fix for casting with add #7790
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fix for casting with add #7790
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The compiler for PIC18F treated this as adding two byte types (throwing out the overflow) and then casting it to a word16 type. i.e 0xFF + 0x01 = 0x00 (where 0x100 gets thrown out) and then casted 0x00 to word16 type. Casting each to word16 first and then adding avoids this.