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#91
A20 / Question about using SPI NAND ...
Last post by evelynwang - June 12, 2025, 02:28:26 PMHi everyone,
I'm designing a custom board based on the A20-SOM from Olimex and looking into replacing the standard NAND/eMMC flash with an SPI NAND solution (probably a 1Gb Winbond or GigaDevice part).
I've gone through the A20 datasheet and see SPI interfaces are available, but I'm not sure about bootloader compatibility or how U-Boot handles SPI NAND on this SoC. Has anyone here successfully used SPI NAND as the primary storage/boot medium with an A20-based system?
Would really appreciate any pointers—whether it's DTS changes, U-Boot configs, or just general lessons learned. Thanks!
I'm designing a custom board based on the A20-SOM from Olimex and looking into replacing the standard NAND/eMMC flash with an SPI NAND solution (probably a 1Gb Winbond or GigaDevice part).
I've gone through the A20 datasheet and see SPI interfaces are available, but I'm not sure about bootloader compatibility or how U-Boot handles SPI NAND on this SoC. Has anyone here successfully used SPI NAND as the primary storage/boot medium with an A20-based system?
Would really appreciate any pointers—whether it's DTS changes, U-Boot configs, or just general lessons learned. Thanks!
#92
New Products release / Re: ADS1220 wiring on Raspberr...
Last post by LubOlimex - June 12, 2025, 12:57:38 PMThe clock is CLK.
Just connect AVSS and GND to GND of the Pi 4B.
For VDD and AVDD connect them to the 3.3V of the Pi 4B.
Maybe also check this project:
https://github.com/OLIMEX/BB-ADS1220/tree/master/SOFTWARE/OLINUXINO
Just connect AVSS and GND to GND of the Pi 4B.
For VDD and AVDD connect them to the 3.3V of the Pi 4B.
Maybe also check this project:
https://github.com/OLIMEX/BB-ADS1220/tree/master/SOFTWARE/OLINUXINO
#93
ESP32 / Re: ESP32-POE-ISO
Last post by LubOlimex - June 12, 2025, 12:46:09 PMWe don't maintain the MicroPython binary or code.
My advice is reach to the MicroPython community for what can be done.
My advice is reach to the MicroPython community for what can be done.
#94
New Products release / ADS1220 wiring on Raspberry Pi...
Last post by Suasua44 - June 12, 2025, 12:21:17 PMHi everyone,
I'm trying to connect an Olimex ADS1220 on my Raspberry Pi 4B.
I'm a beginner with this kind of SPI ADC and I don't really know how to properly wire it to the RPi. Particularly, I don't understand why there is two AVSS pins and where is the SCLK pin.
Thank you in advance for helping me !
Sua
I'm trying to connect an Olimex ADS1220 on my Raspberry Pi 4B.
I'm a beginner with this kind of SPI ADC and I don't really know how to properly wire it to the RPi. Particularly, I don't understand why there is two AVSS pins and where is the SCLK pin.
Thank you in advance for helping me !
Sua
#95
ESP32 / ESP32-POE-ISO
Last post by bailey@comcap.net - June 12, 2025, 10:09:24 AMI am using an ESP32-POE-ISO running OLIMEX_ESP32_POE-20241129-v1.24.1.bin.
I'm not entirely sure if you guys maintain the MicroPython binary?
I'm having trouble using sockets - specifically I am trying to mark the packets with TOS/DSCP QoS settings. It doesn't look like the binary currently supports this?
Would it be possible to enable the socket options specifically TOS?
Thanks,
Bailey
I'm not entirely sure if you guys maintain the MicroPython binary?
I'm having trouble using sockets - specifically I am trying to mark the packets with TOS/DSCP QoS settings. It doesn't look like the binary currently supports this?
Would it be possible to enable the socket options specifically TOS?
Thanks,
Bailey
#96
A20 / Re: OLinuXimo A20 LIME2 : use ...
