kopia lustrzana https://github.com/micropython/micropython
docs/machine*: Use markup adhering to the latest docs conventions.
Paul Sokolovsky
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7c0e1f1a08
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@ -37,16 +37,16 @@ Constructors
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Construct and return a new I2C object using the following parameters:
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- `id` identifies the particular I2C peripheral. The default
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- *id* identifies a particular I2C peripheral. The default
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value of -1 selects a software implementation of I2C which can
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work (in most cases) with arbitrary pins for SCL and SDA.
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If `id` is -1 then `scl` and `sda` must be specified. Other
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allowed values for `id` depend on the particular port/board,
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and specifying `scl` and `sda` may or may not be required or
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If *id* is -1 then *scl* and *sda* must be specified. Other
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allowed values for *id* depend on the particular port/board,
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and specifying *scl* and *sda* may or may not be required or
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allowed in this case.
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- `scl` should be a pin object specifying the pin to use for SCL.
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- `sda` should be a pin object specifying the pin to use for SDA.
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- `freq` should be an integer which sets the maximum frequency
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- *scl* should be a pin object specifying the pin to use for SCL.
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- *sda* should be a pin object specifying the pin to use for SDA.
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- *freq* should be an integer which sets the maximum frequency
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for SCL.
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General Methods
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@ -56,9 +56,9 @@ General Methods
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Initialise the I2C bus with the given arguments:
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- `scl` is a pin object for the SCL line
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- `sda` is a pin object for the SDA line
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- `freq` is the SCL clock rate
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- *scl* is a pin object for the SCL line
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- *sda* is a pin object for the SDA line
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- *freq* is the SCL clock rate
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.. method:: I2C.deinit()
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@ -93,9 +93,9 @@ control over the bus, otherwise the standard methods (see below) can be used.
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.. method:: I2C.readinto(buf, nack=True)
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Reads bytes from the bus and stores them into `buf`. The number of bytes
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read is the length of `buf`. An ACK will be sent on the bus after
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receiving all but the last byte. After the last byte is received, if `nack`
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Reads bytes from the bus and stores them into *buf*. The number of bytes
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read is the length of *buf*. An ACK will be sent on the bus after
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receiving all but the last byte. After the last byte is received, if *nack*
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is true then a NACK will be sent, otherwise an ACK will be sent (and in this
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case the slave assumes more bytes are going to be read in a later call).
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@ -103,7 +103,7 @@ control over the bus, otherwise the standard methods (see below) can be used.
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.. method:: I2C.write(buf)
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Write the bytes from `buf` to the bus. Checks that an ACK is received
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Write the bytes from *buf* to the bus. Checks that an ACK is received
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after each byte and stops transmitting the remaining bytes if a NACK is
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received. The function returns the number of ACKs that were received.
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@ -117,23 +117,23 @@ operations that target a given slave device.
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.. method:: I2C.readfrom(addr, nbytes, stop=True)
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Read `nbytes` from the slave specified by `addr`.
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If `stop` is true then a STOP condition is generated at the end of the transfer.
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Read *nbytes* from the slave specified by *addr*.
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If *stop* is true then a STOP condition is generated at the end of the transfer.
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Returns a `bytes` object with the data read.
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.. method:: I2C.readfrom_into(addr, buf, stop=True)
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Read into `buf` from the slave specified by `addr`.
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The number of bytes read will be the length of `buf`.
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If `stop` is true then a STOP condition is generated at the end of the transfer.
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Read into *buf* from the slave specified by *addr*.
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The number of bytes read will be the length of *buf*.
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If *stop* is true then a STOP condition is generated at the end of the transfer.
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The method returns `None`.
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The method returns ``None``.
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.. method:: I2C.writeto(addr, buf, stop=True)
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Write the bytes from `buf` to the slave specified by `addr`. If a
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NACK is received following the write of a byte from `buf` then the
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remaining bytes are not sent. If `stop` is true then a STOP condition is
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Write the bytes from *buf* to the slave specified by *addr*. If a
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NACK is received following the write of a byte from *buf* then the
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remaining bytes are not sent. If *stop* is true then a STOP condition is
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generated at the end of the transfer, even if a NACK is received.
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The function returns the number of ACKs that were received.
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@ -147,26 +147,26 @@ methods are convenience functions to communicate with such devices.
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.. method:: I2C.readfrom_mem(addr, memaddr, nbytes, \*, addrsize=8)
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Read `nbytes` from the slave specified by `addr` starting from the memory
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address specified by `memaddr`.
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The argument `addrsize` specifies the address size in bits.
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Read *nbytes* from the slave specified by *addr* starting from the memory
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address specified by *memaddr*.
