【求助】KL03不能进入VLPS状态

siemens_cool · 发表于 2015-8-10 20:43:07

用KL03做低功耗，但是始终不能进入VLPS状态，设置如下：时钟源为LIRC8M，FCRDIV=1，OUTDIV1=1，OUTDIV4=3，LIRC_DIV2=0.即core_clk=2MHz,bus/Flash clock=1MHz.
vlpr函数：
void enter_vlpr(void)
{
SMC_PMPROT = SMC_PMPROT_AVLP_MASK;
   SMC_PMCTRL &= ~SMC_PMCTRL_RUNM_MASK;
   SMC_PMCTRL  |= SMC_PMCTRL_RUNM(0x2);
}

void enter_vlps(void)
{
SMC_PMPROT = SMC_PMPROT_AVLP_MASK;
      SMC_PMCTRL |= SMC_PMCTRL_STOPM(2);
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
dummyRead = SMC_PMSTAT;
__WFI();

}

int main(void)
{
SIM->SCGC5 |= (1UL <<  10);
PORTB->PCR[13] = PORT_PCR_MUX(0x01);
FPTB->PDDR = FGPIO_PDDR_PDD(1<<13);
enter_vlpr();
enter_vlps();
while(1)
{
FPTB->PSOR = FGPIO_PSOR_PTSO(1<<13);
delay_ms(10);
FPTB->PCOR = FGPIO_PCOR_PTCO(1<<13);
delay_ms(10);
}

现象是LED时钟会持续闪烁，也就是没有进入VLPS状态，请教FSL，配置哪里出错了，多谢。

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FSL_FAE_YDW · 发表于 2015-8-10 23:35:25

请看如下标准的写法：
void enter_vlps(void)
{
  volatile unsigned int dummyread;
  /* The PMPROT register may have already been written by init code
   If so then this next write is not done since
   PMPROT is write once after RESET
   allows the MCU to enter the VLPR, VLPW, and VLPS modes.
   If AVLP is already writen to 0
   Stop is entered instead of VLPS*/
  SMC_PMPROT = SMC_PMPROT_AVLP_MASK;
  /* Set the STOPM field to 0b010 for VLPS mode */
  SMC_PMCTRL &= ~SMC_PMCTRL_STOPM_MASK;
  SMC_PMCTRL |=  SMC_PMCTRL_STOPM(0x2);
  /*wait for write to complete to SMC before stopping core */
  dummyread = SMC_PMCTRL;
  dummyread++;
  /* Now execute the stop instruction to go into VLPS */
  #ifdef CMSIS
  /* Set the SLEEPDEEP bit to enable deep sleep mode (STOP) */
  SCB_SCR |= SCB_SCR_SLEEPDEEP_MASK;
  __wfi();
#else
  stop();
#endif
}

另外进入VLPS前关掉clock monitor
void clockMonitor(unsigned char state)
{
if(state)
   MCG_C6 |= MCG_C6_CME0_MASK;
else
   MCG_C6 &= ~MCG_C6_CME0_MASK;
}