k8055m_set_pwm_out, k80ffm_get_pwm_out -- Set/get the duty cycle of a pwm output port.
k8055-pic18f access library
#include "k8055m.h"
int
k8055m_set_pwm_out(int cardNumber, int port, int value);
int
k8055m_get_pwm_out(int cardNumber, int port);
k8055m_set_pwm_out() sets the duty cycle of pwm output port port
to value.
ports are numbered 0 .. 1. The value is the theoretically possible 10 bit duty
cycle in the range of 0 .. 1023. In the current firmware implementation, the duty
cycle has only 9 bits resolution and the value is scaled down (divided by two) inside
of the library.
The call only has an effect if the output port is currently
configured to normal mode. The call is ignored otherwise.
If the card's auto-flush feature is turned off, then a call to k8055m_set_pwm_out()
will not be sent to the card and the resulting
changes will be accumulated until k8055m_flush() is called or the card's auto-flush
feature is enabled.
The k8055-pic18f modified card retains its output port states while the USB is disconnected,
as long as it keeps running on a powered USB hub or similar power supply. k8055m_open()
actually queries the card for its current configuration and output port settings.
k8055m_get_pwm_out() returns those initial
or the latest requested duty cycle.
k8055m_set_pwm_out() returns 0 on success, -1 on error. k8055m_get_pwm_out() returns the current duty cycle or -1 on error.