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

ExperimenterUK
Sun Mar 01 2015, 07:06 AM
@Anupam Biswas..post all you have done in the GSM forum
Sat Feb 28 2015, 02:51 PM
Anupam Biswas
I am doinga project on gsm based home automation.I have done alittle study about at commands.I am using Atmel 89c51 with yhe gsm module.I am unable to receive any message via the module.The simulation is done on proteus and i am using a virtual terminal.Can anyone please help me?Thanks in advance.
Tue Feb 24 2015, 12:47 AM
MrCurious
is Stat a global variable too? you reference it in Chan's "disk_status" function.
Sat Feb 21 2015, 09:10 PM
Harikumar
കൊള്ളാം
ExperimenterUK
Fri Feb 20 2015, 06:28 AM
@sugikz.. I have asked Ajay about it, he'll soon sort it out
Thu Feb 19 2015, 12:22 PM
sugikz
"Sorry no bots allowed! You entered two different email addresses. Please enter a valid email address in the two fields provided"
Thu Feb 19 2015, 12:21 PM
sugikz
this are the problem notice box;
Thu Feb 19 2015, 12:20 PM
sugikz
yes, i still got stuck on email problem, i've used gmail, yahoo, and told some friends of mine to sign up on the site, but they face the same problem as iam,
Thu Feb 19 2015, 05:48 AM
sjeeva
hi, is any doing a project on raspberry pi
Thu Feb 19 2015, 05:48 AM
sjeeva
hi

Downloads

Comments

MALIKATIF
Mon Mar 02 2015, 04:47 PM
raamchandran
Mon Mar 02 2015, 11:20 AM
ABiDAEV
Sat Feb 28 2015, 11:31 PM
arunkollam
Wed Feb 25 2015, 05:28 AM
sugikz11
Wed Feb 25 2015, 04:23 AM
Buhari
Sun Feb 22 2015, 03:16 PM
Jarvis_v3
Sat Feb 21 2015, 02:00 AM
Sontoloyo
Thu Feb 19 2015, 12:50 PM

Online

Guests: 46, Members: 0 ...

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

Members: 37591
Newest member: MALIKATIF
Forum Activity
ABiDAEV Avatar
Posted By ABiDAEV
Sun Mar 01 2015, 11:42 AM
Thanks for sharing, but can you please update the ...
sankalp_s Avatar
Posted By sankalp_s
Thu Feb 26 2015, 09:27 PM
What are you trying to make ?ExperimenterUKsir i w...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Feb 26 2015, 12:58 AM
We seem to be moving away from the original projec...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Feb 25 2015, 02:02 PM
You will need a 64 bytes buffer that will be writt...
PsySc0rpi0n Avatar
Posted By PsySc0rpi0n
Wed Feb 25 2015, 09:24 AM
I've already read that tutorial and almost all oth...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Feb 25 2015, 04:56 AM
brightness control is going to be tough job as you...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Feb 25 2015, 04:36 AM
I've already read that tutorial and almost all oth...
sankalp_s Avatar
Posted By sankalp_s
Tue Feb 24 2015, 07:18 PM
The attached code is for up to 16 LEDs.Just point ...
sankalp_s Avatar
Posted By sankalp_s
Tue Feb 24 2015, 07:16 PM
sankalp_s Avatar
Posted By sankalp_s
Tue Feb 24 2015, 07:12 PM