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#11
New Product Ideas / Re: ARM64 SOM for industrial a...
Last post by LubOlimex - November 25, 2024, 08:45:36 AMThe operating temperature of the RK3328-SOM is from -25 degrees C up to 85 degrees C (-25+85)°C.
Notice: The operating temperature of the demo board of peripherals RK3328-SOM-EVB is 0°C to 70°C.
Notice: The operating temperature of the demo board of peripherals RK3328-SOM-EVB is 0°C to 70°C.
#12
ESP32 / Re: S3 and disabling CH340X
Last post by LubOlimex - November 25, 2024, 08:36:00 AMUnfortunately, it is impossible to circumvent the CH340x even with hardware modification. The CH340X is directly connected to the 3.3V line and disabling that would also disable the powering of the module.
#13
New Product Ideas / RVPC improvement
Last post by Stan6314 - November 23, 2024, 07:37:46 PMHi guys,
I remembered the old days with RVPC. It's a nice toy...
I discovered a small bug during testing. RVMON 1.0 changes the idle state when beeping after the signal ends. So after every second beep, current continues to flow through the speaker. If you ever modify RVMOV again, it would be a good idea to fix it.
When I was thinking about RVPC, it occurred to me that if instead of CH32V003J4M6 ...A4M6 were used, an I2C bus could be brought out. The user could solder an I2C EEPROM to it. Then it would be possible to save the work done on a "cassette recorder" (or floppy disk?)
Even if it were a 2 Euro computer, everyone would be happy to add 1 Euro for a floppy disk drive
And implementing Tiny Basic would be perfection itself.
Good luck with your future work. Stan
I remembered the old days with RVPC. It's a nice toy...
I discovered a small bug during testing. RVMON 1.0 changes the idle state when beeping after the signal ends. So after every second beep, current continues to flow through the speaker. If you ever modify RVMOV again, it would be a good idea to fix it.
When I was thinking about RVPC, it occurred to me that if instead of CH32V003J4M6 ...A4M6 were used, an I2C bus could be brought out. The user could solder an I2C EEPROM to it. Then it would be possible to save the work done on a "cassette recorder" (or floppy disk?)
Even if it were a 2 Euro computer, everyone would be happy to add 1 Euro for a floppy disk drive
And implementing Tiny Basic would be perfection itself.
Good luck with your future work. Stan
#14
ESP32 / S3 and disabling CH340X
Last post by timokett81 - November 23, 2024, 04:43:07 PMIt is mentioned in in https://www.olimex.com/Products/IoT/ESP32-S3/ESP32-S3-DevKit-Lipo/open-source-hardware that the power consumption is about 200 uA where CH340X takes about 50-150 uA.
In order to cut down ESP32-S3 power consumption, the CH340X could be unpowered by e.g. cutting some foil in PCB. Is there a clear point in PCB where this could be done or even jumper that could be unsoldered?
In order to cut down ESP32-S3 power consumption, the CH340X could be unpowered by e.g. cutting some foil in PCB. Is there a clear point in PCB where this could be done or even jumper that could be unsoldered?
#15
FPGA / Re: SPI only, or NVCM also?
Last post by Hugh Aguilar - November 23, 2024, 08:42:41 AMQuote from: LubOlimex on November 22, 2024, 08:12:27 AMAll HX series (like iCE40HX8K-CT256) have NVCM.The LM versions don't have NVCM. I was just making sure that is not what you have on your board.
thanks for the info --- Hugh
#16
New Product Ideas / Re: ARM64 SOM for industrial a...
Last post by thom_nic - November 23, 2024, 04:10:02 AMOk thanks.
The real dealbreaker is that an SBC won't fit inside our product - it's huge - and has a bunch of connectors that we don't need and are in fact all in the way. We can only use a SOM that mounts on a mainboard with a fine pitch header, and we'll put the peripheral connectors on our mainboard.
