mirror of https://github.com/ArduPilot/ardupilot
89 lines
3.3 KiB
C++
89 lines
3.3 KiB
C++
#pragma once
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#include <stdint.h>
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#include "AP_HAL_Namespace.h"
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#include "utility/BetterStream.h"
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/* Pure virtual UARTDriver class */
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class AP_HAL::UARTDriver : public AP_HAL::BetterStream {
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public:
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UARTDriver() {}
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virtual void begin(uint32_t baud) = 0;
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/// Extended port open method
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///
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/// Allows for both opening with specified buffer sizes, and re-opening
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/// to adjust a subset of the port's settings.
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///
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/// @note Buffer sizes greater than ::_max_buffer_size will be rounded
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/// down.
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///
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/// @param baud Selects the speed that the port will be
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/// configured to. If zero, the port speed is left
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/// unchanged.
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/// @param rxSpace Sets the receive buffer size for the port. If zero
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/// then the buffer size is left unchanged if the port
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/// is open, or set to ::_default_rx_buffer_size if it is
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/// currently closed.
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/// @param txSpace Sets the transmit buffer size for the port. If zero
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/// then the buffer size is left unchanged if the port
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/// is open, or set to ::_default_tx_buffer_size if it
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/// is currently closed.
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///
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virtual void begin(uint32_t baud, uint16_t rxSpace, uint16_t txSpace) = 0;
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virtual void end() = 0;
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virtual void flush() = 0;
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virtual bool is_initialized() = 0;
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virtual void set_blocking_writes(bool blocking) = 0;
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virtual bool tx_pending() = 0;
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// lock a port for exclusive use. Use a key of 0 to unlock
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virtual bool lock_port(uint32_t key) { return false; }
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// write to a locked port. If port is locked and key is not correct then 0 is returned
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// and write is discarded
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virtual size_t write_locked(const uint8_t *buffer, size_t size, uint32_t key) { return 0; }
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enum flow_control {
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FLOW_CONTROL_DISABLE=0, FLOW_CONTROL_ENABLE=1, FLOW_CONTROL_AUTO=2
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};
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virtual void set_flow_control(enum flow_control flow_control_setting) {};
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virtual enum flow_control get_flow_control(void) { return FLOW_CONTROL_DISABLE; }
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virtual void configure_parity(uint8_t v){};
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virtual void set_stop_bits(int n){};
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/* unbuffered writes bypass the ringbuffer and go straight to the
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* file descriptor
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*/
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virtual bool set_unbuffered_writes(bool on){ return false; };
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/*
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wait for at least n bytes of incoming data, with timeout in
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milliseconds. Return true if n bytes are available, false if
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timeout
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*/
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virtual bool wait_timeout(uint16_t n, uint32_t timeout_ms) { return false; }
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/*
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* Optional method to control the update of the motors. Derived classes
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* can implement it if their HAL layer requires.
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*/
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virtual void _timer_tick(void) { }
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/*
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return timestamp estimate in microseconds for when the start of
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a nbytes packet arrived on the uart. This should be treated as a
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time constraint, not an exact time. It is guaranteed that the
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packet did not start being received after this time, but it
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could have been in a system buffer before the returned time.
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This takes account of the baudrate of the link. For transports
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that have no baudrate (such as USB) the time estimate may be
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less accurate.
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A return value of zero means the HAL does not support this API
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*/
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virtual uint64_t receive_time_constraint_us(uint16_t nbytes) { return 0; }
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};
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