pederbs/nmigen-learning
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Fix off-by-one error in vga.dg and add vga.{h,v}blank_begin signals

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Peder Bergebakken Sundt 2020-08-20 01:15:28 +02:00
parent a9c023eb6a
commit 99504c4026
4 changed files with 14 additions and 9 deletions
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6
README.md
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@ -9,7 +9,7 @@ My focus is currently on:
* Effortless dependency management
* Helper functions for inspection and documentation of the design
* Helper functions for targeting multiple FPGA platforms and boards
* Creating PRs to other projects with stuff i find here
* Creating PRs to other projects with stuff I come across here
* Having fun with my FPGA
# Setup
@ -38,8 +38,8 @@ To reduce the amount of typing:
* Diagrams are nice
* Documentation generation would be nice
* A central nmigen-pmod library would be nice
* A central nmigen-pmod repository would be nice
* A RISCV toolchain would be nice (make socs, and compile C, C++ or Rust)
* nextpnr-xray or vtr would be nice
* nextpnr-prxray or vpr would be nice
* Batch setup of Vivado would be nice
* Ability to synth on a host accessible with ssh would be nice

1
fpga/icebreaker_vga.dg
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@ -19,6 +19,7 @@ Top = subclass Elaboratable where
# setup clock
pll_config = add_domain_from_pll platform dvi.pix_freq
print pll_config
# Feed a picture to the DVI controller

13
fpga/modules/vga.dg
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@ -56,7 +56,7 @@ VGA_TIMINGS = dict' # VGA, SVGA, VESA
# http://martin.hinner.info/vga/timing.html
run_gtf = x y fps ->
run_gtf = x y fps -> # TODO: pack this dependency with wasmtime?
out = subprocess.run ["gtf", str x, str y, str fps, "-x"]
capture_output: True
check: True
@ -86,6 +86,8 @@ VgaController = subclass Elaboratable where
@pixel_x = Signal$ range @active_x
@pixel_y = Signal$ range @active_y
@active = Signal!
@hblank_begin = Signal! # pulsed at start of hblank
@vblank_begin = Signal! # pulsed at start of vblank
# in
@r = Signal$ bitwidth
@ -113,9 +115,9 @@ VgaController = subclass Elaboratable where
@out = platform.request *: @resource
# pass along the color data
Sync$ @out.r ::= @r
Sync$ @out.g ::= @g
Sync$ @out.b ::= @b
Comb$ @out.r ::= @r
Comb$ @out.g ::= @g
Comb$ @out.b ::= @b
# position counters
counter_x = Signal$ range @total_x
@ -127,6 +129,9 @@ VgaController = subclass Elaboratable where
When (counter_y == @total_y - 1) $ ->
Sync$ counter_y ::= 0
Sync$ @hblank_begin ::= ((counter_x == @active_x))
Sync$ @vblank_begin ::= ((counter_x == @active_x) & (counter_y == @active_y - 1))
# drive vga syncs, data enable and user outputs
Comb$ @pixel_x ::= counter_x
Comb$ @pixel_y ::= counter_y

3
fpga/stdio/ice40pll.dg
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@ -4,7 +4,7 @@ import "/nmigen_dg/*"
import "/subprocess"
import "../common/pipeline"
run_icepll = current target ->
run_icepll = current target -> # TODO: use yowasp-nextpnr-ice40 if installed
current /= 1e6 # Hz -> MHz
target /= 1e6 # Hz -> MHz
out = subprocess.run ["icepll", "-i", str current, "-o", str target]
@ -44,7 +44,6 @@ add_domain_from_pll = platform target_freq domain:"sync" -> pll_config where
pll_config = run_icepll
default_freq
target_freq
print pll_config
pll_clk = Signal!
pll_lock = Signal!