reinbert/pca9685

This software is a devLib extension to wiringPi http://wiringpi.com/ and enables it to control the Adafruit PCA9685 16-Channel 12-bit PWM/Servo Driver http://www.adafruit.com/products/815 via I2C interface.

pca9685's Issues

Examples do not run

Hello,
most of the example programms do not run because wiringPi is not initialisied

Neuroplant

prescaler value rounds down so frequency rounds up, so frequency can be too high

pca9685/src/pca9685.c

Line 104 in 9f023c7

int prescale = (int)(25000000.0f / (4096 * freq) - 0.5f);

I replaced it with
ceil((25E6/4096) /freq) -1

This also removes one multiplication (although multiplying by 4096 is just shifting, but hey it is something).
This requires including math.h and linking against -lm.
An alternative would be:

#define CEILING(X) (X-(int)(X) > 0 ? (int)(X+1) : (int)(X))
CEILING((25E6/4096) /freq) -1