TMS320F28069 外部晶振配置

用TMS320F28069的X2 X2脚接20M外部晶振  总是跑不起来  有相关资料或者例程吗？

Forrest：

在28069例程包中的F2806x_SysCtrl.c中有这个例程:

void XtalOscSel (void)  {

    EALLOW;

    SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;     // Turn on XTALOSC

    SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 1;      // Turn off XCLKIN

    SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;  // Switch to external clock

    SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 1;   // Switch from INTOSC1 to INTOSC2/ext clk

    SysCtrlRegs.CLKCTL.bit.WDCLKSRCSEL = 0;    // Clock Watchdog off of INTOSC1 always

    SysCtrlRegs.CLKCTL.bit.INTOSC2OFF = 1;     // Turn off INTOSC2

    SysCtrlRegs.CLKCTL.bit.INTOSC1OFF = 0;     // Leave INTOSC1 on

    EDIS;

}

例程在controlsuite中:

www.ti.com/…/controlsuite

用TMS320F28069的X2 X2脚接20M外部晶振  总是跑不起来  有相关资料或者例程吗？

bluse：

回复 Forrest:

我的程序是用的C:\TI\controlSUITE\device_support\f2806x\v115\F2806x_examples\F2806xAdcRFFT里的例程，我已经在时钟配置里 把IntOsc1Sel();改成XtalOscSel();还是不行，我用示波器看了20M晶振波形是好的！还有什么原因导致程序跑不起来呢？

void InitSysCtrl(void)

{

  // Disable the watchdog

  DisableDog();

  // *IMPORTANT*

  // The Device_cal function, which copies the ADC & oscillator calibration values

  // from TI reserved OTP into the appropriate trim registers, occurs automatically

  // in the Boot ROM. If the boot ROM code is bypassed during the debug process, the

  // following function MUST be called for the ADC and oscillators to function according

  // to specification. The clocks to the ADC MUST be enabled before calling this

  // function.

  // See the device data manual and/or the ADC Reference

  // Manual for more information.

  EALLOW;

  SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1; // Enable ADC peripheral clock

  (*Device_cal)();

  SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 0; // Return ADC clock to original state

  EDIS;

  // Select Internal Oscillator 1 as Clock Source (default), and turn off all unused clocks to

  // conserve power.

  //IntOsc1Sel();

  XtalOscSel();

  // Initialize the PLL control: PLLCR and CLKINDIV

  // DSP28_PLLCR and DSP28_CLKINDIV are defined in F2806x_Examples.h

  InitPll(DSP28_PLLCR,DSP28_DIVSEL);//16  2

  // Initialize the peripheral clocks

  InitPeripheralClocks();

}