035 - STM32F1 USART Build C functions: String search, concatenate, integer 2 string, string to int

Welcome to the WeeW - Stack

Welcome to this new video for the STM32F1 microcontroller, where the code is from scratch.

This video has the following topic of Building c funtions to:

1- get the length of a string

2- find a string inside a string

3- finding an exact string match

4- Concatenate 2 strings

5- Convert integer to string

6- Conver string to unsigned interger

[maazizpeaceinstituteoftech]

Best tutorial ever made on this topic "STM32F1 and Keil c". waiting for your next tutorials.

[hhunter]

Hi Weew, excellent tutorial!
I revised find_str function below :)

// Find a string on a string
// str1 is the string to find in str2
unsigned int find_str(char str1[], char str2[])
{

unsigned int position = 0; // Array pointer for the two strings
unsigned int offset = 0; // Offset index for str2
unsigned int char_match = 0; // Character match counter

unsigned int str1_len =

// While there are exact number of str1 characters to compare starting from the offset position of str2
while(str2[offset + (str1_len-1)] != '\0')
{
// Compare characters of str1 in str2
for(position=0; position<str1_len; position++)
{
if(str1[position] == str2[offset+position])
{

== str1_len-1)

String match found
1;

}else
{

}
}
char_match = 0;
// Increment offset
offset++;
}
// No string match
return 0;
}

[marxl]

Why "str2[i + STRlen-1] != '\0' " condition is needed in the find_str function?

[НикитаЛеонтьев-дж]

Strange, but in my case find_str func working only without STRlen+1. Thoughting about errors i copied yr function's code from github, nevertheless, code's working without +1 :)