Multifunction Ports on the Raspberry Pi 4B, Pinout and Alternate Name Functions

Multifunction Ports on the Raspberry Pi 4B,  Pinout and Alternate Name Functions

https://raspberrypi.stackexchange.com/questions/104464/where-are-the-uarts-on-the-raspberry-pi-4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269104  John R.  forum Post

https://www.studiopieters.nl/raspberry-pi-4-model-b-pinout/  Sudio Pieters Netherlands Raspi4B pinout.

https://lambdaland.org/posts/2020-12-23_freebsd_rpi4/  2020 FreeBSD install, Tier 3 now Tier 1,  Rust Language setup.

https://github.com/raspberrypi/linux/blob/7f465f823c2ecbade5877b8bbcb2093a8060cb0e/arch/arm/boot/dts/bcm2711.dtsi#L41

Interrupt Code for Raspberry Pi 4 from Raspberry Pi Linux

As Joan has stated only 1 of UART0/1 is accessible (UART0 /dev/ttyAMA0 is connected to Bluetooth on later model Pi).

There are additional UART on the Pi4.

Raspberry Pi4 UART is a more up to date answer.

https://raspberrypi.stackexchange.com/questions/104464/where-are-the-uarts-on-the-raspberry-pi-4/104466#104466

The following summarises the pin usage:-

        TXD RXD CTS RTS     Board Pins
uart0   14  15              8   10
uart1   14  15              8   10
uart2   0   1   2   3       27  28  (I2C)
uart3   4   5   6   7       7   29
uart4   8   9   10  11      24  21  (SPI0)
uart5   12  13  14  15      32  33  (gpio-fan)

I doubt UART2 would be usable as GPIO0/1 are used for HATs (and shown as reserved).
I suspect that the SDA0/SCL0 connected to these pins are used for other internal functions.

I have extracted the GPIO Alternate Functions from the data sheet, as I have been unable to find any existing list.

This shows the mode and function of each.

   ALT0       ALT1       ALT2       ALT3       ALT4       ALT5      
 0 SDA0       SA5        PCLK       SPI3_CE0_N TXD2       SDA6      
 1 SCL0       SA4        DE         SPI3_MISO  RXD2       SCL6      
 2 SDA1       SA3        LCD_VSYNC  SPI3_MOSI  CTS2       SDA3      
 3 SCL1       SA2        LCD_HSYNC  SPI3_SCLK  RTS2       SCL3      
 4 GPCLK0     SA1        DPI_D0     SPI4_CE0_N TXD3       SDA3      
 5 GPCLK1     SAO        DPI_D1     SPI4_MISO  RXD3       SCL3      
 6 GPCLK2     SOE_N      DPI_D2     SPI4_MOSI  CTS3       SDA4      
 7 SPI0_CE1_N SWE_N      DPI_D3     SPI4_SCLK  RTS3       SCL4      
 8 SPI0_CE0_N SDO        DPI_D4     _          TXD4       SDA4      
 9 SPI0_MISO  SD1        DPI_D5     _          RXD4       SCL4      
10 SPI0_MOSI  SD2        DPI_D6     _          CTS4       SDA5      
11 SPI0_SCLK  SD3        DPI_D7     _          RTS4       SCL5      
12 PWM0       SD4        DPI_D8     SPI5_CE0_N TXD5       SDA5      
13 PWM1       SD5        DPI_D9     SPI5_MISO  RXD5       SCL5      
14 TXD0       SD6        DPI_D10    SPI5_MOSI  CTS5       TXD1      
15 RXD0       SD7        DPI_D11    SPI5_SCLK  RTS5       RXD1      
16 FL0        SD8        DPI_D12    CTS0       SPI1_CE2_N CTS1      
17 FL1        SD9        DPI_D13    RTS0       SPI1_CE1_N RTS1      
18 PCM_CLK    SD10       DPI_D14    SPI6_CE0_N SPI1_CE0_N PWM0      
19 PCM_FS     SD11       DPI_D15    SPI6_MISO  SPI1_MISO  PWM1      
20 PCM_DIN    SD12       DPI_D16    SPI6_MOSI  SPIl_MOSI  GPCLK0    
21 PCM_DOUT   SD13       DPI_D17    SPI6_SCLK  SPI1_SCLK  GPCLK1    
22 SD0_CLK    SD14       DPI_D18    SD1_CLK    ARM_TRST   SDA6      
23 SD0_XMD    SD15       DPI_D19    SD1_CMD    ARM_RTCK   SCL6      
24 SD0_DATO   SD16       DPI_D20    SD1_DAT0   ARM_TDO    SPI3_CE1_N
25 SD0_DAT1   SD17       DPI_D21    SD1_DAT1   ARM_TCK    SPI4_CE1_N
26 SD0_DAT2   TE0        DPI_D22    SD1_DAT2   ARM_TDI    SPI5_CE1_N
27 SD0_DAT3   TE1        DPI_D23    SD1_DAT3   ARM_TMS    SPI6_CE1_N
Location: Brooks, OR, USA

