nucleo-l552ze

Constants

const (
	LED		= LED_BUILTIN
	LED_BUILTIN	= LED_GREEN
	LED_GREEN	= PC7
	LED_BLUE	= PB7
	LED_RED		= PA9
)
const (
	BUTTON		= BUTTON_USER
	BUTTON_USER	= PC13
)
const (
	// PG7 and PG8 are connected to the ST-Link Virtual Com Port (VCP)
	UART_TX_PIN	= PG7
	UART_RX_PIN	= PG8
	UART_ALT_FN	= 8	// GPIO_AF8_LPUART1
)

UART pins

const NoPin = Pin(0xff)

NoPin explicitly indicates “not a pin”. Use this pin if you want to leave one of the pins in a peripheral unconfigured (if supported by the hardware).

const (
	// Mode Flag
	PinOutput		PinMode	= 0
	PinInput		PinMode	= PinInputFloating
	PinInputFloating	PinMode	= 1
	PinInputPulldown	PinMode	= 2
	PinInputPullup		PinMode	= 3

	// for UART
	PinModeUARTTX	PinMode	= 4
	PinModeUARTRX	PinMode	= 5

	// for I2C
	PinModeI2CSCL	PinMode	= 6
	PinModeI2CSDA	PinMode	= 7

	// for SPI
	PinModeSPICLK	PinMode	= 8
	PinModeSPISDO	PinMode	= 9
	PinModeSPISDI	PinMode	= 10

	// for analog/ADC
	PinInputAnalog	PinMode	= 11
)
const (
	PA0	= portA + 0
	PA1	= portA + 1
	PA2	= portA + 2
	PA3	= portA + 3
	PA4	= portA + 4
	PA5	= portA + 5
	PA6	= portA + 6
	PA7	= portA + 7
	PA8	= portA + 8
	PA9	= portA + 9
	PA10	= portA + 10
	PA11	= portA + 11
	PA12	= portA + 12
	PA13	= portA + 13
	PA14	= portA + 14
	PA15	= portA + 15

	PB0	= portB + 0
	PB1	= portB + 1
	PB2	= portB + 2
	PB3	= portB + 3
	PB4	= portB + 4
	PB5	= portB + 5
	PB6	= portB + 6
	PB7	= portB + 7
	PB8	= portB + 8
	PB9	= portB + 9
	PB10	= portB + 10
	PB11	= portB + 11
	PB12	= portB + 12
	PB13	= portB + 13
	PB14	= portB + 14
	PB15	= portB + 15

	PC0	= portC + 0
	PC1	= portC + 1
	PC2	= portC + 2
	PC3	= portC + 3
	PC4	= portC + 4
	PC5	= portC + 5
	PC6	= portC + 6
	PC7	= portC + 7
	PC8	= portC + 8
	PC9	= portC + 9
	PC10	= portC + 10
	PC11	= portC + 11
	PC12	= portC + 12
	PC13	= portC + 13
	PC14	= portC + 14
	PC15	= portC + 15

	PD0	= portD + 0
	PD1	= portD + 1
	PD2	= portD + 2
	PD3	= portD + 3
	PD4	= portD + 4
	PD5	= portD + 5
	PD6	= portD + 6
	PD7	= portD + 7
	PD8	= portD + 8
	PD9	= portD + 9
	PD10	= portD + 10
	PD11	= portD + 11
	PD12	= portD + 12
	PD13	= portD + 13
	PD14	= portD + 14
	PD15	= portD + 15

	PE0	= portE + 0
	PE1	= portE + 1
	PE2	= portE + 2
	PE3	= portE + 3
	PE4	= portE + 4
	PE5	= portE + 5
	PE6	= portE + 6
	PE7	= portE + 7
	PE8	= portE + 8
	PE9	= portE + 9
	PE10	= portE + 10
	PE11	= portE + 11
	PE12	= portE + 12
	PE13	= portE + 13
	PE14	= portE + 14
	PE15	= portE + 15

	PF0	= portF + 0
	PF1	= portF + 1
	PF2	= portF + 2
	PF3	= portF + 3
	PF4	= portF + 4
	PF5	= portF + 5
	PF6	= portF + 6
	PF7	= portF + 7
	PF8	= portF + 8
	PF9	= portF + 9
	PF10	= portF + 10
	PF11	= portF + 11
	PF12	= portF + 12
	PF13	= portF + 13
	PF14	= portF + 14
	PF15	= portF + 15

	PG0	= portG + 0
	PG1	= portG + 1
	PG2	= portG + 2
	PG3	= portG + 3
	PG4	= portG + 4
	PG5	= portG + 5
	PG6	= portG + 6
	PG7	= portG + 7
	PG8	= portG + 8
	PG9	= portG + 9
	PG10	= portG + 10
	PG11	= portG + 11
	PG12	= portG + 12
	PG13	= portG + 13
	PG14	= portG + 14
	PG15	= portG + 15

	PH0	= portH + 0
	PH1	= portH + 1
)

