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board_finder.py
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board_finder.py
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import os
from contextlib import redirect_stdout
from typing import Generator, List, Type
from esptool import ESPLoader, ESP8266ROM, ESP32ROM, DETECTED_FLASH_SIZES
from serial.tools import list_ports as _list_ports
from ampy.core.mpy_boards import MpyBoard, ESP8266Board, ESP32Board
def main(baud: int) -> Generator[MpyBoard, None, None]:
for port in list_ports():
try:
yield detect_board(port, baud)
except StopIteration:
pass
CHIP_CLASSES = {
ESP8266ROM.DATE_REG_VALUE: (ESP8266ROM, ESP8266Board),
ESP32ROM.DATE_REG_VALUE: (ESP32ROM, ESP32Board),
}
def list_ports() -> List[str]:
ports = [
it.device
for it in _list_ports.comports()
if "BLUETOOTH" not in it.device.upper()
]
ports.sort(reverse=True)
return ports
def detect_board(port: str, baud: int) -> MpyBoard:
board_cls: Type[MpyBoard]
rom_cls: Type[ESPLoader]
loader = ESPLoader(port, baud)
try:
connect_attempt(loader)
data_reg = loader.read_reg(ESPLoader.UART_DATA_REG_ADDR)
rom_cls, board_cls = CHIP_CLASSES[data_reg]
esp = rom_cls(loader._port, loader._port.baudrate)
try:
return board_cls(
chip=esp.CHIP_NAME,
description=esp.get_chip_description(),
features=esp.get_chip_features(),
crystal_mhz=esp.get_crystal_freq(),
flash_size=detect_flash_size(esp),
mac=":".join(f"{it:02x}" for it in esp.read_mac()),
port=port,
baud=baud,
board_type="GENERIC",
)
finally:
esp.soft_reset(False)
finally:
loader._port.close()
def detect_flash_size(esp: ESPLoader):
with open(os.devnull, "w") as f, redirect_stdout(f):
esp.flash_spi_attach(0)
return DETECTED_FLASH_SIZES.get(esp.run_spiflash_command(0x9F, b"", 24) >> 16)
def connect_attempt(loader: ESPLoader):
for it in False, True:
with open(os.devnull, "w") as f, redirect_stdout(f):
if loader._connect_attempt(mode="default_reset", esp32r0_delay=it) is None:
return