spi

package
v0.11.0 Latest Latest
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 Go to latest Published: Aug 3, 2022 License: BSD-3-Clause Imports: 10 Imported by: 0

Documentation

Overview

Package spi provides unified way to configure/use SPI peripherals. It also provides a driver for synchronous I/O.

Index

Constants

View Source 
const (
	CPHA0  = Config(0)    // Sample on leading edge.
	CPHA1  = Config(cpha) // Sample on trailing edge.
	CPOL0  = Config(0)    // Clock idle state is 0.
	CPOL1  = Config(cpol) // Clock idle state is 1.
	Slave  = Config(0)    // Slave mode.
	Master = Config(mstr) // Master mode.

	BR2   = Config(0)        // Baud rate = PCLK/2
	BR4   = Config(1 << brn) // Baud rate = PCLK/4.
	BR8   = Config(2 << brn) // Baud rate = PCLK/8.
	BR16  = Config(3 << brn) // Baud rate = PCLK/16.
	BR32  = Config(4 << brn) // Baud rate = PCLK/32.
	BR64  = Config(5 << brn) // Baud rate = PCLK/64.
	BR128 = Config(6 << brn) // Baud rate = PCLK/128.
	BR256 = Config(7 << brn) // Baud rate = PCLK/256.

	MSBF = Config(0)        // Most significant bit first.
	LSBF = Config(lsbfirst) // Least significant bit first.

	HardSS = Config(0)   // Hardware slave select.
	SoftSS = Config(ssm) // Software slave select (use ISSLow, ISSHigh).

	ISSLow  = Config(0)   // Set NSS internally to low (used with SoftSS).
	ISSHigh = Config(ssi) // Set NSS internally to high (used with SoftSS).

	SSInp = Config(0)          // Set NSS as input (used with HardSS).
	SSOut = Config(ssoe << 16) // set NSS as output (used with HardSS).

	ThreeWire = Config(0)        // Three-wire mode (SCK, MOSI, MISO).
	TwoWire   = Config(bidimode) // Two-wire mode (SCK, MOSI/MISO).

	TxRx   = Config(0)      // Three-wire transimt and receive.
	RxOnly = Config(rxonly) // Three-wire receive only.

	Rx = Config(0)      // Two-wire receive-only.
	Tx = Config(bidioe) // Two-wire transmit-only.

)
View Source 
const (
	Err        = Event(1)         // Some hardware error occurs.
	RxNotEmpty = Event(rxne) << 1 // Receive buffer not empty.
	TxEmpty    = Event(txe) << 1  // Transmit buffer empty.
	Busy       = Event(bsy) << 1  // Periph is busy (not a real event).

)
View Source 
const (
	ErrCRC     = Error(crcerr >> 3)
	ErrMode    = Error(modf >> 3)
	ErrOverrun = Error(ovr >> 3)
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Config added in v0.2.1 

type Config uint32

type Driver 

type Driver struct {
	// contains filtered or unexported fields
}

Driver implements DMA based driver to an SPI peripheral working in master mode.

func NewDriver 

func NewDriver(p *Periph, rxdma, txdma dma.Channel) *Driver

NewDriver provides convenient way to create heap allocated Driver struct.

func (*Driver) DMAISR 

func (d *Driver) DMAISR(ch dma.Channel)

func (*Driver) Disable added in v0.2.1 

func (d *Driver) Disable()

Disable waits for the peripheral idle state and calls d.Periph().Disable().

func (*Driver) Enable added in v0.2.1 

func (d *Driver) Enable()

Enable calls d.Periph().Enable().

func (*Driver) Err 

func (d *Driver) Err(clear bool) error

Err returns the saved error and clears it if the clear is true. If an error occurs during any command it is saved and the subsequent commands are ignored until the error is cleared.

func (*Driver) ISR 

func (d *Driver) ISR()

func (*Driver) Periph 

func (d *Driver) Periph() *Periph

Periph returns the SPI peripheral used by Driver.

func (*Driver) RxDMA 

func (d *Driver) RxDMA() dma.Channel

func (*Driver) SetBaudrate added in v0.2.1 

func (d *Driver) SetBaudrate(baudrate int)

SetBaudrate calls d.Periph().SetBaudrate(baudrate).

func (*Driver) SetWordSize added in v0.2.1 

func (d *Driver) SetWordSize(size int)

SetWordSize calls d.Periph().SetWordSize(size).

func (*Driver) Setup added in v0.2.1 

func (d *Driver) Setup(conf Config, baudrate int)

Setup enables clock source, resets peripheral, then calls d.Periph().SetConfig(conf, baudrate) to configure it.

func (*Driver) TwoWireSetRx added in v0.2.1 

func (d *Driver) TwoWireSetRx()

TwoWireSetRx can be used in two-wire mode to set data direction to recevie.

func (*Driver) TwoWireSetTx added in v0.2.1 

func (d *Driver) TwoWireSetTx()

TwoWireSetRx can be used in two-wire mode to set data direction to transimit.

func (*Driver) TxDMA 

func (d *Driver) TxDMA() dma.Channel

func (*Driver) UsePinMaster added in v0.7.1 

func (d *Driver) UsePinMaster(pin gpio.Pin, sig Signal)

