Interrupt Driven Serial Input using DT_Ints?

[circuitpro]

The datasheet for the pic just refers to TCSTAx, and at first I was setting them up with HSER_RCSTA and HSER2_RCSTA, but out of mass frustration, thought I would see if it should really be HSER1 & HSER2. (Once again, it's logical, but wrong!)

Do you see any reason uart2 isn't working at 115k?

[Darrel Taylor]

Do you see any reason uart2 isn't working at 115k?

From a software point of view, no.
PBP does exactly the same thing with both USARTS, which looks like this ...
Blue is EUSART1.
Green is EUSART2.

000000                01183     ORG RESET_ORG               ; Reset vector at 0
000000 EF13 F000      01193         goto    INIT            ; Finish initialization
                      02343 HSEROUT CLRWDT?                 ; Keep Watchdog clear
000004 0004               M         clrwdt
000006 A89E           02344         btfss   PIR, TXIF       ; Wait till ready
000008 D7FD           02345         bra     HSEROUT
00000A 6EAD           02369         movwf   TXREG           ; Send the char
00000C 80D8           02370         bsf     STATUS, C       ; Set no timeout for Serout2mod
00000E EF10 F000      02371         goto    DUNN            ; That's it
                      02567 HSEROUT2 CLRWDT?                ; Keep Watchdog clear
000012 0004               M         clrwdt
000014 A8A4           02568         btfss   PIR3, TX2IF     ; Wait till ready
000016 D7FD           02569         bra     HSEROUT2
000018 6E6D           02593         movwf   TXREG2          ; Send the char
00001A 80D8           02594         bsf     STATUS, C       ; Set no timeout for Serout2mod
00001C EF10 F000      02595         goto    DUNN            ; That's it
000020 0100           07799 DUNN    movlb   0               ; 1 Reset banks to 0
000022 0004               M         clrwdt
000024 0012           07801         return                  ; 2 Done
000026                07815 INIT
000026 0E56               M         movlw   low (86)
000028 6EAF               M         movwf   SPBRG
00002A 0E24               M         movlw   low (24h)
00002C 6EAC               M         movwf   TXSTA
00002E 0E90               M         movlw   low (90h)
000030 6EAB               M         movwf   RCSTA
000032 0E56               M         movlw   low (86)
000034 6E6F               M         movwf   SPBRG2
000036 0E24               M         movlw   low (24h)
000038 6E6C               M         movwf   TXSTA2
00003A 0E90               M         movlw   low (90h)
00003C 6E6B               M         movwf   RCSTA2
00003E                07852 main
00003E 6A7F               M         clrf    SPBRGH1
000040 867E               M         bsf     BAUDCON1, 003h
000042 6A7D               M         clrf    SPBRGH2
000044 867C               M         bsf     BAUDCON2, 003h
000046 0E00               M         movlw   000h
000048 DFDD               M         rcall   HSEROUT
00004A 0E00               M         movlw   000h
00004C DFE2               M         rcall   HSEROUT2

Which leaves hardware.
Something with the 18F6722? (doubtfull). Nothing in the errata sheet.
Extra capacitance on the PCB or serial cable. Bad cable?
<strike>Not enough capacitance on the MAX232?</strike> OOPS, RS422/RS485 ... no MAX232

Hard to tell.

[circuitpro]

That's very helpful - Thanks! It's going directly to a 75ALS180 (RS485), and the signal looks good on a scope, so I'll do some more testing - focusing on hardware now.