charkster,github

mcp4728

Python driver for MCP4728 4 Channel DAC with I2C interface

mcp4812

Python driver for Microchip 2 channel DAC MCP4812 (SPI interface)

mux_board_v1

Custom PCB with Itsy Bitsy M0 controlling 4 ADG1606 16 input muxes

mux_board_v3

Custom PCB with SAMD21 QT PY controlling TWO ADG1606BRUZ 16 input muxes!

mux_board_v5

Custom PCB with SAMD21 QT PY controlling TWO ADG1606BRUZ 16 input muxes! This board is 30% smaller than V3 and uses a single 16x2 pin header.

programmable_delay

FPGA design to allow for programmable delay on a single signal. Implemented and tested on CMOD_A7

radxa_zero_3w_tigervnc

Instructions for enabling tigervnc-standalone-server on Radxa Zero 3W.

relay_usbtmc

Two relay channels are controlled with an Adafruit QT PY running USBTMC

rigol_ds1054z

Python Class for controlling the Rigol DS1054z Oscilloscope

Raspberry Pi 4 is used to drive ATPG stuck-at patterns to an IC. Python is used to drive the patterns and check for expected levels on the scan_out pins (4 chains in this example). A Perl script is used to parse the ATP pattern data into Python lists (I prefer to parse text files using Perl).

rpi_gadget_mode

Instructions for enabling USB (ethernet) gadget mode on RPi 4 and RPi Zero 2W.

rpi_level_shifter_v1

samd21-32bit-timer

SAMD21 32bit Timer

samd21-debounce_time

The rising and falling debounce duration between two pins is measured. Maximum debounce duration is 4 seconds rising or falling (no limit on how long both signals can be high for).

samd21-dma-gpio_high_time_and_period

This is a re-write of my samd21-gpio_high_and_low_durations project using DMA to move the CC0 and CC1 counter values instead of software. I wanted to see if DMA would improve performance (be able to sample faster/shorter pulses). The result is that DMA has about the same overhead as a tight software ISR loop. High pulses as short as 300ns can be sampled as long as the period is 1000ns or greater. This is about identical to the ISR performance.

samd21-gpio_edge_counter

Arduino gpio positive and negative edge counter for samd21 (Seeeduino Xiao, Trinket Mo, QT PY)

samd21-gpio_high_and_low_durations

This arduino code for SAMD21 will record a gpio's high and low duration for multiple pulses.

samd21-i2c_slave

This implements an i2c slave with a register map of 256 bytes in sram. The slave supports multi-byte writes and reads. It uses the "Wire" library.

samd21-i2c_slave_16bit_address

This implements an i2c slave with a register map of 16k bytes in sram (SAMD21 has a total of 32kB ram). A 2 byte write is needed to load a 14bit address. The slave supports multi-byte writes and reads. It uses the "Wire" library.

samd21-pulse_generator

A software defined pattern is given by serial input and then driven on a gpio pin. Fastest pattern has 2us intervals, but any interval may be specified.

samd21-usbtmc

SAMD21's ADC, DAC and GPIO are controllable with custom SCPI commands. World's smallest lab equipment.

samd21-usbtmc-ina260

Combine a SAMD21 and a INA260 to create a USBTMC instrument

samd21_serial_to_usbserial

This is a small modification of the Arduino Built-in Example "Use Multiple Serial Ports on the Arduino Mega". The UF2 file was compiled for the Adafruit SAMD21 QT PY, but the INO file should apply to many other MCUs.

samd51-gpio_high_and_low_durations

This arduino code for SAMD51 will record a gpio's high and low duration for multiple pulses.

scarf

SCARF - “Scarf Connects A Raspberry pi to Fpga”

spi_slave_verilog

SPI bus slave and flip-flop register memory map implemented in Verilog 2001 for FPGAs

stm32f411-adc

Single channel ADC conversion using software trigger. Individual registers are written to, not using the arduino library.

stm32f411-gpio_high_and_low_durations

This arduino code for STM32F411 will record a gpio's high and low duration for multiple pulses.

tang_nano-scarf_pat_gen_edge_counter

FPGA design for Tang Nano board. SCARF SPI slave with block ram slave, pattern generator slave and two edge counter slaves.

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