ESP32

Feature ESP32 (original, e.g. ESP32-D0WD) ESP32-C3
Release year 2016 2020
CPU architecture Xtensa LX6 RISC-V RV32IMC (open-source ISA)
Cores Dual-core (single-core variants exist) Single-core
Max clock 240 MHz 160 MHz
Floating-Point Unit Yes (in Xtensa LX6) No hardware FPU
Bluetooth Classic BT 4.2 BR/EDR + BLE BLE 5.0 only (no Classic, no audio)
SRAM 520 KB 400 KB (16 KB used for cache)
ROM 448 KB 384 KB
RTC SRAM 16 KB 8 KB
External PSRAM support Yes (up to 8 MB) No
Integrated flash 0 / 2 / 4 MB (variant dependent) 0 / 4 MB (some modules 8 MB)
Package QFN48 (5×5 / 6×6 mm) QFN32 (5×5 mm)
GPIO (max) 34 22 (some modules expose 15–16)
ADC 2× 12-bit, up to 18 channels 2× 12-bit SAR, up to 6 channels
DAC 2× 8-bit None
Touch sensor 10 channels None
Hall sensor Yes None
UART 3 2
SPI 4 3
I2C 2 1
I2S 2 1
LED PWM 16 channels 6 channels
MCPWM 2 (6 outputs) None
RMT 8 channels 2 TX + 2 RX channels
USB None (needs external USB-UART) Full-speed USB Serial/JTAG controller
JTAG debug External JTAG only USB Serial/JTAG built-in
TWAI / CAN 1 1
Ethernet MAC Yes No
SDIO host / slave Yes / Yes / ~20 MB/s (4-bit SDIO) No / No / SD card via SPI ~1 MB/s

platformio

https://docs.platformio.org/en/latest/tutorials/index.html

pio: https://docs.platformio.org/en/latest/core/userguide/index.html - run: https://docs.platformio.org/en/latest/core/userguide/cmd_run.html#examples

ESPHome

https://esphome.io/components/esp32/#configuration-variables - flash_mode : wrong value will cause fail to boot - qio, qout, dio, dout or opi (octal flash chips only)

esptool

uv pip install esptool # D:\github\scripts\elec\

esptool --chip esp32c3 --port COM4 chip-id

    esptool.py v4.8.1
    Serial port COM4
    Connecting....
    Chip is ESP32-C3 (QFN32) (revision v0.4)
    Features: WiFi, BLE, Embedded Flash 4MB (XMC)
    Crystal is 40MHz
    MAC: dc:06:75:aa:6e:e8

    Uploading stub...
    Running stub...
    Stub running...

    Warning: ESP32-C3 has no Chip ID. Reading MAC instead.
    MAC: dc:06:75:aa:6e:e8
    Hard resetting via RTS pin...

esptool --chip esp32c3 --port COM4 flash_id

    Manufacturer: 20
    Device: 4016
    Detected flash size: 4MB

esptool --chip esp32c3 --port COM4 erase_flash

    Erasing flash (this may take a while)...
    Chip erase completed successfully in 17.0s

esptool.py --port COM3 --baud 460800 read_flash 0x00000 0x400000 firmware_backup.bin # 0x400000 4MB / 0x1000000 16MB

D:\天问Block>pyboard\esptool.exe --chip esp32c3 --baud 1500000 --port COM4 write_flash -z --erase-all 0x00 esp32c3.bin

    Compressed 4194304 bytes to 1491998...
    Wrote 4194304 bytes (1491998 compressed) at 0x00000000 in 52.4 seconds (effective 640.7 kbit/s)...
    Hash of data verified.