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Jawbreaker LPC crystal oscillator startup

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This commit is contained in:
Michael Ossmann
2012-09-20 10:53:07 -06:00
parent 2c813ec41e
commit 425a384832
1 changed files with 5 additions and 1 deletions
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6
firmware/common/hackrf_core.c
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@ -122,14 +122,18 @@ void cpu_clock_init(void)
//FIXME disable I2C
/*
* 12MHz clock is entering LPC XTAL1/OSC input now.
* 12MHz clock is entering LPC XTAL1/OSC input now. On
* Jellybean/Lemondrop, this is a signal from the clock generator. On
* Jawbreaker, there is a 12 MHz crystal at the LPC.
* Set up PLL1 to run from XTAL1 input.
*/
//FIXME a lot of the details here should be in a CGU driver
#ifdef JELLYBEAN
/* configure xtal oscillator for external clock input signal */
CGU_XTAL_OSC_CTRL |= CGU_XTAL_OSC_CTRL_BYPASS;
#endif
/* set xtal oscillator to low frequency mode */
CGU_XTAL_OSC_CTRL &= ~CGU_XTAL_OSC_CTRL_HF;