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Hi Please Help me out for interrupts on LPC3250. How to enable interrupt handler.my program like below
TIMCLK_CTRL1|=0x08; // Enable timer clock T1CTCR = 0x00; //use as a timer T1TCR =0x01; // enable timer T1MCR =0x00000018; // match reg 1 T1MR1 =0x00000000; // reset and Interrupt
And in LPC32x0.s the interrupt handler enabled like this
;PRESERVE8 {FALSE} IMPORT IRQ_Handler Reset_Addr DCD Reset_Handler Undef_Addr DCD Undef_Handler SWI_Addr DCD SWI_Handler PAbt_Addr DCD PAbt_Handler DAbt_Addr DCD DAbt_Handler DCD 0 ; Reserved Address IRQ_Addr DCD IRQ_Handler FIQ_Addr DCD FIQ_Handler Undef_Handler B Undef_Handler SWI_Handler B SWI_Handler PAbt_Handler B PAbt_Handler DAbt_Handler B DAbt_Handler ;IRQ_Handler B IRQ_Handler FIQ_Handler B FIQ_Handler
My interrupt routine as below
void IRQ_Handler(void)__irq { send_data('D'); // for uart5 P2_OUTP_CLR|=0x00001820; // checking for led glow if((MIC_SR&0x00020000)==0x00020000) { send_data('C'); T1IR |=0x01; // T1 Interrupt //timer1(); } return; }
program does not entering into IRQ_Handler Please Help me out. Thanks in advance.
You need to configure the interrupt controller.
Here's a starting point for you:
MIC_APR &= ~(1<<17); // Activation Polarity MIC_ATR &= ~(1<<17); // Activation Type MIC_ITR &= ~(1<<17); // Interrupt Type (IRQ) MIC_ER |= (1<<17); // Enable register
Refer to chapter 5 of the LPC3250 user manual for further details.
Thanks for reply. This is the way i used in the program. MIC_APR |= 0x00020000; MIC_ATR &=~0x00020000; // Timer 1 Edge interrupt MIC_ITR &=~0x00020000; // IRQ interrupt MIC_ER |= 0x00020000;
we Tested timers without interrupt at match pins successfully. Now, for the interrupt Is my Procedure to enable the interrupts was right?
It says in the manual that the interrupt is active low. This is why I included the line:
MIC_APR &= ~(1<<17); // Activation Polarity
or, in your form it would be:
MIC_APR &= ~0x00020000;
Yes,In User manual it is low. i changed the value now. but still not getting interrupt.Please advice. Thank you
It would be sensible to initialise T1PR.
I do not know what effect there would be to setting MR1 to zero. This register contains the match of count; i.e., the frequency of interrupts.
If PCLK is set to (the typical) 13MHz, then the following would be suitable for a periodic 5ms interrupt:
T1PR = 1-1; // PCLK/1 T1MR0 = 65000-1; // 5ms/(1/13MHz)
Yes.i'm getting 5ms as per this values. But help me with interrupt. i studied the data sheet. there is no support about "How to use Interrupt Handler". by following some examples and Datasheet i written the below logic.
Is this correct? If it is correct that 'D' must be print on serial port. Please tell me about this IRQ handler enable.
The most important requirement of the ISR is to release/acknowledge the interrupt so you can get another one; as:
T1IR = 1; // Clear/Acknowledge the interrupt request
You can put anything else into the function that you want.
I can't advise you on the use send_data function nor your use of P2 because that would be specific to your hardware and code of your project.
It is typical on the LPC3250 to have a single interrupt entry point that determines the source of the interrupt and calls (or jumps to) the appropriate code, such as:
void __irq IRQ_Handler(void) { if ((MIC_SR&0x00020000)!=0) { Irq_Timer1(); } else if (MIC_SR&0x00040000)!=0) { Irq_Other(); } }
"Please tell me about this IRQ handler enable."
I've given you some sample code and a reference to the relevant section of the manual.
If you want other information, please be more precise.
I'm trying with this but i was unable to generate interrupt. Is there any changes have to made on .s file to enable IRQ_Handler? And i'm using Keil micro vision 3 compiler.
The only change you need to make for IRQ_Handler is in the startup, which you have done. I gave you code to initialise the interrupt controller and timer.
If your project is very small, then maybe you should consider posting more of the code so we can get a better idea about what you're doing (and what you might be doing wrong).
