Hi,
We are using cc2540 in our project. I started with trying out some code on cc2540 Keyfob and tested SimplePeriphiralBLE application. Everything worked fine. However we I ported the application on my actual board.
I'm facing issues in HAL_BOARD_INIT() in hal_board_cfg.h. The cc2540 on custom board in not able to switch to 32MHz external cystal.
I found this macro for switching to xosc.
// switch to the 16MHz HSOSC and wait until it is stable
#define SET_OSC_TO_HSOSC() \
{ \
CLKCONCMD = (CLKCONCMD & 0x80) | CLKCONCMD_16MHZ; \
while ( (CLKCONSTA & ~0x80) != CLKCONCMD_16MHZ ); \
}
// switch to the 32MHz XOSC and wait until it is stable
#define SET_OSC_TO_XOSC() \
{ \
CLKCONCMD = (CLKCONCMD & 0x80) | CLKCONCMD_32MHZ; \
while ( (CLKCONSTA & ~0x80) != CLKCONCMD_32MHZ ); \
}
where
/* 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)
Above are define in hal_mcu.h
However in cc2540 user guide swru191f.pdf in Power management and clock chapter. The CLKCONCMD register has different configuration. Bit 6 of CLKCONCMD.OSC is meant for XOSC selection.
So the above code should be
#define SET_OSC_TO_HSOSC() \
{ \
CLKCONCMD = (CLKCONCMD & 0x40) | CLKCONCMD_16MHZ; \
while ( (CLKCONSTA & 0x40) != CLKCONCMD_16MHZ ); \
}\
where CLKCONCMD_16MHZ = BV(6)
#define SET_OSC_TO_XOSC() \
{ \
CLKCONCMD = (CLKCONCMD & ~0x40) | CLKCONCMD_32MHZ; \
while ( (CLKCONSTA & 0x40) != CLKCONCMD_32MHZ ); \
}\
where CLKCONCMD_32MHZ = (0)
Also there is another macro in hal_board_cfg.h
#define START_HSOSC_XOSC() \
{ \
SLEEPCMD &= ~OSC_PD; /* start 16MHz RCOSC & 32MHz XOSC */ \
while (!(SLEEPSTA & XOSC_STB)); /* wait for stable 32MHz XOSC */ \
}
where OSC_PD defined ias BV(2) and XOSC_STB as BV(6). However as per user guide swru191f.pdf both these bit are reserved in SLEEPCMD and SLEEPSTA register.
However if I program cc2540 Keyfob with changes are per user guide it is not working which mean that there is something wrong. Please let know which one should I follow the code example which is working or swru191f.pdf user guide clock command register description.
Thanks and Regards,
Pradeep
