Portsdown 4 GPIO Connections
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RPi 4 GPIO pin out
- 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.