iDryerRP2040 Port Configuration

Where to configure

MENU -> GLOBAL -> PORT CONFIG

• PORT 1
• PORT 2
• PORT 3

Mode values:

• 0 = EXT — additional dryer module
• 1 = SCR — screen
• 2 = SCL — scales (HX711)
• 3 = LNK — Link (UART: WiFi/Touch/portal)

Important behavior

Changing PORT CONFIG does not switch hardware roles instantly.

Firmware snapshots port configuration at startup, and runtime works from that snapshot until the next reboot.

Result: after changing PORT CONFIG, reboot the device.

Code-level constraints

Validation in UI and port logic allows only the following rules:

1. PORT 1: only EXT or SCL.
2. PORT 2: only EXT, SCL, or LNK.
3. PORT 3: only SCR or LNK.
4. Roles SCR, SCL, LNK are unique (only one port can have each role).
5. PORT 2 = EXT is allowed only if PORT 1 = EXT.

All valid combinations

Below is the full list of valid configurations that match current rules.

#	PORT 1	PORT 2	PORT 3	Screen	Link	Scales	Max UNITS
1	EXT	EXT	SCR	Yes	No	No	3
2	EXT	SCL	SCR	Yes	No	Port2	2
3	EXT	LNK	SCR	Yes	Port2	No	2
4	SCL	LNK	SCR	Yes	Port2	Port1	1
5	EXT	EXT	LNK	No	Port3	No	3
6	EXT	SCL	LNK	No	Port3	Port2	2

UNITS note:

• UNITS is derived from the EXT chain:
• base is always 1 (built-in module);
• if PORT1=EXT -> up to 2;
• if PORT2=EXT as well -> up to 3.

Practical meaning

• If you need a local screen, PORT 3 must be SCR.
• If Link is on PORT 3, screen is unavailable on that port.
• Scales can be connected only where the port mode is SCL (Port1 or Port2).
• Invalid combinations are usually blocked in UI during editing.

Recommended scenarios

1. Screen + Link + 1 module + scales PORT1=SCL, PORT2=LNK, PORT3=SCR (max UNITS=1).

2. Screen + 2 modules + scales PORT1=EXT, PORT2=SCL, PORT3=SCR (max UNITS=2).

3. No screen, Link-focused + 2 modules + scales PORT1=EXT, PORT2=SCL, PORT3=LNK (max UNITS=2).

4. Maximum modules (3), no scales

5. with screen: PORT1=EXT, PORT2=EXT, PORT3=SCR
6. with Link: PORT1=EXT, PORT2=EXT, PORT3=LNK

If configuration is broken

If a non-working configuration was saved by mistake (mass module errors, menu lockup), use:

• install.idryer.org -> Erase Firmware
• then immediately Flash Firmware
• then set correct PORT CONFIG again