Last post by LubOlimex - June 11, 2025, 08:11:21 AMThere are a few options:
1) You can use the LIME2-SHIELD:
https://www.olimex.com/Products/OLinuXino/A20/LIME2-SHIELD/open-source-hardware
2) You can get one or more A20-OLinuXino-LIME2-UEXT adapter(s) - this adapts 0.05" LIME pins of the GPIO/LCD connectors to breadboard-friendly 0.1" step connectors. Notice that it comes WITHOUT CABLES!!!
https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-LIME2-UEXT/open-source-hardware
Cables:
https://www.olimex.com/Products/Components/Cables/Ribbon/CABLE-40-40-10CM/
https://www.olimex.com/Products/Components/Cables/Ribbon/CABLE-IDC40-15cm/
3) You can purchase matching female connectors FEMALE-YAV36P-2x20. This will still require soldering at the female connectors but your board will be safe:
https://www.olimex.com/Products/Components/Connectors/FEMALE-YAV36P-2x20/
1) You can use the LIME2-SHIELD:
https://www.olimex.com/Products/OLinuXino/A20/LIME2-SHIELD/open-source-hardware
2) You can get one or more A20-OLinuXino-LIME2-UEXT adapter(s) - this adapts 0.05" LIME pins of the GPIO/LCD connectors to breadboard-friendly 0.1" step connectors. Notice that it comes WITHOUT CABLES!!!
https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-LIME2-UEXT/open-source-hardware
Cables:
https://www.olimex.com/Products/Components/Cables/Ribbon/CABLE-40-40-10CM/
https://www.olimex.com/Products/Components/Cables/Ribbon/CABLE-IDC40-15cm/
3) You can purchase matching female connectors FEMALE-YAV36P-2x20. This will still require soldering at the female connectors but your board will be safe:
https://www.olimex.com/Products/Components/Connectors/FEMALE-YAV36P-2x20/
#97
A20 / OLinuXimo A20 LIME2 : use GPIO
Last post by abriotde - June 10, 2025, 07:02:25 PMI have an OLinuXimo-A20-LIME2 card PC. I would like to use GPIO but I don't understand how could I physically connect them. In the manual, all GPIO are listed. I know with one to use, but male pins on the card are to thin for standard jumper wires (https://www.olimex.com/Products/Breadboarding/JUMPER-WIRES/JW-200x40-FM/). I can solder it, it's to thin...
#98
NXP / Case for iMX8MP-SOM-EVB-IND?
Last post by ilario - June 10, 2025, 04:58:28 PMIs there a suggested case/enclosing/box that can be used with iMX8MP-SOM-EVB-IND?
#99
New Products release / UEXT-3TO5V converter
Last post by olimex - June 10, 2025, 02:29:50 PMNew open source hardware board UEXT-3TO5V allow 5V devices and sensors to be powered and accessed by 3.3V UEXT boards https://olimex.wordpress.com/2025/06/10/new-open-source-hardware-board-uext-3-to-5v-converter-allows-5v-devices-and-sensors-to-be-connected-to-uext-boards-with-3-3v-levels/ #uext #oshw #sensor #spi #i2c #uart
#100
ST / Re: LoRa-STM32WL-DevKIT: After...
Last post by Volker - June 09, 2025, 07:24:59 PM<comparison and evaluation of similar products is part of the engineering process>
It is also part of the engineering process to decide if a project is a waste of time and resources or not.
See, we did put a lot of time into this project.
1. It took a lot of time to find out that the onboard debugger interface is no more working. https://www.olimex.com/forum/index.php?topic=9750.0
2. It took a lot of time to find out that the firmware of the module does not receive (or handle) the joined message properly.
3. We also found that the peripheral chip for the sensors is not initialized properly. One has to reset the chip after power-on to get it running.
This is why we give up. It is more efficient to use another module with less buggy software as a starting point.
It is also part of the engineering process to decide if a project is a waste of time and resources or not.
See, we did put a lot of time into this project.
1. It took a lot of time to find out that the onboard debugger interface is no more working. https://www.olimex.com/forum/index.php?topic=9750.0
2. It took a lot of time to find out that the firmware of the module does not receive (or handle) the joined message properly.
3. We also found that the peripheral chip for the sensors is not initialized properly. One has to reset the chip after power-on to get it running.
This is why we give up. It is more efficient to use another module with less buggy software as a starting point.