CC2640R2F: one shot gptimer interrupt

Hynag Chung

Intellectual 980 points

Part Number: CC2640R2F
Other Parts Discussed in Thread: SYSBIOS

Hi,

I want to use oneshot gptimer interrupt.

Like, when timer reaches load count value, it goes to ISR and at the end of ISR, timer starts again.

Actually what I exactly try to do is that when gpio interrupt is occurred, timer is started,

But to make it simple exercise, i just set timer start in ISR,

Here is my code and it does not work anything. I've been searching in GPTimerCC26XX.h File Reference and still don't know.

So please give me advice about my code instead of that reference.

GPTimerCC26XX_Handle hTimer;
void timerCallback(GPTimerCC26XX_Handle handle, GPTimerCC26XX_IntMask interruptMask) {
// interrupt callback code goes here. Minimize processing in interrupt.
System_printf("timer\n");
System_flush();
GPTimerCC26XX_start(hTimer);
}

/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
GPTimerCC26XX_Params params;
GPTimerCC26XX_Params_init(&params);
params.width = GPT_CONFIG_16BIT;
params.mode = GPT_MODE_ONESHOT_UP ;
params.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;
hTimer = GPTimerCC26XX_open(Board_GPTIMER0A, &params);
if(hTimer == NULL) {
System_printf("timer error\n");
System_flush();
while(1);
}

System_printf("timer start\n");
System_flush();

GPTimerCC26XX_setLoadValue(hTimer, 100);
GPTimerCC26XX_registerInterrupt(hTimer, timerCallback, GPT_INT_TIMEOUT);
GPTimerCC26XX_start(hTimer);

}

over 7 years ago

0 J Lindh over 7 years ago

TI__Guru 57865 points

Hi Hynag,
I suggest you use a software based clock instead. Have you looked at the clock chapter in the BLE UG:

dev.ti.com/.../privacy.html

0 Hynag Chung over 7 years ago in reply to J Lindh

Intellectual 980 points

Hi,
I think you gave me wrong link, it's about privacy.
Also I need to use 48Mhz clock but maximum frequency of sysbios clock is lower than that.
this is why I need to use GPTimer.
Thank you.

0 J Lindh over 7 years ago in reply to Hynag Chung

TI__Guru 57865 points

Hi,
Sorry for that:
dev.ti.com/.../clocks.html

However, sounds like GP timer is a requirement for you. The only recommendation I have is to look at the GP Timer documentation, it has code examples.
dev.ti.com/.../_g_p_timer_c_c26_x_x_8h.html

0 Hynag Chung over 7 years ago in reply to J Lindh

Intellectual 980 points

Ok, then I have another question. I want to get kind of tick from GPTimer.
There is GPTimerCC26XX_getFreeRunValue() and GPTimerCC26XX_getValue().
It seems like I can get tick from timer. So I just want to check it.
I want time difference between each ISR , which is delta in code below.
But there is no change in time0,time1, and delta.
I checked GPTimer is opened successfully.
What do you think what problem is?

GPTimerCC26XX_Handle hTimer;
GPTimerCC26XX_Value time1=0;
GPTimerCC26XX_Value time0=0;
GPTimerCC26XX_Value delta;
void timerCallback(GPTimerCC26XX_Handle handle, GPTimerCC26XX_IntMask interruptMask) {
// interrupt callback code goes here. Minimize processing in interrupt.
time1=GPTimerCC26XX_getValue(handle);
delta=time1-time0;
GPTimerCC26XX_start(hTimer);
time0=time1;
}

/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
GPTimerCC26XX_Params params;
GPTimerCC26XX_Params_init(&params);
params.width = GPT_CONFIG_16BIT;
params.mode = GPT_MODE_ONESHOT_UP ;
params.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;
hTimer = GPTimerCC26XX_open(Board_GPTIMER0A, &params);
if(hTimer == NULL) {
System_printf("timer error\n");
System_flush();
while(1);
}

GPTimerCC26XX_setLoadValue(hTimer, 100);
GPTimerCC26XX_registerInterrupt(hTimer, timerCallback, GPT_INT_TIMEOUT);
GPTimerCC26XX_start(hTimer);

}