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MicroPython for ESP32 with psRAM support
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MicroPython for ESP32

with support for 4MB of psRAM


This repository can be used to build MicroPython for ESP32 boards/modules with psRAM as well as for ESP32 boards/modules without psRAM.

Building on Linux, MacOS and Windows (including Linux Subsystem on Windows 10) is supported.

MicroPython works great on ESP32, but the most serious issue is still (as on most other MicroPython boards) limited amount of free memory.
This repository contains all the tools and sources necessary to build working MicroPython firmware which can fully use the advantages of 4MB (or more) of psRAM.
It is huge difference between MicroPython running with less than 100KB of free memory and running with 4MB of free memory.


ESP32 can use external SPIRAM (psRAM) to expand available RAM up to 16MB.

Currently, there are several modules & development boards which incorporates 4MB of psRAM:

Wiki pages with detailed documentation specific to this MicroPython port are available.

Some examples can be found in modules_examples directory.

This repository contains all the tools and sources necessary to build working MicroPython firmware which can fully use the advantages of 4MB (or more) of psRAM

It is huge difference between MicroPython running with less than 100KB of free memory and running with 4MB of free memory.

The MicroPython firmware is built as esp-idf component

This means the regular esp-idf menuconfig system can be used for configuration. Besides the ESP32 configuration itself, many MicroPython options can also be configured via menuconfig.

This way many features not available in standard ESP32 MicroPython are enabled, like unicore/dualcore, all Flash speed/mode options etc. No manual sdkconfig.h editing and tweaking is necessary.

Features

How to Build

Detailed instructions on MicroPython building process are available in the Wiki.

Using file systems

Detailed information about using MicroPython file systems are available in the Wiki.

Some examples

Using new machine methods and RTC:

import machine

rtc = machine.RTC()

rtc.init((2017, 6, 12, 14, 35, 20))

rtc.now()

rtc.ntp_sync(server="<ntp_server>" [,update_period=])
  # <ntp_server> can be empty string, then the default server is used ("pool.ntp.org")

rtc.synced()
  # returns True if time synchronized to NTP server

rtc.wake_on_ext0(Pin, level)
rtc.wake_on_ext1(Pin, level)
  # wake up from deepsleep on pin level

machine.deepsleep(10000)
ESP32: DEEP SLEEP

# ...
# ...

Reset reason: Deepsleep wake-up
Wakeup source: RTC wake-up
    uPY stack: 19456 bytes
     uPY heap: 3073664/5664/3068000 bytes (in SPIRAM using malloc)

MicroPython ESP32_LoBo_v3.1.0 - 2017-01-03 on ESP32 board with ESP32
Type "help()" for more information.

machine.wake_reason()
  # returns tuple with reset & wakeup reasons
machine.wake_description()
  # returns tuple with strings describing reset & wakeup reasons

Using sdcard module:

import uos

uos.mountsd()
uos.listdir('/sd')

Working directory can be changed to root of the sd card automatically on mount:

>>> import uos
>>> uos.mountsd(True)
---------------------
 Mode:  SD (4bit)
 Name: NCard
 Type: SDHC/SDXC
Speed: default speed (25 MHz)
 Size: 15079 MB
  CSD: ver=1, sector_size=512, capacity=30881792 read_bl_len=9
  SCR: sd_spec=2, bus_width=5

>>> uos.listdir()
['overlays', 'bcm2708-rpi-0-w.dtb', ......
>>>

Tested on ESP-WROVER-KIT v3 Tested on

Example terminal session

I (0) cpu_start: App cpu up.
I (1569) spiram: SPI SRAM memory test OK
I (1570) heap_init: Initializing. RAM available for dynamic allocation:
D (1570) heap_init: New heap initialised at 0x3ffae6e0
I (1575) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
D (1581) heap_init: New heap initialised at 0x3ffc1a00
I (1586) heap_init: At 3FFC1A00 len 0001E600 (121 KiB): DRAM
I (1593) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (1599) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
D (1606) heap_init: New heap initialised at 0x4009d70c
I (1611) heap_init: At 4009D70C len 000028F4 (10 KiB): IRAM
I (1617) cpu_start: Pro cpu start user code
I (1622) spiram: Adding pool of 4096K of external SPI memory to heap allocator
I (1630) spiram: Reserving pool of 32K of internal memory for DMA/internal allocations
D (1646) clk: RTC_SLOW_CLK calibration value: 3305242
D (89) intr_alloc: Connected src 46 to int 2 (cpu 0)
D (90) intr_alloc: Connected src 57 to int 3 (cpu 0)
D (90) intr_alloc: Connected src 24 to int 9 (cpu 0)
I (95) cpu_start: Starting scheduler on PRO CPU.
D (0) intr_alloc: Connected src 25 to int 2 (cpu 1)
I (4) cpu_start: Starting scheduler on APP CPU.
D (119) heap_init: New heap initialised at 0x3ffe0440
D (125) heap_init: New heap initialised at 0x3ffe4350
D (130) intr_alloc: Connected src 16 to int 12 (cpu 0)
D (145) nvs: nvs_flash_init_custom partition=nvs start=9 count=4
D (178) intr_alloc: Connected src 34 to int 3 (cpu 1)
D (187) intr_alloc: Connected src 22 to int 4 (cpu 1)

Internal FS (SPIFFS): Mounted on partition 'internalfs' [size: 1048576; Flash address: 0x2D0000]
----------------
Filesystem size: 956416 B
           Used: 512 B
           Free: 955904 B
----------------

FreeRTOS running on BOTH CORES, MicroPython task running on both cores.
Running from partition at 10000, type 10 [MicroPython_1].

 Reset reason: Power on reset
    uPY stack: 19456 bytes
     uPY heap: 3073664/5664/3068000 bytes (in SPIRAM using malloc)

MicroPython ESP32_LoBo_v3.1.0 - 2017-01-03 on ESP32 board with ESP32
Type "help()" for more information.
>>> 
>>> import micropython, machine
>>> 
>>> micropython.mem_info()
stack: 752 out of 19456
GC: total: 3073664, used: 5904, free: 3067760
 No. of 1-blocks: 19, 2-blocks: 7, max blk sz: 325, max free sz: 191725
>>> 
>>> machine.heap_info()
Heap outside of MicroPython heap:
---------------------------------
              Free: 239920
         Allocated: 52328
      Minimum free: 233100
      Total blocks: 85
Largest free block: 113804
  Allocated blocks: 79
       Free blocks: 6

SPIRAM info:
------------
              Free: 1048532
         Allocated: 3145728
      Minimum free: 1048532
      Total blocks: 2
Largest free block: 1048532
  Allocated blocks: 1
       Free blocks: 1
>>>