Hi Gilles,
i added this in configure of xenomai so i pass --enable-arm-mach=imx25
imx25) arch=5
tsc_type=__XN_TSC_TYPE_FREERUNNING;;
Furthermore in plat-mxc/include/mach/mxc.h explain which are cpumx2 and
imx25 is NOT mx2
#define cpu_is_mx2() (cpu_is_mx21() || cpu_is_mx27())
i don't understand a things.
Does the tsc necessary to calculate correct timer period, or can i
disable tsc and xenomai continue work correctly ?
However i cannot use tsc in my simple application. I resend the simple C
application that doesn't work.
Il 10/04/2012 13:25, Gilles Chanteperdrix ha scritto:
On 04/10/2012 12:39 PM, Roberto Bielli wrote:
Hi Gilles,
i tried your code but th behavior is the same.
Then i tried a linux base app and works correctly.
The tsc physical address passed to user-space looks wrong.
void __ipipe_mach_get_tscinfo(struct __ipipe_tscinfo *info)
{
info->type = IPIPE_TSC_TYPE_FREERUNNING;
if (cpu_is_mx1()) {
#ifdef CONFIG_ARCH_MX1
info->u.fr.counter = (unsigned *) (TIM1_BASE_ADDR + MX1_2_TCN);
#endif
} else if (cpu_is_mx2()) {
#ifdef CONFIG_ARCH_MX2
info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX1_2_TCN);
#endif
} else if (cpu_is_mx3() || cpu_is_mx25() ) {
#if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX25
info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX3_TCN);
#endif
}
info->u.fr.mask = 0xffffffff;
info->u.fr.tsc =&tsc->full;
}
Here cpu_is_mx2() will return true, and we will not go to cpu_is_mx25().
Are you using the tsc in user-space?
If you are passing --enable-arm-mach=mx2 to xenomai configure
script, you are using the tsc in user-space, and it is a wonder
how it works.
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#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h> /* for MCL_CURRENT and MCL_FUTURE */
#include <rtdm/rtdm.h>
#include <native/task.h>
#include <nucleus/trace.h>
#define GPIO6_ON *Gpio2ValAddr |= 1 << 6
#define GPIO6_OFF *Gpio2ValAddr &= ~(1 << 6);
static RT_TASK rt_task_desc;
static RT_TASK tsk2ms;
//dati per la gestione memoria mappata
static unsigned long * Gpio2ValAddr = NULL;
volatile int cnt2ms = 0;
volatile int cntmain = 0;
volatile int x;
void funct2ms( void * params )
{
for(;;)
{
GPIO6_ON;
rt_task_sleep( 2000000 );
++ cnt2ms;
GPIO6_OFF;
}
}
int main(int argc, char *argv[])
{
int count = 0;
int traceOn = 0;
int fd, ret;
// no memory-swapping for this programm
ret = mlockall(MCL_CURRENT | MCL_FUTURE);
if( ret )
{
perror("ERROR : mlockall has failled");
exit(1);
}
fd = open( "/dev/mem", O_RDWR | O_SYNC );
printf( "FD=%d", fd );
fflush( stdout );
Gpio2ValAddr = (unsigned long *)mmap( NULL, 0x1000, PROT_READ |
PROT_WRITE, MAP_SHARED, fd, 0x53FD0000 );
GPIO6_ON;
GPIO6_OFF;
rt_task_create( &tsk2ms, "task2ms",0, 99, 0 );
rt_task_start( &tsk2ms, funct2ms, NULL );
ret = rt_task_shadow(&rt_task_desc, NULL, 1, 0);
if( ret != 0 )
{
fprintf(stderr, "ERROR : rt_task_shadow: %s\n", strerror(-ret));
exit( 1 );
}
for(;;)
{
for( x=0; x < 1000000; x++ );
for( x=0; x < 1000000; x++ );
//xntrace_user_freeze(0, 0);
for( x=0; x < 1000000; x++ );
for( x=0; x < 1000000; x++ );
rt_task_sleep( 10000000 );
}
return 0;
}
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