Project is very big and confidential also. But i need support. i'm sending the program which i'm testing. C File
#include"LPC325x.h" //void Init_INTERRUPT(void); void uart5_init(void); void send_data(unsigned char ch); unsigned char receive_data (void); //void timer1Handler(void) __irq; void Irq_Other (void); void Irq_Timer1(void); main() { P2_MUX_SET|=0x00000008; P2_DIR_SET|=0x00001820; P_MUX_SET |=0x8000; LCD_CTRL=0x00000000; uart5_init(); send_data('H'); TIMCLK_CTRL1|=0x08; // Enable timer clock T1CTCR = 0x00; //use as a timer T1TCR =0x01; // enable timer T1MCR =0x00000018; // enable interrupt T1MR1 =0x0001387; // reset and gives interrupt when match occurs T1TC =0x00000000; T1PC =0x00000000; T1PR =0x00000004; //set timer frequency to 1h T1EMR =0x00C0; // When match occurs Toggle MIC_APR &=~0x00020000; MIC_ATR &=~0x00020000; // Timer 1 Edge interrupt MIC_ITR &=~0x00020000; // IRQ interrupt MIC_ER |= 0x00020000; } void IRQ_Handler(void) __irq { if ((MIC_SR&0x00020000)!=0) { Irq_Timer1(); T1IR = 0x02; // Clear/Acknowledge the interrupt request } else { Irq_Other(); } } void Irq_Timer1(void) { unsigned int i; while(1) { P2_OUTP_SET|=0x00001820; // LED's Toggle for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); P2_OUTP_CLR|=0x00001820; for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); for(i=0;i<60000;i++); } } void Irq_Other (void) // Sending u to hyper terminal and Turn off my LED's { send_data('u'); P2_OUTP_CLR|=0x00001820; } /**************************************************************************************** *Function :send_data *Inputs :string *Output :none *Purpose :To print the string on serial port ****************************************************************************************/ void send_data(unsigned char ch) { U5THR=ch; while(!(U5LSR & 0x20)); } /**************************************************************************************** *Function :receive_data *Inputs :string *Output :none *Purpose :To print the string on serial port ****************************************************************************************/ unsigned char receive_data (void) { unsigned char ch; while(!(U5LSR&0x01)); ch=U5RBR; return(ch); } /**************************************************************************************** *Function :uart5_init *Inputs : *Output : *Purpose : ****************************************************************************************/ void uart5_init(void) { //UART_CLKMODE=0x00084010; // uart 4 selected UART_CLKMODE=0x00104100; // uart 5 selected U5LCR=0x83; //DLAB enable,odd parity,disble break transmission,1 stop bit,8 bit character length U5CLK =0x00000101; //x=1,y=1..115200 U5DLL=0x07; //115200 baud rate U5DLM=0x00; U5LCR=0x03; //DLAB enable,odd parity,disble break transmission,1 stop bit,8 bit character length }
.s File
LDR PC,IRQ_Addr LDR PC,FIQ_Addr ;PRESERVE8 {FALSE} IMPORT IRQ_Handler Reset_Addr DCD Reset_Handler Undef_Addr DCD Undef_Handler SWI_Addr DCD SWI_Handler PAbt_Addr DCD PAbt_Handler DAbt_Addr DCD DAbt_Handler DCD 0 ; Reserved Address IRQ_Addr DCD IRQ_Handler FIQ_Addr DCD FIQ_Handler Undef_Handler B Undef_Handler SWI_Handler B SWI_Handler PAbt_Handler B PAbt_Handler DAbt_Handler B DAbt_Handler ;IRQ_Handler B IRQ_Handler FIQ_Handler B FIQ_Handler ; Reset Handler EXPORT Reset_Handler Reset_Handler
Please take a look and tell me the problum Thanks for helping
"Project is very big and confidential also."
Really?
Anyway ... You're falling off the end of 'main'!
Thank you very much for helping. now i'm able to generate interupt.
need help again. I want to capture an interrupt which is coming on CAP3.0 for every 20ms. The interrupt coming from another device for every 20ms.
TIMCLK_CTRL1|=0x04;// Enable timer clock T0CTCR = 0x1F; //use as CAP 3 Register T0CCR &=~0x0E00;// Making CAP 0 T0TCR =0x01; // enable timer T0MCR =0x00000018;// enable interrupt MIC_APR &= ~0x00010000; MIC_ATR &= ~0x00010000; MIC_ITR &=~0x00010000; MIC_ER |= 0x00010000;
Can you please tell me the procedure to capture. Thank you.
You now have the fundamental ability to get a timer going and processing an interrupt from it.
You also now know where to look in the reference manual for the infomation concerning each.
The same section in the reference manual clearly describes what facilities are available and how they should be configured.