github.com/usbarmory/tamago@v0.0.0-20240508072735-8612bbe1e454/board/raspberrypi/pi2/led.go (about) 1 // Raspberry Pi 2 LED support 2 // https://github.com/usbarmory/tamago 3 // 4 // Copyright (c) the pi2 package authors 5 // 6 // Use of this source code is governed by the license 7 // that can be found in the LICENSE file. 8 9 package pi2 10 11 import ( 12 "errors" 13 14 "github.com/usbarmory/tamago/soc/bcm2835" 15 ) 16 17 // LED GPIO lines 18 const ( 19 // Activity LED 20 ACTIVITY = 0x2f 21 // Power LED 22 POWER = 0x23 23 ) 24 25 var activity *bcm2835.GPIO 26 var power *bcm2835.GPIO 27 28 func init() { 29 var err error 30 31 activity, err = bcm2835.NewGPIO(ACTIVITY) 32 33 if err != nil { 34 panic(err) 35 } 36 37 power, err = bcm2835.NewGPIO(POWER) 38 39 if err != nil { 40 panic(err) 41 } 42 43 activity.Out() 44 power.Out() 45 } 46 47 // LED turns on/off an LED by name. 48 func (b *board) LED(name string, on bool) (err error) { 49 var led *bcm2835.GPIO 50 51 switch name { 52 case "activity", "Activity", "ACTIVITY": 53 led = activity 54 case "power", "Power", "POWER": 55 led = power 56 default: 57 return errors.New("invalid LED") 58 } 59 60 if on { 61 led.High() 62 } else { 63 led.Low() 64 } 65 66 return 67 }