Instant Interrupts - Revisited

[nacho7577]

Hi, all. In my program i put all you are saying about fast interrupts, and with INT_INT, works fine, and so better than it use with on interrupt goto..... I´ve probed also with TIMR0 at same time and works again. But if i put RX_INT, others work but RX_INT subrutine nothing happens.

I delete all about INT_INT and TIMR0, and works. In RX_INT sub only have a sentence like HSERIN char, and in main program LCDOUT char to see the incoming char.

Any ideas? I copied the code of first page to make it, and it should be work.

Another question: If i want to save that char in a string to display it in the lcd, when carriage return income, how can i do it??? My head it´s warm....... sorry.

Also i´ve read the post about string of Darrel but i´m newby and i don´t undestand so much.

Thanks for all.

PD.- micro it´s 16F877A or 16F876, or 16F84

[skimask]

But if i put RX_INT, others work but RX_INT subrutine nothing happens.

Are you sure that you're receiving anything in the first place?
How about clearing RCIF?

In RX_INT sub only have a sentence like HSERIN char, and in main program LCDOUT char to see the incoming char.

Are you using HSERIN or the RX_INT?

Another question: If i want to save that char in a string to display it in the lcd, when carriage return income, how can i do it??? My head it´s warm....... sorry

Another thread subject...make an array, make a counter, keep adding 1 to the counter, store the character in the array with the index 'counter', if the incoming character is a CR, display it, otherwise, wait for more...again, should be a seperate thread.

[nacho7577]

' PROGRAMA QUE USA INTERRUPCIONES INSTANTÁNEAS '
' INT_INT -- INT External Interrupt
' RBC_INT -- RB Port Change Interrupt
' TMR0_INT -- TMR0 Overflow Interrupt 16F
' TMR1_INT -- TMR1 Overflow Interrupt
' TMR2_INT -- TMR2 to PR2 Match Interrupt
' TX_INT -- USART Transmit Interrupt
' RX_INT -- USART Receive Interrupt
' CMP_INT -- Comparator Interrupt
' EE_INT -- EEPROM/FLASH Write Operation Interrupt
' BUS_INT -- Bus Collision Interrupt
' PSP_INT -- Parallel Slave Port Read/Write Interrupt
' AD_INT -- A/D Converter Interrupt
' SSP_INT -- Master Synchronous Serial Port Interrupt
' CCP1_INT -- CCP1 Interrupt
' CCP2_INT -- CCP2 Interrupt

clear

define OSC 16

' Define LCD connections
DEFINE LCD_DREG PORTD ' LCD Data Port
DEFINE LCD_DBIT 4 ' Starting Data Bit
DEFINE LCD_RSREG PORTD ' Register Select Port
DEFINE LCD_RSBIT 2 ' Register Select Bit
DEFINE LCD_EREG PORTD ' Enable Port
DEFINE LCD_EBIT 3 ' Enable Bit
DEFINE LCD_BITS 4 ' Data Bus Size
DEFINE LCD_LINES 2 ' Number of Lines on LCD

' Define RS232 line
DEFINE HSER_BAUD 19200 'Hser baud rate
DEFINE HSER_CLROERR 1 'Hser clear overflow automatically
DEFINE HSER_SPBRG 51 'Hser spbrg init
DEFINE HSER_RCSTA 90h 'Hser receive status init
DEFINE HSER_TXSTA 24h 'Hser transmit status init

ADCON1 = 7 'Set portA outputs to Digital / No ADC
LCDOUT $FE,1 ' Initialize LCD
PAUSE 200

fase_a var portb.0
subir var portb.1
bajar var portb.2
prog var portb.3

salida var porta.0
'sentido var porta.1
'prueba var porta.2

aux_subir var ppp.0
aux_bajar var ppp.1
aux var ppp.2
escribir_inicio var ppp.3
escribir_pulso var ppp.4

ppp var byte
cuenta var word
pulso var word
inicio var word
que_escribir var word
aux_aux var byte
tmp var byte
direccion var byte
char var byte
cadena var byte[20]
i var byte

INCLUDE "DT_INTS-14.bas" ' Required
INCLUDE "ReEnterPBP.bas" ' Include if using PBP interrupts
INCLUDE "Elapsed_INT.bas" ' Elapsed Timer Routines

TRISA = 0
PORTA = 0
TRISB = $FF
TRISC = %10000000
TRISD = 0
PORTD = 0
PORTC = 0

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler INT_INT, _Int_RB0, PBP, yes
INT_Handler RX_INT, _Int_RX, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor

INT_ENABLE INT_INT ; enable external (INT) interrupts
INT_ENABLE RX_INT ;

ENDASM

OPTION_REG = OPTION_REG & $80 | 1 ; Set TMR0 Prescaler to 256, leave RBPU alone

Main:
i = 0
cuenta = 0
aux_aux = 0
inicio = 300
pulso = 300
'Reinicializar variables
if subir and bajar then
escribir_inicio = 1
gosub escribir
escribir_inicio = 0
escribir_pulso = 1
gosub escribir
escribir_pulso = 0
endif

'Si no hay nada en eeprom graba variables
read $0,tmp
if tmp = $FF then
escribir_inicio = 1
gosub escribir
escribir_inicio = 0
escribir_pulso = 1
gosub escribir
escribir_pulso = 0
endif

