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uProg - small, fast, portable AVR programmer with SD

manekinen 159940 364

TL;DR

  • uProg is a small, portable AVR programmer with SD/MMC storage for flashing, reading, and verifying AVR flash, EEPROM, fusebits, and lockbits.
  • It uses FAT16/FAT32 cards, a 6-pin ISP connector, a 4-button menu, automatic SCK selection up to 4 MHz, and a built-in bootloader for self-update.
  • The PCB measures 44 x 39 x 5.5 mm and writes at 12.5 kB/s while reading at 14.5 kB/s.
  • It was fully tested with tiny13, tiny45, tiny2313, mega8, mega88, mega16, mega32, mega328, and mega644, but HEX files are guaranteed only up to 64 kB.
  • Battery operation is limited: startup can draw up to 100 mA, the target is not powered through VCC, and removing the card during use can corrupt files.
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  • #331 14049281
    tomastom
    Level 12  
    Posts: 35
    Help: 1
    Rate: 7
    I would have one question about measuring the currents of the power source on which leg it takes place and whether a divider is used, I mean that I want to convert the system into a battery power supply and then use a linear stabilizer, but I would like to measure the battery itself and I do not know what cells can I use in this system, and it is known that when charging in the final stage, it will still jump up and I would not want to burn the system.
    Regards
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  • #332 14050102
    piotrva
    VIP Meritorious for electroda.pl  
    Posts: 6409
    Help: 625
    Rate: 734
    The system measures the supply voltage using Bandgap voltage - read about this method.
  • #333 14064931
    tomastom
    Level 12  
    Posts: 35
    Help: 1
    Rate: 7
    Does this method compare the supply voltage to the reference voltage and does it mean that the current that supplies the entire system is measured and it is impossible to measure the cells themselves before using the linear stabilizer?
  • #334 14064965
    manekinen
    Level 29  
    Posts: 1629
    Help: 76
    Rate: 2360
    The AVR circuit measures its own voltage inside, without the use of external pins. Well, saved pin as you look ;) It is not possible for him to measure the voltage from the outside.

    A question in general: why a linear stabilizer for a battery? Browse the topic, the use of an ordinary rectifier diode in series with the battery ensures that the system receives the correct supply voltage. We will neither exceed the permitted voltage nor discharge too low the battery. There is no need to combine, unless you really want to have stable voltages on the programming signals.
  • #335 14080465
    tomastom
    Level 12  
    Posts: 35
    Help: 1
    Rate: 7
    I was more concerned not to damage the programmer while charging the permanently connected battery, I wanted to connect it to a lithium cell charger with a USB socket so that it could be charged from a computer socket without disassembling the programmer.
    If this diode protects it effectively, there is no need to worry too much about it and use a stabilizer.
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  • #336 14082539
    manekinen
    Level 29  
    Posts: 1629
    Help: 76
    Rate: 2360
    Yes, just make sure what the diode has a slope. 0.6V will be ok. So from 4.2V it will be 3.6V. The programmer stops working below 3V, i.e. below 3.6V on the battery. The average operating voltage of the battery is 3.7V. This solution works, but you won't use up all your capacity.
  • #337 15675818
    adam-k
    Level 14  
    Posts: 37
    Help: 5
    Rate: 4
    That is why "stabilizer".
    I know that this is an old topic, but maybe it will be useful to someone. Like tomastom, I wanted to power the uProg from the battery and be able to recharge it from the
    USB or power adapter. A better solution would be, for example, MCP1825 which has a Vdrop of about 210mV. On the one hand, it will protect the system against charging voltage, and on the other, it allows you to use the battery up to a voltage of 3.21V - much better.
  • #338 18077168
    turbolla
    Level 7  
    Posts: 8
    Rate: 1
    Beautiful. Simple. Practical. Story!!!
  • #339 19808748
    darekplonka19
    Level 2  
    Posts: 2
    Hello, does the programmer support 32gb micro SD cards because after inserting the card, it writes that there is no SD card and now I do not know if it is the fault of the card or maybe the software. I am asking for any help.