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The argument *addrsize* specifies the address size in bits.
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Returns a `bytes` object with the data read.
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.. method:: I2C.readfrom_mem_into(addr, memaddr, buf, \*, addrsize=8)
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Read into `buf` from the slave specified by `addr` starting from the
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memory address specified by `memaddr`. The number of bytes read is the
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length of `buf`.
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The argument `addrsize` specifies the address size in bits (on ESP8266
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Read into *buf* from the slave specified by *addr* starting from the
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memory address specified by *memaddr*. The number of bytes read is the
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length of *buf*.
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The argument *addrsize* specifies the address size in bits (on ESP8266
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this argument is not recognised and the address size is always 8 bits).
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The method returns `None`.
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The method returns ``None``.
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.. method:: I2C.writeto_mem(addr, memaddr, buf, \*, addrsize=8)
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Write `buf` to the slave specified by `addr` starting from the
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memory address specified by `memaddr`.
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The argument `addrsize` specifies the address size in bits (on ESP8266
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Write *buf* to the slave specified by *addr* starting from the
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memory address specified by *memaddr*.
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The argument *addrsize* specifies the address size in bits (on ESP8266
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this argument is not recognised and the address size is always 8 bits).
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The method returns `None`.
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The method returns ``None``.
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@ -18,7 +18,7 @@ UART objects can be created and initialised using::
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Supported parameters differ on a board:
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Pyboard: Bits can be 7, 8 or 9. Stop can be 1 or 2. With `parity=None`,
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Pyboard: Bits can be 7, 8 or 9. Stop can be 1 or 2. With *parity=None*,
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only 8 and 9 bits are supported. With parity enabled, only 7 and 8 bits
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are supported.
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@ -13,7 +13,7 @@ damage.
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.. _machine_callbacks:
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A note of callbacks used by functions and class methods of ``machine`` module:
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A note of callbacks used by functions and class methods of :mod:`machine` module:
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all these callbacks should be considered as executing in an interrupt context.
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This is true for both physical devices with IDs >= 0 and "virtual" devices
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with negative IDs like -1 (these "virtual" devices are still thin shims on
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@ -38,14 +38,14 @@ Interrupt related functions
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Disable interrupt requests.
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Returns the previous IRQ state which should be considered an opaque value.
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This return value should be passed to the ``enable_irq`` function to restore
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interrupts to their original state, before ``disable_irq`` was called.
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This return value should be passed to the `enable_irq()` function to restore
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interrupts to their original state, before `disable_irq()` was called.
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.. function:: enable_irq(state)
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Re-enable interrupt requests.
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The ``state`` parameter should be the value that was returned from the most
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recent call to the ``disable_irq`` function.
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The *state* parameter should be the value that was returned from the most
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recent call to the `disable_irq()` function.
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Power related functions
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-----------------------
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@ -71,8 +71,8 @@ Power related functions
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Stops the CPU and all peripherals (including networking interfaces, if any). Execution
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is resumed from the main script, just as with a reset. The reset cause can be checked
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to know that we are coming from ``machine.DEEPSLEEP``. For wake up to actually happen,
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wake sources should be configured first, like ``Pin`` change or ``RTC`` timeout.
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to know that we are coming from `machine.DEEPSLEEP`. For wake up to actually happen,
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wake sources should be configured first, like `Pin` change or `RTC` timeout.
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.. only:: port_wipy
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@ -98,18 +98,18 @@ Miscellaneous functions
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.. function:: time_pulse_us(pin, pulse_level, timeout_us=1000000)
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Time a pulse on the given `pin`, and return the duration of the pulse in
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microseconds. The `pulse_level` argument should be 0 to time a low pulse
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Time a pulse on the given *pin*, and return the duration of the pulse in
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microseconds. The *pulse_level* argument should be 0 to time a low pulse
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or 1 to time a high pulse.
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If the current input value of the pin is different to `pulse_level`,
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the function first (*) waits until the pin input becomes equal to `pulse_level`,
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then (**) times the duration that the pin is equal to `pulse_level`.
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If the pin is already equal to `pulse_level` then timing starts straight away.
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If the current input value of the pin is different to *pulse_level*,
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the function first (*) waits until the pin input becomes equal to *pulse_level*,
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then (**) times the duration that the pin is equal to *pulse_level*.
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If the pin is already equal to *pulse_level* then timing starts straight away.
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The function will return -2 if there was timeout waiting for condition marked
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(*) above, and -1 if there was timeout during the main measurement, marked (**)
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above. The timeout is the same for both cases and given by `timeout_us` (which
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above. The timeout is the same for both cases and given by *timeout_us* (which
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is in microseconds).
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.. _machine_constants:
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