Re: Microcontroller (AVR) programming from smartphone

On 27/03/2024 05:10, 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:

How about canibalising a cheap bluetooth earbud or pairing the phone by Bluetooth for audio with some other cheap and nasty peripheral. Plenty of not quite supported any more "smart" speakers knocking around.
--
Martin Brown