Full preliminary implementation of TPDO transmit type:
- SYNC (N) (1-240)
- RTR only + SYNC (252)
- RTR only (253)
- EVENT, with timer and inhibit time (254 and 255)

User app have to call sendPDOevent(d) to eventually signal mapped data changes.
Callbacks added to 0x140N, TPDO comm parameters for on the fly timers values change.
TestMasterSlave updated.

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/* 

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Define the i/o port global symbol 

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*/

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.globl _io_ports

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_io_ports=0x0000	

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/* 

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0x0000 is the default mapping at reset. (it is 0x1000 for 68hc11)

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*/

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