diff options
Diffstat (limited to 'src/arch/msp430fr5969lp')
| -rw-r--r-- | src/arch/msp430fr5969lp/arch.cc | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/src/arch/msp430fr5969lp/arch.cc b/src/arch/msp430fr5969lp/arch.cc index 04a52c9..7de978c 100644 --- a/src/arch/msp430fr5969lp/arch.cc +++ b/src/arch/msp430fr5969lp/arch.cc @@ -9,13 +9,34 @@ void Arch::setup(void) PM5CTL0 &= ~LOCKLPM5; - FRCTL0 = FWPW; - FRCTL0_L = 0x10; - FRCTL0_H = 0xff; + /* + * Note: arch drivers assume SMCLK freq == F_CPU + */ + +#if F_CPU == 16000000UL + FRCTL0 = FWPW; // unlock FRAM Control + FRCTL0_L = 0x10; // one wait state before FRAM access (required for 8MHz < F_CPU <= 16 MHz) + FRCTL0_H = 0xff; // lock FRAM control by writing an invalid password // 16MHz DCO CSCTL0_H = CSKEY >> 8; CSCTL1 = DCORSEL | DCOFSEL_4; +#elif F_CPU == 8000000UL + // 8MHz DCO + CSCTL0_H = CSKEY >> 8; + CSCTL1 = DCOFSEL_6; +#elif F_CPU == 4000000UL + // 8MHz DCO + CSCTL0_H = CSKEY >> 8; + CSCTL1 = DCOFSEL_3; +#elif F_CPU == 1000000UL + // 8MHz DCO + CSCTL0_H = CSKEY >> 8; + CSCTL1 = DCOFSEL_0; +#else +#error Unsupported F_CPU +#endif + #ifdef WITH_LOOP CSCTL2 = SELA__LFXTCLK | SELS__DCOCLK | SELM__DCOCLK; #else |