mirror of https://github.com/periph/devices
mcp23xxx: Add GPIO Group support (#92)
* Add GPIO Group support to mcp23xxx * Add unit tests for group * Fix unit test * add file * Fix lint errorspull/94/head
gsexton
1 year ago
committed by
GitHub
parent
d5aac04cf4
commit
5bcc204c9a
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// 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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"fmt"
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"time"
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"periph.io/x/conn/v3"
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"periph.io/x/conn/v3/gpio"
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"periph.io/x/conn/v3/pin"
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)
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// The internal structure for a group of pins.
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type pinGroup struct {
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dev *Dev
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port int
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pins []*portpin
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defaultMask gpio.GPIOValue
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}
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// Group returns a gpio.Group that is made up of the specified pins.
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func (dev *Dev) Group(port int, pins []int) *gpio.Group {
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grouppins := make([]*portpin, len(pins))
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for ix, number := range pins {
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pp, ok := dev.Pins[port][number].(*portpin)
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if !ok {
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return nil
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}
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grouppins[ix] = pp
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}
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defMask := gpio.GPIOValue((1 << len(pins)) - 1)
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var pgif interface{} = &pinGroup{dev: dev, port: port, pins: grouppins, defaultMask: defMask}
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if gpiogroup, ok := pgif.(gpio.Group); ok {
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return &gpiogroup
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}
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return nil
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}
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// Pins returns the set of pin.Pin that make up that group.
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func (pg *pinGroup) Pins() []pin.Pin {
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pins := make([]pin.Pin, len(pg.pins))
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for ix, p := range pg.pins {
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pins[ix] = p
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}
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return pins
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}
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// Given the offset within the group, return the corresponding GPIO pin.
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func (pg *pinGroup) ByOffset(offset int) pin.Pin {
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return pg.pins[offset]
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}
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// Given the specific name of a pin, return it. If it can't be found, nil is
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// returned.
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func (pg *pinGroup) ByName(name string) pin.Pin {
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for _, pin := range pg.pins {
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if pin.Name() == name {
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return pin
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}
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}
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return nil
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}
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// Given the GPIO pin number, return that pin from the set.
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func (pg *pinGroup) ByNumber(number int) pin.Pin {
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for _, pin := range pg.pins {
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if pin.Number() == number {
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return pin
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}
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}
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return nil
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}
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// Out writes value to the specified pins of the device/port. If mask is 0,
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// the default mask of all pins in the group is used.
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func (pg *pinGroup) Out(value, mask gpio.GPIOValue) error {
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if mask == 0 {
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mask = pg.defaultMask
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} else {
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mask &= pg.defaultMask
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}
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value &= mask
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// Convert the write value which is relative to the pins to the
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// absolute value for the port.
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wr := uint8(0)
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wrMask := uint8(0)
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for bit := range len(pg.pins) {
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if (mask & (1 << bit)) > 0 {
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if (value & 0x01) == 0x01 {
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wr |= 1 << pg.pins[bit].Number()
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}
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wrMask |= 1 << pg.pins[bit].Number()
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}
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value = value >> 1
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}
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port := pg.pins[0].port
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// Verify pins are set for output
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outputPins, err := port.iodir.readValue(true)
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if err != nil {
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return err
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}
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if ((outputPins ^ 0xff) & wrMask) != wrMask {
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outputPins &= (wrMask ^ 0xff)
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err = port.iodir.writeValue(outputPins, false)
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if err != nil {
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return err
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}
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}
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// Read the current value
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currentValue, err := port.olat.readValue(true)
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if err != nil {
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return err
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}
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// Apply the mask to clear bits we're writing.
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currentValue &= (0xff ^ wrMask)
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// Or the value with the bits to modify
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currentValue |= wr
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// And, write the value out the port.
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return port.olat.writeValue(currentValue, true)
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}
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// Read reads from the device and port and returns the state of the GPIO
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// pins in the group. If a pin specified by mask is not configured for
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// input, it is transparently re-configured.
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func (pg *pinGroup) Read(mask gpio.GPIOValue) (result gpio.GPIOValue, err error) {
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if mask == 0 {
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mask = pg.defaultMask
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} else {
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mask &= pg.defaultMask
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}
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// Compute the read mask
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rmask := uint8(0)
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for bit := range 8 {
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if (mask & (1 << bit)) > 0 {
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rmask |= (1 << pg.pins[bit].Number())
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}
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}
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// Make sure the direction for the pins involved in this write read is
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// Input.
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port := pg.pins[0].port
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currentIn, err := port.iodir.readValue(true)
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if err != nil {
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return
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}
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// We need to make some pins Input. Write the value to the iodir register.
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if (currentIn & rmask) != rmask {
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err = port.iodir.writeValue(currentIn|rmask, false)
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if err != nil {
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return
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}
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}
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// Now, perform the read itself.
