0 — PL_IO_NUM_0_RX0_INT0⁽¹⁾:

General-purpose I/O line 0 (P0.0). This line is also the RX/W1in/din input of serial port⁽³⁾ 0 and interrupt line 0.

1 — PL_IO_NUM_1_TX0_INT1⁽²⁾:

General-purpose I/O line 1 (P0.1). This line is also the TX/W1out/dout output of serial port⁽³⁾ 0 and interrupt line 1.

2 — PL_IO_NUM_2_RX1_INT2⁽¹⁾:

General-purpose I/O line 2 (P0.2). This line is also the RX/W0&1in/din input of serial port⁽³⁾ 1 and interrupt line 2.

3 — PL_IO_NUM_3_TX1_INT3⁽²⁾:

General-purpose I/O line 3 (P0.3). This line is also the TX/W1out/dout output of serial port⁽³⁾ 1 and interrupt line 3.

4 — PL_IO_NUM_4_RX2_INT4⁽¹⁾:

General-purpose I/O line 4 (P0.4). This line is also the RX/W0&1in/din input of serial port⁽³⁾ 2 and interrupt line 4.

5 — PL_IO_NUM_5_TX2_INT5⁽²⁾:

General-purpose I/O line 5 (P0.5). This line is also the TX/W1out/dout output of serial port⁽³⁾ 2 and interrupt line 5.

6 — PL_IO_NUM_6_RX3_INT6⁽¹⁾:

Not implemented.

7 — PL_IO_NUM_7_EMPTY:

Not implemented.

8 — PL_IO_NUM_8_PWROUT:

Not implemented.

9 — PL_IO_NUM_9:

Pin 8 on the wireless interface connector.

10 — PL_IO_NUM_10:

Pin 6 on the wireless interface connector.

11 — PL_IO_NUM_11:

The RST line of the wireless interface.

12 — PL_IO_NUM_12:

The DI line of the wireless interface.

13 — PL_IO_NUM_13:

The DO line of the wireless interface.

14 — PL_IO_NUM_14:

The CLK line of the wireless interface.

15 — PL_IO_NUM_15:

The CS line of the wireless interface.

16 — PL_IO_NUM_16:

Pin 9 on the wireless interface connector.

17 — PL_IO_NUM_17_RSMD:

Serial port mode: HIGH for RS422/485, LOW for RS232.

18 — PL_IO_NUM_18_HDFD:

Serial port mode: HIGH for full-duplex, LOW for half-duplex.

19 — PL_IO_NUM_19_SB1:

LED bar, LED#1 (the "weakest signal" LED).

20 — PL_IO_NUM_20_SB2:

LED bar, LED#2.

21 — PL_IO_NUM_21_SB3:

LED bar, LED#3.

22 — PL_IO_NUM_22_SB4:

LED bar, LED#4.

23 — PL_IO_NUM_23_SB5:

LED bar, LED#5 (the "strongest signal" LED).

24 — PL_IO_NUM_24_OLED_D0:

OLED dispay data bus, line 0 (P0.0).

25 — PL_IO_NUM_25_OLED_D1:

OLED dispay data bus, line 1 (P0.1).

26 — PL_IO_NUM_26_OLED_D2:

OLED dispay data bus, line 2 (P0.2).

27 — PL_IO_NUM_27_OLED_D3:

OLED dispay data bus, line 3 (P0.3).

28 — PL_IO_NUM_28_OLED_D4:

OLED dispay data bus, line 4 (P0.4).

29 — PL_IO_NUM_29_OLED_D5:

OLED dispay data bus, line 5 (P0.5).

30 — PL_IO_NUM_30_OLED_D6:

OLED dispay data bus, line 6 (P0.6).

31 — PL_IO_NUM_31_OLED_D7:

OLED dispay data bus, line 7 (P0.7).

32 — PL_IO_NUM_32_OLED_CS:

OLED display, CS control line.

33 — PL_IO_NUM_33_OLED_RD:

OLED display, RD control line.

34 — PL_IO_NUM_34_OLED_WR:

OLED display, WR control line.

35 — PL_IO_NUM_35_OLED_DC:

OLED display, DC control line.

36 — PL_IO_NUM_36_OLED_RST:

OLED display, RST control line.

37 — PL_IO_NUM_37_CO:

General-purpose I/O line 37 (does not belong to any 8-bit port), also a square wave output controlled by the beep. object. This output drives a buzzer.

38 — PL_IO_NULL:

This is a NULL line that does not physically exist. The state of this line is always detected as LOW. Setting this line has no effect.