Fix PTT for CX and CX II #271
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Confirmed to work on emulated CX |
The On button on Touchpad and CX/CX II keypads is not connected to the keypad controller but the PMU, so its state is not visible in the keypad data and it does not generate a keypad interrupt. On the CX II it does not generate a PMU interrupt either, at least not unconditionally.
With this, it's possible to turn the calculator back on after it went into sleep mode (idle timeout or explicitly turned off). What happens when pressing On is that the calc starts from bootrom again, but that finds fastboot data in the 90030000 area left by the OS and uses that to validate some state and jumps back to the OS code in SDRAM. Add a TODO entry to improve fastboot data handling. Currently the data is preserved across restarts, which means that some possibly incompatible bootrom tries to interpret it. So far the validation detects that SDRAM was cleared and aborts.
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The On button has different behaviour. On the CX II, sleep mode had to be implemented to even allow turning it off and on.