138 lines
6.5 KiB
C++
138 lines
6.5 KiB
C++
#pragma once
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#include <string>
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namespace fgc {
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// The decisions behind `test hardware`, separated from the I/O that feeds them.
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//
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// Each function takes what was read - a sysfs string, an ioctl bitmask, a DUMP
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// echo - and returns a verdict with the sentence an operator needs. Keeping them
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// pure is what lets the thresholds be tested without a rig, which matters because
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// several of them encode traps that cost real debugging time (known-issues #2
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// and #19) and must not drift silently.
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struct CheckResult {
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bool ran = true; // false => nothing was declared, so nothing was checked
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bool pass = true;
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std::string detail; // one line; names the fix when it failed
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};
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// /sys/module/usbcore/parameters/usbfs_memory_mb.
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//
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// Reverts to 16 on every reboot unless persisted on the kernel cmdline, and
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// frame delivery stalls below ~1000 regardless of application code
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// (known-issues #19). A value that will not parse is a failure, not a pass:
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// an unreadable node means the check did not happen.
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CheckResult checkUsbfsMemory(const std::string& sysfs_value, int min_mb);
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// A usb3_lpm_permit node. U1/U2 link power management must be OFF on the
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// camera's port or the camera logs frame drops under load; the per-device
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// usb3_hardware_lpm_u* files are read-only, so this port-level node is the one
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// that can actually be set (known-issues #19).
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CheckResult checkUsb3Lpm(const std::string& permit_value);
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// The I2C_FUNCS ioctl bitmask for the bus the SHT41 is on.
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//
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// An SMBus-only adapter opens, binds its slave address, and then fails every
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// transaction - which reads as a dead sensor rather than as the wrong bus
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// (known-issues #2). `i2cdetect -F <n>` is the manual form of this check.
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//
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// The bit is spelled out rather than pulled from <linux/i2c.h> so this stays a
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// pure module: I2C_FUNC_I2C is 0x00000001 and is ABI-stable.
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constexpr unsigned long kI2cFuncI2c = 0x00000001UL;
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CheckResult checkI2cFunctionality(unsigned long funcs);
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// What the host computed from hardware.ini for one axis.
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struct DrivetrainExpectation {
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bool declared = false; // hardware.ini carries a current for this axis
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int global_scaler = 0;
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int run_irun = 0;
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int homing_irun = 0;
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};
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// One value the host declared and the firmware should be holding. Used for the
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// parameters the config handshake added, where "not declared" and "not echoed"
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// both mean the check does not apply rather than that it failed.
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struct DeclaredValue {
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const char* name = "";
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bool want = false; // hardware.ini declares it
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long value = 0;
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long got = -1; // as DUMP echoed it; -1 = absent
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};
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// Does the firmware hold what hardware.ini says? This is the generalisation of
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// the old "did CENTER land?" check: with the drivetrain owned by the host, every
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// declared value is one the firmware can be silently wrong about, and a tower
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// running on stale or defaulted values looks identical to a correct one from the
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// outside.
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//
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// `values` may be empty, which is how an axis with nothing declared reports
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// "not checked" rather than passing.
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CheckResult checkDeclaredValues(const std::string& axis, const DeclaredValue* values, int count);
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// What DUMP echoed back. -1 means the field was absent, which is a firmware
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// predating the CURRENT command - a version skew, not a current of zero, and
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// the two must stay distinguishable.
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struct DrivetrainEcho {
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long global_scaler = -1;
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long run_irun = -1;
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long homing_irun = -1;
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bool absent() const { return global_scaler < 0 && run_irun < 0 && homing_irun < 0; }
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};
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// Did the firmware adopt what the host sent? Both registers are write-only on
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// the TMC5160, so this echo is the only confirmation available - and without it
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// a tower can run its whole life on limp-home defaults while reporting healthy.
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CheckResult checkDrivetrainAdopted(const std::string& axis, const DrivetrainExpectation& want,
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const DrivetrainEcho& got);
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// Is the axis running the host's configuration, or the firmware's limp-home
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// fallback?
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//
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// `USE DEFAULTS` is the deliberate bench escape from NEEDCFG, and it fills the
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// firmware's cfg_rx mask completely - so an axis on limp-home values reports as
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// fully configured and passes every state check. What gives it away is the DUMP
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// `limp` flag, which says where the values came from rather than whether they
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// arrived.
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//
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// checkDeclaredValues() would also catch this, but only as a list of mismatched
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// numbers, which reads as "the host and firmware disagree" and sends someone to
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// re-send them. The truthful diagnosis is that nobody ever sent any.
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//
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// `limp` < 0 means the firmware predates the flag: reported as not-run, because
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// an old firmware is a version skew rather than a misconfigured tower.
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CheckResult checkNotLimpHome(const std::string& axis, long limp);
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// Is the running firmware built from the wiring hardware.ini declares?
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//
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// Pins are not sent over the wire: firmware/tools/gen_wiring.py compiles them in
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// from the tower's hardware.ini [Pins]. So a mismatch never means a lost SET -
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// it means the image was built from a different copy of that file, and the fix
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// is to rebuild and re-flash. The firmware drives whatever pins it was built
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// with, which on a tower wired differently means a chip-select into a driver
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// that was never meant to hear it.
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//
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// Same shape as checkDeclaredValues: `want` false = not declared, `got` -1 =
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// not echoed, i.e. a firmware predating the pin echo.
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CheckResult checkPinsBuilt(const std::string& label, const DeclaredValue* values, int count);
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// Does the homed travel fit entirely in positive counts?
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//
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// `center_count` defines where the middle of the found travel sits, so the range
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// is center +/- half the travel. A center smaller than half the travel puts the
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// negative end below zero. The 500000 default was sized for the Delta, whose
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// half-travel is ~89k; a drivetrain geared up by 7x has ~605k and crosses zero.
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//
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// Whether the TMC5160 actually misbehaves there is NOT established - XACTUAL is
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// a signed 32-bit register and the firmware round-trips the sign correctly - but
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// homing is the only thing that has ever driven that far, so the region is
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// untested in normal operation. The cheap fix is to not be there.
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//
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// `center` and `half_travel` are in counts. A non-positive half_travel means the
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// axis has not homed, and nothing is checked.
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CheckResult checkTravelFitsPositive(const std::string& axis, long center, long half_travel);
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} // namespace fgc
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