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ZBasic System Library
178
ZX Microcontroller Family
frequency and may be used when the PWM frequency will be changed in the midst of PWM signal
generation. Frequency changes are effected by making additional calls to OpenPWM() and the change is
synchronized so that it takes effect at the beginning of a cycle.
The status parameter, if supplied, receives a value to indicate success or failure of the call.
A side effect of calling OpenPWM() is that the timer busy flag for the underlying timer (e.g.
Register.Timer1Busy) will be set to True irrespective of its prior state. It is recommended that the
initial call to OpenPWM() be preceded by a call to acquire the semaphore for the timer. This will ensure
that an existing timer operation will not be disturbed.
Example
Call OpenPWM(1, 50.0, zxFastPWM) 'prepare for 50Hz Fast PWM using channel 1
Compatibility
This subroutine is not available in BasicX compatibility mode.
See Also
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