Pavly Gerges (pavl_g) pavly-gerges

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Electrostat Lab.

A Mad Scientist, Self-taught Open Source Embedded Software Engineer, and a future critical care physician. The brains behind the Electrostatic-Sandbox SDK.

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pavly-gerges / fastboot_help.md

Created January 25, 2023 21:42 — forked from MrHallows/fastboot_help.md

fastboot commands

Command:

$ fastboot help

Output:

usage: fastboot [OPTION...] COMMAND...

flashing:

pavly-gerges / realloc_example.c

Last active January 26, 2023 21:37

An example showing GNU `realloc`

	#include <stdio.h>
	#include <stdlib.h>
	#include <inttypes.h>

	int main() {

	// allocating memory for 6 integers (total = 6 * 4 = 24 bytes)
	int* ptr = malloc(6 * sizeof(int));

	for (int i = 0; i < 6; i++) { /* 6 * 4 = 24 bytes = 24 * 8 = 192 bits */

pavly-gerges / passing_params.c

Created January 26, 2023 22:09

Pass by reference V.S. Pass by address

	#include <stdio.h>
	#include <stdlib.h>
	#include <inttypes.h>

	static inline void printAddress(void** ptr_address) {
	printf("%p\n", *ptr_address);
	}

	static inline void destroy(void** ptr_address) {
	free(*ptr_address);

pavly-gerges / jni-headers-example.c

Created January 27, 2023 22:40

An example for how java native interface defines its headers and the implementation of java native apis

	#include <stdio.h>
	#include <stdlib.h>

	/**
	* Headers
	*/
	struct JNINativeInterface_ {
	void *reserved0;
	void *reserved1;
	void *reserved2;

pavly-gerges / techdemo.c

Created January 30, 2023 18:45

Constant pointer to constant data example

	#include <stdio.h>
	int main(void) {
	int x = 8; // define x
	int y; // define y
	// constant pointer to constant data
	const int* const ptr = &x;
	printf("%d\n", x);
	}

pavly-gerges / techdemo.c

Created January 30, 2023 18:49

Constant pointer to non-constant data

	#include <stdio.h>
	int main(void) {
	int x = 8; // define x
	int y; // define y
	// constant location (pointer) to non-constant data
	int* const ptr = &x;
	// an attempt to modifiy the data will succeed
	*ptr = 55;
	printf("%d\n", x);
	// an attempt to modify the memory location will fail

pavly-gerges / number_utils_max.c

Created February 13, 2023 15:52

Finds the maximum number among some numbers

	#include <stdio.h>

	/**
	* Finds the maximum number between 2 numbers.
	*
	* @param n0 the first operand
	* @param n1 the second operand
	* @return the maximum number, any of the 2 numbers if the numbers are equal
	*/
	static inline int max0(int n0, int n1) {

pavly-gerges / private_definition_techdemo.c

Created February 14, 2023 22:33

An example shows a function definition inside another function demonstrating local scopes effect on function definition

	#include <stdio.h>

	static inline void call_stack() {
	void inside_block() {
	printf("inside block");
	}
	inside_block();
	}

	int main() {

pavly-gerges / jni_headers_example_2.c

Last active February 15, 2023 20:52

An example showing how to assign a function table to a C struct in one go


	#include <stdio.h>
	#include <stdlib.h>

	/ jni.h ********************************************************************************/
	struct JNINativeInterface_ {
	void *reserved0;
	void *reserved1;
	void *reserved2;
	void *reserved3;

pavly-gerges / chunk_cpy.c

Created February 18, 2023 18:15

Tests chunk memory copy in C

	/**
	* Test chunk memcpy
	*
	* @author pavl_g
	*/
	#include <stdio.h>
	#include <string.h>

	static inline void printAddresses(char* arr, int length) {
	for (int i = 0; i < length; i++) {

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