The last issues with STM32MP1 mainline Linux kernel support were resolved and now we run STMP157-OLinuXino-LIME2 in production!
Revision B fixes all hardware issues in the initial prototype. STMP157-OLINUXINO-LIME2 is complete analog of A20-OLinuXino-LIME2 which is one of our best selling Allwinner board.
Mainline uboot and Linux kernel 5.12 images are available with all periperials working.
We will have STMP157-OLINUXINO-LIME2 on our web for sale by the end of April.
This is also our first board with Ethernet supporting Precise Time Protocol and Time Sensitive Networking implemented.
The Time Sensitive Networking (TSN) is for real-time communication with hard, non-negotiable time boundaries for end-to-end transmission latencies.
The main use of TSN is for industrial machine controllers, robots etc.
For this purpose all devices in this network need to have a common time reference and therefore, need to synchronize their clocks among each other. Only through synchronized clocks, it is possible for all network devices to operate in unison and execute the required operation at exactly the required point in time.
The time in TSN networks is usually distributed from one central time source directly through the network itself using the IEEE 1588 Precision Time Protocol, which utilizes Ethernet frames to distribute time synchronization information.
Linutronix helped to implement IEEE 1588 PTP on STMP1-OLinuXino-LIME2.
For Uboot changes Olimex Uboot was used as base. The Kernel patch is sent upstream and can be seen on the mailing list
A64-OLinuXino is Open Source Hardware Quad core 64 bit Linux Computer.
We also offer nice metal box for it named BOX-A64-BLACK:
The only problem was that A64-OLinuXino have option for on board WiFi-BT but it uses PCB antenna and when put in box the communication range was decreasing signiificantly.
New revision of A64-OLinuXino board now supports both internal PCB antenna and U.FL externally attached 2.4Ghz antenna.
So A64-OLinuXino can be put inside the metal box and have the antenna outside:
STMP1-OLinuXino-LIME2 Industrial grade Linux Computer project took us almost an year of work to build proper software support for our hardware with mainline uboot and kernel.
ST demo board uses Yocto with kernel 5.4, our images use Linux Kernel 5.10.12
These who monitor our Official images at https://images.olimex.com probably nottice that we already have images with Debian Buster and Ubuntu Focal for STM32MP1 where almost everything now work with mainline Linux Kernel 5.10.12.
We had lot of troubles around the Ethernet, but now it works pretty well!
CAN-FD – works!
Two USB High speed hosts with 1A current – works!
LCD – works
HDMI – works!
eMMC Flash boot – works!
PMU and LiPo charger battery support – works
Two things on this board left not complete:
low power modes
USB-OTG
New prototypes rev.B now are in production, the Chinese New Year will delay them to end of February. We hope meantime to solve these two last issues and run production.
UPDATE: As some people wanted to know what was the Ethernet issue we were struggling so long, I posted in the comment section.
For the USB-OTG my guess is that it’s also some silly issue so people may help:
STM32MP1 has two High speed USB hosts and one Full speed USB-OTG, here is snip from their Hardware development document:
Here is our schematic which follows above guide:
The two High Speed USB hosts work as expected, but the USB-OTG has issue summarized here: https://pastebin.com/i6G90kdg
What makes us a little bit suspicious is that STM in their own demo board didn’t follow their Hardware Guide and were wiring one of their High speed USB as OTG and connecting USB hub to the other, ignoring the Full speed USB at all.
eduArdu is educational low cost Arduino board, it has plenty of resources like: LED 8×8 display, Joystick, Buzzer, Microphone, temperature sensor, Ultrasound distance meter, PIR sensor, IR emitter and receiver, Capacitive buttons, RGB LED, Lipo charger for stand alone work.
Here we will show you how you can drive high voltage loads like lamps, heaters etc with PWR-SWITCH connected to eduArdu.
Plug PWR-SWITCH in mains and the object you want to control plug in PWR-SWITCH receptacle.
void setup() {
pinMode(0, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(0, HIGH); // turn the PWR-SWITCH on
delay(5000); // wait for a 5 seconds
digitalWrite(0, LOW); // turn the PWR-SWITCH on
delay(5000); // wait for a 5 seconds
}
The Lamp will start to blink 5 seconds on and 5 seconds off.
In this setup connect “-” termianl of PWR-SWITCH input to LIME2-SHIELD GPIO.pin9 and “+” terminal of PWR-SWITCH input to LIME2-SHIELD GPIO.pin7 (GPIO271 in Linux) and you can use this code to switch on and off PWR-SWITCH:
!/usr/bin/env python
from pyA20Lime2.gpio import gpio
from pyA20Lime2.gpio import port
from pyA20Lime2.gpio import connector
gpio.init() #Initialize module. Always called first
gpio.setcfg(port.PI15, gpio.OUTPUT)
gpio.output(port.PI15, gpio.HIGH)
gpio.output(port.PI15, gpio.LOW)
Sometimes devices connected to USB ports need to be re-set. It’s not unusual GSM modems and WiFi dongles to freeze and the only way to bring them back to life is to remove and re-attach.
OLinuXino USB ports has power switches and current limiters which can be controller by Linux drivers.
After some experimenting we found that it’s not so easy actually to do it with the standard file system and shell.
A friend suggested to try this code. It worked very well, so here is how to use it. First you need to download and compile it, then to make it executable:
$ mkdir usbreset
$ cd usbreset
$ wget $ https://raw.githubusercontent.com/jkulesza/usbreset/master/usbreset.c
$ cc usbreset.c -o usbreset
$ chmod +x usbreset
Then you need to see where your USB device is. In our case I connected MOD-WIFI-R5370 WiFi USB dongle:
$ lsusb
you will see something like:
Bus 002 Device 039: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
to reset this device use the command:
./usbreset /dev/bus/usb/002/039
The device USB port will be power off for a second then power on again.
All above is tested and work with official Olimex Linux images from images.olimex.com, but should work on other Linux distributions too.
PWR-SWITCH hides the high voltage problems from the Arduino, ESP32, Raspberry Pi, Beaglebone, OLinuXino developers. It has 1500VAC optically isolation and can drive high voltage up to 230VAC / 16A loads safely.
To switch On or Off the loads from 3 to 24VDC can be used, so you can drive the loads with any microcontroller only 1mA is necessary to trigger the switch.
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