esp32 module contains functions and classes specifically aimed at
controlling ESP32 modules.
Configure whether or not a touch will wake the device from sleep. wake should be a boolean value.
Configure how EXT0 wakes the device from sleep. pin can be
Noneor a valid Pin object. level should be
Configure how EXT1 wakes the device from sleep. pins can be
Noneor a tuple/list of valid Pin objects. level should be
Read the raw value of the internal temperature sensor, returning an integer.
Read the raw value of the internal Hall sensor, returning an integer.
Returns information about the ESP-IDF heap memory regions. One of them contains the MicroPython heap and the others are used by ESP-IDF, e.g., for network buffers and other data. This data is useful to get a sense of how much memory is available to ESP-IDF and the networking stack in particular. It may shed some light on situations where ESP-IDF operations fail due to allocation failures. The information returned is not useful to troubleshoot Python allocation failures, use
The capabilities parameter corresponds to ESP-IDF’s
MALLOC_CAP_XXXvalues but the two most useful ones are predefined as
esp32.HEAP_DATAfor data heap regions and
esp32.HEAP_EXECfor executable regions as used by the native code emitter.
The return value is a list of 4-tuples, where each 4-tuple corresponds to one heap and contains: the total bytes, the free bytes, the largest free block, and the minimum free seen over time.
Example after booting:
>>> import esp32; esp32.idf_heap_info(esp32.HEAP_DATA) [(240, 0, 0, 0), (7288, 0, 0, 0), (16648, 4, 4, 4), (79912, 35712, 35512, 35108), (15072, 15036, 15036, 15036), (113840, 0, 0, 0)]
This class gives access to the partitions in the device’s flash memory and includes methods to enable over-the-air (OTA) updates.
Create an object representing a partition. id can be a string which is the label of the partition to retrieve, or one of the constants:
find(type=TYPE_APP, subtype=255, label=None)¶
Find a partition specified by type, subtype and label. Returns a (possibly empty) list of Partition objects. Note:
subtype=0xffmatches any subtype and
label=Nonematches any label.
Returns a 6-tuple
(type, subtype, addr, size, label, encrypted).
readblocks(block_num, buf, offset)
writeblocks(block_num, buf, offset)
Sets the partition as the boot partition.
Gets the next update partition after this one, and returns a new Partition object. Typical usage is
Partition(Partition.RUNNING).get_next_update()which returns the next partition to update given the current running one.
Signals that the current boot is considered successful. Calling
mark_app_valid_cancel_rollbackis required on the first boot of a new partition to avoid an automatic rollback at the next boot. This uses the ESP-IDF “app rollback” feature with “CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE” and an
OSError(-261)is raised if called on firmware that doesn’t have the feature enabled. It is OK to call
mark_app_valid_cancel_rollbackon every boot and it is not necessary when booting firmare that was loaded using esptool.
Used in the
Partitionconstructor to fetch various partitions:
BOOTis the partition that will be booted at the next reset and
RUNNINGis the currently running partition.
Partition.findto specify the partition type:
APPis for bootable firmware partitions (typically labelled
DATAis for other partitions, e.g.
The RMT (Remote Control) module, specific to the ESP32, was originally designed to send and receive infrared remote control signals. However, due to a flexible design and very accurate (as low as 12.5ns) pulse generation, it can also be used to transmit or receive many other types of digital signals:
import esp32 from machine import Pin r = esp32.RMT(0, pin=Pin(18), clock_div=8) r # RMT(channel=0, pin=18, source_freq=80000000, clock_div=8) # To use carrier frequency r = esp32.RMT(0, pin=Pin(18), clock_div=8, carrier_freq=38000) r # RMT(channel=0, pin=18, source_freq=80000000, clock_div=8, carrier_freq=38000, carrier_duty_percent=50) # The channel resolution is 100ns (1/(source_freq/clock_div)). r.write_pulses((1, 20, 2, 40), start=0) # Send 0 for 100ns, 1 for 2000ns, 0 for 200ns, 1 for 4000ns
The input to the RMT module is an 80MHz clock (in the future it may be able to
configure the input clock but, for now, it’s fixed).
the clock input which determines the resolution of the RMT channel. The
numbers specificed in
write_pulses are multiplied by the resolution to
define the pulses.
clock_div is an 8-bit divider (0-255) and each pulse can be defined by
multiplying the resolution by a 15-bit (0-32,768) number. There are eight
channels (0-7) and each can have a different clock divider.
To enable the carrier frequency feature of the esp32 hardware, specify the
carrier_freq as something like 38000, a typical IR carrier frequency.
So, in the example above, the 80MHz clock is divided by 8. Thus the
resolution is (1/(80Mhz/8)) 100ns. Since the
start level is 0 and toggles
with each number, the bitstream is
0101 with durations of [100ns, 2000ns,
For more details see Espressif’s ESP-IDF RMT documentation..
The current MicroPython RMT implementation lacks some features, most notably receiving pulses. RMT should be considered a beta feature and the interface may change in the future.
RMT(channel, *, pin=None, clock_div=8, carrier_freq=0, carrier_duty_percent=50)¶
This class provides access to one of the eight RMT channels. channel is required and identifies which RMT channel (0-7) will be configured. pin, also required, configures which Pin is bound to the RMT channel. clock_div is an 8-bit clock divider that divides the source clock (80MHz) to the RMT channel allowing the resolution to be specified. carrier_freq is used to enable the carrier feature and specify its frequency, default value is
0(not enabled). To enable, specify a positive integer. carrier_duty_percent defaults to 50.
Returns the source clock frequency. Currently the source clock is not configurable so this will always return 80MHz.
Return the clock divider. Note that the channel resolution is
1 / (source_freq / clock_div).
Trueif the channel is currently transmitting a stream of pulses started with a call to
If timeout (defined in ticks of
source_freq / clock_div) is specified the method will wait for timeout or until transmission is complete, returning
Falseif the channel continues to transmit. If looping is enabled with
RMT.loopand a stream has started, then this method will always (wait and) return
Configure looping on the channel. enable_loop is bool, set to
Trueto enable looping on the next call to
RMT.write_pulses. If called with
Falsewhile a looping stream is currently being transmitted then the current set of pulses will be completed before transmission stops.
Begin sending pulses, a list or tuple defining the stream of pulses. The length of each pulse is defined by a number to be multiplied by the channel resolution
(1 / (source_freq / clock_div)). start defines whether the stream starts at 0 or 1.
If transmission of a stream is currently in progress then this method will block until transmission of that stream has ended before beginning sending pulses.
If looping is enabled with
RMT.loop, the stream of pulses will be repeated indefinitely. Further calls to
RMT.write_pulseswill end the previous stream - blocking until the last set of pulses has been transmitted - before starting the next stream.
This class provides access to the Ultra-Low-Power co-processor.
Set the wake-up period.
Load a program_binary into the ULP at the given load_addr.
Start the ULP running at the given entry_point.