Data Watch-point and Trace unit(DWT) interface.
Diff: Dwt.cpp
- Revision:
- 0:37014c6bb5cd
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Dwt.cpp Sun Oct 08 05:51:12 2017 +0000 @@ -0,0 +1,97 @@ + +#include <mbed.h> +#include "Dwt.h" + +const uint32_t Dwt::DWT_REGS_ADDR = 0xe0001000; +const uint32_t Dwt::SCB_DEMCR_ADDR = 0xe000edfc; + +const uint32_t Dwt::NUMCOMP_POS = 28; +const uint32_t Dwt::NUMCOMP_MASK = (0xfU << Dwt::NUMCOMP_POS); +const uint32_t Dwt::NOTRCPKT = (1 << 27); +const uint32_t Dwt::NOEXTTRIG = (1 << 26); +const uint32_t Dwt::NOCYCCNT = (1 << 25); +const uint32_t Dwt::NOPRFCNT = (1 << 24); + +const uint32_t Dwt::CYCEVTENA = (1 << 22); +const uint32_t Dwt::FOLDEVTENA = (1 << 21); +const uint32_t Dwt::LSUEVTENA = (1 << 20); +const uint32_t Dwt::SLEEPEVTENA = (1 << 19); +const uint32_t Dwt::EXCEVTENA = (1 << 18); +const uint32_t Dwt::CPIEVTENA = (1 << 17); +const uint32_t Dwt::EXCTRCENA = (1 << 16); +const uint32_t Dwt::PCSAMPLENA = (1 << 12); +const uint32_t Dwt::CYCCNTENA = (1 << 0); + +const uint32_t Dwt::TRCENA = (1 << 24); + +const uint32_t Dwt::EVENA_MASK = Dwt::CYCEVTENA | Dwt::FOLDEVTENA | Dwt::LSUEVTENA | Dwt::SLEEPEVTENA | + Dwt::EXCEVTENA | Dwt::CPIEVTENA | Dwt::EXCTRCENA | Dwt::PCSAMPLENA | + Dwt::CYCCNTENA; + + + +Dwt::Dwt() +{ + _regs = (volatile dwt_regs_t *)DWT_REGS_ADDR; + _scb_demcr_regs = (volatile uint32_t *)SCB_DEMCR_ADDR; +} + +bool +Dwt::isTRCPKT_Available() +{ + return((_regs->DWT_CTRL & NOTRCPKT) == 0); +} + + +bool +Dwt::isEXTTRIG_Available() +{ + return((_regs->DWT_CTRL & NOEXTTRIG) == 0); +} + +bool +Dwt::isCYCCNT_Available() +{ + return((_regs->DWT_CTRL & NOCYCCNT) == 0); +} + +bool +Dwt::isPRFCNT_Available() +{ + return((_regs->DWT_CTRL & NOPRFCNT) == 0); +} + +void +Dwt::enableCYCCNT() +{ + *_scb_demcr_regs |= TRCENA; +} + +void +Dwt::disableCYCCNT() +{ + *_scb_demcr_regs &= ~TRCENA; +} + +void +Dwt::setEvent(uint32_t ev) +{ + uint32_t tmp; + tmp = _regs->DWT_CTRL; + tmp &= ~EVENA_MASK; + tmp |= ev & EVENA_MASK; + _regs->DWT_CTRL = tmp; +} + +/// ICNT = CNT_CYCLES + CNT_FOLD - (CNT_LSU + CNT_EXC + CNT_SLEEP + CNT_CPI) +uint32_t +Dwt::getInstructionCount() +{ + uint32_t cnt_cycles = getCYCCNT(); + uint32_t cnt_fold = getFOLDCNT(); + uint32_t cnt_lsu = getLSUCNT(); + uint32_t cnt_exc = getEXCCNT(); + uint32_t cnt_sleep = getSLEEPCNT(); + uint32_t cnt_cpi = getCPICNT(); + return(cnt_cycles + cnt_fold - (cnt_lsu + cnt_exc + cnt_sleep + cnt_cpi)); +}