I need to use both serial ports on the 80c320, to realize a number of industrial controls.
I've a card on which the 320 works ok, but there is a problem. If I enable the interrupt on serial port 0, the interrupt on serial port 1 is not serviced. Note that if I disable the interrupt on serial 0, the serial 1 works ok.
It seems that serial 0 interrupt locks the serial 1 interrupt. I need to operate the ports at different baud rate, and it works, because I used timer 2 on serial 0 and timer 1 on serial 1, even if I found that timer 1 runs strange in this case, because I can't make it work well with SMOD=1 to double the baud rate. Why?
Back to interrupt problems: I tried also to increase the priority on serial 1 interrupt, but the software seems to lock.
Please note that serial 0 works well with or without serial 1 interrupt on, while serial 1 works only with serial 0 interrupt disabled, I believe that the vectoring and related procedures were ok.
I include a piece of code, to show how I managed the stuff.
What I need, now, is a source code showing both serial ports working simultaneously, at different baud rates, receiving with interrupt and trasmitting when needed.
I hope you can help me, because I must deliver the cards in a few days!
I red 80c320.pdf, AN75 and related documents you have online, without finding anything useful for my problem.
Another question: i tried to speed up the timers turning on the related bit (T0M, T1M, T2M), but it seems to have no effect.
Why?
HELP ME, PLEASE!
Maurizio Dagradi


P.S. It's sunday and I'm working on the 320, trying to solve these problems, so have mercy and help me, please!



cseg

; Boot ed interrupts. ---------------------------------------------------------
boot_org equ 0h

org boot_org ; Boot.
jmp main

org boot_org + 3 ; Interrupt su INT0.
jmp gest_int0

org boot_org + 13h ; Interrupt su INT1.
jmp gest_int1

org boot_org + 0bh ; Interrupt da timer 0.
jmp tmr0

org boot_org + 23h ; Interrupt da porta seriale.
jmp int_porta_ser

org boot_org + 3bh ; Interrupt da porta seriale 2.
jmp int_porta_ser2

; -----------------------------------------------------------------------------
; Main.

org boot_org + 100h
main:
init:
; Azzeramento ingressi, uscite, timers ecc.
clr sdo
clr sck
clr cs1
clr cs2
clr cs3
clr en_ser
mov r0, #di
init1: mov @r0, #0
inc r0
cjne r0, #0ffh, init1

mov pres_0, #vpres0 ; Setup prescalers.
mov pres_1, #vpres1

mov scon, #01000000b ; Seriale: modo 1.
mov scon1, #01000000b ; Seriale 2: modo 1.
setb ren ; Abilitazione ricezione.
setb ren1 ; Abilitazione ricezione porta seriale 2.
setb ti ; Indicazione di registro di
; trasmissione vuoto.
setb ti1 ; Indicazione di registro di
; trasmissione vuoto porta seriale 2.
mov pcon, #10000000b ; Seriale: smod = 1.
clr sm0fe1 ; Seriale 2: smod1 = 0.
mov tcon, #10000000b ; Setup timer 1.
mov tmod, #00100010b ; Timer 0 e timer 1 8-bit auto-reload.
mov th0, #-201 ; Valore reload per timer 0.
mov ie, #10000000b ; Interrupts abilitati individualmente.
setb et0 ; Interrupt su overflow timer 0.
; setb int0 ; Settaggio INT0 per gestione interrupt.
; setb it0 ; Interrupt INT0 su falling edge.
; setb ex0 ; Interrupt su INT0.
; setb int1 ; Settaggio INT1 per gestione interrupt.
; setb it1 ; Interrupt INT1 su falling edge.
; setb ex1 ; Interrupt su INT1.
; setb es ; Interrupt su porta seriale.
setb es1 ; Interrupt su porta seriale 2.
orl ip, #00000000b
mov th1, #0fah ; Valore reload per timer 1: 9600 bit/s di default.
mov rcap2h, #high(65500) ; Valore reload per timer 2: 9600 bit/s di default.
mov rcap2l, #low(65500) ; " " "
mov psw, #00000000b ; Banco registri 0.
mov sp, #BaseStack ; Stack.
setb tr0 ; Partenza timer 0 (tick interrupt).
setb tr1 ; Partenza timer 1 (generatore di baud
; rate).
setb tr2 ; Partenza timer 2 (generatore di baud
; rate).
; Timer 1 usato per COM2 (seriale 1 = RS485).
; Timer 2 usato per COM1 (seriale 0 = RS232).
setb rclk ; Timer 2 usato per ricezione su COM1.
setb tclk ; Timer 2 usato per trasmissione su COM1.
.
.
.
end



; -----------------------------------------------------------------------------
int_porta_ser:
; Gestione interrupt da porta seriale.

jnb ri, ips_reti

push psw ; Salvataggio registri.
push acc
push b
push dpl
push dph
mov psw, #00010000b ; Banco registri 2.

clr ri ; Reset interrupt in ricezione.
mov b, sbuf ; Acquisizione del carattere.
mov carser, b
setb car_pronto

mov dptr, #rx
mov r5, dph
mov r4, dpl
mov r7, #0
mov r6, irx
call addint
mov dph, r3
mov dpl, r2
mov a, carser
movx @dptr, a
inc irx
cjne a, #ret_c, ips1
setb rx_pronta
jmp ips_fine

ips1:
mov r1, #timers + Tmr8 ; Si: ricarica del timer di controllo time-out.
mov @r1, #TimeOutSer

ips_fine:
pop dph
pop dpl
pop b
pop acc ; Recupero registri.
pop psw

ips_reti:
reti

; -----------------------------------------------------------------------------
int_porta_ser2:
; Gestione interrupt da seconda porta seriale .

jnb ri1, ips2_reti

push psw ; Salvataggio registri.
push acc
push b
push dpl
push dph
mov psw, #00010000b ; Banco registri 2.

clr ri1 ; Reset interrupt in ricezione.
mov b, sbuf1 ; Acquisizione del carattere.
mov carser2, b
setb car2_pronto

mov dptr, #rx2
mov r5, dph
mov r4, dpl
mov r7, #0
mov r6, irx2
call addint
mov dph, r3
mov dpl, r2
mov a, carser2
movx @dptr, a
inc irx2
cjne a, #ret_c, ips21
setb rx2_pronta
jmp ips2_fine

ips21:
mov r1, #timers + Tmr9 ; Si: ricarica del timer di controllo time-out.
mov @r1, #TimeOutSer

ips2_fine:
pop dph
pop dpl
pop b
pop acc ; Recupero registri.
pop psw

ips2_reti:
reti