Linux on Embedded Linux Blog

[Device-Driver-Lichee] 3. Gpioget, controlling an LED with a button

Sat, 13 Jun 2026 06:23:00 +0700

I said we would use a button, but I turned my pile of electronics upside down and found no through-hole buttons, only SMD ones. So in this post I use a potentiometer playing the role of a button :vv

1. Connecting the LED and the potentiometer

[Device-Driver-Lichee] 2. Blink an LED with gpioset, create an LED node in the Device Tree

Sat, 06 Jun 2026 06:46:00 +0700

Okay, after part 1 we have a board that boots to a terminal to tinker with; now for the Hello world of the embedded world. Let's try blinking an LED

1. LicheePi Nano pinout

Search online for sipeed licheepi nano and you will find plenty; this is the pinout from Sipeed

[C-MCU] 2. Memory Layout in a C program

Sat, 27 Dec 2025 06:54:00 +0700

In the previous post we looked at the Build Process of a C program; now I continue with the Memory Layout (the regions of memory)

1. Overview

As in the previous post, when we inspect the elf header of the object file with objdump we see (this is elf64-x86-64, which differs somewhat from an MCU's elf; I will cover that in more detail in the MCU demo below)

[Yocto-STM32MP1] 1. Build and flash core-image-minimal for the STM32MP157

Sat, 06 Dec 2025 07:11:00 +0700

1. Preparing the host machine

My machine runs Ubuntu 22.04.5 LTS (Jammy Jellyfish). I installed it dual boot with windows to make the most of the cores

Following the Yocto Project Reference Manual , section 1.3.2.1, we install the following packages