Portsdown 4 GPIO Connections

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RPi 4 GPIO pin out

GPIO-Pinout-Diagram-2.png

  • Note the RPi4 (only) can be powered with 5v directly on to GPIO 2 and 4.

GPIO Connections for the Portsdown 4

Here is the initial list of GPIO connections.

Pin No BCM No Wiring Pi RPi Pri RPi Alt0 Primary Use Secondary Use Notes
1 - - 3.3v - - - -
2 - - 5v - - - -
3 2 8 GPIO 2 SDA1 - - -
4 - - 5v - - - -
5 3 9 GPIO 3 SCL1 - - -
6 - - 0v - - - -
7 4 7 GPIO 4 GPCLK0 Band D2 - For 8-way switch
8 14 15 GPIO 14 TXD0 ADF5355 LE Elcom LE For future Sig Gen
9 - - 0v - - - -
10 15 16 GPIO 15 RXD0 - Active low
11 17 0 GPIO 17 FL1 Langstone PTT Active low
12 18 1 GPIO 18 SPI6_CE0_N Transmit Demand Langstone CW Key -
13 27 2 GPIO 27 SD0_DAT3 "Active" LED - Active high
14 - - 0v - - - -
15 22 3 GPIO 22 SD0_CLK Shutdown Button - Active high
16 23 4 GPIO 23 SD0_CMD - Langstone band D3 -
17 - - 3.3v - - - -
18 24 5 GPIO 24 SD0_DAT0 - Langstone band D2 -
19 10 12 GPIO 10 SPI0_MOSI - Langstone band D1 -
20 - - 0v - - - -
21 9 13 GPIO 9 SPI0_MISO - Langstone band D0 -
22 25 6 GPIO 25 SD0_DAT1 - Langstone band D2 -
23 11 14 GPIO 11 SPI0_SCLK - - -
24 8 10 GPIO 8 SPI0_CE0_N - - -
25 - - 0v - - - -
26 7 11 GPIO 7 SPI0_CE1_N - - -
27 0 30 ID_SD SDA0 ADF4351 LE - (Reserved)
28 1 31 ID_SC SCL0 - Langstone band D7 -
29 5 21 GPIO 5 GPCLK0 spi clock - -
30 - - 0v - - - -
31 6 22 GPIO 6 GPCLK2 spi data - -
32 12 26 GPIO 12 PWM0 Band D0 - -
33 13 23 GPIO 13 PWM1 - - -
34 - - 0v - - - -
35 19 24 GPIO 19 SPI6_MESO - Langstone band D6 -
36 16 27 GPIO 16 FL0 Band D1 - -
37 26 25 GPIO 26 SD0_DAT2 - - -
38 20 28 GPIO 20 SPI6_MOSI - - -
39 - - 0v - - - -
40 21 29 GPIO 21 SPI6_SCLK TX LED/PTT Drive out - -

Note that the GPIO pin names are markedly different from the RPi 3B. Each pin on the RPi4 GPIO can be referred to in many ways: its physical pin number, the Broadcom I/O number, the Wiring Pi number or the primary or alternate names. Source for GPIO designations was the Raspberry Pi 4 Model B datasheet.