[simio] support Timer_B

[tgtakaoka]

Timer_B is identical to Timer_A with the following exceptions.

• The interrupt vector word of TBIFG is different than TAIFG one.
• The length of Timer_B is programable to be 8, 10, 12, or 16 bits.
• Timer_B TBCCRx registers are double-buffered and can be grouped.
• The SCCI bit function is not implemented in Timer_B.

[tgtakaoka]

Please have a look!

[tgtakaoka]

Please hold off on reviewing. I'm writing test code for this.

[dlbeer]

On Sun, Jul 01, 2018 at 07:16:31AM -0700, Tadashi G. Takaoka wrote:

Please hold off on reviewing. I'm writing test code for this.

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Ok, no problem -- let me know when you're ready.

-- Daniel Beer dlbeer@gmail.com http://dlbeer.co.nz/ PGP: BA6E 0B26 1F89 246C E3F3 C910 1E58 C43A 160A 553B

[tgtakaoka]

Hi, I split the original change into 6.

• Add timer test.
• Fix original simio timer to handle timer period changing.
• Fix original simio timer to handle software initiated capturing.
• Add basic Timer_B simio implementation.
• Add double buffering compare latch of Timer_B.
• Add compare latch grouping of Timer_B.

Please have a look!

[dlbeer]

Excellent, thanks very much for this!