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pca9685: default the freq to 490 Hz

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This commit is contained in:
Karan Misra 2014-01-10 07:36:01 +05:30
parent a80a1701bf
commit 043867e1f5
1 changed files with 5 additions and 0 deletions
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5
controller/pca9685/pca9685.go
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@ -22,6 +22,8 @@ const (
minAnalogValue = 0 minAnalogValue = 0
maxAnalogValue = 255 maxAnalogValue = 255
defaultFreq = 490
) )
// PCA9685 represents a PCA9685 PWM generator. // PCA9685 represents a PCA9685 PWM generator.
@ -72,6 +74,9 @@ func (d *PCA9685) setup() (err error) {
return return
} }
if d.Freq == 0 {
d.Freq = defaultFreq
}
preScaleValue := byte(math.Floor(float64(clockFreq/(pwmControlPoints*d.Freq))+float64(0.5)) - 1) preScaleValue := byte(math.Floor(float64(clockFreq/(pwmControlPoints*d.Freq))+float64(0.5)) - 1)
if d.Debug { if d.Debug {
log.Printf("pca9685: calculated prescale value = %#02x", preScaleValue) log.Printf("pca9685: calculated prescale value = %#02x", preScaleValue)