Hello,
I have created below program from New CCS project and SYS/BIOS typical template.
/*
* ======== main.c ========
*/
#include <xdc/std.h>
#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Clock.h>
/*
* ======== taskFxn ========
*/
Void task1Fxn(UArg a0, UArg a1)
{
System_printf("enter task1Fxn(): %d\n",(Int)a0);
System_printf("exit task1Fxn()\n");
}
Void task2Fxn(UArg a0, UArg a1)
{
System_printf("enter task2Fxn(): %d\n",(Int)a0);
System_printf("exit task2Fxn()\n");
}
Void clkFxn(UArg a0)
{
UInt32 ticks;
System_printf("Entered Clock Function\n");
Task_yield();
ticks = Clock_getTicks();// Time in Clock ticks()
if(ticks > 20)
BIOS_exit(0);
System_printf("Exit Clock Function\n");
}
/*
* ======== main ========clk
*/
Void main()
{
Task_Handle task1,task2;
Task_Params taskParams;
Clock_Params clkParams;
Error_Block eb;
System_printf("enter main()\n");
//create Clock dynamically
Clock_Params_init(&clkParams);
clkParams.period = 2;
clkParams.arg = 0;
clkParams.startFlag = TRUE;
Clock_create(clkFxn, 2, &clkParams,NULL);
Task_Params_init(&taskParams);
//Create task1
Error_init(&eb);
taskParams.arg0 = 1;
taskParams.priority = 3;
taskParams.stackSize = 512;
task1 = Task_create(task1Fxn, &taskParams, &eb);
if (task1 == NULL) {
System_printf("Task_create() failed!\n");
BIOS_exit(0);
}
//Create task2
Error_init(&eb);
taskParams.arg0 = 2;
taskParams.priority = 3;
taskParams.stackSize = 512;
task2 = Task_create(task2Fxn, &taskParams, &eb);
if (task2 == NULL) {
System_printf("Task_create() failed!\n");
BIOS_exit(0);
}
BIOS_start(); /* enable interrupts and start SYS/BIOS */
}
-------------------------------------------------------------------------------------------------------
1) one clock function is defined with period = 2 ticks. ( clkFxn)
2) two task functions are defined with same priority = 3 (task1Fxn and task2Fxn)
I used Task_yield() in clock function.
So, I believe that the sequence should be like,
1) Clock tick shall start
2) with 2delay +2 period ticks completed, and clock function shall come in picture.
3) Task_yield() shall be executed and control shall go to task1Fxn.
4) With more 2 ticks, Task_yield() shall be executed again and control shall go to task2 Fxn.
5) Sequence 3 and 4 shall remain continue till tick time <20
I get below output:
[Cortex_M3_0] n(): 1
exit task1Fxn()
enter task2Fxn(): 2
exit task2Fxn()
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
Exit Clock Function
Entered Clock Function
but I believe that between every, Entered Clock Function and Exit Clock Function, there should be printfs of task1Fxn and task2Fxn alternatively.
Is my understanding about time slicing correct? or I am missing some fundamental?
( I referred to Example 3.1 Time Slicing from SYS/BIOS v 6.35 User's guide - June2013)
Thanks in advance.
