Class ArchAVR_USART

Nested Relationships

Nested Types

Inheritance Relationships

Base Type

Class Documentation

class ArchAVR_USART : public Peripheral

Implementation of a USART interface for AVR series.

Supported features:

  • 8-bits frames only, regardless of the frame size setting

  • stop bits and parity settings have no effect

  • synchronous, SPI and MPCM modes are not supported

  • RXC, TXC, UDRE interrupts are supported

  • Error flags are not supported

CTLREQs supported:

  • AVR_CTLREQ_GET_SIGNAL : returns in data.p the signal of the underlying UART (see sim_uart.h)

  • AVR_CTLREQ_UART_ENDPOINT : returns in data.p the endpoint to use in order to transmit data in and out (see sim_uart.h)

Public Functions

ArchAVR_USART(uint8_t num, const ArchAVR_USARTConfig &config)
virtual ~ArchAVR_USART()
virtual bool init(Device &device) override

Virtual method called when the device is initialised. This is where the peripheral can allocate its I/O registers, interrupts or connect signals.

Returns:

boolean indicates the success of all allocations.

virtual void reset() override

Virtual method called when the device is reset. Note that resetting I/O registers is only necessary here if their reset value is not zero.

virtual bool ctlreq(ctlreq_id_t req, ctlreq_data_t *data) override

Virtual method called for a CTL request. The method must return true if the request has been processed.

virtual uint8_t ioreg_read_handler(reg_addr_t addr, uint8_t value) override

Virtual method called when the CPU is reading a I/O register allocated by this peripheral. The value has not been read yet so the module can modify it before the CPU gets it.

Parameters:

  • addr – the register address in I/O space

  • value – current cached value of the register

Returns:

actual value of the register

virtual void ioreg_write_handler(reg_addr_t addr, const ioreg_write_t &data) override

Virtual method called when the CPU is writing a I/O register allocated by this peripheral. The value has already been written.

Parameters:

  • addr – the register address in I/O space

  • value – the new register content

class _Controller : public UART::USART

Public Functions

inline _Controller(ArchAVR_USART &per)

Protected Functions

inline virtual void set_line_state(Line line, bool state) override
inline virtual bool get_line_state(Line line) const override
class _PinDriver : public PinDriver

Public Functions

_PinDriver(ArchAVR_USART &per)
void reset()
void set_line_enabled(Line line, bool enabled)
void set_line_state(Line line, bool state)
bool get_line_state(Line line) const
virtual Pin::controls_t override_gpio(pin_index_t pin_index, const Pin::controls_t &gpio_controls) override

Stub called when a state resolution is taking place on a pin that the driver is controlling. The reimplementation should make a copy of the controls structure in argument, change its members according to the override state and return the result.

Parameters:

  • pin_index – index of the pin

  • controls – pin controls as configured by the GPIO port controller

Returns:

the controls to apply to the pin

virtual void digital_state_changed(pin_index_t pin_index, bool dig_state) override

Stub called when the digital state of a pin has changed after a state resolution.

Parameters:

  • pin_index – Index of the pin

  • state – New digital state of the pin