Discussion in "ARM Development" started by    bonois_dailleurs    Aug 22, 2010.
Sun Aug 22 2010, 12:56 AM
#1
hi
i'm performing programs for lpc2378 with arm7TDMI , and i'm using timer0 interrupt
my IDE is keil microvision4

here is my code

#include <LPC23xx.H>
#include <stdio.h>





void isr_T0()__attribute__((interrupt("irq")))
{
FIO2SET |= 0x3;
VICVectAddr0 = 0 ;
T0IR = 0x1 ;
}

void init_T0()
{

T0TCR = 0;
T0MR0 = 1500 ;
T0MCR = 0x3 ;
FIO2DIR = 0x3 ;
FIO2MASK = 0xFF ;
VICIntEnable = 0x00000010 ;

VICVectAddr4 = (int)isr_T0 ;
}

void main()
{
init_T0() ;
T0TCR = 0x1 ;

while(1) {}
}

as you can notice i'm trying to set P2.0 and P2.1 , thing that never happens while simulating
i don't know anymore about this trouble , which makes me mad because it does'nt let me step foreward
if someone knows anymore about the probleme , please answer me
Mon Aug 23 2010, 11:36 AM
#2
keil follows a different coding style than ARM-GCC

so you have to write
void isr_T0()__attribute__((interrupt("irq")))

as

void isr_T0() __irq

and try again. i doubt why you did not get any error when building.
Tue Aug 24 2010, 08:56 PM
#3
i've tried both :
void ir_T0()__irq and void isr_T0__attribute__((interrupt'"irq")))
while debugging i've ckecked up in periphrals the state of all registers ,
for every time , the case (interrupt on MR0) is ticked , and T0IR took OXO1
but the leds 'P2.0 , p2.1' are never set to 1
so i'm asking my self a lot of questions , what am i doing ????
i can't really see a true interrupt , so i can't go foreward !!!
so if you know anymore about my trouble , pleae tell me

thank you in advance
Wed Aug 25 2010, 05:03 PM
#4
well you forgot to configure those pins as o/p

do it by setting direction on FIO2DIR.

FIO2DIR |= 0x03;
Thu Aug 26 2010, 09:59 AM
#5
i've already set pins as output by writing : FIO2DIR = 0x3 ; or even
FIO2DIR |= 0x03 ;
still the same trouble !!!
is it because i'm using an evaluation softaware downloaded from KEIL.com ??
other request have you ever written a programme including interrupts in which you saw your routine performing what did you tell it to do ??
if yes , can you give me this exemple ??

and thank you for helping me
Thu Aug 26 2010, 06:07 PM
#6
here is a small example for toggling P2.0

#include <LPC23xx.H>
#define INT_TMR0	4

void T0ISR() __irq {
	T0IR = 0x01;

	if(FIO2PIN & 0x01){
		FIO2CLR |= 0x1;
	} else
		FIO2SET |= 0x01;

	VICVectAddr = 0;
}

static void InitTimer(void){
	T0TCR = 0x02;
	T0MR0 = 0x1000;
	T0MCR = 0x03;
	
	VICVectAddr4 = (unsigned long)T0ISR;
	VICVectPriority4 = 0;
	VICIntEnable = 1 << INT_TMR0;

	T0TCR = 0x01;
}

int main (){
	FIO2DIR = 0x01;
	InitTimer();
	while(1);
}
Tags LPC23xx timer exampleLPC2378 timer0 code example
Sat Aug 28 2010, 12:28 AM
#7
even in this exemple , it doesn'e enter the isr at all
i've tried to initialise FIO2PIN |= 0x1 but without any success
i've looked into the step by step mode when debugging
may be i could find out what's the matter
and by following the arrow which indicate which part of the program is being executed , i've seen that it didn't move to isr at all so i guessed there is a problem somewhere
here is all suppositions that i've tried :
*)enabling first and then giving the adress to the interrupt vector (VICVectAddr)
*)looping just with the function init_TIMER() , because timer initialisations don't change and all the action is performed by the isr
i mean it's enabled , setting pin , disabled (loop )
*)i've notices that the case of "interrupt on MR0" is always ticked and T0IR always takes one

for conclusion i think that my programme is not correctly built and there is some detail that i can't find out and which making me just turning around

other thing i would like to thank you for helping me !!

of course if you got a solution please tell me
Sat Aug 28 2010, 07:59 PM
#8
The code i posted is checked and working..

if you are using a simulator you can simply put a breakpoint and see for yourself.

I am really not sure what exactly are you doing when testing the code i provided. Timer is configured for interrupt and reset on match, which is working fine.
Sat Aug 28 2010, 10:31 PM
#9
which IDE do you use
concerning me i'm using KEIL microvision 4 "evaluation software", downloaded from keil.com
did you try your programme on your software and did it work ??

i have always LINUX ubuntu , and i know that we can work with arm-gcc
but i dont' know if we can simulate to see the result

may be i should use another IDE just to be sure that i'm not loosing my time

thank you in advance
Mon Aug 30 2010, 09:30 PM
#10
I wrote this code for Keil uVision 4. I am attaching complete project here for your reference. check it.




also adding a screenshot from debug.

Get Social

Information

Powered by e107 Forum System

Conversation

Sun Oct 13 2019, 02:02 AM
Aline Hutchinson
Hey there,
ExperimenterUK
Sat Oct 12 2019, 10:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 10:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 04:33 PM
Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 12:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 06:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

Downloads

Comments

Sat Oct 05 2019, 02:38 PM
zexalo
Thu Oct 03 2019, 09:53 AM
thanhle12345
Thu Oct 03 2019, 07:37 AM
ramon_vsc
Fri Sep 20 2019, 04:53 PM
youssoufba
Thu Sep 19 2019, 11:57 AM
Taiphan000
Tue Sep 17 2019, 04:21 AM
mawantha
Fri Sep 13 2019, 10:42 AM
jonelily954
Mon Sep 02 2019, 12:34 PM

Online

Guests: 55, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 38095
Newest member: [email protected]
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Sun Oct 13 2019, 06:10 PM
This code does some scrolling.You will need to fin...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Oct 12 2019, 10:19 PM
This code does not scroll, that will be complicate...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Sat Oct 12 2019, 06:44 AM
Sir, Please share code, i m unable to scroll messa...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Oct 12 2019, 02:45 AM
Okay I got it !Data is not automatically passed on...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Fri Oct 11 2019, 05:36 AM
please find below attachment. Att...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Oct 11 2019, 02:33 AM
You seem to be 95% of the way there.Can you post y...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Thu Oct 10 2019, 07:49 AM
sir, i m trying to scroll message on dot matrix di...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Oct 10 2019, 01:31 AM
max 7219 dout pin not giving serial out data.Try t...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 09 2019, 08:48 AM
Dear sirall dot matrix display scroll same data.
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 09 2019, 08:46 AM
please find below attachment of circuit diagram. ...