Problem not in filesystem, device cant` detect card type and init it in SPI mode, card not answer as need (on CPU connect it use more difficult SDIO mode, SPI mode - legacy but allow use SD from tiny

Ok i try ignore not answer on this command.

Try this, i increase wait answer for detect card type Card answer ok, but after i ask about type, by default i should answer in 200ms, but no.. i increase time to more big value 43.118 rx: CMD0 Ok 43.

Here is SD card debug version of firmware, connect it to CPU (use any console app like Putty, also you can use NanoVNA-App console) Made any save to SC card and send me log from console. I have this a

NanoVNA use SPI mode for connect to SD (more simple to implement on current CPU), on PC use SDIO mode more fast, i can made debug version of firmware and see how SD card answer, possibly it helpfind p

Save data in 16bpp bmp format, size depend from device screen size For H, ~ 320*240*2 = 150k For H4 ~ 480x320*2 = 300k So i think SD card size not big problem, in 1G card you can save ~3500 screenshot

NanoVNA-H - not have big amount of intenal flash , and i can`t add exFAT support to it, so SD-Card limit only 32Gb (maximum for Fat32 filesystem) NanoVNA-H4 - can support exFat, so you can use any SD-

SD card can be isert and remove while device power on. Not need remove card while devicr save data on it. You can save s1p or s2p file if press menu SD CARD->SAVE S1P or S2P Also you can save screensh

#pcb #hardware

If i correct, comma or dot depend from current system locale settings

#applications #problem #fix

I think need switch to H4 git switch H4 And build after

You build master branch or H4? Master - only for H version

Work on 3 harmonic 300-900MHz (not 600) Next use 5 harmonic in range 900-1500MHz What device and firmware you use?

NanoVNA-App for Windows allow connect to NanoVNA over WiFi/Bluetooth https://groups.io/g/nanovna-users/message/17758 I test vs HC-05,HC-06 Bluetooth module on speed up to 460800 all work Also use WiFi

Settings for Freq range, trace count, scale and so on, stored to calibration slot after calibration, and load after load from it. Also you can change setting, and store to slot. Calibrate->Save>Slot N

This alalog of this calculator: https://www.leleivre.com/rf_lcmatch.html Allow compencate current impedance to 50Om

#features #nanovna-h4 #firmware

Reset calibration, if you not see noise, then problem in LOAD from calibration set, or in bad connection on CH0, check it.

#calibration #firmware #nanovna-h

I not recommend use as start point 50k and end big frequency like 900M Better set 1M to 900M If need measure on < 1M select only this range. Interpolation for low values < 1M allow measure it on this

#calibration #firmware #nanovna-h

You need flash correct firmware for 4' screen.

#firmware

Stimulus - allow set sweep frequency range my set this values manually Marker-Operations allow also set it, but from current marker data, example you have range 100M to 200M and current marker stay on

#features #nanovna-h4 #firmware

About SD card read this post https://groups.io/g/nanovna-users/message/14447

#features #nanovna-h4 #firmware