Brian Starkey usedbytes
usedbytes
/ find_red_blob.c
Last active
January 25, 2022 19:52
Simple routine to find the middle of the reddest blob in a YUV422 image
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| const uint8_t threshold = 10; | |
| // Search for the furthest left and furthest right pixels in 'row' | |
| // which are at least as bright as 'maxval - threshold', starting at 'start_idx' | |
| static void search_row(uint8_t *row, int len, int start_idx, uint8_t maxval, | |
| int *left_out, int *right_out) | |
| { | |
| int i; | |
| int left = start_idx; |
usedbytes
/ hub75_fm6126A.diff
Created
February 11, 2021 20:45
Quick hack to get the https://github.com/raspberrypi/pico-examples/tree/master/pio/hub75 example working with panels using FM6126A drivers
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| diff --git a/pio/hub75/hub75.c b/pio/hub75/hub75.c | |
| index 1d04b6c..2f2dd45 100644 | |
| --- a/pio/hub75/hub75.c | |
| +++ b/pio/hub75/hub75.c | |
| @@ -41,6 +41,96 @@ int main() { | |
| uint sm_data = 0; | |
| uint sm_row = 1; | |
| + { | |
| + // Quick and dirty FM6126A initialisation. |
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| $fn = 64; | |
| // =========================================================================== | |
| // Helpers and utility for calculating the d-shaft polygon | |
| function arc_points(centre = [0, 0], start = 0, angle = 180, radius = 5) = | |
| let( | |
| points = [ | |
| for (theta = [ start : sign(angle) * 360 / $fn : start + angle]) | |
| centre + [radius * cos(theta), radius * sin(theta)], |
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| Build the two apps: | |
| ``` | |
| gcc -L/opt/vc/lib -I/opt/vc/include -o p1 -l vcsm p1.c | |
| gcc -L/opt/vc/lib -I/opt/vc/include -o p2 -l vcsm p2.c | |
| ``` | |
| Run p1, then run p2 in another shell |
usedbytes
/ gist:3c1ecbef13b4ccd7f23cfd5712f0c85f
Created
October 20, 2017 22:36
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| SteamVR System Report created Fri Oct 20 23:33:13 2017 | |
| <Report> | |
| SteamVR Version: 1508466289 | |
| SteamVR Date: 2017-10-20 | |
| Steam: Public | |
| Steam Branch: beta | |
| Steam AppID: 250820 | |
| Tracking: lighthouse | |
| OS: Linux version 4.13.7-1-ARCH (builduser@tobias) (gcc version 7.2.0 (GCC)) #1 SMP PREEMPT Sat Oct 14 20:13:26 CEST 2017 |
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| /* C equivalent of the "slow in-memory" Java code from this "paper": | |
| * http://arxiv.org/pdf/1503.02678v1.pdf | |
| * Apparently it takes 274 seconds on Java6! | |
| * | |
| * $ time ./a.out | |
| * | |
| * real 0m42.023s | |
| * user 0m31.880s | |
| * sys 0m10.137s | |
| */ |