mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-07-26 10:38:41 +00:00
Roger Peppe
211 lines
6.1 KiB
Go
211 lines
6.1 KiB
Go
package mcp23017
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import (
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"fmt"
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"testing"
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qt "github.com/frankban/quicktest"
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)
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func TestGetPins(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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fdev.Registers[rGPIO] = 0b10101100
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fdev.Registers[rGPIO|portB] = 0b01010011
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pins, err := dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b01010011_10101100))
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}
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func TestSetPins(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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fdev.Registers[rGPIO] = 0b00001111
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fdev.Registers[rGPIO|portB] = 0b11110000
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pins, err := dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b11110000_00001111))
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err = dev.SetPins(0b01100000_00110000, 0b10101010_01010101)
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c.Assert(err, qt.IsNil)
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pins, err = dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b01110000_0001_1010))
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// The logic uses the cached value of the pins rather than
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// reading it from the registers each time.
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fdev.Registers[rGPIO] = 0
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fdev.Registers[rGPIO|portB] = 0
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err = dev.SetPins(0b01000000_00110000, 0b01100000_00000000)
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c.Assert(err, qt.IsNil)
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pins, err = dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b01010000_00011010))
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}
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func TestTogglePins(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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fdev.Registers[rGPIO] = 0b00001111
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fdev.Registers[rGPIO|portB] = 0b11110000
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pins, err := dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b11110000_00001111))
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err = dev.TogglePins(0b10101010_01010101)
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c.Assert(err, qt.IsNil)
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pins, err = dev.GetPins()
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c.Assert(err, qt.IsNil)
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c.Assert(pins, qt.Equals, Pins(0b01011010_01011010))
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}
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func TestSetGetModes(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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// Calling SetModes with less items in than there are
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// pins should use the last item for all the unspecified ones.
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err = dev.SetModes([]PinMode{Input | Invert, Output})
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c.Assert(err, qt.IsNil)
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c.Assert(fdev.Registers[rIODIR], qt.Equals, uint8(0b00000001))
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c.Assert(fdev.Registers[rIOPOL], qt.Equals, uint8(0b00000001))
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c.Assert(fdev.Registers[rGPPU], qt.Equals, uint8(0))
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modes := make([]PinMode, 17)
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err = dev.GetModes(modes)
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c.Assert(err, qt.IsNil)
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c.Assert(modes[0], qt.Equals, Input|Invert)
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for i, m := range modes[1:16] {
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c.Assert(m, qt.Equals, Output, qt.Commentf("index %d", i))
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}
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c.Assert(modes[16], qt.Equals, PinMode(0))
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// Using an empty slice should reset all the modes to the initial state.
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err = dev.SetModes(nil)
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c.Assert(err, qt.IsNil)
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c.Assert(fdev.Registers[rIODIR], qt.Equals, uint8(0b11111111))
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c.Assert(fdev.Registers[rIOPOL], qt.Equals, uint8(0))
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c.Assert(fdev.Registers[rGPPU], qt.Equals, uint8(0))
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}
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func TestPinSetGet(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pin := dev.Pin(1)
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v, err := pin.Get()
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c.Assert(err, qt.Equals, nil)
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c.Assert(v, qt.Equals, false)
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err = pin.Set(true)
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0b10))
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v, err = pin.Get()
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c.Assert(err, qt.Equals, nil)
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c.Assert(v, qt.Equals, true)
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err = pin.Set(false)
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0))
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err = pin.High()
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0b10))
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err = pin.Low()
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0))
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}
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func TestPinToggle(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pin := dev.Pin(1)
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v, err := pin.Get()
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c.Assert(err, qt.Equals, nil)
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c.Assert(v, qt.Equals, false)
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err = pin.Toggle()
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0b10))
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err = pin.Toggle()
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c.Assert(err, qt.Equals, nil)
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c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0))
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}
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func TestPinMode(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.IsNil)
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pin := dev.Pin(1)
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mode, err := pin.GetMode()
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c.Assert(err, qt.IsNil)
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c.Assert(mode, qt.Equals, PinMode(0))
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c.Assert(mode&Direction, qt.Equals, Input)
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err = pin.SetMode(Input | Pullup | Invert)
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c.Assert(err, qt.IsNil)
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c.Assert(fdev.Registers[rIODIR], qt.Equals, uint8(0b11111111))
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c.Assert(fdev.Registers[rIOPOL], qt.Equals, uint8(0b10))
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c.Assert(fdev.Registers[rGPPU], qt.Equals, uint8(0b10))
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mode, err = pin.GetMode()
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c.Assert(err, qt.IsNil)
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c.Assert(mode, qt.Equals, Input|Pullup|Invert)
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// Set another pin to output.
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err = dev.Pin(2).SetMode(Output)
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c.Assert(err, qt.IsNil)
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c.Assert(fdev.Registers[rIODIR], qt.Equals, uint8(0b11111011))
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c.Assert(fdev.Registers[rIOPOL], qt.Equals, uint8(0b10))
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c.Assert(fdev.Registers[rGPPU], qt.Equals, uint8(0b10))
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// Check that changing a pin in port B works too.
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err = dev.Pin(8).SetMode(Output)
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c.Assert(err, qt.IsNil)
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c.Assert(fdev.Registers[rIODIR], qt.Equals, uint8(0b11111011))
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c.Assert(fdev.Registers[rIODIR|portB], qt.Equals, uint8(0b11111110))
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c.Assert(fdev.Registers[rIOPOL], qt.Equals, uint8(0b10))
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c.Assert(fdev.Registers[rIOPOL|portB], qt.Equals, uint8(0))
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c.Assert(fdev.Registers[rGPPU], qt.Equals, uint8(0b10))
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c.Assert(fdev.Registers[rGPPU|portB], qt.Equals, uint8(0))
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}
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func TestPins(t *testing.T) {
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c := qt.New(t)
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var p Pins
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p.Set(1, true)
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c.Assert(p, qt.Equals, Pins(0b10))
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c.Assert(p.Get(1), qt.Equals, true)
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c.Assert(p.Get(0), qt.Equals, false)
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c.Assert(p.Get(16), qt.Equals, false)
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p.High(2)
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c.Assert(p, qt.Equals, Pins(0b110))
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p.Low(1)
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c.Assert(p, qt.Equals, Pins(0b100))
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}
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func TestInitWithError(t *testing.T) {
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c := qt.New(t)
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bus := newBus(c)
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fdev := bus.addDevice(0x20)
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fdev.Err = fmt.Errorf("some error")
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dev, err := NewI2C(bus, 0x20)
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c.Assert(err, qt.ErrorMatches, `cannot initialize mcp23017 device at 0x20: some error`)
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c.Assert(dev, qt.IsNil)
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}
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