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Diffstat (limited to 'tools/bench_main.zig')
| -rw-r--r-- | tools/bench_main.zig | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/bench_main.zig b/tools/bench_main.zig index 18b204e..973c004 100644 --- a/tools/bench_main.zig +++ b/tools/bench_main.zig @@ -961,6 +961,34 @@ fn check(port: *serial.Port, o: Options, r: *Report) !void { r.print(" and a later Peek still finds it {s}\n", .{if (still) "ok" else "FAILED"}); if (!still) failures += 1; + // 4. A PAD ACTUALLY FLIPS, AND THE FIRMWARE READS IT BACK RATHER THAN ASSUMING IT. + // + // `Gpio <pin>` crosses the whole seam this check exists for: the editor's word, the C ABI + // (`GpioFn`, which is why the ABI version is 2), the firmware's `hal.gpio` configure-and-drive, + // the pad, and the level read back out of the output register onto the message row. Nothing + // smaller exercises the ABI at all. + // + // The ORACLE IS THE ALTERNATION, not either answer alone. `0->1` on its own is what a firmware + // that printed a hardcoded string would also say; two runs reporting `0->1` then `1->0` can only + // come from a level that was stored somewhere and read again. Three runs, so the third confirms + // the second was not a coincidence of ordering. + // + // GPIO33 because `src/oracle/ledc_cases.zig` already documents it as a free pin on this board's + // JP1 header - pin 21. GPIO20 is the blink demo's pin and may have a wire on it. + var flips: [3][]const u8 = undefined; + var flip_text: [3][4096]u8 = undefined; + for (&flips, &flip_text) |*f, *dst| { + const raw = try runWord(port, &buf, "Gpio 33"); + f.* = stripAnsi(dst, raw); + } + const first_low = std.mem.indexOf(u8, flips[0], "33: 0->1") != null; + const alternates = for (flips, 0..) |f, i| { + const want = if ((i % 2 == 0) == first_low) "33: 0->1" else "33: 1->0"; + if (std.mem.indexOf(u8, f, want) == null) break false; + } else true; + r.print(" a pad flips and reads back {s}\n", .{if (alternates) "ok" else "FAILED"}); + if (!alternates) failures += 1; + // A BURST IS NOT CHECKED HERE, deliberately. The bug it would cover - input lost while the // transmitter was full - has a deterministic host test in `src/pardes/input_rescue.zig` that // loses 67 bytes with the rescue removed and needs no board at all. Every hardware oracle for it |