FNIRSI-1013D "100MHz" tablet oscilloscope

[alesfilip]

Original 8GB card is "Write speed 22-35M/S, read speed up to 80M/S(SD3.0)". that's not a lot of speed. 

[alesfilip]

SUPER. Working. Good job 

[pcprogrammer]

Original 8GB card is "Write speed 22-35M/S, read speed up to 80M/S(SD3.0)". that's not a lot of speed. 

It probably is a class 10 card. Lately I have been working on the 1014D and have problems with a 4GB class 6 card, of which I suspect it fails on the speed grade, but might well be something else. Have not looked into that yet.

SUPER. Working. Good job 

Have fun with your "new" scope.

[Felipe Lacerda]

Hi, finally had time to test this amazing project!

i make backup sd card(with dd), and write with this image:

https://github.com/pecostm32/FNIRSI-1013D-1014D-Hack/blob/main/Test%20code/fnirsi_1013d_firmware_backup/Binaries/fnirsi_1013d_fwb.bin

Attached the scope image at the time of the backup, and the generated files.
[UPDATE]

flash with: fnirsi_1013d.bin v0.024v
https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/?action=dlattach;attach=2131553

and calibration... (attached)

First impression: CLEAN Sine 100K 1V (attached) 
I didn't save images with the stock firmware, but it certainly looks much better!
Even though the VRMS measurement is wrong! 

See 10Mhz(10X)... bad, in the stock fw it appeared to be better, was that because it draw a false wave? 

regards.

[Atlan]

better picture connection step up converter. Marked points: +5V (out step up), GND, 4.2V lipol (in step up)
https://github.com/Atlan4/Fnirsi1013D/blob/main/Guide%20to%20firmware/pictures/Stabilizator.jpg

[Atlan]

PC programer:
Is it possible to modify the bootloader so that it contains a menu for choosing to start: 1. the original firmware from the flash and 2. the firmware from the sdcard?

[pcprogrammer]

PC programer:
Is it possible to modify the bootloader so that it contains a menu for choosing to start: 1. the original firmware from the flash and 2. the firmware from the sdcard?

Yes it is. In this repository I added some display functionality to the bootloader to show some progress and debug information.

You can use that as a basis to make yours. Add the touch panel code, and you can skip the PECO's scope message if you like and jump straight in to the selected code.

For the FLASH you need to add the code for reading it, and with that you can skip the FNIRSI startup image too. Get the spi_control from here.

The original code in FLASH needs to be read from 27000. Uses the same BROM header with the length to be loaded into memory.

[Atlan]

Ok, thank you very much, I'll look into it.

[Atlan]

v0.025a add menu for change dc shift value. BETA version.

Turn on both channels of DC mod and measurement, bring a suitable signal to both inputs. (eg rectangle 1V peak to peak), press auto button. The option "dc shift calibration" is activated in the diagnostic menu. In the oscilloscope mode, the CTRL key is pressed. The menu to the right allows you to change the value of dc_shift_center, place the signal in the center. Press the next page button. The menu on the right allows you to change the value of dc_shift_size, set the size of the signal so that it graphically corresponds to the size of the signal. The menu on the right allows you to change the value of dc_shift_value, set the measured value in "measurements" to correspond to the size of the supplied signal. Press the end cal button. The values ​​are saved and the oscilloscope goes into normal mode.

[Magua]

Hi! What is the reason for this work of the first channel?
https://youtu.be/_PVMLz9zXbE?si=wmpkSPi7gmd0XITn

On the original firmware
https://youtu.be/jvr-6O1iL-s?si=EZfa_8cyh0BcG5Wj

[Atlan]

You have the averaging mode on.  (probably there is an error somewhere because it should also work on ch2) the values ​​for the DC shift are incorrect, 112,220,385 are probably basic.
I'll fix it later

[engineer.r152]

Good afternoon! Atlant, maybe I'm wrong, but the setup doesn't work. I go to the service menu, press DJ shift calibration, return to the work field, give a signal to both channels 1 volt, 1 kHz, rectangle and press the auto button. After that, I press CTRL and the V+, V- buttons on both channels do not change anything on all 3 pages. Where did I go wrong?

[Atlan]

The mistake is that there are limits, and you have uploaded small values.  But the plus buttons should work.  I have to add a list of values ​​there so that it can be seen what is changing.  Later.

[daemon17]

Hello! Why do I have incorrect values ​​when measuring voltage after calibration? What am I doing wrong?

[tunk]

Hello! Why do I have incorrect values ​​when measuring voltage after calibration? What am I doing wrong?

Official Fnirsi firmware or pcprogrammer's alternative firmware?
1013D voltage accuracy ±2%: 5V/div, 8 divs -> ±0.8V
DT838 DC accuracy ±(0.5% + 5dgt): 20V range -> ±0.15V

[pcprogrammer]

Hello! Why do I have incorrect values ​​when measuring voltage after calibration? What am I doing wrong?

Official Fnirsi firmware or pcprogrammer's alternative firmware?
1013D voltage accuracy ±2%: 5V/div, 8 divs -> ±0.8V
DT838 DC accuracy ±(0.5% + 5dgt): 20V range -> ±0.15V

You forgot about Atlan's mods. The screen shot shows version V0.024u.

The calibration values seem a bit low, which might explain the low reading.

[daemon17]

Absolutely right - version v0.024u. On version v0.024v the same result.
The readings are underestimated by 0.4-0.5 V.

The calibration values seem a bit low, which might explain the low reading.

How can I increase the calibration values?

[pcprogrammer]

By performing the calibration in the way Atlan described it. Search back through this thread to find the post about it.

[Atlan]

Hi! What is the reason for this work of the first channel?
https://youtu.be/_PVMLz9zXbE?si=wmpkSPi7gmd0XITn

On the original firmware
https://youtu.be/jvr-6O1iL-s?si=EZfa_8cyh0BcG5Wj

Average mode, functional on both channels. It's stupid, but someone wanted it. Turn it off in the ACQ menu if you don't need it for your luck. v0.025b

So that the overall calibration does not have to be done, I made a trick there. Which allows you to upload default values ​​for dc shift.
I don't know what it actually does if firmware with DC shift mode is used and a full calibration is performed.

If it will be badly calibrated, I don't have time to try it at the moment.

The solution is to use firmware without dc shift, do calibration and switch to firmware 0.025b, and use the RESTORE button

[daemon17]

By performing the calibration in the way Atlan described it.

I did the calibration several times as stated here




The measurement error is 0.4...0.5 V.
What else could be the problem?

[Atlan]

The problem is only in DC mode, if dc shift is used.  The latest version doesn't work somehow, probably some problem with the compiler.

[Atlan]

A PC programmer, he wrote a bootloader for the 1014d that allows you to choose which software to run.  Original, alternative or Fel boot.  When I have more time, I will adapt it to 1013d, and remove the sc shift to make the measurement more accurate in DC mode at the expense of sensitivity.

[Evi]

I'm afraid, this progress never ends.
Is there something stable???

[Atlan]

You have a choice.  You can use perfect firmware from fnirsi. 

[Atlan]

Many thanks to PECO, and small thanks to Atlan.

New bootloader for 1013D, allows selection of alternative PECO or Original FNIRSI firmware launch and FEL.

I thank PECO for the advice and help.

you can also find all the files here: https://github.com/Atlan4/Fnirsi1013D