96 lines
2.2 KiB
Go
96 lines
2.2 KiB
Go
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// Copyright 2018 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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// Package green implements headers for the BeagleBone Green and BeagleBone
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// Green Wireless micro-computers.
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//
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// Reference
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//
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// https://beagleboard.org/green
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//
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// https://beagleboard.org/green-wireless
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//
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// Datasheet
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//
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// http://wiki.seeedstudio.com/BeagleBone_Green/
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package green
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import (
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"errors"
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"strings"
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"periph.io/x/periph"
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"periph.io/x/periph/conn/gpio"
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"periph.io/x/periph/conn/pin"
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"periph.io/x/periph/conn/pin/pinreg"
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"periph.io/x/periph/host/distro"
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"periph.io/x/periph/host/sysfs"
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)
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// Headers found on BeagleBone Green.
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var (
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// I2C Groove port.
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I2C_SCL gpio.PinIO = gpio.INVALID // GPIO13, I2C2_SCL, UART1_RTS, SPI1_CS1
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I2C_SDA gpio.PinIO = gpio.INVALID // GPIO12, I2C2_SDA, UART1_CTS, SPI1_CS0
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// UART Groove port connected to UART2.
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UART_TX gpio.PinIO = gpio.INVALID // GPIO3, EHRPWM0B, I2C2_SCL, UART2_TX, SPI0_MISO
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UART_RX gpio.PinIO = gpio.INVALID // GPIO2, EHRPWM0A, I2C2_SDA, UART2_RX, SPI0_CLK
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)
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// Present returns true if the host is a BeagleBone Green or BeagleBone Green
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// Wireless.
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func Present() bool {
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if isArm {
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return strings.HasPrefix(distro.DTModel(), "TI AM335x BeagleBone Green")
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}
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return false
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}
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// driver implements periph.Driver.
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type driver struct {
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}
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func (d *driver) String() string {
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return "beaglebone-green"
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}
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func (d *driver) Prerequisites() []string {
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return []string{"am335x"}
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}
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func (d *driver) After() []string {
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return nil
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}
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func (d *driver) Init() (bool, error) {
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if !Present() {
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return false, errors.New("BeagleBone Green board not detected")
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}
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I2C_SDA = sysfs.Pins[12]
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I2C_SCL = sysfs.Pins[13]
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hdr := [][]pin.Pin{{pin.GROUND}, {pin.V3_3}, {I2C_SDA}, {I2C_SCL}}
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if err := pinreg.Register("I2C", hdr); err != nil {
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return true, err
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}
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UART_TX = sysfs.Pins[3]
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UART_RX = sysfs.Pins[2]
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hdr = [][]pin.Pin{{pin.GROUND}, {pin.V3_3}, {UART_TX}, {UART_RX}}
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if err := pinreg.Register("UART", hdr); err != nil {
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return true, err
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}
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return true, nil
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}
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func init() {
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if isArm {
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periph.MustRegister(&drv)
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}
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}
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var drv driver
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