Portsdown 4 GPIO Connections
Revision as of 15:15, 12 September 2020 by G8GKQ (talk | contribs) (→GPIO Connections for the Portsdown 4)
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 | Langstone band D5 | - |
| 8 | 14 | 15 | GPIO 14 | TXD0 | ADF5355 LE | Elcom LE | For future Sig Gen |
| 9 | - | - | 0v | - | - | - | - |
| 10 | 15 | 16 | GPIO 15 | RXD0 | Atten LE | - | - |
| 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 D4 | - |
| 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 | (was ADF4351 LE) | - | DO NOT CONNECT |
| 28 | 1 | 31 | ID_SC | SCL0 | (was Band D0) | Langstone band D7 | DO NOT CONNECT |
| 29 | 5 | 21 | GPIO 5 | GPCLK0 | spi clock | - | - |
| 30 | - | - | 0v | - | - | - | - |
| 31 | 6 | 22 | GPIO 6 | GPCLK2 | spi data | - | - |
| 32 | 12 | 26 | GPIO 12 | PWM0 | new Band D0 | - | - |
| 33 | 13 | 23 | GPIO 13 | PWM1 | new ADF4351 LE | - | - |
| 34 | - | - | 0v | - | - | - | - |
| 35 | 19 | 24 | GPIO 19 | SPI6_MESO | Band D1 | Langstone band D6 | - |
| 36 | 16 | 27 | GPIO 16 | FL0 | - | - | - |
| 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.
Note that no connections should be made to GPIO Pins 27 and 28, otherwise the RPi might get stuck on the Rainbow Screen at boot. Previous connections to these pins are being moved to other pins TBD.