79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
//go:build example
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// +build example
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//
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// Do not build by default.
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package main
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import (
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"fmt"
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"time"
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"gobot.io/x/gobot/v2"
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"gobot.io/x/gobot/v2/drivers/spi"
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"gobot.io/x/gobot/v2/platforms/adaptors"
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"gobot.io/x/gobot/v2/platforms/tinkerboard"
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)
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// Wiring
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// PWR Tinkerboard: 1 (+3.3V, VCC), 2(+5V), 6, 9, 14, 20 (GND)
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// GPIO-SPI Tinkerboard (same as SPI2): 23 (CLK), 19 (TXD), 21 (RXD), 24 (CSN0)
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// MFRC522 plate: VCC, GND, SCK (CLK), MOSI (->TXD), MISO (->RXD), NSS/SDA (CSN0/CSN1?)
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const (
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sclk = "23"
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nss = "24"
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mosi = "19"
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miso = "21"
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speedHz = 5000 // more than 15kHz is not possible with GPIO's, so we choose 5kHz
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)
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func main() {
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a := tinkerboard.NewAdaptor(adaptors.WithSpiGpioAccess(sclk, nss, mosi, miso))
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d := spi.NewMFRC522Driver(a, spi.WithSpeed(speedHz))
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wasCardDetected := false
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const textToCard = "Hello RFID user!\nHey, we use GPIO's for SPI."
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work := func() {
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if err := d.PrintReaderVersion(); err != nil {
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fmt.Println("get version err:", err)
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}
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gobot.Every(2*time.Second, func() {
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if !wasCardDetected {
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fmt.Println("\n+++ poll for card +++")
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if err := d.IsCardPresent(); err != nil {
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fmt.Println("no card found")
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} else {
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fmt.Println("\n+++ write card +++")
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err := d.WriteText(textToCard)
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if err != nil {
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fmt.Println("write err:", err)
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}
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wasCardDetected = true
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}
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} else {
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fmt.Println("\n+++ read card +++")
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text, err := d.ReadText()
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if err != nil {
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fmt.Println("read err:", err)
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wasCardDetected = false
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} else {
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fmt.Printf("-- start text --\n%s\n-- end text --\n", text)
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}
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}
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})
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}
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robot := gobot.NewRobot("gpioSpiBot",
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[]gobot.Connection{a},
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[]gobot.Device{d},
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work,
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)
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robot.Start()
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}
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