ESP32
original image: aliexpress.com
original image: zeptobars.com
original image: zeptobars.com
original image: zeptobars.com
Originally the ESP8266 came to prominence as a WiFi controller for AVR and similar, but ...
| Arduino | ESP8266 | RPi 2 |
|---|---|---|
| AVR ATMega328P | Tensilica Xtensa LX106 | ARM Cortex A53 |
| 8 bit | 32 bit | 32 bit |
| 1 core | 1 core | 4 core |
| 20 MHz | 80-160 MHz | 900 MHz |
| 2 KB RAM | 160 KB RAM | 1 GB RAM |
| 32 KB Flash | 4 MB Flash | MicroSDHC |
| Arduino | ESP8266 | ESP32 | RPi 2 |
|---|---|---|---|
| AVR ATMega328P | Tensilica Xtensa LX106 | Tensilica Xtensa LX6 | ARM Cortex A53 |
| 8 bit | 32 bit | 32 bit | 32 bit |
| 1 core | 1 core | 2 core | 4 core |
| 20 MHz | 80-160 MHz | 240 MHz | 900 MHz |
| 2 KB RAM | 160 KB RAM | 520 KB RAM | 1 GB RAM |
| 32 KB Flash | 4 MB Flash | 16 MB Flash | MicroSDHC |
Sparkfun ESP32 Thing / ESP32-DevKitC / AdaFruit HUZZAH32
original images: sparkfun.com and espressif.com and adafruit.com
$ git clone https://github.com/espressif/esptool.git $ cd esptool $ python setup.py install
pypi and ubuntu repositories are not up to date here ...
IoT Development Framework
C SDK for building programs to run on ESP32
Contains LWIP, examples, instructions for building toolchain
$ git clone --recursive https://github.com/espressif/esp-idf.git
For more background, see
Damien's talk about the Kickstarter campaign
from PyConAU 2016
Development of esp32 port was sponsored in part by
Microbric Pty Ltd
Use esptool to load onto board:
$ export ESPTOOL_PORT=/dev/ttyUSB0
$ export ESPTOOL_BAUD=115200
$ export ESPTOOL_FS=detect
$ esptool write_flash 0 \
esp32-20170604-v1.8.7-964-g62d40e8b.bin
$ miniterm.py /dev/ttyUSB0 115200 --raw
MicroPython v1.8.7-964-g62d40e8b on 2017-06-04; ESP module with ESP32
Type "help()" for more information.
>>> dir()
['uos', 'gc', '__name__', 'bdev']
>>> print("Hello, World!")
Hello, World!
>>> 2**100
1267650600228229401496703205376
>>> import os
>>> os.listdir(".")
['boot.py']
>>>
>>> import machine >>> import time >>> pin5 = machine.Pin(5, machine.Pin.OUT) >>> while True: ... pin5.value(0) ... time.sleep(0.5) ... pin5.value(1) ... time.sleep(0.5)
import machine
class Servo:
def __init__(self, pin):
self.pwm = machine.PWM(pin)
self.pwm.freq(50)
def set(self, pos):
pulse_us = 1000 + 1000 * min(1,max(pos,0))
self.pwm.duty(int(pulse_us * self.pwm.freq() * 0.001024))
pin5 = machine.Pin(5, machine.Pin.OUT)
srv5 = Servo(pin5)
srv5.set(0.25)
srv5.set(0.9)
>>> import network
>>> sta_if = network.WLAN(network.STA_IF)
>>> sta_if.active(True)
>>> sta_if.scan()
>>> sta_if.isconnected()
False
>>> sta_if.connect("my_ap", "my_password")
>>> sta_if.isconnected()
True
>>> sta_if.ifconfig()
('10.107.1.124', '255.255.255.0', '10.107.1.1', '10.107.1.1')
>>> import socket
>>> sock = socket.socket(socket.AF_INET)
>>> sock.bind(('0.0.0.0', 80))
>>> sock.listen(5)
>>> sock.accept()
(<socket state=2 timeout=-1 incoming=0 off=0>, ('10.107.1.4', 37464))
github: micropython/micropython-esp32
$ git clone https://github.com/micropython/micropython-esp32
$ git clone --recursive https://github.com/espressif/esp-idf
$ wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-59.tar.gz
$ tar xzf xtensa-esp32-elf-linux64-1.22.0-59.tar.gz
$ export ESPIDF=`realpath esp-idf`
$ export PATH=`realpath xtensa-esp32-elf/bin`:$PATH
$ cd micropython-esp32
$ make -C mpy-cross
$ make -C esp32
ACKNOWLEDGEMENTS esp32/ minimal/ teensy/ bare-arm/ esp8266/ mpy-cross/ tests/ cc3200/ examples/ pic16bit/ tools/ CODECONVENTIONS.md extmod/ py/ unix/ CONTRIBUTING.md lib/ qemu-arm/ windows/ docs/ LICENSE README.md zephyr/ drivers/ logo/ stmhal/
ACKNOWLEDGEMENTS esp32/ minimal/ teensy/ bare-arm/ esp8266/ mpy-cross/ tests/ cc3200/ examples/ pic16bit/ tools/ CODECONVENTIONS.md extmod/ py/ unix/ CONTRIBUTING.md lib/ qemu-arm/ windows/ docs/ LICENSE README.md zephyr/ drivers/ logo/ stmhal/
Documentation, Examples, Tests
ACKNOWLEDGEMENTS esp32/ minimal/ teensy/ bare-arm/ esp8266/ mpy-cross/ tests/ cc3200/ examples/ pic16bit/ tools/ CODECONVENTIONS.md extmod/ py/ unix/ CONTRIBUTING.md lib/ qemu-arm/ windows/ docs/ LICENSE README.md zephyr/ drivers/ logo/ stmhal/
Shared between ports
ACKNOWLEDGEMENTS esp32/ minimal/ teensy/ bare-arm/ esp8266/ mpy-cross/ tests/ cc3200/ examples/ pic16bit/ tools/ CODECONVENTIONS.md extmod/ py/ unix/ CONTRIBUTING.md lib/ qemu-arm/ windows/ docs/ LICENSE README.md zephyr/ drivers/ logo/ stmhal/
Ports to specific platforms
ACKNOWLEDGEMENTS esp32/ minimal/ teensy/ bare-arm/ esp8266/ mpy-cross/ tests/ cc3200/ examples/ pic16bit/ tools/ CODECONVENTIONS.md extmod/ py/ unix/ CONTRIBUTING.md lib/ qemu-arm/ windows/ docs/ LICENSE README.md zephyr/ drivers/ logo/ stmhal/
The ESP32 port!
