44 lines
1 KiB
Go
44 lines
1 KiB
Go
// Copyright 2017 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package pipoint
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import (
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"fmt"
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"os"
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"gobot.io/x/gobot/sysfs"
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)
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const (
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path = "/dev/servoblaster"
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)
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type ServoBlaster struct {
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Pin int
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}
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// SetDuty sets the servo period in ns.
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func (s *ServoBlaster) SetDuty(period int) (err error) {
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file, err := sysfs.OpenFile(path, os.O_WRONLY, 0644)
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defer file.Close()
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if err != nil {
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return
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}
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_, err = file.Write([]byte(fmt.Sprintf("%d=%dus\n", s.Pin, period/1000)))
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return err
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}
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