Our First Program in C (PI5) - Versionsgeschichte

Satyria: /* Compiling the Program with make */

2024-08-23T10:58:40Z

Compiling the Program with make

← Nächstältere Version		Version vom 23. August 2024, 11:58 Uhr
Zeile 41:		Zeile 41:

	You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/C/first.zip		You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/C/first.zip
	{\|
	\|-		-----
	\| style="width: 33%; ~~text-align~~:~~left~~;" \| [[Working with Make and Linker Script\|< Back]] \|\| style="width: 33%" \|[[English\|^ Home]] \|\| style="width: 33%; text-align:right;" \| [[Making the LED Blink in C (PI5)\|Next >]]
			{\| style="width: 100%;
			\| style="width: 33%;" \| [[Working with Make and Linker Script\|< Back (Working with Make and Linker Script)]]
			\| style="width: 33%; text-align:center;" \| [[English\|< Home >]]
			\| style="width: 33%; text-align:right;" \| [[Making the LED Blink in C (PI5)\|Next (Making the LED Blink in C (PI5)) >]]
	\|}		\|}

Satyria: /* Compiling the Program with make */

2024-08-22T07:32:19Z

Compiling the Program with make

← Nächstältere Version		Version vom 22. August 2024, 08:32 Uhr
Zeile 41:		Zeile 41:

	You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/C/first.zip		You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/C/first.zip
			{\|
			\|-
			\| style="width: 33%; text-align:left;" \| [[Working with Make and Linker Script\|< Back]] \|\| style="width: 33%" \|[[English\|^ Home]] \|\| style="width: 33%; text-align:right;" \| [[Making the LED Blink in C (PI5)\|Next >]]
			\|}

Satyria: /* Compiling the Program with make */

2024-08-21T12:03:26Z

Compiling the Program with make

← Nächstältere Version		Version vom 21. August 2024, 13:03 Uhr
Zeile 39:		Zeile 39:
	make		make
	</syntaxhighlight>		</syntaxhighlight>

			You can download the source code as a ZIP file from the following link: https://www.satyria.de/arm/sources/C/first.zip

Satyria: Die Seite wurde neu angelegt: „Our first program will initially do nothing. It will simply run an infinite loop. This serves as a basic building block for all further experiments. I will explain how to create, compile, and run such a program. First, let's check if everything works. == Creating the Source Code == Unfortunately, when working with BareMetal, we can't avoid using Assembly language, even though the Assembly program doesn't do much at the moment. It will be needed later, fo…“

2024-08-21T11:59:04Z

Die Seite wurde neu angelegt: „Our first program will initially do nothing. It will simply run an infinite loop. This serves as a basic building block for all further experiments. I will explain how to create, compile, and run such a program. First, let's check if everything works. == Creating the Source Code == Unfortunately, when working with BareMetal, we can't avoid using Assembly language, even though the Assembly program doesn't do much at the moment. It will be needed later, fo…“

Neue Seite

Our first program will initially do nothing. It will simply run an infinite loop. This serves as a basic building block for all further experiments. I will explain how to create, compile, and run such a program. First, let's check if everything works.

== Creating the Source Code ==
Unfortunately, when working with BareMetal, we can't avoid using Assembly language, even though the Assembly program doesn't do much at the moment. It will be needed later, for example, for interrupt programming.

Open a text editor to write our first Assembly program:

<syntaxhighlight lang="GAS">
//
// The first program
// 01.07.2024 www.satyria.de
//
.section .init // Ensure the linker places this at the beginning of the kernel image
.globl _start // Generates a global label
_start: // The label _start (entry address)

mov sp, #0x80000 // Create a stack of 512KB (524288 bytes)
b main // Branch to "main"
</syntaxhighlight>
Save the file in the default directory under Windows: C:\msys64\home\xxx (where xxx is usually your username). On Linux, you can save the file in the home directory. Name the file first.S. The .S extension indicates that the file is Assembly source code.

Since we want to program in C, let's write a small main function:

<syntaxhighlight lang="C">
//
// main.c
//

int main(void)
{
while (1) {}
}
</syntaxhighlight>
This simply creates an infinite loop.

== Compiling the Program with make ==
Previously, I described how to write a Makefile under "Working with Make and Linker Script." With this Makefile, we can also compile this program if the files "Makefile" and "linker.ld" are present in the directory:
<syntaxhighlight lang="shell">
make
</syntaxhighlight>