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LPC21 SPI IRQ
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Read-Only Author miroslav fiala Posted 21-Jun-2006 09:13 Toolset ARM |  LPC21 SPI IRQmiroslav fiala Hi, I'm sorry for a stupid question but I'm having BIG troubles trying to run SPI using IRQ.I have SSEL0 pulled up to +3.3V. And SPI works fine when I just poll SPIF like:
S0SPDR=0xXX;
while(!(S0SPSR & 0x80)){}
But when I want to setup IRQ after SPI transfer is done. It don't work. It don't go into ISR at all. I think that after I fill S0SPDR with data to transfer, it should go into ISR after some time right? Or do I have to do something else??? Very strange is that in emulator it works fine! But in real LPC2129 it don't (I've put a breakpoint there using ULINK JTAG (It works fine for USART0 ISR))!!! I setup SPI like this: /* Configure Pin Connect Block */ PINSEL0=0x5500; /* Set pclk to same as cclk */ VPBDIV=0x01; /* Set to highest speed for SPI at 60 MHz -> 7.5 MHz */ S0SPCCR=0x08; VICIntSelect &= ~( 0x0400 ); VICIntEnable |= 0x0400; VICVectAddr2 = ( unsigned long ) vSPI0_ISR; VICVectCntl2 = 0x02a; /* Device selected as master, IRQ on */ S0SPCR=0xa0; Thank You in advance, Mirek |
Read-Only Author miroslav fiala Posted 22-Jun-2006 06:50 Toolset ARM | RE: LPC21 SPI IRQ miroslav fiala I've found this. It should help.http://www.keil.com/download/docs/297.asp Mirek |
Read-Only Author miroslav fiala Posted 22-Jun-2006 08:03 Toolset ARM | RE: LPC21 SPI IRQ miroslav fiala Hey, it does the same...Directory EX22-SPI file main.c it loops on line 34 waiting for 'lock' forever...
030 SPI_write(output_buffer,8);
031 while(lock)
032 {
033 ;
034 }
'lock' is set in ISR, so it apparently don't go into ISR too!!! It don't seem to be a debugger bug, It don't send anything to SPI (just first byte)... Don't anyone have a working examle of SPI on LPC2129 with IRQ??? PLEASE!!! Thanx a lot, Mirek |
Read-Only Author miroslav fiala Posted 23-Jun-2006 03:00 Toolset ARM | RE: LPC21 SPI IRQ - Keil ULINK BUG? miroslav fiala Hi folks, it's me again.I think it must be some kinda ULINK bug. It works now, but only if I reset device manualy e.g. press reset. If I reset CPU and RUN it from Keil debugger (using Keil ULINK), LPC sends just TWO (?!?!?!) bytes to SPI and then gives it up. But it don't die, LEDs keep blinking. Just IRQ don't work... Can You explain me this, please? If You wanna try it yourself, its based on blinky example in c:\Keil\ARM\Examples\Blinky\, but put into one file only:
/******************************************************************************/
/* This file is part of the uVision/ARM development tools */
/* Copyright KEIL ELEKTRONIK GmbH 2002-2004 */
/******************************************************************************/
/* */
/* BLINKY.C: LED Flasher */
/* */
/******************************************************************************/
#include <LPC21xx.H> /* LPC21xx definitions */
long timeval;
void wait (void) { /* wait function */
unsigned long i;
i = timeval;
while ((i + 10) != timeval); /* wait 100ms */
}
/* Timer Counter 0 Interrupt executes each 10ms @ 60 MHz CPU Clock */
void tc0 (void) __irq {
++timeval;
T0IR = 1; // Clear interrupt flag
VICVectAddr = 0; // Acknowledge Interrupt
}
/* Setup the Timer Counter 0 Interrupt */
void init_timer (void) {
T0MR0 = 149999; // 10mSec = 150.000-1 counts
T0MCR = 3; // Interrupt and Reset on MR0
T0TCR = 1; // Timer0 Enable
VICVectAddr0 = (unsigned long)tc0; // set interrupt vector in 0
VICVectCntl0 = 0x20 | 4; // use it for Timer 0 Interrupt
VICIntEnable = 0x00000010; // Enable Timer0 Interrupt
}
//------------------------------------------------------------------------------------------------------
// SPI0 ISR used to send next char
void vSPI0_ISR( void ) __irq
{
char cChar;
// while(1);
// What caused the interrupt? Flags are cleared by reading the register folowed by accesing SPI data register...
switch( S0SPSR & 0xc0 )
{
cChar=S0SPSR;
case 0x40: // ignore for now
cChar=S0SPDR;
break;
case 0x80: // post another char, if U have one
cChar=S0SPDR;
S0SPDR=0x42;
break;
}
S0SPINT=0x01;
// Clear the ISR in the VIC.
VICVectAddr = 0;
}
int main (void) {
unsigned int j; /* LED var */
/////////////////////////////////////////////////////////////////////////////////////////
/* Configure Pin Connect Block */
PINSEL0=0x5500;
/* Set pclk to same as cclk */
// VPBDIV=0x01;
/* Set to highest speed for SPI at 60 MHz -> 7.5 MHz */
S0SPCCR=0x08;
VICIntSelect &= ~( 0x0400 );
VICIntEnable |= 0x0400;
VICVectAddr2 = ( unsigned long ) vSPI0_ISR;
VICVectCntl2 = 0x02a;
/* Device selected as master */
S0SPINT=0x01;
S0SPCR=0xa0;
/////////////////////////////////////////////////////////////////////////////////////////
IODIR1 = 0xFF0000; /* P1.16..23 defined as Outputs */
init_timer();
S0SPDR=0x42;
while (1) {
// S0SPDR=0x42;
/* Wait for transfer to be completed */
// while(!(S0SPSR & 0x80)){} /* Loop forever */
for (j = 0x010000; j < 0x800000; j <<= 1) { /* Blink LED 0,1,2,3,4,5,6 */
IOSET1 = j; /* Turn on LED */
wait (); /* call wait function */
IOCLR1 = j; /* Turn off LED */
}
for (j = 0x800000; j > 0x010000; j >>=1 ) { /* Blink LED 7,6,5,4,3,2,1 */
IOSET1 = j; /* Turn on LED */
wait (); /* call wait function */
IOCLR1 = j; /* Turn off LED */
}
}
}
Have a nice day, Mirek |
Read-Only Author Reinhard Keil Posted 23-Jun-2006 04:00 Toolset ARM | RE: LPC21 SPI IRQ - Keil ULINK BUG? Reinhard Keil Did you read this?http://www.keil.com/support/docs/2767.htm |
Read-Only Author miroslav fiala Posted 23-Jun-2006 07:16 Toolset ARM | RE: LPC21 SPI IRQ - Keil ULINK BUG? miroslav fiala ...Yes... it's much clearer now. Thank you. Mirek |
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