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by Killertechno
Thu Apr 05, 2018 4:45 pm
Forum: Compute Module
Topic: Compute Module I/O board Mechanical Data
Replies: 1
Views: 447

Compute Module I/O board Mechanical Data

Why still not making available board (I/O board) drawings?????
by Killertechno
Wed Apr 04, 2018 2:15 pm
Forum: Device Tree
Topic: DT Overlay to force some GPIOs into HiZ from boot
Replies: 25
Views: 5483

Re: DT Overlay to force some GPIOs into HiZ from boot

Ok, first of all thanks for answer(s), I'm starting to study... if you are running firmware dated 22nd March 2018 or later. ??? Latest image I can find is: Raspbian Stretch Lite Minimal image based on Debian Stretch Version: March 2018 Release date: 2018-03-13 Kernel version: 4.9 or new firmware ava...
by Killertechno
Wed Apr 04, 2018 8:49 am
Forum: Device Tree
Topic: DT Overlay to force some GPIOs into HiZ from boot
Replies: 25
Views: 5483

Re: DT Overlay to force some GPIOs into HiZ from boot

Another question: file dt-blob.dts [email protected] { function = "output"; termination = "pull_up"; polarity="active_low"; }; // activity LED ... [email protected]_DISK_ACTIVITY { type = "internal"; number = <16>; }; ... In this case I suppose I'm setting LED on Raspberry Pi: I set GPIO16 as output, active low...
by Killertechno
Wed Apr 04, 2018 8:30 am
Forum: Device Tree
Topic: DT Overlay to force some GPIOs into HiZ from boot
Replies: 25
Views: 5483

Re: DT Overlay to force some GPIOs into HiZ from boot

Oh my God!!! Sorry guys, I'm becaming crazy........ I'm not aware about device-trees, then I come here and I find Raspberry device-tree different to ones I was used to. Ok, please tell me if I'm correct or wrong: - there is default (hardware) configuration provided in image I download from raspberry...
by Killertechno
Tue Apr 03, 2018 3:38 pm
Forum: Troubleshooting
Topic: bcm2835_init: Unable to open /dev/gpiomem: Permission denied
Replies: 4
Views: 2931

Re: bcm2835_init: Unable to open /dev/gpiomem: Permission denied

So what exactly?
I'm having same trouble, what did you do exactly?
by Killertechno
Fri Mar 16, 2018 2:07 pm
Forum: General discussion
Topic: Why not a low power Raspberry?
Replies: 43
Views: 4727

Re: Why not a low power Raspberry?

The SoC isn't really suitable for very low power applications. Sorry, probably little misundestand: as SoC (or would be better SoM?) I mean something similar to CM. Pi-s and Zero already have connectors (ethernet, USB, HDMI...), I mean just connectors such as CM or GPIO on Pi-s and Zero to be mount...
by Killertechno
Fri Mar 16, 2018 11:51 am
Forum: General discussion
Topic: Why not a low power Raspberry?
Replies: 43
Views: 4727

Why not a low power Raspberry?

Since Raspberry has been created I see newer models with increased performances (more RAM, higher frequency, more cores, etc. etc.). That's for SBC. For industrial use I can only find CM (1 or 3 version). Ok, in this way I have several devices I can use for "general" purposes but... what about batte...
by Killertechno
Thu Mar 15, 2018 1:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: [USB] USB hub in daisy chain, disadvantages?
Replies: 0
Views: 214

[USB] USB hub in daisy chain, disadvantages?

