Solved!
My Omega was controlling some outputs with the help of some transistors. The resistors between Omega and the base of transistors were all 1kohm, which might have been too low for Omega capabilities of 4 mA per GPIO. I replaced all of them with 4k7 and it is now working.
I don't even know why I have used such low resitances. I guess I was thinking that if I am not low on power, then why not.
@György-Farkas I have updated the schematic with the resistors values I was using when the SD card was not visible.
@György-Farkas
Sure! I have uploaded a PDF schematic on github under the PCB White Rabbit folder.
Solved!
My Omega was controlling some outputs with the help of some transistors. The resistors between Omega and the base of transistors were all 1kohm, which might have been too low for Omega capabilities of 4 mA per GPIO. I replaced all of them with 4k7 and it is now working.
I don't even know why I have used such low resitances. I guess I was thinking that if I am not low on power, then why not.
Update!
I have disconnected the Omega from the board that I have designed and powered it up separately and now the SD card is discoverable. Thus, something from my PCB is definitely interfering with the SD card. Does anyone have a clue what could be the cause of it?
@crispyoz Omega2+
I have designed my own PCB that I connect Omega2+ to. You can check that out here: https://github.com/cristi-bourceanu/Omega2P_FruitingChamber.git
Normally a MCU can withstand a maximum of 20mA on each GPIO and MT7688 chipset of Omega should have a similar specification. The motor you specified seems to have a 13.6 ohm phase resistance, thus you'll definitely need a bridge to control it.
This topic explains how to power up the Omega without a dock: https://docs.onion.io/omega2-docs/hardware-prep-no-dock.html
This project seems doable with Omega2, but my opinion should not be regarded as 100% true since I am working on my first project with Omega2 at the moment.
@crispyoz I will follow your advise about cross compiling. Remote debugging sounds very satisfying and can't wait to learn about it.
The SD card did not automount and that was my problem in the first place. I have even factory reset it, but nothing changed. I kind of use all the peripherals(GPIOs) available on the omega, but that shouldn't interfere with the SD unless there are some common connections, but I couldn't confirm that since I didn't find any schematic for Omega2+.
@crispyoz I didn't know about cross compile. I had just started using Omega, so I am still learning about it.
Thx for your suggestion!
However, I would still like to make the micro SD card useable for future needs.
Hi,
I have just started working with Omega2+ and the first thing I want to do is to boot from SD card, because I want to use the gcc and g++ compilers and Omega does not have enough memory. However the SD card is not visible at all.
root@Omega-B536:/tmp# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 7936 7936 0 100% /rom
tmpfs 62404 240 62164 0% /tmp
/dev/mtdblock6 22592 8428 14164 37% /overlay
overlayfs:/overlay 22592 8428 14164 37% /
tmpfs 512 0 512 0% /dev
/dev/mtdblock7 512 196 316 38% /mnt/mtdblock7
I read this:
https://community.onion.io/topic/2154/sd-card-needs-to-be-re-plugged-on-reboot
but in my case the SD card cannot be seen either after reboot or after I remove and plug the card back in.
/mnt looks like this:
root@Omega-B536:/mnt# ls
mtdblock7
/dev looks like this:
root@Omega-B536:/dev# ls autofs mtd0ro mtdblock1 snd tty20 tty35 tty5 tty7 bus mtd1 mtdblock2 spidev0.1 tty21 tty36 tty50 tty8 console mtd1ro mtdblock3 tty tty22 tty37 tty51 tty9 cpu_dma_latency mtd2 mtdblock4 tty0 tty23 tty38 tty52 ttyS0 full mtd2ro mtdblock5 tty1 tty24 tty39 tty53 ttyS1 gpiochip0 mtd3 mtdblock6 tty10 tty25 tty4 tty54 ttyS2 gpiochip1 mtd3ro mtdblock7 tty11 tty26 tty40 tty55 uinput gpiochip2 mtd4 network_latency tty12 tty27 tty41 tty56 urandom i2c-0 mtd4ro network_throughput tty13 tty28 tty42 tty57 vcs kmem mtd5 null tty14 tty29 tty43 tty58 vcs1 kmsg mtd5ro port tty15 tty3 tty44 tty59 vcsa ledchain2 mtd6 ppp tty16 tty30 tty45 tty6 vcsa1 log mtd6ro ptmx tty17 tty31 tty46 tty60 watchdog mem mtd7 pts tty18 tty32 tty47 tty61 watchdog0 memory_bandwidth mtd7ro random tty19 tty33 tty48 tty62 zero mtd0 mtdblock0 shm tty2 tty34 tty49 tty63
But there is no trace of a 'mmc*' /SD.
I have tried two different SD cards hoping that the problem is the card itself, but nothing changed.
My firmware version is b233.
Could someone please help me with this?