Just one little point

         movlw   d_lo            ;put duty cycle bits 1-0
         swapf   wreg
         iorwf   ccp1con         ;into bits 5-4 of CCP1CON

will not put the bits into 'fresh' locations

         movlw b'11001111'
         andwf ccp1con

clears ccp1con <5:4> before including the duty cycle bits as above

wbr

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