102 lines
3.8 KiB
ReStructuredText
102 lines
3.8 KiB
ReStructuredText
:mod:`esp` --- functions related to the ESP8266 and ESP32
|
|
=========================================================
|
|
|
|
.. module:: esp
|
|
:synopsis: functions related to the ESP8266 and ESP32
|
|
|
|
The ``esp`` module contains specific functions related to both the ESP8266 and
|
|
ESP32 modules. Some functions are only available on one or the other of these
|
|
ports.
|
|
|
|
|
|
Functions
|
|
---------
|
|
|
|
.. function:: sleep_type([sleep_type])
|
|
|
|
**Note**: ESP8266 only
|
|
|
|
Get or set the sleep type.
|
|
|
|
If the *sleep_type* parameter is provided, sets the sleep type to its
|
|
value. If the function is called without parameters, returns the current
|
|
sleep type.
|
|
|
|
The possible sleep types are defined as constants:
|
|
|
|
* ``SLEEP_NONE`` -- all functions enabled,
|
|
* ``SLEEP_MODEM`` -- modem sleep, shuts down the WiFi Modem circuit.
|
|
* ``SLEEP_LIGHT`` -- light sleep, shuts down the WiFi Modem circuit
|
|
and suspends the processor periodically.
|
|
|
|
The system enters the set sleep mode automatically when possible.
|
|
|
|
.. function:: deepsleep(time_us=0, /)
|
|
|
|
**Note**: ESP8266 only - use `machine.deepsleep()` on ESP32
|
|
|
|
Enter deep sleep.
|
|
|
|
The whole module powers down, except for the RTC clock circuit, which can
|
|
be used to restart the module after the specified time if the pin 16 is
|
|
connected to the reset pin. Otherwise the module will sleep until manually
|
|
reset.
|
|
|
|
.. function:: flash_id()
|
|
|
|
**Note**: ESP8266 only
|
|
|
|
Read the device ID of the flash memory.
|
|
|
|
.. function:: flash_size()
|
|
|
|
Read the total size of the flash memory.
|
|
|
|
.. function:: flash_user_start()
|
|
|
|
Read the memory offset at which the user flash space begins.
|
|
|
|
.. function:: flash_read(byte_offset, length_or_buffer)
|
|
|
|
.. function:: flash_write(byte_offset, bytes)
|
|
|
|
.. function:: flash_erase(sector_no)
|
|
|
|
.. function:: set_native_code_location(start, length)
|
|
|
|
**Note**: ESP8266 only
|
|
|
|
Set the location that native code will be placed for execution after it is
|
|
compiled. Native code is emitted when the ``@micropython.native``,
|
|
``@micropython.viper`` and ``@micropython.asm_xtensa`` decorators are applied
|
|
to a function. The ESP8266 must execute code from either iRAM or the lower
|
|
1MByte of flash (which is memory mapped), and this function controls the
|
|
location.
|
|
|
|
If *start* and *length* are both ``None`` then the native code location is
|
|
set to the unused portion of memory at the end of the iRAM1 region. The
|
|
size of this unused portion depends on the firmware and is typically quite
|
|
small (around 500 bytes), and is enough to store a few very small
|
|
functions. The advantage of using this iRAM1 region is that it does not
|
|
get worn out by writing to it.
|
|
|
|
If neither *start* nor *length* are ``None`` then they should be integers.
|
|
*start* should specify the byte offset from the beginning of the flash at
|
|
which native code should be stored. *length* specifies how many bytes of
|
|
flash from *start* can be used to store native code. *start* and *length*
|
|
should be multiples of the sector size (being 4096 bytes). The flash will
|
|
be automatically erased before writing to it so be sure to use a region of
|
|
flash that is not otherwise used, for example by the firmware or the
|
|
filesystem.
|
|
|
|
When using the flash to store native code *start+length* must be less
|
|
than or equal to 1MByte. Note that the flash can be worn out if repeated
|
|
erasures (and writes) are made so use this feature sparingly.
|
|
In particular, native code needs to be recompiled and rewritten to flash
|
|
on each boot (including wake from deepsleep).
|
|
|
|
In both cases above, using iRAM1 or flash, if there is no more room left
|
|
in the specified region then the use of a native decorator on a function
|
|
will lead to `MemoryError` exception being raised during compilation of
|
|
that function.
|