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Learning C

Lth — Sun, 20 Sep 2026 01:35:31 GMT

Hello World - Desktop vs. MCU

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Lth — Sun, 20 Sep 2026 00:40:48 GMT

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Learning C

Lth — Sun, 20 Sep 2026 00:39:48 GMT

Learning C

Lth — Sun, 20 Sep 2026 00:32:15 GMT

Created page with "Category:C Category:Work in progress{{metadesc|Learning C tutorial}} == Hello World - Desktop vs. MCU == When learning any programming language, the first "project" wi..."

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[[Category:C]][[Category:Work in progress]]{{metadesc|Learning C tutorial}}
== Hello World - Desktop vs. MCU ==

When learning any programming language, the first "project" will typically be a small program which prints out "Hello World!".

=== Standard UNIX ===

On a standard UNIX system, that program, implemented in standard C, would typically look something like this:

<syntaxhighlight lang="C" line>
#include <stdio.h>

int main(void) {
printf("Hello World!\n");
return 0;
}
</syntaxhighlight>

Most UNIX like systems have (or bloody should have) a C compiler, typically named ''cc'', so above ''hello.c'' can be built into a binary executable thus:

<syntaxhighlight lang="Bash">
$ cc hello.c -o hello
</syntaxhighlight>

This will produce a binary ''hello'', which can now be executed:

<syntaxhighlight lang="Bash">
$ ./hello
Hello World!
</syntaxhighlight>

=== Embedded ===

To be added

== Variables & Fixed-Width Types ==

To be added

== Control Flow & Decision Making ==

To be added

== Loops & Iteration ==

To be added

== Functions & Modular Code ==

To be added

== Bitwise Operations Masterclass ==

To be added

== Pointers Demystified ==

To be added

== Arrays & Pointer Arithmetic ==

To be added

== Structs & Memory Alignment ==

To be added

== The volatile Keyword ==

To be added

== Type Casting & Unions ==

To be added

== Function Pointers & Callbacks ==

To be added

== Enums & State Machines ==

To be added

== Dynamic Memory vs. Static Allocation ==

To be added

== Macros, Pragmas & Preprocessor ==

To be added

== Miscellaneous Links ==

To be added

User:Lth/Learn C

Lth — Sun, 20 Sep 2026 00:25:49 GMT

Hello World - Desktop vs. MCU

User:Lth/Learn C

Lth — Sat, 19 Sep 2026 23:54:48 GMT

Created page with " == Hello World - Desktop vs. MCU == To be added == Variables & Fixed-Width Types == To be added == Control Flow & Decision Making == To be added == Loops & Iteration ==..."

New page

== Hello World - Desktop vs. MCU ==

To be added

== Variables & Fixed-Width Types ==

To be added

== Control Flow & Decision Making ==

To be added

== Loops & Iteration ==

To be added

== Functions & Modular Code ==

To be added

== Bitwise Operations Masterclass ==

To be added

== Pointers Demystified ==

To be added

== Arrays & Pointer Arithmetic ==

To be added

== Structs & Memory Alignment ==

To be added

== The volatile Keyword ==

To be added

== Type Casting & Unions ==

To be added

== Function Pointers & Callbacks ==

To be added

== Enums & State Machines ==

To be added

== Dynamic Memory vs. Static Allocation ==

To be added

== Macros, Pragmas & Preprocessor ==

To be added

== Miscellaneous Links ==

To be added

The C prefix for binary constants (0b)

Lth — Sat, 19 Sep 2026 23:00:31 GMT

Examples

C Designated Initializer

Lth — Fri, 18 Sep 2026 13:24:47 GMT

The solution: Designated Initializer

C Designated Initializer

Lth — Fri, 18 Sep 2026 12:12:55 GMT

Created page with "Category:C{{metadesc|C Designated Initializer C99 feature}} C Designated Initializers was a feature introduced in the C99 standard."

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[[Category:C]]{{metadesc|C Designated Initializer C99 feature}}
[[C Designated Initializer]]s was a feature introduced in the C99 standard.

STM32

Lth — Fri, 18 Sep 2026 11:41:43 GMT

Video

Streamline MCU STM32H723

Niclas — Thu, 17 Sep 2026 13:05:41 GMT

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Niclas — Thu, 17 Sep 2026 13:01:07 GMT

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Niclas — Thu, 17 Sep 2026 13:00:33 GMT

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Designated Initializers in C

Lth — Thu, 17 Sep 2026 04:34:29 GMT

Created page with "{{Video |series=STM32 Short Video |number=14 |title=Designated Initializers in C |youtube-id=CGblBwJowDk |description=While digging into TinyUSB descriptors, I came across an..."

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{{Video
|series=STM32 Short Video
|number=14
|title=Designated Initializers in C
|youtube-id=CGblBwJowDk
|description=While digging into TinyUSB descriptors, I came across an unusual syntax that turns out to be one of the most useful features in modern C: Designated Initializers (introduced in C99). In this video, we explore how designated initializers work with arrays and enums, why they prevent common synchronization bugs in embedded firmware, and how they automatically handle array sizing and default values.
}}

STM32 USB Ethernet: How to Connect to Your Network

Lth — Mon, 14 Sep 2026 08:21:45 GMT

Created page with "{{Video |series=STM32 Tutorial Video |number=102 |title=STM32 USB Ethernet: How to Connect to Your Network |youtube-id=pLAWPLTEq3M |description=In this video we will implement..."

