TMS320F28069M: Change internal oscillator to external oscillator in motorware

Shiranga Ariyasinghe

Hi all,

I was recently trying to switch the internal oscillator to external oscillator in HAL_setupClks function. I needed to keep system clock 90Mhz as it is. I refereed few conversation in the forum regarding this. But did not worked.

So far I tried to mimic control suit XtalOscSel function in HAL_setupClks as below,

CLK_enableCrystalOsc(obj->clkHandle);//enable

usDelay(1000);

CLK_disableClkIn(obj->clkHandle);

CLK_setOsc2Src(obj->clkHandle, CLK_Osc2Src_External);

CLK_setOscSrc(obj->clkHandle,CLK_OscSrc_External);

CLK_setLowSpdPreScaler(obj->clkHandle,CLK_LowSpdPreScaler_SysClkOut_by_1);

CLK_setClkOutPreScaler(obj->clkHandle,CLK_ClkOutPreScaler_SysClkOut_by_1);

But did not worked. Is there any example with external oscillator . Please help me to solve this.

Thanks.

over 8 years ago

0 Yanming Luo over 8 years ago

TI__Guru** 117210 points

What frequency is the external oscillator? The reference code is for 20MHz oscillator as below.

// enable the crystal oscillator
CLK_enableCrystalOsc(obj->clkHandle);

// Delay 1ms before converting ADC channels
usDelay(10000);

// disable the external clock in
CLK_disableClkIn(obj->clkHandle);

// set the oscillator source
CLK_setOscSrc(obj->clkHandle,CLK_OscSrc_External);

// Switch from INTOSC1 to INTOSC2/ext clk
CLK_setOsc2Src(obj->clkHandle, CLK_Osc2Src_External);

// enable internal oscillator 1
CLK_enableOsc1(obj->clkHandle);

// disable oscillator 2
CLK_disableOsc2(obj->clkHandle);

And you need to change PLL divider in HAL_setupPll()
PLL_setDivideSelect(obj->pllHandle,PLL_DivideSelect_ClkIn_by_4);

0 Shiranga Ariyasinghe over 8 years ago in reply to Yanming Luo

Expert 1145 points

Thank you Yanming, It worked.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28069M: Change internal oscillator to external oscillator in motorware