94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
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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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"reflect"
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"time"
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"gobot.io/x/gobot"
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"gobot.io/x/gobot/drivers/i2c"
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"gobot.io/x/gobot/platforms/raspi"
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)
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// Wiring
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// PWR Raspi: 1 (+3.3V, VCC), 6, 9, 14, 20 (GND)
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// I2C1 Raspi: 3 (SDA), 5 (SCL)
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// PCA9501: 20 (VDD, +2.5..3.6V), 10 (VSS, GND), 19 (SDA), 18 (SCL)
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// HW address pins: 1 (A0), 2 (A1), 3 (A2), 12 (A3), 11 (A4), 9 (A5)
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func main() {
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const (
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defaultAddress = 0x7F // with open address pins (internal pull-up)
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myAddress = 0x44 // needs to be adjusted for your configuration
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eepromAddr = uint8(0x02)
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dataLen = 7
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write = true
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read = true
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)
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board := raspi.NewAdaptor()
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drv := i2c.NewGenericDriver(board, "PCA9501-EEPROM", defaultAddress, i2c.WithAddress(myAddress))
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var valWr uint8 = 0x09
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var err error
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wData := make([]byte, dataLen)
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rData := make([]byte, dataLen)
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work := func() {
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gobot.Every(500*time.Millisecond, func() {
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// write "dataLen" values, starting by EEPROM address
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valWr++
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if write {
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for i := range wData {
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wData[i] = byte(i) + valWr
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}
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err = drv.WriteBlockData(eepromAddr, wData)
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if err != nil {
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fmt.Println("err write:", err)
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} else if read != write {
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fmt.Printf("EEPROM addr: %d, wr: %v\n", eepromAddr, wData)
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}
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}
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// write process needs some time, so wait at least 5ms before read a value
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// when decreasing to much, the check below will fail
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time.Sleep(10 * time.Millisecond)
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if read {
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err = drv.ReadBlockData(eepromAddr, rData)
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if err != nil {
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fmt.Println("err read:", err)
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} else if read != write {
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fmt.Printf("EEPROM addr: %d, rd: %v\n", eepromAddr, rData)
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}
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}
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// compare read and write
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if read && write {
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if reflect.DeepEqual(wData, rData) {
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fmt.Printf("EEPROM addr: %d equal: %v\n", eepromAddr, rData)
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} else {
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fmt.Printf("EEPROM addr: %d wr: %v differ rd: %v\n", eepromAddr, wData, rData)
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}
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}
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})
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}
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robot := gobot.NewRobot("genericDriverI2c",
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[]gobot.Connection{board},
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[]gobot.Device{drv},
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work,
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)
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err = robot.Start()
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if err != nil {
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fmt.Println(err)
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}
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}
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