crap-o-scope

I'm building a 6bit colour vga board for our FPGA work group. This started off as a test program but I got carried away and built a very poor scope instead.

uses 1092 of 1280 tiles on the ICE40H1k (IceStick) and 12 of 16 block rams.

spec

• VGA display: 640 x 480 in glorious 6 bit colour!
• 10bit ADC clocked from the VGA clock - results in 1.5MHz sample rate
• 600 sample depth storage!
• graphical display of trigger level
• numerical display of sample level, number of triggers etc.

design overview

graphics modules split up into:

• vga.v generator from my virtual graffiti project: https://github.com/mattvenn/fpga-virtual-graf
• color_sq.v for drawing a 2 colour bar graph
• grid.v for the reticule
• numbers.v for the display of the 4 x 4 hex numbers
• waveform.v for connecting the dots of the samples with lines

other:

• adc.v for reading the ADC
• debounce.v for debouncing the encoder
• encoder.v for converting quadrature encoder to a count

useful modules from https://github.com/juanmard/screen-numbers

• fontROM.v implements a BRAM that can be initialised from a list (used for the numbers and the sample storage)
• image.v selects a pixel from the fontROM BRAM

thanks

• icestorm opensource FPGA tools.

License

Licensed under GPL-2.0.