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From: Mike Monett VE3BTI <spamme@not.com>
Newsgroups: sci.electronics.design
Subject: Re: Microcontroller (AVR) programming from smartphone
Date: Wed, 27 Mar 2024 05:39:16 -0000 (UTC)
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rodion_gork@mail.ru (RodionGork) wrote:

> Hi Friends!
> 
> Briefly: considering ways of uploading code to microcontroller
> (particularly some Atmel's AtMega - same as used for Arduino) from the
> smartphone. 
> 
> In details:
> 
> Programming MCUs (e.g. uploading firmware into their ROM) usually
> happens via some proprietary interface (using SPI in case of AVR), or
> UART, or JTAG. This generally involves dedicated software on the side of
> computer and some hardware (USB to UART or dedicated "serial
> programmer"). 
> 
> Suppose we want to be able to write simple code using mobile phone -
> situation I met with my class of 15+ students with no dedicated lab
> having 15+ computers. 
> 
> I tried creating a small system containing two parts: First - html
> web-page with a textarea to write assembly code, built-in AVRA assembly
> compiler (just compiled to javascript) - and some JS code which can
> "beep" the bits of the hex-file containing firmware (via audio). Second
> - bootloader for target MCU which uses ADC pin to "listen" to those
> beeps via direct wire connected to 3.5 mm audio jack plugged into
> smartphone - and "burn" incoming data into flash memory. 
> 
> This works (if you are curious to try, it could be found in my github
> page by same username) - however there is a sudden issue: almost half of
> students use mobile phones without 3.5mm jack - as nowadays it is the
> era of wireless headphones already, I missed the fact! 
> 
> So now I'm looking for further, alternative approaches. For example:
> 
> - attaching microphone to ADC pin instead of wired connector; code
> should be beeped out via built-in speaker of the smartphone (it would be
> a bit noisy class, of course) - I actually tried, but was not yet able
> to come up with signal recognition algorithm of good enough quality. 
> 
> - blinking data with display and catching it with photo-transistor
> attached to ADC or digital pin, haven't tried for it seems like bitrate
> would be very low (even though we generally need to upload firmware of
> few dozens bytes). 
> 
> Thus I'm open to any ideas / hints / articles on improving either of
> these two approaches - or perhaps something completely different which I
> may have missed. 

+1. I hope you get a good reponse. A worthy project for your students, and 
the solution could be used around the world!



-- 
MRM