diff options
| author | Daniel Friesel <daniel.friesel@uos.de> | 2019-10-28 11:53:19 +0100 |
|---|---|---|
| committer | Daniel Friesel <daniel.friesel@uos.de> | 2019-10-28 11:53:19 +0100 |
| commit | 6693c0149a787063a4726815344e4f9276b78845 (patch) | |
| tree | 56ea2f2c951a847702ec04f60f261787d9a42957 /src/arch | |
| parent | 46c68f5d29c2cc8871486ee2a2e46d204c6f8047 (diff) | |
MSP430FR5994: Add .arch.sleep_ms (energy-efficient delay_ms variant)
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/msp430fr5994lp/arch.cc | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/arch/msp430fr5994lp/arch.cc b/src/arch/msp430fr5994lp/arch.cc index 3f0eb3c..c6739dd 100644 --- a/src/arch/msp430fr5994lp/arch.cc +++ b/src/arch/msp430fr5994lp/arch.cc @@ -125,6 +125,39 @@ void Arch::delay_ms(unsigned int const ms) } } +volatile bool sleep_done = false; + +// max delay: 2621 ms +void Arch::sleep_ms(unsigned int const ms) +{ + sleep_done = false; +#if F_CPU == 16000000UL + TA3CTL = TASSEL__SMCLK | ID__8; // /8 + TA3EX0 = 7; // /8 -> /64 (250 kHz) +#elif F_CPU == 8000000UL + TA3CTL = TASSEL__SMCLK | ID__8; // /8 + TA3EX0 = 3; // /4 -> /32 (250 kHz) +#elif F_CPU == 4000000UL + TA3CTL = TASSEL__SMCLK | ID__4; // /4 + TA3EX0 = 3; // /4 -> /16 (250 kHz) +#elif F_CPU == 1000000UL + TA3CTL = TASSEL__SMCLK | ID__1; // /1 + TA3EX0 = 3; // /4 -> /4 (250 kHz) +#else +#error Unsupported F_CPU +#endif /* F_CPU */ + TA3CCR0 = ms * 250; + TA3CCTL0 = CCIE; + TA3CTL |= MC__UP | TACLR; + while (!sleep_done) { + asm volatile("nop"); + __bis_SR_register(GIE | LPM2_bits); + asm volatile("nop"); + __dint(); + } + TA3CTL = TASSEL__SMCLK; +} + void Arch::idle_loop(void) { while (1) { @@ -162,6 +195,7 @@ Arch arch; #include "driver/uptime.h" #ifndef __acweaving +// overflow interrupts end up in A1 (joint interrupt for CCR1 ... CCR6 and overflow) __attribute__((interrupt(TIMER1_A1_VECTOR))) __attribute__((wakeup)) void handle_timer1_overflow() { if (TA1IV == 0x0e) { @@ -176,3 +210,11 @@ __attribute__((interrupt(TIMER1_A1_VECTOR))) __attribute__((wakeup)) void handle #endif #endif /* defined(WITH_LOOP) || defined(TIMER_S) */ + +#ifndef __acweaving +// CCR0 interrupts are exclusive to A0 +__attribute__((interrupt(TIMER3_A0_VECTOR))) __attribute__((wakeup)) void handle_timer3_ccr0() +{ + sleep_done = true; +} +#endif /* __acweaving */ |