STM32 Power Management



(1) 3: mode

① sleep mode ② stop mode ③ Standby mode

1. Sleep mode: CORTEX-M3 core (understood as CPU) stop working, CPU powered 1.8V has, around any execution. Perform

2. Shutdown mode: All clocks are stopped, CPU power 1.8V is not broken. Run from original location after wake up

3. Standby mode: Clock all off, CPU power 1.8V also broken, wake up after the program run again

Can be the image of the test:

CPU: The Emperor

CPU Power 1.8V: Queen

Peripherals: General

So:

1. Sleep mode: Only the Emperor sleeps

2. Shutdown mode: The Emperor, the general sleeps

3. Standby mode: The Emperor, the Queen. The general is all asleep.

(principle: The Queen does not sleep, the program can be retained, wake up from the original location to run)

(b) Procedure Brief introduction (library function)

1. Sleep mode

while (1)                            {/* wait interrupt */led1 (ON);D Elay (0xFFFFF); LED1 (OFF);  LED2 (on);  Delay (0xFFFFF); LED2 (OFF);  LED3 (on); Delay (0xFFFFF); LED3 (OFF);     __wfi ();}

__wfi (); Go to sleep mode and interrupt wake-up at random. No more clock configuration after wake-up

2. Stop mode

①/* due to the use of its peripheral clock. It needs to be pwr*/.

②/* Enable power management Unit Clock */

Rcc_apb1periphclockcmd (RCC_APB1PERIPH_PWR, ENABLE);

③ Enter stop mode

Pwr_enterstopmode (PWR_REGULATOR_LOWPOWER,PWR_STOPENTRY_WFI);

④ Wakeup: External interrupt

Since the general sleeps, (and the peripheral clock is turned off, so it needs to be configured again) after wake up need to start HSE again

Sysclkconfig_stop ();

void Sysclkconfig_stop (void) {ErrorStatus hsestartupstatus;  /* Enable HSE *  /Rcc_hseconfig (rcc_hse_on);  /* Wait for HSE to be ready *  /Hsestartupstatus = Rcc_waitforhsestartup ();  if (Hsestartupstatus = = SUCCESS)  {/    * Enable PLL *     /Rcc_pllcmd (enable);    /* Wait for the PLL to be ready *    /while (Rcc_getflagstatus (rcc_flag_pllrdy) = = RESET)    {    }/    * Select PLL as the system clock source *    / Rcc_sysclkconfig (RCC_SYSCLKSOURCE_PLLCLK);    /* Wait for the PLL to be selected as the system clock source *    /while (Rcc_getsysclksource ()! = 0x08)    {    }  }}

3. Standby mode

①/* due to the use of its peripheral clock, etc., it needs to pwr*/

②/* Enable power management Unit Clock */

Rcc_apb1periphclockcmd (RCC_APB1PERIPH_PWR, ENABLE);

③ into Standby mode

/* Enable the Wkup pin wake-up function, Wkup is the second function. Do not configure its output mode (not too understand) */pwr_wakeuppincmd (ENABLE);/* Enter Standby mode */pwr_enterstandbymode ();

④ Wakeup, reset wakeup. PA0 Rising Edge Wake Up

⑤ detection is reset wakeup or PA0 rising edge wake Up

if (Pwr_getflagstatus (pwr_flag_wu) = = SET) {printf ("\ r \ n PA0 rising edge wake \ r \ n");} else printf ("\ r \ n other \ r \ n");

Since the standby wakeup program runs from the beginning, it is not necessary to configure the clock function.

A madman with a brain

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STM32 Power Management