Improving platform independence

[pbuteau]

No description provided.

[jxwleong]

Hi Patrice,
Do you mind add in some description on the PR? 😊

Thanks,
Jason

[pbuteau]

4 small changes:

1. DISVAL: DISVAL can be found in the BSDL file. It varies depending on the device and corresponds to the values used in the BSCPinMode enum.
2. bSCInIt: bSCInIt is now initializing the whole bSCellPreloadData and bSCellSampleData arrays. This has no impact if the number of boundary scan cells is a factor of 8 (like in this case), but will have an impact otherwise.
3. Getting rid (or not) of the bypass bit for the CORTEX M3 TAP using a for loop: This makes the code work in the case where you only have 1 TAP, while still supporting the stm32 case where there are 2 TAPS. Important note: This won't work in every other cases, as the code would require a certain prior knowledge of your jtag chain.
4. Removed the CORTEX_M3_BOUNDARY_SCAN_CELL_LENGTH define duplicate in BoundaryScan.h