mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-08-07 08:23:42 +00:00
Ayke van Laethem
16d2b71820
These constants were always a bit weird:
* they use an uncommon name (TWI instead of I2C)
* they don't follow Go naming conventions (CamelCase)
* the constants don't provide much value: their name is their value
(100KHZ => 100e3).
Therefore, I propose we remove them and replace them with regular
numeric constants.
46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
// This example demonstrates putting several mcp23017 devices together into
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// a single virtual I/O array.
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package main
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import (
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"machine"
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"tinygo.org/x/drivers/mcp23017"
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)
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func main() {
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err := machine.I2C0.Configure(machine.I2CConfig{
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Frequency: 400e3,
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})
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if err != nil {
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panic(err)
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}
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// Assume the devices are at addresses 0x20, 0x21
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dev, err := mcp23017.NewI2CDevices(machine.I2C0, 0x20, 0x21)
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if err != nil {
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panic(err)
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}
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// Configure pin 0 for input and all the others for output.
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if err := dev.SetModes([]mcp23017.PinMode{
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mcp23017.Input | mcp23017.Pullup,
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mcp23017.Output,
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}); err != nil {
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panic(err)
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}
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input := dev.Pin(0)
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// Make a mask that represents all the output pins.
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// Note that this leverages the driver behaviour which replicates the highest bit in
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// the last slice element (1 in this case) to all other pins
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outputMask := mcp23017.PinSlice{^mcp23017.Pins(1 << 0)} // All except pin 0
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inputVal, err := input.Get()
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if err != nil {
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panic(err)
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}
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println("input value: ", inputVal)
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// Set the values of all the output pins.
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err = dev.SetPins(mcp23017.PinSlice{0b1011011_01101110, 0b11111101_11100110}, outputMask)
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if err != nil {
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panic(err)
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}
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}
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