Difference between revisions of "Portsdown 4 GPIO Connections"

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m (GPIO Connections for the Portsdown 4)
(GPIO Connections for the Portsdown 4: link to gp io pcb page)
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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 32 and 33.  
 
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 32 and 33.  
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[[GPIO_breakout|J0x terminal block identities relate to the BATC GPIO breakout PCB from the club shop..]]
  
 
Unused Willow breakout boards may work with Portsdown 4 because they needed extra connections to pins 27 & 28 on Portsdown 2018. These aren't required on P4 as noted here.  
 
Unused Willow breakout boards may work with Portsdown 4 because they needed extra connections to pins 27 & 28 on Portsdown 2018. These aren't required on P4 as noted here.  
 
   
 
   
 
Pins 36, 37 & 38 may still be connected - G8GKQ has not knowingly disabled them - for extra DO,  D1 & D2 connections - worth a try.
 
Pins 36, 37 & 38 may still be connected - G8GKQ has not knowingly disabled them - for extra DO,  D1 & D2 connections - worth a try.

Revision as of 22:04, 8 February 2021

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 J0x Terminal blocks on GPIO breakout board.
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 T for Transverter on J07. 10K resistor to GND
8 14 15 GPIO 14 TXD0 ADF5355 LE Elcom LE For future Sig Gen
9 - - 0v - - - -
10 15 16 GPIO 15 RXD0 Atten LE - 10 on J07
11 17 0 GPIO 17 FL1 - Langstone PTT Active low
12 18 1 GPIO 18 SPI6_CE0_N Transmit Demand Langstone CW Key 12 on J07
13 27 2 GPIO 27 SD0_DAT3 "Active" LED - Active high J06 S/D LED
14 - - 0v - - - -
15 22 3 GPIO 22 SD0_CLK Shutdown Button - Active high J06
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) (was Langstone band D7) DO NOT CONNECT
29 5 21 GPIO 5 GPCLK0 spi clock - CLK on J04. 1K resistor.
30 - - 0v - - - -
31 6 22 GPIO 6 GPCLK2 spi data - DAT on J04. 1K resistor.
32 12 26 GPIO 12 PWM0 new Band D0 new Langstone band D7 Band select LSB now to I on J03
33 13 23 GPIO 13 PWM1 new ADF4351 LE - Q on J03. 1K resistor.
34 - - 0v - - - -
35 19 24 GPIO 19 SPI6_MESO Band D1 Langstone band D6 Band Select MSB on J05
36 16 27 GPIO 16 FL0 - - SR select LSB D0 on J02
37 26 25 GPIO 26 SD0_DAT2 - - SR select NSB D1 on J02
38 20 28 GPIO 20 SPI6_MOSI - - SR select MSB D2 on J02
39 - - 0v - - - -
40 21 29 GPIO 21 SPI6_SCLK TX LED/PTT Drive out - TX LED J05

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 32 and 33.

J0x terminal block identities relate to the BATC GPIO breakout PCB from the club shop..

Unused Willow breakout boards may work with Portsdown 4 because they needed extra connections to pins 27 & 28 on Portsdown 2018. These aren't required on P4 as noted here.

Pins 36, 37 & 38 may still be connected - G8GKQ has not knowingly disabled them - for extra DO, D1 & D2 connections - worth a try.