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kinetis: Add support for CPUs with RSIM module

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Some KW series CPUs have no OSC module, but uses the oscillator found in
the built-in transceiver.
This commit is contained in:
Joakim Nohlgård 2017-04-27 15:42:22 +02:00
parent ef9007b56c
commit aa67bdbc42
1 changed files with 31 additions and 0 deletions
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31
cpu/kinetis_common/periph/mcg.c
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@ -155,6 +155,8 @@ static inline void kinetis_mcg_set_fll_factor(uint8_t factor)
MCG->C4 |= (uint8_t)(factor);
}
#ifdef OSC0
/* Kinetis with OSC module */
/**
* @brief Enable Oscillator module
*
@ -187,6 +189,35 @@ static void kinetis_mcg_enable_osc(void)
while ((MCG->S & MCG_S_OSCINIT0_MASK) == 0) {}
}
}
#elif defined(RSIM)
/**
* @brief Enable oscillator from RSIM module
*
* This is for Kinetis CPUs with a radio system integration module which can
* provide an oscillator output.
*/
static void kinetis_mcg_enable_osc(void)
{
/* Enable RF oscillator circuit */
/* Current setting is that the OSC only runs in RUN and WAIT modes, see ref.man. */
*bme_bitfield32(&RSIM->CONTROL, RSIM_CONTROL_RF_OSC_EN_SHIFT, 4) = RSIM_CONTROL_RF_OSC_EN(1);
/* Chip errata
* e10224: RSIM: XTAL_OUT_EN signal from the pin is enabled by default
*
* Description: The XTAL_OUT_EN signal from the default XTAL_OUT_EN pin,
* PTB0, is enabled out of reset. This will result in the reference
* oscillator being enabled when this pin is asserted high regardless of the
* port control multiplexor setting.
*
* Workaround: To prevent the pin from enabling the XTAL out feature
* unintentionally, set RSIM_RF_OSC_CTRL[RADIO_EXT_OSC_OVRD_EN]=1.
*/
bit_set32(&RSIM->RF_OSC_CTRL, RSIM_RF_OSC_CTRL_RADIO_EXT_OSC_OVRD_EN_SHIFT);
/* Wait for oscillator ready signal */
while((RSIM->CONTROL & RSIM_CONTROL_RF_OSC_READY_MASK) == 0) {}
}
#endif
/**
* @brief Initialize the FLL Engaged Internal Mode.