    Regards
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  • #340 19815537
    J_Bravo
    Level 28  
    Posts: 1373
    Help: 36
    Rate: 161
    Not. Only supports old type cards up to 2GB
  • #341 19826156
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    Hello, so I bought a 128MB card, programmed the atmega, uploaded sd files to the noi card, unfortunately it does not work after turning on, it shows me SD ERROR, which may be the reason for the lack of an sd card, fus bits set, I tried batch 1.0, 1.2
  • #342 19826274
    Dariusz Goliński
    Level 22  
    Posts: 782
    Help: 27
    Rate: 149
    And the card in what file system do you have?
  • #343 19826280
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    Card formatted in FAT-32
  • #344 19826387
    J_Bravo
    Level 28  
    Posts: 1373
    Help: 36
    Rate: 161
    The card cannot be SDHC. 128MB should theoretically work.
  • #345 19826503
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    this is an ordinary micro sd card, 128mb formatted fat32, uploaded files from the sd files directory to the card also do not know what the reason may be, 22uF / 16v capacitors or any ideas, and I will add that I am using an sd to micro sd adapter but it probably is not should be disturbing
  • #346 19836185
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    So gentlemen, some help on your part
  • #347 19837400
    Gienek
    Level 37  
    Posts: 2775
    Help: 393
    Rate: 350
    You already had the answer:
    Code: text Expand Select all Copy to clipboard
    Karta nie może być SDHC


    This micro SD card of yours certainly belongs to SDHC class 10. You need to find some "historic" Class 2 card and then the programmer will start working properly.
  • #348 19837429
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    My card looks like this .. uProg - small, fast, portable AVR programmer with SD
    uProg - small, fast, portable AVR programmer with SD
  • #349 19837466
    Gienek
    Level 37  
    Posts: 2775
    Help: 393
    Rate: 350
    Nothing is known from this description. Maybe it's a card from the "main frend" :D and with this, anything can happen.
  • #350 19837560
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    Generally, the card is functional because it can see 128mb
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  • #351 19838155
    Gienek
    Level 37  
    Posts: 2775
    Help: 393
    Rate: 350
    The card may be functional, but not compatible with this programmer. Most of the water is too fast.
  • #352 19838397
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    Ok, thank you for your help, I will look for another Microsd card. Regards
  • #353 19838604
    Dariusz Goliński
    Level 22  
    Posts: 782
    Help: 27
    Rate: 149
    It may be otherwise. And has this programmer ever worked for you?
  • #354 19838611
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    after making the plate, assembling it, it started right away, but only the fault is on the card side, as I already did my own PCB in the form of a through-hole because I thought there was an error somewhere shallow smd, but it turned out the same no card
  • #355 19841040
    Dariusz Goliński
    Level 22  
    Posts: 782
    Help: 27
    Rate: 149
    Has it moved in the sense that it has turned on or has it moved because you have read the card at least once?
    How did you program Prock?
  • #356 19841138
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    So, the processor programmed in an external programmer, and more precisely through the ISP connector in the arduino uno, with the mkvcalculator fuse program, the bits are set, after switching on the LED will flash 3 times and the display will display the inscription no card for a moment, then it goes to the menu and shows the voltage level 3.3v, he did not read the card even once, despite the uploaded hex files to the flash directory, the entire description is probably powered from the power supply with regulated regulated voltage
  • #357 19842679
    Dariusz Goliński
    Level 22  
    Posts: 782
    Help: 27
    Rate: 149
    1. Was this programmer set to 5V or 3.3V?
    2. You upload files to the card, but on top do you have the required folder structure?
  • #358 19842729
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    I tried and at 3.3V and 5V, the directory structures are loaded on the card
  • #359 19843099
    Dariusz Goliński
    Level 22  
    Posts: 782
    Help: 27
    Rate: 149
    Well, I have 2 more suggestions.
    When I used the 5V programmer, I released the slingshot every time. And then he did not read.
    As I switched to 3.3 it was OK but with a new prock.
    I can also rip your card bit by bit so that you can recreate it at home.

