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Fix board detection by not using i2c scan

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i2c scanning all the devices can confuse some of them,
such as the OV* camera's. Better to selectively scan just the ones
we want to know about, plus, it's also faster.
This commit is contained in:
Thomas Farstrike
2026-02-08 18:20:48 +01:00
parent e8de45312f
commit d453e778bd
1 changed files with 32 additions and 11 deletions
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internal_filesystem/lib/mpos/main.py
+32 -11
View File
@@ -26,31 +26,52 @@ def init_rootscreen():
img.set_blend_mode(lv.BLEND_MODE.DIFFERENCE)
img.center()
def single_address_i2c_scan(i2c_bus, address):
"""
Scan a specific I2C address to check if a device is present.
Args:
i2c_bus: An I2C bus object (machine.I2C instance)
address: Integer address to scan (0-127)
Returns:
True if a device responds at the specified address, False otherwise
"""
try:
# Attempt to write a single byte to the address
# This will raise an exception if no device responds
i2c_bus.writeto(address, b'')
return True
except OSError:
# No device at this address
return False
except Exception as e:
# Handle any other exceptions gracefully
print(f"single_address_i2c_scan: error scanning address 0x{address:02x}: {e}")
return False
def detect_board():
import sys
if sys.platform == "linux" or sys.platform == "darwin": # linux and macOS
return "linux"
elif sys.platform == "esp32":
from machine import Pin, I2C
return "matouch_esp32_s3_2_8" # i2c scan confuses the camera so hard-code for now
i2c0 = I2C(0, sda=Pin(39), scl=Pin(38), freq=400000)
devices = set(i2c0.scan()) # causes a "ghost" device to appear on 0x20 and breaks the camera
if {0x14} <= devices or {0x5D} <= devices: # "ghost" device or real GT911
return "matouch_esp32_s3_2_8"
i2c0 = I2C(0, sda=Pin(48), scl=Pin(47)) # on matouch_esp32_s3_2_8, this "finds" devices at all addresses 8-119 so only do this after matouch_esp32_s3_2_8
if {0x15, 0x6B} <= set(i2c0.scan()): # touch screen and IMU (at least, possibly more)
i2c0 = I2C(0, sda=Pin(48), scl=Pin(47))
if single_address_i2c_scan(i2c0, 0x15) and single_address_i2c_scan(i2c0, 0x6B): # CST816S touch screen and IMU
return "waveshare_esp32_s3_touch_lcd_2"
i2c0 = I2C(0, sda=Pin(39), scl=Pin(38))
if single_address_i2c_scan(i2c0, 0x14) or single_address_i2c_scan(i2c0, 0x5D): # "ghost" or real GT911 touch screen
return "matouch_esp32_s3_2_8"
i2c0 = I2C(0, sda=Pin(9), scl=Pin(18))
if {0x6B} <= set(i2c0.scan()): # IMU (plus possibly the Communicator's LANA TNY at 0x38)
if single_address_i2c_scan(i2c0, 0x6B): # IMU (plus possibly the Communicator's LANA TNY at 0x38)
return "fri3d_2024"
# default: if {0x6A} <= set(i2c0.scan()): # IMU (plus a few others, to be added later, but this should work)
# default: if single_address_i2c_scan(i2c0, 0x6A): # IMU but currently not installed
return "fri3d_2026"
board = detect_board()
print(f"Initializing {board} hardware")
DeviceInfo.set_hardware_id(board)