58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package spi
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import (
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"gobot.io/x/gobot/v2/drivers/common/mfrc522"
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)
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// MFRC522Driver is a wrapper for SPI bus usage. Please refer to the mfrc522.MFRC522Common package
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// for implementation details.
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type MFRC522Driver struct {
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*Driver
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*mfrc522.MFRC522Common
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}
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// NewMFRC522Driver creates a new Gobot Driver for MFRC522 RFID with SPI connection
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//
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// Params:
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//
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// a *Adaptor - the Adaptor to use with this Driver
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//
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// Optional params:
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//
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// spi.WithBusNumber(int): bus to use with this driver
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// spi.WithChipNumber(int): chip to use with this driver
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// spi.WithMode(int): mode to use with this driver
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// spi.WithBitCount(int): number of bits to use with this driver
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// spi.WithSpeed(int64): speed in Hz to use with this driver
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func NewMFRC522Driver(a Connector, options ...func(Config)) *MFRC522Driver {
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d := &MFRC522Driver{
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Driver: NewDriver(a, "MFRC522"),
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}
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d.MFRC522Common = mfrc522.NewMFRC522Common()
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d.afterStart = d.initialize
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for _, option := range options {
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option(d)
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}
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return d
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}
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func (d *MFRC522Driver) initialize() error {
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wrapper := &conWrapper{origCon: d.connection}
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return d.MFRC522Common.Initialize(wrapper)
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}
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// this is necessary due to special behavior of shift bytes and set first bit
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type conWrapper struct {
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origCon Connection
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}
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func (w *conWrapper) ReadByteData(reg uint8) (uint8, error) {
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// MSBit=1 for reading, LSBit not used for first byte (address/register)
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return w.origCon.ReadByteData(0x80 | (reg << 1))
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}
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func (w *conWrapper) WriteByteData(reg uint8, val uint8) error {
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// LSBit not used for first byte (address/register)
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return w.origCon.WriteByteData(reg<<1, val)
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}
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