    PS
    I was just thinking. If you do not read your card, how did you set the brightness of the display? After all, he needs a config from the card.
    And do you have an animation after turning it on and off?
  • #360 19843120
    darex120
    Level 18  
    Posts: 1099
    Help: 1
    Rate: 61
    After programming the processor, setting the bits, turning on the lack of SD and going to the menu for animation, there is no processor, for sure, because I have several of them
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Topic summary

✨ The discussion revolves around the uProg, a compact and portable AVR programmer that utilizes SD cards for firmware storage. Users express admiration for its design and functionality, highlighting its small size (44 x 39 x 5.5 mm) and fast programming speeds (write: 12.5kB/s, read: 14.5kB/s). Several users inquire about compatibility with various components, such as different LCD displays (notably the Nokia 3310's LPH7779), and the ability to program various AVR microcontrollers, including the ATmega328P and ATtiny series. Issues with SD card compatibility, particularly with SDHC cards, are frequently mentioned, as well as problems related to fusebit settings and display contrast. Suggestions for improvements include adding a battery charging system, enhancing the user interface, and providing better documentation for setup and troubleshooting. The community shares experiences with different configurations, troubleshooting tips, and modifications to enhance the programmer's capabilities.
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FAQ

TL;DR: uProg writes AVR flash at 12.5 kB/s and reads at 14.5 kB/s; “The best results can be obtained with BIN files” [Elektroda, manekinen, post #9597772] Why it matters: those rates cut on-site firmware updates to under six seconds for a 64 kB image.

Quick Facts

• Foot-print: 44 × 39 × 5.5 mm, 5 mA menu current [Elektroda, manekinen, post #9597772] • Peak write: 12.5 kB/s; verify read-back 14.5 kB/s [Elektroda, manekinen, post #9597772] • Supported cards: 128 MB – 2 GB SD/MMC, FAT16/32 (SDHC in roadmap) [Elektroda, manekinen, post #9597772] • Stand-by draw: 0.10 µA; boot surge ≤ 100 mA (card-dependent) [Elektroda, manekinen, post #9597772] • Tested MCUs: ATtiny13 → ATmega2561; auto SCK 4 MHz-62.5 kHz [Elektroda, manekinen, post #9597772]

How do I enter fusebits without a PC?

Choose Fusebits → Manual. UP/DN scroll each hex digit, RI confirms, LE cancels. Default factory bytes are pre-loaded for safety [Elektroda, manekinen, post #9693727]

Why does verification fail after long cables?

Auto-speed starts at 4 MHz SCK and steps down on first error. A 30 cm ribbon may still pass the signature test but corrupt data. Limit length to ≤ 20 cm or set Max SCK=3 in config.ini (250 kHz) [Elektroda, manekinen, post #9597772]

‘File too big’ when flashing ATtiny25—work-around?

Bug in size parser affects HEX < 2 kB. Convert to BIN or pad file, then flash successfully [Elektroda, manekinen, post #10377528] A fix is scheduled in the next release.

How can I speed up the programmer itself?

Set OSCBoost bit0=1 and OSCCAL to F0-FF. At 16 MHz average write rate rises 28 % but some MCUs require SCK capped to 2 MHz [Elektroda, mlassota, post #10118939]

What’s the typical failure after reverse-biasing C5?

Tantalum C5 stripe denotes +. Reversed part shorts the SD rail, overheats, and can burn the PCB within 3 s [Elektroda, krzycho123, post #9826229]

Is Li-ion charging supported on-board?

PCB 1.2 exposes SO8 and SOT-223 pads so you can add MCP73831 charger and LDO. Factory firmware doesn’t monitor charge; add external LED or ADC mod as in user build [Elektroda, MatygaD, post #9773466] A native charger is on the roadmap.

Quick How-To: update uProg firmware from SD

  1. Copy new BIN as 000.bin to card root. 2. Insert card and power-on; blank screen confirms bootloader mode. 3. Press RI to flash; after reboot the splash shows the new version [Elektroda, manekinen, post #9597772]

Edge-case: what if the LCD shows only a dash?

A single dash means uProg shut down. If it appears at power-up, SD Vcc is below 2.7 V; recharge battery or replace C4 [Elektroda, marcin44430, post #10116045]
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