Recent Posts

91

ESP32 / Ethernet communications in ESP32-EVB

« Last post by diego on August 23, 2018, 05:32:59 PM »

Hello everyone.

Please forgive me if this question is too stupid, but I have limited experience on this subject. I am trying to communicate with an ESP32-EVB Rev D board over ethernet. I can successfully run the ETH_PHY_demo sample from https://github.com/OLIMEX/ESP32-EVB/tree/master/SOFTWARE/ETH_PHY_demo. I am receiving an IP address from the DHCP server and I can successfully ping the board from other devices in the network.

Now I would like to exchange some UDP datagrams with other devices, but I do not know how to proceed. Is there a socket library, or something of the kind?

Thank you.

92

A20 / Re: kernel source of Debian Jessie with kernel 3.4.103 + release 13

« Last post by zeallin on August 23, 2018, 04:51:16 AM »

Hello John,

Do you mean searching with Google?
I've been spent a week finding the solution for this and have no luck.
I suppose expert here who have experience on compiling kernel module can give me some advice.
Thanks!

Best regards,
Zeal

93

TERES DIY Laptop / Re: Coil whine

« Last post by khumarahn on August 22, 2018, 10:37:39 PM »

I tried to find a replacement coil and could not. Where do you source them from? Do you know of anything suitable that would fit the pcb?

Why is there still noise despite the four 47uf capacitors?

I got used to a light laptop with good battery life, which is supposedly repair friendly. It would suck if this problem is not fixable.

94

A20 / Re: kernel source of Debian Jessie with kernel 3.4.103 + release 13

« Last post by JohnS on August 22, 2018, 03:37:21 PM »

Maybe the posts about this on the net provide the answer?

John

95

A20 / kernel source of Debian Jessie with kernel 3.4.103 + release 13

« Last post by zeallin on August 22, 2018, 02:40:34 PM »

Hello Guys,

I am trying to compile kernel module for A20 which runs Debian Jessie  image release 13 (torrent) from official web page.
The module I want to compile: https://github.com/Goshik92/XR21B1411-RS-485-driver

I checked out the source and compiled the kernel followed the instruction provided in Github :
https://github.com/OLIMEX/OLINUXINO/blob/master/SOFTWARE/A20/A20-build-3.4.103-release-8/BUILD_DESCRIPTION_A20_Olimex_kernel_3.4.103%2B_Jessie_rel_8.txt

Then link the kernel source to build kernel module ( replace the softlink "build" from /home/gogo/a20-olimex/linux-sunxi to downloaded source code)

The module can be compiled successfully, but the compiled kernel module can not be installed though insmod.
It failed with "invalid module format"

Where can I find the correct version of kernel header / source to compile kernel module?

Thank you very much!!

96

TERES DIY Laptop / Re: Coil whine

« Last post by khumarahn on August 21, 2018, 02:11:31 PM »

I fixed the coil with the superglue, and the noise got much quieter, but it is still audible. I am looking for a solution.

Maybe I could replace the coil with another one (if I manage to un-glue it from the board)?

upd: despite the superglue, the whine is back. It has to be fixed before I can use the laptop comfortably.

97

TERES DIY Laptop / Re: Coil whine

« Last post by khumarahn on August 21, 2018, 12:21:10 PM »

A picture:

98

TERES DIY Laptop / Re: Coil whine

« Last post by khumarahn on August 21, 2018, 02:43:14 AM »

In an attempt to get rid of the noise, I have replaced both C204 and C206 capacitors. The replacement is TDK 47uf https://uk.rs-online.com/web/p/ceramic-multilayer-capacitors/7883060/

This had almost no effect on the noise. Maybe it got a little less loud, but I am not sure. Then I added two more 47uf capacitors, one on top of each. The sound got a bit quieter, but again not significantly.

The whine does not appear with my previous screen, but I have broken it recently.

99

A64 / Re: A64 Wiki page missing

« Last post by JC on August 14, 2018, 08:45:02 PM »

Oh, I understand they are on holiday. No rush. I also have no trouble finding the latest Ubuntu image for the board. I actually seed all Olimex torrents 24/7 on my server. However, it's just not good marketing to have a blank wiki for a product or links to supplemental references to support customers. For example, alternative images are critical for many people. If any working alternative images are available, it would be in the product's best interest to have them placed there - even if they're dated. On another note, I'm working on Armbian support for this board and will let you guys know once I have a nice stable build.

100

A20 / Re: AXP209 shutting down

« Last post by lase on August 11, 2018, 08:12:25 PM »

Hi, I had the same problem.

The reason was that I didn't use LDO2, LDO3, LDO4 so I didn't connect anything to LDO24IN and LDO3IN (these are all three enabled by default). After connecting these to IPSOUT it started working for me. I think AXP209 monitors the output of those LDOs and shuts down when it notices its voltage is not as configured.

Hope this helps someone!