esp32.custom_common.ld modesp.c mphalport.c fatfs_port.c modmachine.c mphalport.h gccollect.c modmachine.h qstrdefsport.h gccollect.h modnetwork.c README.md help.c modsocket.c sdkconfig.h machine_pin.c modules/ uart.c main.c moduos.c uart.h Makefile modutime.c memory.h mpconfigport.h
README and Makefile
esp32.custom_common.ld modesp.c mphalport.c fatfs_port.c modmachine.c mphalport.h gccollect.c modmachine.h qstrdefsport.h gccollect.h modnetwork.c README.md help.c modsocket.c sdkconfig.h machine_pin.c modules/ uart.c main.c moduos.c uart.h Makefile modutime.c memory.h mpconfigport.h
Modules implemented in C
>>> import esp >>> dir(esp) ['__name__', 'flash_read', 'flash_write', 'flash_erase', 'flash_size', 'flash_user_start'] >>> esp.flash_size() 4194304
esp-idf/components/spi_flash/include/esp_spi_flash.h
/** * @brief Get flash chip size, as set in binary image header * * @note This value does not necessarily match real flash size. * * @return size of flash chip, in bytes */ size_t spi_flash_get_chip_size();
esp32/modesp.c
#include "esp_spi_flash.h"
STATIC mp_obj_t esp_flash_size(void) {
return mp_obj_new_int_from_uint(spi_flash_get_chip_size());
}
esp32/modesp.c
#include "esp_spi_flash.h"
STATIC mp_obj_t esp_flash_size(void) {
return mp_obj_new_int_from_uint(spi_flash_get_chip_size());
}
esp32/modesp.c
#include "esp_spi_flash.h"
STATIC mp_obj_t esp_flash_size(void) {
return mp_obj_new_int_from_uint(spi_flash_get_chip_size());
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp_flash_size_obj, esp_flash_size);
esp32/modesp.c
#include "esp_spi_flash.h"
STATIC mp_obj_t esp_flash_size(void) {
return mp_obj_new_int_from_uint(spi_flash_get_chip_size());
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp_flash_size_obj, esp_flash_size);
STATIC const mp_rom_map_elem_t esp_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_esp) },
{ MP_ROM_QSTR(MP_QSTR_flash_size), MP_ROM_PTR(&esp_flash_size_obj) },
};
esp32/modesp.c
#include "esp_spi_flash.h"
STATIC mp_obj_t esp_flash_size(void) {
return mp_obj_new_int_from_uint(spi_flash_get_chip_size());
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp_flash_size_obj, esp_flash_size);
STATIC const mp_rom_map_elem_t esp_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_esp) },
{ MP_ROM_QSTR(MP_QSTR_flash_size), MP_ROM_PTR(&esp_flash_size_obj) },
};
STATIC MP_DEFINE_CONST_DICT(esp_module_globals, esp_module_globals_table);
const mp_obj_module_t esp_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&esp_module_globals,
};
esp32/mpconfigport.h
extern const struct _mp_obj_module_t esp_module;
#define MICROPY_PORT_BUILTIN_MODULES \
{ MP_OBJ_NEW_QSTR(MP_QSTR_esp), (mp_obj_t)&esp_module }, \
esp32/Makefile
SRC_C = \
modesp.c \
>>> import esp >>> dir(esp) ['__name__', 'flash_read', 'flash_write', 'flash_erase', 'flash_size', 'flash_user_start'] >>> esp.flash_size() 4194304
If you're interested in Microcontrollers / IoT / Robotics:
Nick Moore
Mnemote Pty Ltd
Slides:
Content and images © Mnemote Pty Ltd except where otherwise noted
Nick Moore <nick@mnemote.com> for Melbourne Python Users Group
