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Without problems.
Use USB->FTDI->RS485 transceiver and connect it directly to USB port of raspberry PI.
Then, use A,B and GND cables and connect to your PIC device which also has RS485->UART transceiver.
Google finds for "sram array design" a lot of stuff, including PDF file which I won't link here because of bad forum rules, sorry.
You can do it yourself though.
USBasp is not VCP port.
It is not programmed as CDC device. You need new drivers on computer AND new software on MCU.
Buy cheap USB<->UART converter on ebay for 1-2$.
I can give you a link to my GPS library, where you can easily change settings you need.
Important is only high layer.
Unfortunatelly, admins will ban me if I put link here. Contact me via PM if you want link.
That's kind a bad question.
It is voltage divider between R1 and R2. On PMOS it is connected to +, on NMOS to - terminal of OP-amp.
In case NMOS (I think more often used and more stable) you have non inverting feedback:
Vout = Vref(1 + R1 / R2) where Vref is voltage connected to + terminal...
I was talking about real ethernet, so with external PHY and connected to ETH peripheral.
On STM32F429-Discovery, I have posted on my blog, you need to make modifications on pins, because there is gyro and some other pins which interfere with 50MHz RMII connection.
W5100 is really nice for SPI...
I'm here also for suggest you STM32.
STM32F401 is 84MHz, powerful way too much for your CNC.
It can be done with F103 or less.
My 3D printer has Atmega2560 at 16MHz, no need more!
You must know, that Atmel's SAMA5 is Cortex A5 and is not microcontroller, but microprocessor. You will need something here so it will be able to handle everything.
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