关于KL25低功耗的编程问题

wz15996410106 · 发表于 2016-5-18 13:54:19

有没有大神，帮我解释一下下面的KL25低功耗例程中的代码，最好详细点，初学者。万分感谢！int main (void)
{
#ifdef CMSIS
      start();
#endif

      /*Enable all operation modes because this is a write once register*/
      SMC_PMPROT =  SMC_PMPROT_AVLLS_MASK |
                  SMC_PMPROT_ALLS_MASK  |
                  SMC_PMPROT_AVLP_MASK;

      /*PTC3(SW3) is configured to wake up MCU from VLLSx and LLS modes, Interrup is ne*/
      LLWU_Init();
      /*Configure Tower hardware for the application*/
      Port_Init(IO_NMI_DEF);
      SW_LED_Init();
      EnableInterrupts;
      /*Start test*/
      LowPowerModes_test();
}
void LowPowerModes_test(void)
{
  int i;
  unsigned char op_mode,fcrdiv_val;
  int test_num = UNDEF_VALUE;
  int wait_count;
  char test_val;

      while(1)
      {

         while (test_num > 22 | test_num < 0){
            LED0_ON;
            LED1_ON;
            LED2_ON;
            #ifndef FREEDOM
            LED3_ON;
            #endif

            if ((SMC_PMSTAT & SMC_PMSTAT_PMSTAT_MASK)== 4){
                     printf("  in VLPR Mode !  ");
            } else if ((SMC_PMSTAT & SMC_PMSTAT_PMSTAT_MASK)== 1){
                     printf("  in Run Mode  !  ");
            }

printf("\n\r > ");
            test_val = uart0_getchar(UART0_BASE_PTR);
            uart0_putchar(UART0_BASE_PTR,test_val);
            printf("\n\r");

            if((test_val>=0x30) && (test_val<=0x39))
                  test_num = test_val - 0x30;
            if((test_val>=0x41) && (test_val<=0x4C))
                  test_num = test_val - 0x37;
            if((test_val>=0x61) && (test_val<=0x6C))
                  test_num = test_val - 0x57;
            }
         LED0_OFF;
         LED1_OFF;
         LED2_OFF;
#ifndef FREEDOM
         LED3_OFF;

         case 3://LLS loop wake up every 1000 ms
            printf("Press any key to enter LLS with LPTMR 1 Second wakeup loop\n\r ");
            uart0_getchar(UART0_BASE_PTR);
            llwu_configure(0x0000, LLWU_PIN_FALLING, 0x1);
                  LPTMR_init(1000,LPTMR_USE_LPOCLK);
                  printf("Press SW4 to wake up from VLLS2\n\r ");
            for (i=0;i<10;i++)
               {

                  printf("  Entering LLS mode");
                  clockMonitor(OFF);
                  set_4_lp(0);
                  enter_lls();
                  set_4_lp(1);
                  clockMonitor(ON);

                  /*After LLS wake up that was enter from PEE the exit will be on PBE */
                  /*  for this reason after wake up make sure to get back to desired  */
                  /*  clock mode                                                    */
                  op_mode = what_mcg_mode();
                  if(op_mode==PBE)
                  {
                        mcg_clk_hz = pbe_pee(CLK0_FREQ_HZ);
                        uart0_clk_khz = ((mcg_clk_hz / 2) / 1000); // UART0 clock frequency will equal half the PLL frequency
                        uart_configure(uart0_clk_khz,SIM_SOPT2_UART0SRC(1));
                  }
                  printf(" Loop Count 0x%02X ",i) ;
                  printf("  Back in RUN mode \n\r");
                  }
            LPTMR0_CSR &= ~LPTMR_CSR_TEN_MASK;
            break;

case 0x12://VLPR in BLPI 4 MHZ
            /*Maximum clock frequency for this mode is core 4MHz and Flash 1Mhz*/
            printf("Press any key to enter VLPR in BLPI mode \n\r ");
            uart0_getchar(UART0_BASE_PTR);
            printf("Configure clock frequency to 4MHz core clock and 1MHz flash clock\n\r ");
            /*Get out of VLPR to change clock dividers*/
            exit_vlpr();  // get out of VLPR back to RUN
            vlp_clock_config(BLPI);
            // default clock divider is set to divide by 1 of Fast IRC and Div2 for Bus
            SIM_CLKDIV1 = ( SIM_CLKDIV1_OUTDIV1(0)
                              | SIM_CLKDIV1_OUTDIV4(4) );

            fcrdiv_val = (1 << ((MCG_SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT)); // calculate the fast IRC divder factor
            mcg_clk_hz =  (fast_irc_freq / fcrdiv_val); // MCGOUT frequency equals fast IRC frequency divided by 2

            mcg_clk_hz =  mcg_clk_hz / (((SIM_CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> 28)+ 1);
            /*Go to VLPR*/
            enter_vlpr(); // get into VLPR
            if ((SMC_PMSTAT & SMC_PMSTAT_PMSTAT_MASK)== 4){
                     printf("  in VLPR Mode !\n\r ");
            } else if ((SMC_PMSTAT & SMC_PMSTAT_PMSTAT_MASK)== 1){
                     printf("  in Run Mode  !\n\r ");
                  clockMonitor(ON);
            }

            break;

void demo_lptmr_isr(void)
{
  volatile unsigned int dummyread;
  if(MCM_CPO & MCM_CPO_CPOACK_MASK){
   MCM_CPO &= ~MCM_CPO_CPOREQ_MASK;
   while (MCM_CPO & MCM_CPO_CPOACK_MASK);
   printf("       \n\rLPTRM Interrupt pulled OUT of Compute Mode  \n\r");
  }
  SIM_SCGC5 |= SIM_SCGC5_LPTMR_MASK;
  printf(" \r[demo_lptmr_isr] \n\r  > ");

  LPTMR0_CSR |=  LPTMR_CSR_TCF_MASK; // write 1 to TCF to clear the LPT timer compare flag
  LPTMR0_CSR = ( LPTMR_CSR_TEN_MASK | LPTMR_CSR_TIE_MASK | LPTMR_CSR_TCF_MASK  );
   // enable timer
   // enable interrupts
   // clear the flag
  /*wait for write to complete to  before returning */
  dummyread = LPTMR0_CSR;

  return;

void SW_LED_Init(void)
{

#ifdef TOWER
SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTA_MASK ; /* PORT clock enablement */
      LED0_EN; // (PORTA_PCR16 = PORT_PCR_MUX(1))
      GPIOA_PDDR |= (1<<16);

      LED1_EN; // (PORTA_PCR17 = PORT_PCR_MUX(1))
      GPIOA_PDDR |= (1<<17);

      LED2_EN; // (PORTB_PCR8 = PORT_PCR_MUX(1))
      GPIOB_PDDR |= (1<<8);

      LED3_EN; // (PORTA_PCR5 = PORT_PCR_MUX(1))
GPIOA_PDDR |= (1<<5);
#else
SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTD_MASK ; /* PORT clock enablement */

      LED0_EN;
GPIOB_PDDR |= (1<<19);

      LED1_EN;
GPIOB_PDDR |= (1<<18);

      LED2_EN;
GPIOD_PDDR |= 1;
#endif

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