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mcp23017: implement pin toggling

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Also add an example for using multiple devices.
This commit is contained in:
Roger Peppe
2020-08-24 11:55:00 +01:00
committed by Ron Evans
parent edf9ba92be
commit ce5e443084
6 changed files with 146 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mcp23017/device_test.go
+37
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@@ -50,6 +50,25 @@ func TestSetPins(t *testing.T) {
c.Assert(pins, qt.Equals, Pins(0b01010000_00011010))
}
func TestTogglePins(t *testing.T) {
c := qt.New(t)
bus := newBus(c)
fdev := bus.addDevice(0x20)
fdev.Registers[rGPIO] = 0b00001111
fdev.Registers[rGPIO|portB] = 0b11110000
dev, err := NewI2C(bus, 0x20)
c.Assert(err, qt.IsNil)
pins, err := dev.GetPins()
c.Assert(err, qt.IsNil)
c.Assert(pins, qt.Equals, Pins(0b11110000_00001111))
err = dev.TogglePins(0b10101010_01010101)
c.Assert(err, qt.IsNil)
pins, err = dev.GetPins()
c.Assert(err, qt.IsNil)
c.Assert(pins, qt.Equals, Pins(0b01011010_01011010))
}
func TestSetGetModes(t *testing.T) {
c := qt.New(t)
bus := newBus(c)
@@ -108,6 +127,24 @@ func TestPinSetGet(t *testing.T) {
c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0))
}
func TestPinToggle(t *testing.T) {
c := qt.New(t)
bus := newBus(c)
fdev := bus.addDevice(0x20)
dev, err := NewI2C(bus, 0x20)
c.Assert(err, qt.IsNil)
pin := dev.Pin(1)
v, err := pin.Get()
c.Assert(err, qt.Equals, nil)
c.Assert(v, qt.Equals, false)
err = pin.Toggle()
c.Assert(err, qt.Equals, nil)
c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0b10))
err = pin.Toggle()
c.Assert(err, qt.Equals, nil)
c.Assert(fdev.Registers[rGPIO], qt.Equals, uint8(0))
}
func TestPinMode(t *testing.T) {
c := qt.New(t)
bus := newBus(c)