Variables

var (
	// LPUART1 is the hardware serial port connected to the onboard ST-LINK
	// debugger to be exposed as virtual COM port over USB on Nucleo boards.
	// Both UART0 and UART1 refer to LPUART1.
	UART0	= UART{
		Buffer:			NewRingBuffer(),
		Bus:			stm32.LPUART1,
		AltFuncSelector:	UART_ALT_FN,
	}
	UART1	= &UART0
)
var (
	ErrInvalidInputPin	= errors.New("machine: invalid input pin")
	ErrInvalidOutputPin	= errors.New("machine: invalid output pin")
	ErrInvalidClockPin	= errors.New("machine: invalid clock pin")
	ErrInvalidDataPin	= errors.New("machine: invalid data pin")
	ErrNoPinChangeChannel	= errors.New("machine: no channel available for pin interrupt")
)

func CPUFrequency

func CPUFrequency() uint32

func NewRingBuffer

func NewRingBuffer() *RingBuffer

NewRingBuffer returns a new ring buffer.

type ADC

type ADC struct {
	Pin Pin
}

type ADCConfig

type ADCConfig struct {
	Reference	uint32	// analog reference voltage (AREF) in millivolts
	Resolution	uint32	// number of bits for a single conversion (e.g., 8, 10, 12)
	Samples		uint32	// number of samples for a single conversion (e.g., 4, 8, 16, 32)
}

ADCConfig holds ADC configuration parameters. If left unspecified, the zero value of each parameter will use the peripheral’s default settings.

type PWM

type PWM struct {
	Pin Pin
}

type Pin

type Pin uint8

Pin is a single pin on a chip, which may be connected to other hardware devices. It can either be used directly as GPIO pin or it can be used in other peripherals like ADC, I2C, etc.

func (Pin) Configure

func (p Pin) Configure(config PinConfig)

Configure this pin with the given configuration

func (Pin) ConfigureAltFunc

func (p Pin) ConfigureAltFunc(config PinConfig, altFunc uint8)

Configure this pin with the given configuration including alternate function mapping if necessary.

func (Pin) Get

func (p Pin) Get() bool

Get returns the current value of a GPIO pin.

func (Pin) High

func (p Pin) High()

High sets this GPIO pin to high, assuming it has been configured as an output pin. It is hardware dependent (and often undefined) what happens if you set a pin to high that is not configured as an output pin.

func (Pin) Low

func (p Pin) Low()

Low sets this GPIO pin to low, assuming it has been configured as an output pin. It is hardware dependent (and often undefined) what happens if you set a pin to low that is not configured as an output pin.

func (Pin) Set

func (p Pin) Set(high bool)

Set the pin to high or low. Warning: only use this on an output pin!

func (Pin) SetAltFunc

func (p Pin) SetAltFunc(af uint8)

SetAltFunc maps the given alternative function to the I/O pin

type PinConfig

type PinConfig struct {
	Mode PinMode
}

type PinMode

type PinMode uint8

type RingBuffer

type RingBuffer struct {
	rxbuffer	[bufferSize]volatile.Register8
	head		volatile.Register8
	tail		volatile.Register8
}

RingBuffer is ring buffer implementation inspired by post at https://www.embeddedrelated.com/showthread/comp.arch.embedded/77084-1.php

func (*RingBuffer) Clear

func (rb *RingBuffer) Clear()

Clear resets the head and tail pointer to zero.

func (*RingBuffer) Get

func (rb *RingBuffer) Get() (byte, bool)

Get returns a byte from the buffer. If the buffer is empty, the method will return a false as the second value.

func (*RingBuffer) Put

func (rb *RingBuffer) Put(val byte) bool

Put stores a byte in the buffer. If the buffer is already full, the method will return false.

func (*RingBuffer) Used

func (rb *RingBuffer) Used() uint8

Used returns how many bytes in buffer have been used.

type UART

type UART struct {
	Buffer		*RingBuffer
	Bus		*stm32.USART_Type
	Interrupt	interrupt.Interrupt
	AltFuncSelector	uint8

	// Registers specific to the chip
	rxReg		*volatile.Register32
	txReg		*volatile.Register32
	statusReg	*volatile.Register32
	txEmptyFlag	uint32
}

UART representation

func (UART) Buffered

func (uart UART) Buffered() int

Buffered returns the number of bytes currently stored in the RX buffer.

func (*UART) Configure

func (uart *UART) Configure(config UARTConfig)

Configure the UART.

func (UART) Read

func (uart UART) Read(data []byte) (n int, err error)

Read from the RX buffer.

func (UART) ReadByte

func (uart UART) ReadByte() (byte, error)

ReadByte reads a single byte from the RX buffer. If there is no data in the buffer, returns an error.

func (UART) Receive

func (uart UART) Receive(data byte)

Receive handles adding data to the UART’s data buffer. Usually called by the IRQ handler for a machine.

func (*UART) SetBaudRate

func (uart *UART) SetBaudRate(br uint32)

SetBaudRate sets the communication speed for the UART. Defer to chip-specific routines for calculation

func (UART) Write

func (uart UART) Write(data []byte) (n int, err error)

Write data to the UART.

func (*UART) WriteByte

func (uart *UART) WriteByte(c byte) error

WriteByte writes a byte of data to the UART.

type UARTConfig

type UARTConfig struct {
	BaudRate	uint32
	TX		Pin
	RX		Pin
}