Hello there,
I tried the SWI example code on my TMDSICE3359 board. The code is as follows.
#include <xdc/std.h>
#include <xdc/runtime/System.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Swi.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Semaphore.h>
#include <xdc/cfg/global.h>
Swi_Handle swi0, swi1;
Semaphore_Handle sem0;
/*
* ======== swi0Fxn =======
*/
Void swi0Fxn(UArg arg0, UArg arg1)
{
System_printf("Enter swi0Fxn, a0 = %d, a1 = %d\n", (Int)arg0, (Int)arg1);
System_printf("swi0 trigger = %d\n", Swi_getTrigger());
System_printf("swi0 pri = %d\n", Swi_getPri(swi0));
System_printf("Exit swi0Fxn\n\r\n");
}
/*
* ======== swi1Fxn =======
*/
Void swi1Fxn(UArg arg0, UArg arg1)
{
System_printf("Enter swi1Fxn, a0 = %d, a1 = %d\n", (Int)arg0, (Int)arg1);
System_printf("swi1 trigger = %d\n", Swi_getTrigger());
System_printf("swi1 pri = %d\n", Swi_getPri(swi1));
System_printf("Exit swi1Fxn\n");
}
/*
* ======== clk0Fxn =======
*/
Void clk0Fxn(UArg arg0)
{
System_printf("Enter Clock Function\n");
Swi_post(swi0);
//Swi_post(swi1);
System_printf("Enter Sema\n");
Semaphore_post(sem0);
System_printf("Exit Clock Function\n");
}
/*
* ======== tsk0Fxn =======
*/
Void tsk0Fxn(UArg arg0, UArg arg1)
{
UInt key;
/* wait for swis to be posted from Clock function */
Semaphore_pend(sem0, BIOS_WAIT_FOREVER);
System_printf("Running tsk0Fxn\n");
key = Swi_disable(); /* swis are disabled */
Swi_inc(swi0); /* swi0 trigger = 1 */
Swi_inc(swi0); /* swi0 trigger = 2 */
Swi_restore(key); /* swi0 runs */
//Swi_or(swi1, 0x100); /* swi1 runs with trigger = 0x103 */
//Swi_andn(swi1, 0x1); /* swi1 trigger = 0x10 */
//Swi_andn(swi1, 0x2); /* swi1 runs with trigger = 0x00 */
//Swi_dec(swi1); /* swi1 trigger = 2 */
//Swi_dec(swi1); /* swi1 trigger = 1 */
//Swi_dec(swi1); /* swi1 runs with trigger = 0 */
System_printf("Calling BIOS_exit\n");
BIOS_exit(0);
}
/*
* ======== main ========
*/
Int main()
{
Swi_Params swiParams;
Task_Params taskParams;
Clock_Params clkParams;
Swi_Params_init(&swiParams);
swiParams.arg0 = 1;
swiParams.arg1 = 1;
swiParams.priority = 2;
swiParams.trigger = 0;
swi0 = Swi_create(swi0Fxn, &swiParams, NULL);
/*
swiParams.arg0 = 2;
swiParams.arg1 = 0;
swiParams.priority = 1;
swiParams.trigger = 1;
swi1 = Swi_create(swi1Fxn, &swiParams, NULL);
*/
Task_Params_init(&taskParams);
taskParams.priority = 1;
Task_create (tsk0Fxn, &taskParams, NULL);
Clock_Params_init(&clkParams);
clkParams.startFlag = TRUE;
Clock_create(clk0Fxn, 2, &clkParams, NULL);
sem0 = Semaphore_create(0, NULL, NULL);
BIOS_start(); /* does not return */
return(0);
}
I don't have any problem to debug this piece of code. However, the result can't be explained in term of the trigger value of the SWI. The debug result is copied as follows.
[CortxA8] Enter Clock Function
Enter Sema
Exit Clock Function
Enter swi0Fxn, a0 = 1, a1 = 1
swi0 trigger = 0
swi0 pri = 2
Exit swi0Fxn
Running tsk0Fxn
Enter swi0Fxn, a0 = 1, a1 = 1
swi0 trigger = 2
swi0 pri = 2
Exit swi0Fxn
Calling BIOS_exit
Can you help to explain how the trigger works and changes? Many thanks.
