====== DPI Project and Task List ======
===== CARDS =====
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?
===== PERIPHERALS =====
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