DPI Project and Task List

New FPGA card

• 2 rows of 40 pins to give 10 peripheral slots
• optional 1 row of 16 pins for host interface card
• USB Serial interface with CP2102
• easy to cut serial traces and header for raw serial
• optional host RTS line for board reset
• smaller 98x48mm form factor
• SPI configuration flash.
• SPI flash is seen as a peripheral for new code download
• 5 Volt input, onboard 3.3 and 1.2 volt regulators
• 40/50 MHz crystal
• new Verilog serial host interface (first using existing FPGA card)

Dual voltage/current controlled motor controller

• See https://www.ebay.com/itm/XL4015-5A-Step-Down-Buck-Converter-Module-DC-DC-Power-Supply-LED-Lithium-Charger/263587316867?hash=item3d5f074483:g:4SQAAOSw2hhcgHTnItem
• XL4015. PWM for voltage control. Cycle stealing for current control.
• Use digital pots to set voltage/current. https://demandperipherals.com/cards/qpot.html
• Use AVR to set H-bridge direction and monitor voltage/current
• Low cost NFETs for H-bridge can have high gate capacitance
• Design to work with 7474 DPI circuit or direct SPI
• No new Verilog
• This might be a big seller

9-axis IMU card

• BNO055 based so we do not do Kalman filters
• We could buy/mount https://www.adafruit.com/product/4646 if needed

Qwiic interface card

• FPGA to Qwiic interface with multiple Qwiic connectors
• No new Verilog.
• Maybe Linux drivers for several popular Qwiic cards

Grove interface card

• FPGA to Grove interface with multiple Grove connectors
• No new Verilog.
• Maybe Linux drivers for several popular Grove cards

Programmable power supply

• XL4015 based design as above
• AVR and quad digital pot to control.
• ZXCT1107 for high side current monitor
• No new Verilog

RFID reader card

• PN532 based
• Similar to https://www.adafruit.com/product/364
• “half size” card. 98x48mm

Waveform generator card

• Based on AD9833 or similar
• Similar to Mikroe-3309
• Probably no new Verilog
• Simple Linux API

Frequency counter card

• (prescaler, into GHz range) output so low we can count it.
• Uses the count4 Verilog peripheral or a derivative of it

A GPS receiver card (for absolute time sync and accurate frequency generation)

• May be based on, or just carrier card of, existing GPS/GNSS receivers, yes
• See the current GPS interface in dpdeaemon for the existing API
• Ref frequency generator from GPS signal, 10MHz output for test equipment (multiple driver outputs to sync many measurement devices)

Galvanic insulated Volt meter

• (low freq) (measure volt/current in LAB situations) safe for ground loops etc
• Optical / transformer / RF gap ?

Galvanic insulated Thermocouple interface

• test bench equipment

A generic signal conditioning board

• some op-amps, low pass filter
• dip switch / jumper to configure ?

Other Thoughts about cards

• 4-20 mA interface to somehow integrate commercial sensors into fpga/linux backend
• I2C ground loop break (level conversion and always safe) to I2C , grove, Qwiic devices
• One New board with some switches, a few LEDS and a LCD display, nicely done, visual and size compatible to rest of platform (a little control interface)
• CAN BUS system integration New Chips available, (tribe of car enthousiasts will welcome this)
• ACS71240 Integrated Current Sensor (hall sensor type, insulated measurement, high bandwidth)
• Talking to chargers and electric cars : https://en.wikipedia.org/wiki/ISO_15118 some interface for this
• Current controller/generator (starting at low current) upto 0.5 amp, used to power LED lighting applications (panels)
• Sub GHz tranceiver Si4464/63/61/60 used in smart metering,
  • allows many protocols (also known to me from balloon telemetry application
  • ranging 150 km without special antenna (line of sight)
  • used in remote control and logging of factory equipment (preventive maintenance) and sensors in the field
  • thinking about making it into a AX25 mesh network

Analog CPLD card

• SLG46826 GreenPak chip with SPI
• May need new Verilog
• Linux API needs definition

Weather sensor card

• Temperature, Humidity, Pressure, Light, UV Light
• No new Verilog if I2C sensors

Brushless DC motor controller (?)

• Based on the ATA6843 or similar

Silent stepper motor controller with all the trimmings TMC2226

• http://www.farnell.com/datasheets/3119148.pdf
• https://nl.farnell.com/trinamic/tmc2226-bob/breakout-board-stepper-motor-driver/dp/3439212?st=tmc2226
• API to be defined
• Most likely based on low speed serial peripheral

DCC Model Railroad controller

• Based on one channel of the current H-bridge
• New Verilog required but a fairly simple design
• recently found out this is a tribe, “model railroad builders”
• Have a board on my desk right now to fix LED lighting of a model

Battery management card (?)

• Coulomb counter, voltage per cell
• Balancing charger
• Remote on/off
• Multiple output connectors

SD Card Reader (?)

• One bit SPI interface

Configurable voltage regulator card (?)

• 3.3/3.7/5/6 volt selectable via jumper
• could be some lm317 with resistors, jumpers or switches
• does it need to be high power?
• typical use case for this board?

Serial ports

• Quad low speed serial output
• Quad low speed serial input
• Dual low speed serial output with flow control
• Dual low speed serial input with flow control
• Dual serial input/output without flow control
• Single low speed serial port with flow control

Microstepping stepper motor controller

• Uses existing dual H-bridge or quad open-drain driver
• Sine/cosine lookup table
• Phase accumulator implementation (?)

Broadcast ultrasonic ping

• Current ping peripheral does one of eight sensors at a time
• New peripherals pings all sensors simultaneously.
• 8X improvement in response time

Logic analyzer (?)

• Use all input pins as part of a logic analyzer
• Limited to 20 MHz sampling rate
• Configurable trigger value, hold-off, and pre-trigger.
• Output to GTKWave or Sigrok