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