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v, err := port.gpio.readValue(false)
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if err != nil {
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return
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}
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// Now convert the set pins into the Group value
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for ix, pin := range pg.pins {
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if (v & (1 << pin.Number())) > 0 {
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result |= 1 << ix
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}
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}
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return
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}
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// WaitForEdge listens for a GPIO pin change event. The MCP23XXXX devices
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// can't directly signal an edge event. To do this, you must call
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// Dev.SetEdgePin() with a HOST GPIO pin configured for falling edge
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// detection. That pin should be connected to the MCP23XXX INT pin. When
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// a falling edge is detected on the supplied host GPIO pin, the code
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// will return the GPIO Pin number on the device that changed.
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//
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// Note that the MCP23XXX devices only detect change. You can't configure
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// falling or rising edge. Consequently, the returned edge will always be
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// gpio.NoEdge.
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//
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// For a change event to be detected, the pin must be configured for input.
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// This function will NOT set pins for input. Additionally, the calling
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// code must set the INTCON register appropriately. Refer to the datasheet.
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//
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// In the event that the changed pin is NOT part of the io group, the
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// triggering pin number will be returned, along with the error
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// ErrPinNotInGroup
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func (pg *pinGroup) WaitForEdge(timeout time.Duration) (number int, edge gpio.Edge, err error) {
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return -1, gpio.NoEdge, gpio.ErrGroupFeatureNotImplemented
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}
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// Halt() interrupts a pending WaitForEdge() call if one is in process.
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func (pg *pinGroup) Halt() error {
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if pg.dev.edgePin != nil {
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var ifpin interface{} = pg.dev.edgePin
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if r, ok := ifpin.(conn.Resource); ok {
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return r.Halt()
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}
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}
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// TODO: I think we want to call Dev.Halt()
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return nil
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}
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// String returns the device variant name and configured pins for the group.
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func (pg *pinGroup) String() string {
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s := fmt.Sprintf("%s - [ ", pg.dev)
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for ix := range len(pg.pins) {
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s += fmt.Sprintf("%d ", pg.pins[ix].Number())
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}
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s += "]"
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return s
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}
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var _ gpio.Group = &pinGroup{}
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// 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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"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/i2ctest"
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)
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const (
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liveTest = false
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)
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func TestGroup(t *testing.T) {
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bus := i2ctest.Playback{Ops: recordingData["TestGroup"]}
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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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// The 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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// It's not important to the test, but it's nice to have a visual indicator.
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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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if liveTest {
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time.Sleep(500 * time.Millisecond)
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}
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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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// TestReadWrite exercises the group Out()/Read() functions. It's expected
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// that pin 0 of MCP23xxx port 0 is connected to pin 4 of port 0, pin 1
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// is connected to pin 5, etc...
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func TestReadWrite(t *testing.T) {
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bus := i2ctest.Playback{Ops: recordingData["TestReadWrite"]}
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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("gRead 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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if liveTest {
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time.Sleep(time.Millisecond)
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}
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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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gRead = gOut
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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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@ -0,0 +1,159 @@
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// 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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"periph.io/x/conn/v3/i2c/i2ctest"
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)
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var recordingData = map[string][]i2ctest.IO{
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"TestGroup": {
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{Addr: 0x20, W: []uint8{0x0}, R: []uint8{0x0}},
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{Addr: 0x20, W: []uint8{0x0, 0x10}},
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{Addr: 0x20, W: []uint8{0xa}, R: []uint8{0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}},
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{Addr: 0x20, W: []uint8{0xa, 0x41}},
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{Addr: 0x20, W: []uint8{0xa, 0x40}}},
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"TestReadWrite": {
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{Addr: 0x20, W: []uint8{0x0}, R: []uint8{0x10}},
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||||||
|
{Addr: 0x20, W: []uint8{0xa}, R: []uint8{0x40}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x41}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x11}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x42}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x22}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x43}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x33}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x44}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x44}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x45}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x55}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x46}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x66}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x47}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x77}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x48}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x88}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x49}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x99}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4a}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xaa}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4b}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xbb}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4c}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xcc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4d}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xdd}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4e}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xee}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xff}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0xf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x1f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x11}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x2f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x22}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x3f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x33}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x4f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x44}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x5f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x55}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x6f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x66}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x7f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x77}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x8f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x88}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x9f}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x99}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xaf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xaa}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xbf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xbb}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xcf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xcc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xdf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xdd}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xef}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xee}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xff}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xff}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0xe}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfe}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0xc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0x8}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf8}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf1}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x11}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf2}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x22}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf3}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x33}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf2}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf4}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x44}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf5}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x55}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf4}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf6}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x66}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf7}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x77}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf6}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf4}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf8}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x88}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf9}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0x99}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf8}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfa}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xaa}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfb}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xbb}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfa}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf8}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xcc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfd}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xdd}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfc}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xfe}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xee}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xff}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x9}, R: []uint8{0xff}},
|
||||||
|
{Addr: 0x20, W: []uint8{0x0, 0x0}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0xf}},
|
||||||
|
{Addr: 0x20, W: []uint8{0xa, 0x0}}},
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue