONFORMITY
Page
89
PC215E
6.6.8 Frequency Input and Output Functions
6.6.8.1 Measure Period of an External Signal - TCgetExtPeriod
Returns the period of an external signal, measured in microseconds. The external signal must
be connected to the clock input of the timer channel specified in the chan argument. See
section 4.2.6 for more details on the Frequency/Period Measurement application.
i = TCgetExtPeriod (h, chip, chan, fPtr)
where
h Integer. Board handle as issued by function
registerBoard.
chip Integer. Address offset of timer/counter chip
#2. One of the following pre-defined constants
may be used:
X1 = 0
X2 = 4
Y1 = 8
Y2 = 12
Z1 = 16
Z2 = 20.
chan Integer. Timer/counter channel number within
the chip (0, 1 or 2). Another timer/counter
(chan-2) will also be used to provide the gate
signal. This second timer/counter may be on
the previous chip.
fPtr Pointer to Float. Pointer to a variable declared
as a single floating-point into which the period
will be placed.
Returns Integer:
OK
or ERRHANDLE
ERRCHAN
ERRRANGE
Prior Calls registerBoard
See Also TCgetExtFreq