How to check running Raspberry Pi OS version, 32 bit or 64 bit.

To check the bit size (32 bit or 64 bit) of the running Raspberry Pi OS, you can enter the commands:

$ uname -m

aarch64

or:

$ arch

aarch64

You can also check the bit size of the Linux kernel with:

$ getconf LONG_BIT

64

Tested on Raspberry Pi 4B running Raspberry Pi OS 64-bit (bullseye):

Tested on Raspberry Pi 4B running Raspberry Pi OS 32-bit (buster):

Simple exercise to control GPIO on Raspberry Pi, C and Python

Simple exercise to control GPIO on Raspberry Pi, tested on Raspberry Pi Zero 2 W running "Raspbian GNU/Linux 11 (bullseye)".

blink.c, in C language:

#include <stdio.h>
#include <pigpio.h>

#define led 17

int main(void){
	printf("- IO Test on\n");
	printf("- Raspberry Pi Zero 2 W\n");
	
	gpioInitialise();
	gpioSetMode(led, PI_OUTPUT);
	
	while(1){
		gpioWrite(led, 1);
		time_sleep(1);
		gpioWrite(led, 0);
		time_sleep(1);
	}

}

To compile it link to pigpio library:

$ gcc blink.c -o blink -lpigpio

To run it with sudo:
$ sudo ./blink

py_LED.py, in Python:

from gpiozero import LED
from time import sleep

led = LED(17)

while True:
    led.on()
    sleep(1)
    led.off()
    sleep(1)

My Raspberry Pi Zero 2 W

 My Raspberry Pi Zero 2 W received:

Raspberry Pi Zero 2 W installed new 32-bit Raspberry Pi OS (bullseye), running neofetch:

---

Check Board name and version using cpuinfo:

pi@raspberrypi:~ $ cat /proc/cpuinfo
processor	: 0
model name	: ARMv7 Processor rev 4 (v7l)
BogoMIPS	: 38.40
Features	: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 4

processor	: 1
model name	: ARMv7 Processor rev 4 (v7l)
BogoMIPS	: 38.40
Features	: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 4

processor	: 2
model name	: ARMv7 Processor rev 4 (v7l)
BogoMIPS	: 38.40
Features	: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 4

processor	: 3
model name	: ARMv7 Processor rev 4 (v7l)
BogoMIPS	: 38.40
Features	: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 4

Hardware	: BCM2835
Revision	: 902120
Serial		: 000000009470cd94
Model		: Raspberry Pi Zero 2 Rev 1.0

Check OS version using /etc/os-release:

pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

---

Related:

• Test GPIO Control

Documents:

• Getting started guide
• Raspberry Pi Zero 2 W product brief