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cc2538: lpm: Let system clock transitions complete before further changes
As a matter of precaution, always make sure that pending system clock transitions are complete before requesting a new change of the system clock source. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
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@ -158,6 +158,9 @@ enter_pm0(void)
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static void
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static void
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select_32_mhz_xosc(void)
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select_32_mhz_xosc(void)
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{
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{
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/*First, make sure there is no ongoing clock source change */
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while((REG(SYS_CTRL_CLOCK_STA) & SYS_CTRL_CLOCK_STA_SOURCE_CHANGE) != 0);
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/* Turn on the 32 MHz XOSC and source the system clock on it. */
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/* Turn on the 32 MHz XOSC and source the system clock on it. */
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REG(SYS_CTRL_CLOCK_CTRL) &= ~SYS_CTRL_CLOCK_CTRL_OSC;
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REG(SYS_CTRL_CLOCK_CTRL) &= ~SYS_CTRL_CLOCK_CTRL_OSC;
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