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133 lines
2.8 KiB
Go
133 lines
2.8 KiB
Go
// Copyright 2025 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 mcp23xxx
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import (
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"log"
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"testing"
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"time"
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"periph.io/x/conn/v3/gpio"
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"periph.io/x/conn/v3/i2c/i2creg"
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"periph.io/x/host/v3"
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)
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func init() {
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// Make sure periph is initialized.
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if _, err := host.Init(); err != nil {
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log.Fatal(err)
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}
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}
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func TestGroup(t *testing.T) {
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// Open default I²C bus.
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bus, err := i2creg.Open("")
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if err != nil {
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log.Fatalf("failed to open I²C: %v", err)
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}
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defer bus.Close()
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extender, err := NewI2C(bus, MCP23008, 0x20)
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if err != nil {
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t.Fatal(err)
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}
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for portnum, port := range extender.Pins {
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for _, pin := range port {
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t.Logf("Port: %d Pin: %d %s", portnum, pin.Number(), pin)
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}
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}
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// My Test fixture has an led on pin 0, and also wires pin 0 -> pin 4.
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// If I don't set pin 4 for input, then it breaks the LED blinking.
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reader, _ := interface{}(extender.Pins[0][4]).(gpio.PinIn)
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_ = reader.In(gpio.PullNoChange, gpio.NoEdge)
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var ifpin interface{} = extender.Pins[0][0]
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if writer, ok := ifpin.(gpio.PinOut); ok {
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l := gpio.High
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for range 20 {
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writer.Out(l)
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l = !l
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time.Sleep(500 * time.Millisecond)
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}
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} else {
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t.Error("pin[0] not converted to gpio.PinOut!")
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}
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}
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func TestReadWrite(t *testing.T) {
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// Open default I²C bus.
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bus, err := i2creg.Open("")
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if err != nil {
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log.Fatalf("failed to open I²C: %v", err)
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}
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defer bus.Close()
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extender, err := NewI2C(bus, MCP23008, 0x20)
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if err != nil {
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t.Fatal(err)
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}
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defMask := gpio.GPIOValue(0xf)
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gOut := *extender.Group(0, []int{0, 1, 2, 3})
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if gOut == nil {
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t.Error("gOut is nil!")
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}
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gRead := *extender.Group(0, []int{4, 5, 6, 7})
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if gRead == nil {
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t.Error("gIn is nil!")
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}
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// Turn off the GPIOs
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defer gOut.Out(0, 0)
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defer gRead.Out(0, 0)
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for i := range 2 {
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if i == 1 {
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/* Now invert it. */
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x := gRead
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gRead = gOut
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gOut = x
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}
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for i := range gpio.GPIOValue(16) {
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err := gOut.Out(i, 0)
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if err != nil {
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t.Error(err)
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}
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time.Sleep(time.Millisecond)
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r, err := gRead.Read(defMask)
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if err != nil {
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t.Error(err)
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}
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if r != i {
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t.Errorf("Error reading/writing GPIO Group(). Wrote 0x%x Read 0x%x", i, r)
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}
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}
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}
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// For this test, write to the pins individually, and then
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// confirm read on the other set works as expected.
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x := gRead
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gRead = gOut
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gOut = x
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t.Log(gRead)
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pinset := extender.Pins[0][:4]
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for i := range gpio.GPIOValue(16) {
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wvalue := i
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for bit := range 4 {
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if (wvalue & (1 << bit)) == (1 << bit) {
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pinset[bit].Out(gpio.High)
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} else {
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pinset[bit].Out(gpio.Low)
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}
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}
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r, err := gRead.Read(0)
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if err != nil {
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t.Error(err)
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}
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if r != i {
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t.Errorf("Error writing GPIO pins and reading back result. Read 0x%x Expected 0x%x", r, i)
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}
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}
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}
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