Tool/software: TI-RTOS
Hello;
I have started to the TI-RTOS workshop training series. According to the video Labs I am trying to solve Hwi usage. I try to use Hwi with Timer2A. But I faced with some issue about usage of Hwi and it's logic.
In the example that I try , led should blink every 1 second according to the Timer2A based Hwi.
This is the code;
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/*
* ======== empty.c ========
*/
/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/runtime/System.h>
/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/hal/Hwi.h>
/* TI-RTOS Header files */
// #include <ti/drivers/EMAC.h>
#include <ti/drivers/GPIO.h>
// #include <ti/drivers/I2C.h>
// #include <ti/drivers/SDSPI.h>
// #include <ti/drivers/SPI.h>
// #include <ti/drivers/UART.h>
// #include <ti/drivers/USBMSCHFatFs.h>
// #include <ti/drivers/Watchdog.h>
// #include <ti/drivers/WiFi.h>
/* Board Header file */
#include "Board.h"
#define TASKSTACKSIZE 512
Hwi_Handle hwi1;
Clock_Handle clkH;
Task_Struct task0Struct;
Char task0Stack[TASKSTACKSIZE];
/*
* ======== heartBeatFxn ========
* Toggle the Board_LED0. The Task_sleep is determined by arg0 which
* is configured for the heartBeat Task instance.
*/
Void hwiFxn(){
Clock_getTicks();
GPIO_toggle(Board_LED1);
}
Void heartBeatFxn(UArg arg0, UArg arg1)
{
while (1) {
Task_sleep((unsigned int)arg0);
GPIO_toggle(Board_LED0);
}
}
/*
* ======== main ========
*/
int main(void)
{
Hwi_Params hwiP;
Task_Params taskParams;
/* Call board init functions */
Board_initGeneral();
// Board_initEMAC();
Board_initGPIO();
// Board_initI2C();
// Board_initSDSPI();
// Board_initSPI();
// Board_initUART();
// Board_initUSB(Board_USBDEVICE);
// Board_initUSBMSCHFatFs();
// Board_initWatchdog();
// Board_initWiFi();
/* Construct heartBeat Task thread */
Task_Params_init(&taskParams);
taskParams.arg0 = 1000;
taskParams.stackSize = TASKSTACKSIZE;
taskParams.stack = &task0Stack;
Task_construct(&task0Struct, (Task_FuncPtr)heartBeatFxn, &taskParams, NULL);
Hwi_Params_init(&hwiP);
hwiP.arg=0;
hwiP.eventId=1;
hwiP.priority=0;
hwi1=Hwi_create(39,hwiFxn,&hwiP,NULL);
/* Turn on user LED */
GPIO_write(Board_LED0, Board_LED_ON);
GPIO_write(Board_LED1, Board_LED_ON);
System_printf("Starting the example\nSystem provider is set to SysMin. "
"Halt the target to view any SysMin contents in ROV.\n");
/* SysMin will only print to the console when you call flush or exit */
System_flush();
/* Start BIOS */
BIOS_start();
return (0);
}
When I tried that code the blink is not working. When I look at other posts there are another type of usage like by setting a clock 1 second period clock and triggering function which we created for Hwi function. I did not understand why we are creating the Hardware interrup and setting it's function.
Is it just for preemption or just for setting ISR priority and interrupt type.?
It would be very helpful to understand basic concepts by examples and it is structure, why we are defining a Hwi function and after that why this function should be called from another object like clock.
I would be very appreciated If I can get the answer. Thank you.
Best regards,
