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# Debugging Menu
In this firmware there is extra debugging information hidden under an extra menu.
This is accessed by holding the rear (B) button on the iron while it is on the home screen.
This menu is meant to be simple, so it has no fancy GUI animations.
To move through the menu use the front (A) button.
To exit, use the rear (B) button again.
## Menu items
Items are shown in the menu on a single line, so they use short codes
### HW G
This indicates the High Water mark for the stack for the GUI thread. The smaller this number is, the less headroom we have in the stack.
As this is a Highwater mater, you should only trust this once you have walked through all GUI options to "hit" the worst one.
### HW M
This indicates the High Water mark for the stack for the movement detection thread. The smaller this number is, the less headroom we have in the stack.
### HW P
This indicates the High Water mark for the stack for the PID thread. The smaller this number is, the less headroom we have in the stack.
### Time
This just shows how many deciseconds the unit has been powered for.
### Move
This is the last timestamp of movement. When the iron is moved this should update to match the Time field (one before in the menu).
This can be used for checking performance of the movement dection code.
### RTip
This is the raw tip reading in uV. This can be used when assessing the calibration routines for example.
### CTip
This is the tip temperature in deg C.
This can be used with RTip for assessing temperature processing performance.
### CHan
This is the handle temperature in C. This is used for cold junction compensation of the tip temp.
This is shown in degrees C x10, so 200 == 20.0C
### Vin
The input voltage as read by the internal ADC. Can be used to sanity check its being read correctly.
### ACC
This indicates the accelerometer that is fitted inside the unit.
- MMA8652
- LIS2DH12
- BMA223
- MSA301
- SC7A20
- None detected -> running in fallback without movement detection
- Scanning -> Still searching I2C for one
### PWR
This indicates the current power source for the iron.
This may change during power up as the sources are negotiated in turn.
- 0 = DC input (dumb)
- 1 = QC input (We used QC2/3 negotiation for current supply)
- 2 = PD input (We used the PD subsystem to negotiate for the current supply)
### Max
This indicates the max temp in C that the system estimates it can measure the tip reliably to.
This is dependant on a few factors including the handle temperature so it can move around during use.
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