Documentation
¶
Overview ¶
Package mmr defines helpers to interact with devices exposing Memory Mapped Registers protocol.
The protocol is defined two supported commands:
- Write Address, Read Value
- Write Address, Write Value
Index ¶
- type Dev16
- func (d *Dev16) ReadStruct(reg uint16, b interface{}) error
- func (d *Dev16) ReadUint16(reg uint16) (uint16, error)
- func (d *Dev16) ReadUint32(reg uint16) (uint32, error)
- func (d *Dev16) ReadUint64(reg uint16) (uint64, error)
- func (d *Dev16) ReadUint8(reg uint16) (uint8, error)
- func (d *Dev16) String() string
- func (d *Dev16) WriteStruct(reg uint16, b interface{}) error
- func (d *Dev16) WriteUint16(reg uint16, v uint16) error
- func (d *Dev16) WriteUint32(reg uint16, v uint32) error
- func (d *Dev16) WriteUint64(reg uint16, v uint64) error
- func (d *Dev16) WriteUint8(reg uint16, v uint8) error
- type Dev8
- func (d *Dev8) ReadStruct(reg uint8, b interface{}) error
- func (d *Dev8) ReadUint16(reg uint8) (uint16, error)
- func (d *Dev8) ReadUint32(reg uint8) (uint32, error)
- func (d *Dev8) ReadUint64(reg uint8) (uint64, error)
- func (d *Dev8) ReadUint8(reg uint8) (uint8, error)
- func (d *Dev8) String() string
- func (d *Dev8) WriteStruct(reg uint8, b interface{}) error
- func (d *Dev8) WriteUint16(reg uint8, v uint16) error
- func (d *Dev8) WriteUint32(reg uint8, v uint32) error
- func (d *Dev8) WriteUint64(reg uint8, v uint64) error
- func (d *Dev8) WriteUint8(reg uint8, v uint8) error
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Dev16 ¶
type Dev16 struct {
Conn conn.Conn
// Order specifies the binary encoding of words. It is expected to be either
// binary.BigEndian or binary.LittleEndian or a specialized implemented if
// necessary. A good example of such need is devices communicating 32bits
// little endian values encoded over 16bits big endian words.
Order binary.ByteOrder
}
Dev16 is a Dev that exposes memory mapped registers in a 16bits address space.
func (*Dev16) ReadStruct ¶
ReadStruct writes the register number to the connection, then reads the data into `b` and marshall it via `.Order` as appropriate.
It is expected to be called with a slice of integers, slice of structs, pointer to an integer or to a struct.
func (*Dev16) ReadUint16 ¶
ReadUint16 reads a 16 bit register.
func (*Dev16) ReadUint32 ¶
ReadUint32 reads a 32 bit register.
func (*Dev16) ReadUint64 ¶
ReadUint64 reads a 64 bit register.
func (*Dev16) WriteStruct ¶
WriteStruct writes the register number to the connection, then the data `b` marshalled via `.Order` as appropriate.
It is expected to be called with a slice of integers, slice of structs, pointer to an integer or to a struct.
func (*Dev16) WriteUint16 ¶
WriteUint16 writes a 16 bit register.
func (*Dev16) WriteUint32 ¶
WriteUint32 writes a 32 bit register.
func (*Dev16) WriteUint64 ¶
WriteUint64 writes a 64 bit register.
type Dev8 ¶
type Dev8 struct {
Conn conn.Conn
// Order specifies the binary encoding of words. It is expected to be either
// binary.BigEndian or binary.LittleEndian or a specialized implemented if
// necessary. A good example of such need is devices communicating 32bits
// little endian values encoded over 16bits big endian words.
Order binary.ByteOrder
}
Dev8 is a connection that exposes memory mapped registers in a 8bit address space.
Example ¶
package main
import (
"encoding/binary"
"fmt"
"log"
"periph.io/x/periph/conn/i2c"
"periph.io/x/periph/conn/i2c/i2creg"
"periph.io/x/periph/conn/mmr"
"periph.io/x/periph/host"
)
func main() {
// Make sure periph is initialized.
if _, err := host.Init(); err != nil {
log.Fatal(err)
}
// Open a connection, using I²C as an example:
b, err := i2creg.Open("")
if err != nil {
log.Fatal(err)
}
defer b.Close()
c := &i2c.Dev{Bus: b, Addr: 0xD0}
d := mmr.Dev8{Conn: c, Order: binary.BigEndian}
v, err := d.ReadUint8(0xD0)
if err != nil {
log.Fatal(err)
}
if v == 0x60 {
fmt.Printf("Found bme280 on bus %s\n", b)
}
}
Output:
func (*Dev8) ReadStruct ¶
ReadStruct writes the register number to the connection, then reads the data into `b` and marshall it via `.Order` as appropriate.
It is expected to be called with a slice of integers, slice of structs, pointer to an integer or to a struct.
Example ¶
package main
import (
"encoding/binary"
"log"
"periph.io/x/periph/conn/i2c"
"periph.io/x/periph/conn/i2c/i2creg"
"periph.io/x/periph/conn/mmr"
"periph.io/x/periph/host"
)
func main() {
// Make sure periph is initialized.
if _, err := host.Init(); err != nil {
log.Fatal(err)
}
// Open a connection, using I²C as an example:
b, err := i2creg.Open("")
if err != nil {
log.Fatal(err)
}
defer b.Close()
c := &i2c.Dev{Bus: b, Addr: 0xD0}
d := mmr.Dev8{Conn: c, Order: binary.BigEndian}
flags := struct {
Flag16 uint16
Flag8 [2]uint8
}{}
if err = d.ReadStruct(0xD0, &flags); err != nil {
log.Fatal(err)
}
// Use flags.Flag16 and flags.Flag8.
}
Output:
func (*Dev8) ReadUint16 ¶
ReadUint16 reads a 16 bit register.
func (*Dev8) ReadUint32 ¶
ReadUint32 reads a 32 bit register.
func (*Dev8) ReadUint64 ¶
ReadUint64 reads a 64 bit register.
func (*Dev8) WriteStruct ¶
WriteStruct writes the register number to the connection, then the data `b` marshalled via `.Order` as appropriate.
It is expected to be called with a slice of integers, slice of structs, pointer to an integer or to a struct.
Example ¶
package main
import (
"encoding/binary"
"log"
"periph.io/x/periph/conn/mmr"
"periph.io/x/periph/conn/onewire"
"periph.io/x/periph/conn/onewire/onewirereg"
"periph.io/x/periph/host"
)
func main() {
// Make sure periph is initialized.
if _, err := host.Init(); err != nil {
log.Fatal(err)
}
// Open a connection, using 1-wire as an example:
b, err := onewirereg.Open("")
if err != nil {
log.Fatal(err)
}
defer b.Close()
c := &onewire.Dev{Bus: b, Addr: 0xD0}
d := mmr.Dev8{Conn: c, Order: binary.LittleEndian}
flags := struct {
Flag16 uint16
Flag8 [2]uint8
}{
0x1234,
[2]uint8{1, 2},
}
if err = d.WriteStruct(0xD0, &flags); err != nil {
log.Fatal(err)
}
}
Output:
func (*Dev8) WriteUint16 ¶
WriteUint16 writes a 16 bit register.
func (*Dev8) WriteUint32 ¶
WriteUint32 writes a 32 bit register.
func (*Dev8) WriteUint64 ¶
WriteUint64 writes a 64 bit register.
Source Files