Comments

Post a Comment

Popular posts from this blog

FreeBSD 14.0 Compiling kernel for Raspberry Pi 4B

Image
 FreeBSD 14.0 Compiling kernel for Raspberry Pi 4B in 4 easy steps, updated December 13, 2022 Start with a downloaded RPI image .img FreeBSD snapshot file you can write into a USB Flash drive.   decompress the file with  command:     xz  -dv freebsd_raspi.img Boot  the from USB Flash drive image built from a  Snapshot image   Use the running Snapshot image FreeBSD use "bsdinstall" to download and install FreeBSD, over the ethernet cable connected to your router, to the external usb Hard drive or SSD drive. Shutdown reboot,  remove the USB Flash drive stick from the RasPi4B, reboot from the external usb Hard drive or SSD drive. freebsd.org/where   https://download.freebsd.org/snapshots/arm64/aarch64/ISO-IMAGES/14.0/ Here is the September 9, 2022 FreeBSD 14.0 Snapshot image for RPI 3 or 4, right click on to "save as" a file on your local hard drive.  or use either of the commands:  curl -O https://url_link    wget -c https://url_link https://download.freebsd.org/snaps
Read more

HDMI Audio sound patches into GhostBSD source code /usr/ghost14/ghostbsd-src SOLVED Jan20 2024

Image
HDMI Audio sound patches into GhostBSD source code /usr/ghost14/ghostbsd-src   January 19, 2024  SOLVED Jan 20, 2024 Applied the three patches manually: D36431, D37878 ,  D37879      D36431 date was September 2, 2022 D37879 date was December 26, 2022 D37878 date was December 26, 2022 fetch https://reviews.freebsd.org/D36431?download=true wget -c https://reviews.freebsd.org/file/data/cc5gnx6lx7pcvduupcbj/PHID-FILE-ombv7ctfqm3de2dyqgeq/D36431.diff fetch https://reviews.freebsd.org/D37878?download=true wget -c https://reviews.freebsd.org/file/data/bicc7vdmyzwnylvq5soa/PHID-FILE-wc6uoit423pb3lpagwsq/D37878.diff fetch https://reviews.freebsd.org/D37879?download=true wget -c https://reviews.freebsd.org/file/data/ln65jga5vwpz4j2ijmnx/PHID-FILE-cnp5deghq74u3kcfwtxs/D37879.diff Standard update to /usr/src  code to the latest git -C /usr/src pull --ff-only root@usr/src # git -C /usr/src pull --ff-only Already up to date. Go to bottom of this post and read  https://ghostbsd-arm64.blogspot.com/202
Read more

How to install GhostBSD-Arm64 into a USB Flash Drive stick April 24, 2024 update edition.

Image
 How to install GhostBSD-Arm64 into a USB Flash Drive stick January 5, 2024 edition, update April 24 2024 The steps below are based on using a Raspberry Pi 4B,3B,400 computer, running sh shell scripts using FreeBSD or GhostBSD-ARM64.    1.)  You can  may run these scripts on a standard X86_64 PC booting a live image of https://GhostBSD.org/download    " latest build " or the regular released version, then written to a USB flash Drive for booting up a live media version of GhostBSD or    booting a snapshot .ISO image of FreeBSD. https://freebsd.org/where    FreeBSD.org/where   13.2-RELEASE or 14.0-RELEASE https://download.freebsd.org/releases/amd64/amd64/ISO-IMAGES/14.0/ 2.)  Balena Etcher Tool for Windows and Linux to burn an image file into a USB flash drive https://etcher.balena.io/ 3.)   h ttp://ghostbsdarm64.hopto.org/packages/   Directory of  images you can download. http://ghostbsdarm64.hopto.org/packages/Ghost14_5G_selfbuilt_raspi4b_Feb27_2.img.xz     Download this 72
Read more