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Revamp usrsw to use new exti code.
Add user switch callback function.
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This also fixes up the IRQ for the PYBOARD4 USERSW
although I was unable to test that functionality.
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Using PendSV interrupt at lowest priority, code can now raise an
exception during an interrupt by calling pendsv_nlr_jump. The exception
will be raised when all interrupts are finished. This is used to trap
ctrl-C from the USB VCP to break out of running Python code.
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f2d and d2f functions from libgcc does not work correctly, most likely
due to the ABI being incorrect. libgcc disabled for now.
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Can now have null bytes in strings. Can define ROM qstrs per port using
qstrdefsport.h
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See pyb_usart_global_debug variable.
Also did some work on USB OTG, but nothing working yet.
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* Add a TARGET definition to Makefile (default PYBOARD).
* Add support for discovery LEDs in led module.
* Add support for discovery user switch in usersw
* Add EXTI interrupt handler for discovery user switch on (PA0).
* Parameterize led and usrsw modules pins and port.
* Issue #83
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A big change. Micro Python objects are allocated as individual structs
with the first element being a pointer to the type information (which
is itself an object). This scheme follows CPython. Much more flexible,
not necessarily slower, uses same heap memory, and can allocate objects
statically.
Also change name prefix, from py_ to mp_ (mp for Micro Python).
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