Hi to all, I try to open a new discussion due it's slightly different from previous daisy chain topics.... I need to create a device using Pi (conventional or CM) with standard design expansion boxes. I need all expansion boxes with same case and standard connectors, obviously with different functio...
by Killertechno
Wed Feb 21, 2018 6:34 pm
Forum: General discussion
Topic: Pi Zero W - No WiFi interfaces found
Replies: 21
Views: 25235

Re: Pi Zero W - No WiFi interfaces found

Hi to all, I've been using Raspberry Zero W until some days ago, obviously using embedded wireless module.
Now I can't see wlan0 in ifconfig command.
Where can I start debugging?
Thanks.
by Killertechno
Wed Feb 21, 2018 6:06 pm
Forum: Compute Module
Topic: Both UARTs enabled + serial (Linux) console on UART1. How to?
Replies: 4
Views: 1839

Re: Both UARTs enabled + serial (Linux) console on UART1. How to?

MaNu_MaLoNe wrote:
Wed Jan 24, 2018 6:35 pm

It worked. The only issue is that I had to place core_freq at 250Mhz in order to make the UART work with the correct baudrate.
Where?
by Killertechno
Wed Feb 21, 2018 5:55 pm
Forum: Compute Module
Topic: Powering the compute module
Replies: 0
Views: 463

Powering the compute module

Hi to all, I'm trying to design custom CM-IO board. I'm a bit confused about power supply: on datasheet it's reported CM1 has same hardware (more or less) of Raspberry PI A, while CM3 is quite similar to RPI3. Well, taking a look to datasheet (just for CM1) it's reported this about power requirement...
by Killertechno
Tue Feb 20, 2018 3:26 pm
Forum: Beginners
Topic: Status LED - Redirecting
Replies: 20
Views: 10443

Re: Status LED - Redirecting

Hi to all. Is this code for re-directing heartbeat from led to gpio.... or also to "clone" heartbeat? On Raspberry B+ v1.2 with stretch lite image (2017-11-29) I set config.txt as follows: dtoverlay=pi3-act-led,gpio=18 dtparam=act_led_trigger=heartbeat And now I have heartbeat on GPIO18. Green led (...
by Killertechno
Tue Feb 20, 2018 2:09 pm
Forum: Device Tree
Topic: Confirmation of gpio-poweroff Behavior
Replies: 19
Views: 12194

Re: Confirmation of gpio-poweroff Behavior

Mmh, ok, thanks for help.
Now I've just downloaded latest image (2017-11-29-raspbian-stretch-lite) and it correctly works, image I was previously using had missing dtoverlay entries.
by Killertechno
Tue Feb 20, 2018 11:54 am
Forum: Device Tree
Topic: Confirmation of gpio-poweroff Behavior
Replies: 19
Views: 12194

Re: Confirmation of gpio-poweroff Behavior

Hi to all!
Are these pins working on which version of Pi/Debian?
This looks perfect to use LTC2951 (1 or 2 version depending from enable state of DC/DC controller) through GPIO21 pin, is this right?
Image





But GPIO20 stands for.. what?
by Killertechno
Tue Feb 20, 2018 9:57 am
Forum: General discussion
Topic: linux-headers do not match kernel release
Replies: 3
Views: 2441

Re: linux-headers do not match kernel release

Clearly you should use the kernel-headers that is consistent with your kernel. I always have troubles compiling my custom kernel modules when using new Raspberry downloaded image. you can install package 'raspbian-kernel-headers'. I can't find package..... To "solve" using rpi-source (https://githu...
by Killertechno
Mon Feb 19, 2018 4:58 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: [kernel] Permissions of character device?
Replies: 0
Views: 376

[kernel] Permissions of character device?

Hi to all, I wrote a kernel driver some time ago, now not working at all (I suppose due kernel/OS changements). After some copy&paste&try work I finally got my kernel driver working (more or less) driving GPIO pins as I need. ... static dev_t first; static struct cdev c_dev; static struct class *cl;...
by Killertechno
Sun Feb 18, 2018 6:07 pm
Forum: Compute Module
Topic: [CM3] HC-SR04 driver available?
Replies: 1
Views: 703

[CM3] HC-SR04 driver available?