'Se releen las variables
gosub leer

prog_: 'lazo principal

if subir and prog and not aux_subir then
gosub mod_inicio_subir
endif

if bajar and prog and not aux_bajar then
gosub mod_inicio_bajar
endif

if subir and not prog and not aux_subir then
gosub mod_pulso_subir
endif

if bajar and not prog and not aux_bajar then
gosub mod_pulso_bajar
endif

if not subir then
aux_subir = 0
endif

if not bajar then
aux_bajar = 0
endif
'salida por LCD
lcdout $fe,2
lcdout "Posicion ",dec4(cuenta)
lcdout $fe,$C0
lcdout "Inicio ",dec4(inicio)
lcdout $fe,$94
lcdout "Pulso ",dec4(pulso)
lcdout $fe,$d4
cadena[I] = char
LCDOUT STR cadena,20 'no aparece nada (nothing appears in lcd
' lcdout "Salida ",bin salida
goto prog_

'Subrutinas
leer:
INTCON = $00
read $0,inicio.byte1
Read $1,inicio.byte0
read $2,pulso.byte1
Read $3,pulso.byte0
INTCON = $90
RETURN

escribir:
if escribir_inicio = 1 then
que_escribir = inicio
direccion = $0
endif

if escribir_pulso = 1 then
que_escribir = pulso
direccion = $2
endif

' porta.2 = 1 'chequeo para saber que ha escrito en eeprom
Write direccion,(que_escribir.byte1)
write direccion+1,(que_escribir.byte0)
porta.2 = 0
return

mod_inicio_subir:
inicio = inicio + 15
aux_subir = 1
if inicio >= 3000 then
inicio = 3000
endif
escribir_inicio = 1
gosub escribir
escribir_inicio = 0
return

mod_inicio_bajar:
inicio = inicio - 15
aux_bajar = 1
if inicio <= 50 then
inicio = 50
endif
escribir_inicio = 1
gosub escribir
escribir_inicio = 0
return

mod_pulso_subir:
pulso = pulso + 15
aux_subir = 1
if pulso >= 3000 then
pulso = 3000
endif
escribir_pulso = 1
gosub escribir
escribir_pulso = 0
return

mod_pulso_bajar:
pulso = pulso - 15
aux_bajar = 1
if pulso <= 50 then
pulso = 50
endif
escribir_pulso = 1
gosub escribir
escribir_pulso = 0
return

'---[INT - interrupt handler]---------------------------------------------------
Int_RB0:
cuenta = cuenta + 1

if cuenta >= inicio then
salida = 1
endif

if cuenta >= (pulso + inicio) then
salida = 0
cuenta = 0
endif
@ INT_RETURN

'---[TMR0 - interrupt handler]-------------------------------(Blinky Light)-----
'T0Count Var WORD
'ToggleLED2: 'aprox 1 segundo
' T0Count = T0Count + 1
' if T0Count = 512 then T0Count = 0 : Toggle LED2
'@ INT_RETURN

'---[RX - inmterrupt handler]--------------------------------------------------
Int_RX:
PORTA.1 = 1 'to check RX int has come
i = i +1
hserin [char]
@ INT_RETURN

------------------------
questions:

Why LCD doesn´t display cadena?
Why when i entry many chars by rs232 (fast) variables inicio and pulso corrupts and display an abnormal value?? This check was made without int_int interrupts (fase_a it´s an output from a incremental encoder, and this one was stopped).

Thanx, and sorry if i´m 'heavy'.

[Darrel Taylor]

I don't understand your language, so it's hard to tell what's going on.
But here's a couple problems I can see...

LCDOUT STR cadena,20 'no aparece nada (nothing appears in lcd

should be...

LCDOUT STR cadena\20

And the reason you're missing characters, is probably because the data is received by the interrupt handler, but it's being put into the "buffer" array in the main loop. That should be done in the handler too.
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[nacho7577]

Thanx for your answer.

I understand you about the understanding the code.... me too sometimes....

OK lcdout cadena\20

>And the reason you're missing characters, is probably because the data is >received by the interrupt handler, but it's being put into the "buffer" array in >the main loop. That should be done in the handler too.
¿? Something like this?:

'---[RX - inmterrupt handler]----------------------------------------------
Int_RX:
PORTA.1 = 1 'to check RX int has come
hserin [char]
cadena[i] )= char
i = i +1
@ INT_RETURN

but lcd displays rare....

Don´t worry i´ll figth with it.

Thanx for all.

[Darrel Taylor]

Better, but it still needs a way to limit it to the "bounds" of the array. Or, it will overwrite all your other variables. Maybe like this.

'---[RX - inmterrupt handler]----------------------------------------------
Int_RX:
    PORTA.1 = 1 'to check RX int has come 
    hserin [cadena(i)] 
    i = i +1
    if i >= 20 then i = 0
@ INT_RETURN

Of course this still has the problems of not knowing how many bytes were received, if the buffer overflows, if USART errored etc.

You might want to take a look at this program from Joe S.

LCD serial backpacks
http://www.picbasic.co.uk/forum/showthread.php?p=28336

It has a complete "Circular Buffer" using DT_INTS.
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