UsePinMaster is a helper function that can be used to configure GPIO pins as required by SPI master device. Only certain pins can be used (see datasheet).

func (*Driver) UsePinSlave added in v0.7.1 

func (d *Driver) UsePinSlave(pin gpio.Pin, sig Signal)

UsePinSlave is a helper function that can be used to configure GPIO pins as required by SPI slave device. Only certain pins can be used (see datasheet).

func (*Driver) WriteByteN added in v0.9.0 

func (d *Driver) WriteByteN(b byte, n int)

func (*Driver) WriteRead 

func (d *Driver) WriteRead(out, in []byte) int

func (*Driver) WriteRead16 

func (d *Driver) WriteRead16(out, in []uint16) int

func (*Driver) WriteReadByte 

func (d *Driver) WriteReadByte(b byte) byte

WriteReadByte writes and reads byte.

func (*Driver) WriteReadWord16 

func (d *Driver) WriteReadWord16(w uint16) uint16

WriteReadWord16 writes and reads 16-bit word.

func (*Driver) WriteStringRead 

func (d *Driver) WriteStringRead(out string, in []byte) int

func (*Driver) WriteWord16N added in v0.9.0 

func (d *Driver) WriteWord16N(w uint16, n int)

type Error 

type Error uint8

Error is a bitfield that encodes possible peripheral errors.

func (Error) Error 

func (e Error) Error() string

type Event 

type Event uint16

Event is a bitfield that encodes possible peripheral events.

type Periph 

type Periph struct {
	// contains filtered or unexported fields
}

Periph represents SPI peripheral.

func (*Periph) BR 

func (p *Periph) BR(baudrate int) Config

BR calculates the baud rate bits of configuration. BR guarantees that the returned bits corresponds to the value closest to but not greater than baudrate.

func (*Periph) Baudrate 

func (p *Periph) Baudrate() int

Baudrate returns the currently configured baudrate.

func (*Periph) Bus 

func (p *Periph) Bus() bus.Bus

Bus returns a bus to which p is connected to.

func (*Periph) Config added in v0.2.1 

func (p *Periph) Config() Config

Config returns the current p's configuration.

func (*Periph) Disable 

func (p *Periph) Disable()

Disable disables p.

func (*Periph) DisableClock 

func (p *Periph) DisableClock()

DisableClock disables clock for p.

func (*Periph) DisableDMA 

func (p *Periph) DisableDMA(e Event)

DisableDMA disables generating of DMA requests by events e.

func (*Periph) DisableIRQ 

func (p *Periph) DisableIRQ(e Event)

DisableIRQ disables generating of IRQ by events e.

func (*Periph) EditConfig added in v0.2.3 

func (p *Periph) EditConfig(from, to Config)

EditConfig changes configuration.

func (*Periph) Enable 

func (p *Periph) Enable()

Enable enables p.

func (*Periph) EnableClock 

func (p *Periph) EnableClock(lp bool)

EnableClock enables clock for p. lp determines whether the clock remains on in low power (sleep) mode.

func (*Periph) EnableDMA 

func (p *Periph) EnableDMA(e Event)

EnableDMA enables generating of DMA requests by events e.

func (*Periph) EnableIRQ 

func (p *Periph) EnableIRQ(e Event)

EnableIRQ enables generating of IRQ by events e.

func (*Periph) Enabled 

func (p *Periph) Enabled() bool

Enabled reports whether p is enabled.

func (*Periph) LoadByte 

func (p *Periph) LoadByte() byte

LoadByte loads a byte from the data register. Use it only when 8-bit frame is configured.

func (*Periph) LoadWord16 

func (p *Periph) LoadWord16() uint16

LoadWord16 loads a 16-bit word from the data register. Use it only when 16-bit word or data packing is configured.

func (*Periph) Reset 

func (p *Periph) Reset()

Reset resets p.

func (*Periph) SetBaudrate added in v0.2.1 

func (p *Periph) SetBaudrate(baudrate int)

SetBaudrate sets the baudrate (p must be disabled).

func (*Periph) SetConfig added in v0.2.1 

func (p *Periph) SetConfig(conf Config, baudrate int)

SetConfig configures p. If baudrate > 0 it replaces the BR bits in conf with the ones calculated from baudrate. Notice that some configuration changes require disabled p.

func (*Periph) SetWordSize 

func (p *Periph) SetWordSize(size int)

SetWordSize sets size of data word. All families support 8 and 16-bit words, F0, F3, L4 supports 4 to 16-bit. Some families require disabled peripheral before use this function. SetWordSize is mandatory for F0, F3, L4 because the default reset configuration does not work.

func (*Periph) Status 

func (p *Periph) Status() (Event, Error)

Status return current status of p.

func (*Periph) StoreByte 

func (p *Periph) StoreByte(v byte)

StoreByte stores a byte to the data register. Use it only when 8-bit frame is configured.

func (*Periph) StoreWord16 

func (p *Periph) StoreWord16(v uint16)

StoreWord16 stores a 16-bit word to the data register. Use it only when 16-bit word or data packing is configured.

func (*Periph) WordSize 

func (p *Periph) WordSize() int

WordSize return currently used word size.

type Signal added in v0.3.0 

type Signal uint8
const (
	SCK Signal = iota
	MOSI
	MISO
	NSS
)

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