Hy guys, I would like to connect HC-SR04 sensor to my CM3 board (I want use character device as exercise, nor Python library or similar) My OS: Raspbian GNU/Linux 8 (jessie) Kernel: 4.14.18 Processor: BCM2709 My old HC-SR04 driver is not working (maybe changed something in kernel/Debian), I have alr...
by Killertechno
Tue Feb 13, 2018 10:32 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Simple LED Driver for RPi 2 Model B v1.1
Replies: 10
Views: 3990

Re: Simple LED Driver for RPi 2 Model B v1.1

OMG, so now I need to handle device tree too!?!?
Can you tell me latest raspbian direct register access was working? I'm worried my kernel drivers will stop working if I'll update/upgrade....
by Killertechno
Mon Feb 12, 2018 5:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Simple LED Driver for RPi 2 Model B v1.1
Replies: 10
Views: 3990

Re: Simple LED Driver for RPi 2 Model B v1.1

Hi guys, I'm tryink kernel module for led blinking...
I'm using B+ model, I can get no GPIO blinking.
So, what's correct GPIO_BASE value?
Does LED 21 value stands for GPIO21 pin?
tHANKS.
by Killertechno
Mon Feb 12, 2018 4:59 pm
Forum: General discussion
Topic: Kernel module for fleshing led on Pi
Replies: 9
Views: 1583

Re: Kernel module for fleshing led on Pi

On the web there are tons of kernel examples, but not always working. I've developed simple kernel modules (x example driving GPIO pin for custom application), but when downloading new Raspberry image kernel module was working no more. Now I would like create my custom kernel module for Compute Modu...
by Killertechno
Mon Feb 12, 2018 2:56 pm
Forum: C/C++
Topic: Need help / Kernel module using GPIO
Replies: 9
Views: 3612

Re: Need help / Kernel module using GPIO

Hi guys, I apologize if I'm resuming old discussion, but it's just 3:45pm and I WANNA DIE!!!!!!!!!!!! I'm newbie about kernel, so to write my custom kernel module I need to take code pieces from several kernel examples and merge it toghether to make kernel module working. After much work (and much m...
by Killertechno
Mon Jan 22, 2018 5:01 pm
Forum: Compute Module
Topic: SDIO for Wifi/Bluetooth module
Replies: 93
Views: 43365

Re: SDIO for Wifi/Bluetooth module

Sorry guys, I hope to not bother nobody.... I'm migrating from ZeroW and I'm trying to avoid to use CM -> USB connector -> USB connector -> WiFi module. Are there WiFi modules (only 2,4 or both 2,4/5 GHz) compatible with Raspberry CM? I'm a bit confused, I can find a lot of WiFi modules with SDIO in...
by Killertechno
Mon Jan 22, 2018 4:33 pm
Forum: Compute Module
Topic: CM3 SDIO WiFi and eMMC
Replies: 4
Views: 2994

Re: CM3 SDIO WiFi and eMMC

Sorry guys, I need to quickly order CM and CM board and I'm still a bit confused: with SDIO interface available, can I put wifi card with SDIO interface? Are there chipsets/modules ready for CM? SD card on CM interface, is it avalable (for BOOT) only on CM3L? Or can I get microSD for booting also on...
by Killertechno
Sat Jan 20, 2018 11:13 am
Forum: General discussion
Topic: Compute IO Board Cost
Replies: 10
Views: 1457

Re: Compute IO Board Cost

handles enough power What????? I mean, does CM3 really needs so much power than CM1? I'm migrating from Zero (reading from serial port and writing to a second serial port using USB to serial adapter, just this), battery powered application to CM due to flexibility of CM board on OEM applications. S...
by Killertechno
Fri Jan 19, 2018 2:12 pm
Forum: General discussion
Topic: Compute IO Board Cost
Replies: 10
Views: 1457

Re: Compute IO Board Cost

Hi to all, I'm taking a look to Compute IO boards on RS: version 1 it's 20 euro while version 2 it's 113 euro (6 times greater).
At first look to schematics I can see only microSD card (absent in v1 board), so why so expensive?

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