Edit: it seems the RK3328-SOM is the closest arm64 that meets our requirements based on what is offered today. I hesitate because the data sheet doesn't advertise industrial temp operation range. But it could still work.
The real dealbreaker is that an SBC won't fit inside our product - it's huge - and has a bunch of connectors that we don't need and are in fact all in the way. We can only use a SOM that mounts on a mainboard with a fine pitch header, and we'll put the peripheral connectors on our mainboard.
Edit: it seems the RK3328-SOM is the closest arm64 that meets our requirements based on what is offered today. I hesitate because the data sheet doesn't advertise industrial temp operation range. But it could still work.
#17
ESP32 / Re: ESP32-PRO with arduino: us...
Last post by LubOlimex - November 22, 2024, 04:49:15 PMUmm, this connection is not SPI, it is called 4-bit SD mode. Refer to this article:
https://docs.espressif.com/projects/esp-idf/en/v5.3.1/esp32/api-reference/peripherals/sdio_slave.html
https://docs.espressif.com/projects/esp-idf/en/v5.3.1/esp32/api-reference/peripherals/sdio_slave.html
#18
FPGA / Re: SPI only, or NVCM also?
Last post by LubOlimex - November 22, 2024, 08:12:27 AMI don't see why it shouldn't allow NVCM since the main chip has that feature. All HX series (like iCE40HX8K-CT256) have NVCM. It is internal memory in the chip. Refer to Chapter 4 of this document:
http://www.latticesemi.com/view_document?document_id=46502
http://www.latticesemi.com/view_document?document_id=46502
#19
FPGA / SPI only, or NVCM also?
Last post by Hugh Aguilar - November 22, 2024, 06:28:27 AMI haven't read though this section of the forum, so please pardon me if this question has already been answered.
Does your iCE40HX8K-EVB allow programming through NVCM, or only SPI?
SPI can be written to many times, so it is for development. NVCM is write-once so it is for the production version. The problem with SPI is that it can be read, and there is a tool available for decompiling this into Verilog, so the design can be reverse-engineered.
What I would like to do is get a processor running on the HX8K. This would be a superset of the 65c02 ISA (a few extras, such as multiplication and access to RAM beyond 64KB). Being 65c02, my compiler for the NEO6502 could also generate code for this. And of course I would have a heartbeat timer, that the NEO6502 sorely lacks!
I don't want to have my design in SPI though, because it would just get reverse-engineered. Red China is the primary problem, but there are bad actors in the Western world too. I don't want to put a lot of work into this, then find somebody selling an HX8K board that does something useful and uses my processor design and my compiler. I'm not an altruist --- I don't want to help people make money.
Does your iCE40HX8K-EVB allow programming through NVCM, or only SPI?
SPI can be written to many times, so it is for development. NVCM is write-once so it is for the production version. The problem with SPI is that it can be read, and there is a tool available for decompiling this into Verilog, so the design can be reverse-engineered.
What I would like to do is get a processor running on the HX8K. This would be a superset of the 65c02 ISA (a few extras, such as multiplication and access to RAM beyond 64KB). Being 65c02, my compiler for the NEO6502 could also generate code for this. And of course I would have a heartbeat timer, that the NEO6502 sorely lacks!
I don't want to have my design in SPI though, because it would just get reverse-engineered. Red China is the primary problem, but there are bad actors in the Western world too. I don't want to put a lot of work into this, then find somebody selling an HX8K board that does something useful and uses my processor design and my compiler. I'm not an altruist --- I don't want to help people make money.
#20
ESP32 / Re: ESP32-EVB Relay rating
Last post by LubOlimex - November 21, 2024, 02:11:01 PM240V is fine, this is the datasheet of the relay:
https://www.tme.eu/Document/facc22af0219a1d2944a33df4662b473/LEG-F-SERIES.pdf
https://www.tme.eu/Document/facc22af0219a1d2944a33df4662b473/LEG-F-SERIES.pdf