TIMEBASE TIMER problem

[ngaylard]

Posted on May 29, 2007 at 16:58

TIMEBASE TIMER problem

[ngaylard]

Posted on May 22, 2007 at 17:19

Hello,

I am struggling to get a timebase timer to work on an STR735. The processor is running (verified through flashing LED's). I need a timer on a 500 millisecond timebase to schedule activities. The following steps have been done with no success:

In Main initialisation:

Use Timer Base with End Of Count Interrupt

------------------------------------------------------------------------------*/

/* TB2 Clock Enable */

CFG_PeripheralClockConfig(CFG_CLK_TB2 , ENABLE);

/* EIC Clock Enable */

CFG_PeripheralClockConfig(CFG_CLK_EIC , ENABLE);

/* EIC Configuration */

EIC_IRQChannelConfig(TB2_IRQChannel, ENABLE );

EIC_IRQChannelPriorityConfig(TB2_IRQChannel,1);

/*TB2 Configuration to toggle Leds each 500ms */

TB_InitStructure.TB_CLK_Source = TB_CLK_INTERNAL;

TB_InitStructure.TB_Prescaler = 0xEF; /* The internal TB Frequency = 100KHz */

TB_InitStructure.TB_Preload = 0xC350 ; /* 100000Hz * 0.5 s = 0xC350 */

TB_Init (TB2, &TB_InitStructure);

EIC_IRQCmd(ENABLE);

TB_ITConfig (TB2,ENABLE);

TB_Cmd(TB2, ENABLE);

In the interupt vectors I have:

void TB2_IRQHandler (void)

{

GPIO_BitWrite(GPIO1,GPIO_PIN_14 ,~GPIO_BitRead(GPIO1,GPIO_PIN_14));

TB_FlagClear(TB2);

}

(Please note the pin read/write and hardware was tested using the main loop previously).

Many thanks

[xaviooo]

Posted on May 23, 2007 at 05:08

Well, i'm currently working on the timebase timer (see my topic above...).

I can create an update every 10us (I could have a 500ms), but I can't use this timer in other functions...

To me, what you've done seems good, but are you sure of the Prescaler and Preload values ?

What is your problem ? Is the timebase too fast or too quick ?

If you have something new, you can contact me at

mailto:[e-mail]

or look at my topic :).

[ngaylard]

Posted on May 23, 2007 at 16:16

I have resolved the issue, the PLL is not setup correctly and therefore the device speed was completely different to that expected.

Working well now thanks

[kaouther]

Posted on May 29, 2007 at 16:58

Good!

The STR73x firmware library provides a helpfull example for TB as well as for all peripherals. ;)