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Forum Index : Microcontroller and PC projects : New SOM for a CMM3.....(only joking)
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
The thread title is in jest, but this is quite an interesting module: SOM Features: - SAMA5D2 ARM processor @ 500MHz with a 166MHz bus speed - 1Gb(128MB) DDR2 SDRAM (good for graphics memory!) - 1Kb(128 byte) serial EEPROM - 64Mb(8MB) QSPI EEPROM - 10/100 Network PHY - 103 I/O lines - 1x USB device - 1x USB host - 24-bit LCD interface - UART - ADC inputs - CAN - I2S - I2C - SPI - eMMC - SDIO - SD card - Camera support - Class D stereo - 0.8mm castellated pins - 40mm x 38mm module size Costs $48 per module, which is about what it cost for the ARM in the CMM2 just before supplies ran out. Quite a good collection of hardware there for less then fifty bucks. They don't mention if the ARM processor is more then one core or not - would need to look at the actual ARM datasheet to find out. They also do a W version of this module, that also has a wireless network module fitted, but that one is more expensive at about $75. Interesting module. As I mentioned at the start, I'm not really expecting MMBASIC to be ported to this module for a few reasons, one of which was Peter saying he does not want to do/is not going to do any more ports(and fair enough!), but this is quite an impressive amount of stuff on the one module that basically costs about the same as what the single ARM chip used in the CMM2 did before supplies ran out completely. And this already has juicy SRAM on board, so no need to add any external RAM chips. Despite the shortages of chips in many areas, people like Microchip still seem to be ploughing ahead with new concepts and designs.  Smoke makes things work. When the smoke gets out, it stops! |
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Turbo46 Guru  Joined: 24/12/2017 Location: AustraliaPosts: 1611 |
You never know... Bill Keep safe. Live long and prosper. |
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IanRogers Senior Member  Joined: 09/12/2022 Location: United KingdomPosts: 151 |
Also Ooh! Hello webmite. Edited 2023-04-18 17:15 by IanRogers I'd give my left arm to be ambidextrous |
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| al18 Senior Member Joined: 06/07/2019 Location: United StatesPosts: 205 |
The CMM2 chip has been out of stock for 2 years. Distributors are predicting it will be in stock May 2024. Why would anyone design a new board based on a CPU from Microchip, based on their past track record? |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6812 |
It's not necessarily Microchip's fault. They have a huge product range and they'll concentrate on getting the high demand chips in production first. Also, the silicon shortage was partly because of any bulk users rapidly buying up all available stocks so that they could complete existing production runs. It's left the manufacturers in a bit of a sticky situation. It had got that bad that even voltage regulators were in short supply, and they are bread & butter. Of course, you can also blame the JIT systems that distributors run so that they don't need to carry much stock. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3815 |
I'm surprised the (Arduino) Portenta H7 chip (STM32H747XIH6) seems to be available as it's kinda similar to the CMM2's STM32H753 (/743). Sadly, not identical. John |
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| toml_12953 Guru Joined: 13/02/2015 Location: United StatesPosts: 339 |
I don't know if it's still available but we used to be able to request the source for CMM2 BASIC and port it ourselves. Maybe if you were willing to commit to provide support for it, Peter or whoever would offer your port to users. |
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| zeitfest Guru Joined: 31/07/2019 Location: AustraliaPosts: 483 |
One to watch maybe.. (in stock at least) adafruit M7 Edited 2023-04-19 11:28 by zeitfest |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
The ARM chip at the heart of the CMM2 is not a Microchip part. It is manufactured by ST, so you're blaming the wrong supplier and brand there.  Still, I know EXACTLY what you mean, and have already ported several of my mission-critical things over to use the PicoMite, cos I have been having a real hard time obtaining the various PIC32 chips from Microchip Direct, but I can easily get fistfulls of PicoMite or PM clone boards from the likes of WaveShare etc. I guess it was probably just luck. I expect that Raspberry Pi had just received a production run of the RP2040 chip just before the virus took over - and shut down - the world for a year or two. So, they had plenty of chips they could sell, while all the other supply lines dried up! In fact, if not for the virus, I don't know that we would even have the PicoMite.  Smoke makes things work. When the smoke gets out, it stops! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6812 |
The RP2040 is fairly "old tech" (around 15 years) in chip process terms (only 2 sq mm of 40nm silicon). There has been a big demand for 22nm and 28nm process sizes. 40nm is really a stop-gap size between 32nm and 45nm but it's becoming much more popular as the price falls. :) It's quite possible that the fab(s) had spare capacity at 40mn when the RP2040 was being made. 2 sq mm gives lot of chips to a wafer too! Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3815 |
It's attractive except it probably would need a huge (i.e. complete) rewrite of the I/O, video, etc code. A look-alike for the STM32 chip INCLUDING video, I/O etc would make it more plausible. John |
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| al18 Senior Member Joined: 06/07/2019 Location: United StatesPosts: 205 |
You are right, the CMM2 uses a ST chip. Sorry for busting on Microchip. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3815 |
Though Microchip have also had difficulty supplying CPUs. Many other makers, too. John |
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