Commit 1a0aaa32 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

MSP430: Support CPU speed variation in microsecond timer

parent a1bbc3b6

src/arch/msp430fr5969lp/arch.cc

+17 −5
Original line number Diff line number Diff line
@@ -60,14 +60,26 @@ void Arch::setup(void) 
#endif



#ifdef TIMER_US

	// 16MHz/16 -> ~1MHz timer

	TA0CTL = TASSEL__SMCLK | ID__8 | MC__CONTINUOUS;

	TA0EX0 = 1;

#if F_CPU == 16000000UL

	TA0CTL = TASSEL__SMCLK | ID__8 | MC__CONTINUOUS; // /8

	TA0EX0 = 1; // /2 -> /16

#elif F_CPU == 8000000UL

	TA0CTL = TASSEL__SMCLK | ID__8 | MC__CONTINUOUS; // /8

	TA0EX0 = 0; // /1 -> /8

#elif F_CPU == 4000000UL

	TA0CTL = TASSEL__SMCLK | ID__4 | MC__CONTINUOUS; // /4

	TA0EX0 = 0; // /1 -> /8

#elif F_CPU == 1000000UL

	TA0CTL = TASSEL__SMCLK | ID__1 | MC__CONTINUOUS; // /1

	TA0EX0 = 0; // /1 -> /8

#else

#error Unsupported F_CPU

#endif /* F_CPU */

	TA0CTL |= TACLR;

#endif

#endif /* TIMER_US */



#if defined(WITH_LOOP) || defined(TIMER_S)

	// 1s per wakeup for loop

	// 1s per wakeup for loop. Independent of SMCLK/F_CPU

	TA1CTL = TASSEL__ACLK | ID__8 | MC__UP;

	TA1EX0 = 0;

	TA1CCR0 = 4096;