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{{Video
|series=STM32 Tutorial Video
|number=102
|title=STM32 USB Ethernet: How to Connect to Your Network
|youtube-id=pLAWPLTEq3M
|description=In this video we will implement Ethernet over USB using TinyUSB and LWIP. We will also create a HTTP server and creating 3 dynamic endpoints including one which will toggle the onboard LED.
}}

RP2350 USB Ethernet: How to Connect to Your Network

Lth — Sat, 12 Sep 2026 02:31:38 GMT

Created page with "{{Video |series=RP Pico Video |number=18 |title=RP2350 USB Ethernet: How to Connect to Your Network |youtube-id=QHDft1eWAk4 |description=We need no WiFi or Ethernet to get a R..."

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{{Video
|series=RP Pico Video
|number=18
|title=RP2350 USB Ethernet: How to Connect to Your Network
|youtube-id=QHDft1eWAk4
|description=We need no WiFi or Ethernet to get a RP2350 on a network. In this video you will learn how.
}}

Streamline Peripheral Pin Mapping

Niclas — Fri, 11 Sep 2026 15:49:33 GMT

CAN

Streamline Header Mapping

Niclas — Fri, 11 Sep 2026 15:41:45 GMT

@@ Line 12: / Line 12: @@
 Developing simple programs for our [[STM32 Tutorial Videos]] we have often used the '0b' prefix to write binary constants, for example:
-<pre>
+<syntaxhighlight lang="C">
-uint8_t something = 0b10101010;
+    uint8_t something = 0b10101010;
-</pre>
+</syntaxhighlight>
 When developing code for embedded systems, this is a particularly convenient feature.  In datasheets for various peripherals, one will often come across specifications like this (from the CS43L22 datasheet):
@@ Line 24: / Line 24: @@
 In this example a few macros like:
-<pre>
+<syntaxhighlight lang="C">
 #define CC43L22_INT_CTL_1_DACDIF_SOMETHING      0b00000100
 #define CC43L22 INT_CTL_1_DACDIF SOMETHING_ELSE 0b00001000
-</pre>
+</syntaxhighlight>
 Would obviously make it a lot easier to relate to the datasheet.

← Older revision		Revision as of 13:24, 18 September 2026
(11 intermediate revisions by the same user not shown)
Line 1:		Line 1:
−	[[Category:C]]{{metadesc\|C Designated Initializer C99 feature}}	+	[[Category:C]][[Category:Work in progress]]{{metadesc\|C Designated Initializer C99 feature}}
−	[[C Designated Initializer]]s ~~was~~ a feature introduced in the C99 standard.	+	[[C Designated Initializer]]s is a feature which was introduced in the C99 standard.
		+
		+	== The problem ==
		+
		+	It is quite common in C programs, to include an array of strings:
		+
		+	<syntaxhighlight lang="C">
		+	// Strings for debug
		+	char *str[] = {
		+	"Program start",
		+	"Some stuff happened",
		+	"Some other stuff happened",
		+	"Disastrous error",
		+	"Program end"
		+	};
		+	</syntaxhighlight>
		+
		+	These strings can now be used throughout the program by referencing the array element.
		+
		+	<syntaxhighlight lang="C">
		+	printf("%s\n", str[0]);
		+	</syntaxhighlight>
		+
		+	With only a few strings, this '''can''' be managed, but it is quite obvious that as the list grow longer, it will become unmanageable, and also statements like: "printf("%s\n", str[0]);" are not very readable.
		+
		+	To make the code more readable, it is common to include an enum or defines to refer to the array element.
		+
		+	<syntaxhighlight lang="C">
		+	typedef enum {
		+	STR_START = 0,
		+	STR_STUFF = 1,
		+	STR_OTHER = 2,
		+	STR_DISASTER = 3,
		+	STR_END = 4
		+	} str_idx_t;
		+
		+	// Strings for debug
		+	char *str[] = {
		+	"Program start",
		+	"Some stuff happened",
		+	"Some other stuff happened",
		+	"Disastrous error",
		+	"Program end"
		+	};
		+	</syntaxhighlight>
		+
		+	The strings can now be referred like:
		+
		+	<syntaxhighlight lang="C">
		+	printf("%s\n", str[STR_START]);
		+	</syntaxhighlight>
		+
		+	Which is obviously much more readable.
		+
		+	Synchronization between the enum and the array is still the responsibility of the programmer, and as the list grow long, errors can and will creep in.
		+
		+	== The solution: Designated Initializer ==
		+
		+	The solution to the synchronization problem, was introduced in C99 as [[Designated Initializers]]. With those, the above piece of code can be rewritten as:
		+
		+	<syntaxhighlight lang="C">
		+	typedef enum {
		+	STR_START = 0,
		+	STR_STUFF = 1,
		+	STR_OTHER = 2,
		+	STR_DISASTER = 3,
		+	STR_END = 4
		+	} str_idx_t;
		+
		+	// Strings for debug
		+	char *str[] = {
		+	[STR_START] = "Program start",
		+	[STR_STUFF] = "Some stuff happened",
		+	[STR_OTHER] = "Some other stuff happened",
		+	[STR_DISASTER] = "Disastrous error",
		+	[STR_END] = "Program end"
		+	};
		+	</syntaxhighlight>
		+
		+	The order of the strings in the array as written is no longer relevant as they will be sorted following the enum. Also if there are "holes" (undefined strings" it will result in a NULL string in the array,
		+
		+	== Video ==
		+
		+	[[C Designated Initializer]]s were covered in a [[STM32World]] short video:
		+
		+	{{#ev:youtube\|CGblBwJowDk}}
		+
		+	== Miscellaneous links ==
		+
		+	To be added

