CC2541,外部晶振失败后，如何重启外部晶振

zuoyun yang

Prodigy 10 points

外部32.768khz晶振因焊接问题，导致外部晶振失效，重新焊好之后发现单片机并没有重新使用外部晶振，是否是进入了内部晶振模式？如何恢复呢？

非常感谢！

8 年多前

0 Susan Yang 8 年多前

TI__Guru**** 252096 points

// set 32kHz OSC and wait until it is stable
#define SET_32KHZ_OSC() \
{                                                                              \
  CLKCONCMD = (CLKCONCMD & ~0x80) | OSC_32KHZ;                                 \
  while ( (CLKCONSTA & 0x80) != OSC_32KHZ );                                   \
}

默认是使用外部的32k晶振的，您可以重新烧录程序试试。

0 Butterfly 8 年多前

TI__Genius 14990 points

#define BV(n) (1 << (n))

#define XOSC_STB BV(6) /* XOSC: powered, stable=1 */
#define HFRC_STB BV(5) /* HFRCOSC: powered, stable=1 */
/* CLKCONCMD bit definitions */
#define OSC BV(6)
#define TICKSPD(x) (x << 3)
#define CLKSPD(x) (x << 0)
#define CLKCONCMD_32MHZ (0)
#define CLKCONCMD_16MHZ (CLKSPD(1) | TICKSPD(1) | OSC)
#define OSC_PD BV(2) /* Idle Osc: powered down=1 */

#define EXTERNAL_CRYSTAL_OSC 0x00 // external 32kHz XOSC
#define INTERNAL_RC_OSC 0x80 // internal 32kHz RCOSC

// For non-USB, assume external, unless an internal crystal is explicitly indicated.
#define XOSC32K_INSTALLED TRUE //FALSE TRUE
#if !defined (XOSC32K_INSTALLED) || (defined (XOSC32K_INSTALLED) && (XOSC32K_INSTALLED == TRUE))
#define OSC_32KHZ EXTERNAL_CRYSTAL_OSC
#else
#define OSC_32KHZ INTERNAL_RC_OSC
#endif

//START_HSOSC_XOSC
SLEEPCMD &= ~OSC_PD; /* start 16MHz RCOSC & 32MHz XOSC */
while (!(SLEEPSTA & XOSC_STB)); /* wait for stable 32MHz XOSC */

//SET_OSC_TO_HSOSC
CLKCONCMD = (CLKCONCMD & 0x80) | CLKCONCMD_16MHZ;
while ( (CLKCONSTA & ~0x80) != CLKCONCMD_16MHZ );

//SET_32KHZ_OSC
CLKCONCMD = (CLKCONCMD & ~0x80) | OSC_32KHZ;
while ( (CLKCONSTA & 0x80) != OSC_32KHZ );

//SET_OSC_TO_XOSC
CLKCONCMD = (CLKCONCMD & 0x80) | CLKCONCMD_32MHZ;
while ( (CLKCONSTA & ~0x80) != CLKCONCMD_32MHZ );

//STOP_HSOSC
SLEEPCMD |= OSC_PD; /* stop 16MHz RCOSC */

低于 1GHz

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CC2541,外部晶振失败后，如何重启外部晶振