is it possible to upload several sketches to an Arduino board - arduino

I have a project that is divided into two sections
each one of them requires an independent sketch,
I wanna upload the two sketches into the same Arduino card without one of them ruining the other's work, is that possible? if yes how to please
if no any other alternatives


No.
But you could combine both rather independent parts and add some logic to find out which part should be active, currently.
E.g. When a button (-combination) is pressed at restart, Arduino runs the test mode, else it runs in standard mode.
You can have multiple tabs in the Arduino IDE to handle the modes more independently, but all code is coexisting in flash memory after upload.


What you can do is have two seperate bin files (IDE menu Sketch / Export compiled binary) and have both of them include OTA code so you can update the binary as needed. The bin files can be stored locally on an SD card or remotely on a web server if the board has networking capabilities. Once updated the processor will reboot and start with updated code.
Look at ArduinoOTA for more information.

Related

Is Arduino able to update only part of firmware?

I'm building a new project, and need to choose an MCU board.
What I'm trying is firmware's partial update. I will appoint part of firmware(like functions) on specific flash sector, and update only the sector so I don't need to erase&write the whole flash.
On my previous project, STM32F4DISCOVERY worked really fine but I wonder is Arduino could be an option.
Is it possible to set an memory address for firmware(i.e. funcA->0x0030, funcB->0x0090)
Is there a way to jump flash cursor(execute the code on specific memory address)
Can Arduino dynamically erase/write on flash memory itself?

Boards.txt file holds a reference to the Linker Script where memory regions are configured including starting address and length of flash and RAM.
FlashAsEEPROM is a library used to write/read the flash memory where EEPROM is not available.

nodemcu/ESP8266 using Arduino IDE - Firmware?

I guess I'm having a basic understanding issue regarding the nodemcu/ESP8266 when it is used with the Arduino IDE and/or visual micro (for MS Visual Studio).
Everytime I upload a program/sketch which is obviously written in C in this case, it is compiling and uploading a binary of about 280kb, even if it is only a simple "blink" example.
Is it some kind of firmware being uploaded everytime or is it just monsterious libraries needed for the ESP to work with the Arduino IDE?
If it is firmware, do you normally "update" the firmware to a more recent build when working with the Arduino IDE? When using the nodemcu LUA firmware, there are periodic updates.
Thanks!

Basically, you build the firmware, which is a combination of your own code, and lots of other code/libraries.
All the other parts are part of the Arduino ESP8266 core, which does indeed get updates (it lives here: https://github.com/esp8266/Arduino). And it itself contains the Espressif SDK, which also gets updates (https://github.com/esp8266/Arduino/tree/master/tools/sdk).
Like NodeMCU you can get periodic updates, but they are of the core, and the only way to get them into your firmware is to recompile your sketch.

This is completely normal - When writing code for an interpreted language like Lua for the ESP/NodeMCU, you're just uploading what is a relatively small text file(s), as the code needed to run it is already on the chip, and doesn't change.
However, when you start working with compiled languages like C (With the Espressif SDK only, for example), or C++ with the Arduino IDE, you are replacing the entire firmware each time your code changes. This includes the TCP/IP stack, WiFi management, the logic controlling the PHY/MAC interface, the mini OS, and a host of other bits to make your ESP8266 work. Even if your code appears to be just a simple "blink" sequence, there's a lot of code running behind the scenes to make it possible, leading to the large sketch size.
Generally, every change to your sketch code will produce a complete copy of everything needed to create a bootable, runnable binary for the ESP8266. This is what is causing the 280KiB file. Since each copy of your code includes the newest (Or at least whatever is in your IDE at the time) copy of the system level code, there is no separate update process - Each time you upload your sketch, the system code is updated too.
Additionally, there is some extra overhead from the Arduino abstraction on the Espressif SDK, leading to a larger resulting binary size.

I have pic16f877a pic dev board i want to know how to set the mplab to compile a program that can be fused on my pic microcontroller

I have a dev board but unfortunately i could not program my pic ic because that the compiler compiles the program succesfully but I am unable test on the dev board rather than the software simulation

If you have to flash your PIC16F877A device rather that just simulate it on PC, you should run:
MPLAB IPE
then select family and device:
finally select you tool depending on what you have on your table,
as per list of all it can be:
and then press the Program button.
You may need to setup a minor number of additional options what suit your particular purposes.
For any reading and more understanding follow this document

CC2540 DK Program SimpleBLE Peripheral Application

I have purchased the CC2540 EK I am trying to program the SampleBLE peripeheral onto the CC2540EM. I am using the IAR tool chain and the USB cable is connected directly to the SMARTRF05EB (not using the CC debugger) In IAR I can download the code but the SimpleBLEperipheral does not seem to run.
Looks like the App that came with the CC250EM from the factory has been erased and I am unable to reload that application again.
What is the exact project workspace that I shoud open?
Are there any changes that need to be made to the IAR project so that it can be run on the CC2540EM?
The IAR project name is SimpleBLEPeripheral - CC2540DK- MiniKeyfob - this seems to suggest that it is meant for the keyfob and not the CC2540EM.

It's due to the build option.
You got to set the build option to "cc2540", instead of "cc2540df-mini keyfob"...
In IAR, you can set the build option in the drop-down menu in the Workspace area. (it's right under the word "Workspace")
After doing this, compile and reload the hex file to the module.
It should be able to solve the problem.

Android USB Accessory JAR copy to system folders, does it need the odex file too?

I am trying to get my phone to accept USB Accessory mode and run the DemoKit connected to the Arduino ADK. My ROM did not contain the appropriate files so, I decided to do it myself.
First the specs
My phone: Samsung GT-I9100
My ROM: 2.6.35.7-I9000XWJVZ (rooted)
Firmware: 2.3.6
I've succeeded before in copying the .jar .odex and .xml file to the appropriate folders. Although it completely bricked my phone and was stuck in a boot loop. Now, recovered, I want to give it a second try.
What is this .odex file that every other .jar file has in the /system/framework folder?
Do I need to build/copy the .odex file myself (read something that Dalvik does JIT compiling)?
Is it possible that in my previous attempt, the copying of the .odex (that I got from another phone I9100), bricked mine?
I know I was careless in my previous attempt. Now, I want to approach the subject with a bit more knowledge...

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