Carambola PIN Description PIN Name GPIO Motherboard pin
1 GND
2 LAN0 ETH0_RD+
3 LAN0 ETH0_RD-
4 LAN0 ETH0_TD+
5 LAN0 ETH0_TD-
6 GND
7 LAN1 ETH1_RD+
8 LAN1 ETH1_RD-
9 LAN1 ETH1_TD+
10 LAN1 ETH1_TD-
11 2VD
12 GND
13 SPI SPI_EN GPIO3 1
14 SPI SPI_CLK GPIO4 3
15 SPI SPI_DOUT GPIO5 5
16 SPI SPI_DIN GPIO6 7
17 RESET 9
18 LED WLAN_LED
19 LED ETH1_LED
20 LED ETH0_LED
21 5V
22 3.3V
23 3.3V
24 GND
25 UART1 RIN GPIO14 16
26 UART1 DCD GPIO12 14
27 UART1 DTR GPIO11 12
28 UART1 DSR GPIO13 10
29 UART1 RTS GPIO7 8
30 UART1 CTS GPIO9 6
31 UART1 TXD GPIO8 4
32 UART1 RXD GPIO10 2
33 I2C I2C_SCLK GPIO2 15
34 I2C I2C_SD GPIO1 13
35 UART2 TXD2
36 UART2 RXD2
37 GND
38 USB UDP
39 USB UDM
40 UPHY

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