@@ Line 12: / Line 12: @@
 == Video ==
-The first of our tutorial videos describe this in some detail:
+Remake of our first video - updated for changes.
-{{#ev:youtube|EZqwBuRpdns}}
+{{#ev:youtube|3f9ag9Jdf2o}}
 We later made a video specifically discussing the [[STM32]] Families.

@@ Line 1: / Line 1: @@
 [[Category:STM32]][[Category:Streamline]][[Category:Streamline Blade]]{{metadesc|STM32H723 Streamline MCU board documentation}}
-[[File:Sl mcu stm32h723 top right.jpg|350px|thumb|Streamline MCU STM32H723]]
+[[File:sl_mcu_stm32h723-rev_A_top_right_render.png|350px|thumb|Streamline MCU STM32H723]]
 The [[Streamline MCU STM32H723]] is a higher performant [[Streamline]] [[STM32]] [[MCU]] board build around a [[STM32H723]].
 {{clear}}
@@ Line 25: / Line 25: @@
 |-
 |'''Button'''
-|Boot0/PC15 (pulled down)
+|Boot0/PA14 (pulled down)
 |}

@@ Line 60: / Line 60: @@
 == UARTs ==
 {| class="wikitable sortable"
@@ Line 187: / Line 181: @@
 | PD8
 | PD8
+| GPIO6
 | rowspan="2" |
 |-
@@ Line 197: / Line 191: @@
 | PD9
 | PD9
+| GPIO7
 |-
 | rowspan="2" | USART3A2
@@ Line 315: / Line 309: @@
 ! STM32H723
 ! RP2354
 |-
 | rowspan="2" | CAN1
@@ Line 325: / Line 320: @@
 | PA12
 | TBD
 |-
 | bgcolor=#CC0|RX
@@ Line 442: / Line 438: @@
 == I2C ==
 {| class="wikitable"
@@ Line 545: / Line 535: @@
 == SPI ==
 {| class="wikitable sortable"

@@ Line 1: / Line 1: @@
 [[Category:C]][[Category:Work in progress]]{{metadesc|Learning C tutorial}}
 [[C]] is a general purpose programming language which was created in 1972 by Dennis Ritchie.
 == Hello World - Desktop vs. MCU ==
@@ Line 18: / Line 24: @@
 </syntaxhighlight>
-Most UNIX like systems have (or bloody should have) a C compiler, typically named ''cc'', so above ''hello.c'' can be built into a binary executable thus:
+Let us break down the classic C program line by line.
 <syntaxhighlight lang="Bash">

← Older revision		Revision as of 00:25, 20 September 2026
(4 intermediate revisions by the same user not shown)
Line 1:		Line 1:

	== Hello World - Desktop vs. MCU ==		== Hello World - Desktop vs. MCU ==
		+
		+	When learning any programming language, the first "project" will typically be a small program which prints out "Hello World!".
		+
		+	=== Standard UNIX ===
		+
		+	On a standard UNIX system, that program, implemented in standard C, would typically look something like this:
		+
		+	<syntaxhighlight lang="C" line>
		+	#include <stdio.h>
		+
		+	int main(void) {
		+	printf("Hello World!\n");
		+	return 0;
		+	}
		+	</syntaxhighlight>
		+
		+	Most UNIX like systems have (or bloody should have) a C compiler, typically named ''cc'', so above ''hello.c'' can be built into a binary executable thus:
		+
		+	<syntaxhighlight lang="Bash">
		+	$ cc hello.c -o hello
		+	</syntaxhighlight>
		+
		+	This will produce a binary ''hello'', which can now be executed:
		+
		+	<syntaxhighlight lang="Bash">
		+	$ ./hello
		+	Hello World!
		+	</syntaxhighlight>
		+
		+	=== Embedded ===

	To be added		To be added

@@ Line 672: / Line 672: @@
 | USART3A1_TX
 | USART3A1_TX
+| GPIO6: UART1_TX
 |-
 | B32
@@ Line 682: / Line 682: @@
 | USART3A1_RX
 | USART3A1_RX
+| GPIO7: UART1_RX
 |-
 | B33