stm32f4 __wfi

[Jython]

sleep function at the ending of loop, the loop did not begin intermediate

On Thursday, June 20, 2019, Christian Mauderer <list at c-mauderer.de> wrote:

> On 20/06/2019 13:25, Jython wrote:
> > do have service routine,  handler can printk log,  SLEEPONEXIT is 0
>
> So your handler is called? But it seems that the processor wakes up
> then. How does the "won't stop sleep mode" look like?
>
> >
> > On Thu, Jun 20, 2019 at 5:19 PM Christian Mauderer <list at c-mauderer.de
> > <mailto:list at c-mauderer.de>> wrote:
> >
> >     On 20/06/2019 10:57, Jython wrote:
> >     > a GPIO EXTI line,
> >     > rtems idle phrase called __wfi, does it make stm32 enter standby
> mode?
> >     > so key can not wake up it from sleep function
> >
> >     Please take a look at the reference manual of your chip. Most likely
> >     it's "RM0090 Rev 18" but make sure that's the right part number:
> >
> >         https://www.st.com/resource/en/reference_manual/dm00031020.pdf
> >
> >     On page 127 there is a description of "Entering low-power mode":
> >
> >         "Low-power modes are entered by the MCU by executing the WFI
> (Wait
> >         For Interrupt), or WFE (Wait for Event) instructions, or when the
> >         SLEEPONEXIT bit in the Cortex ®-M4 with FPU System Control
> >         register is set on Return from ISR."
> >
> >     There is also a description for "Exiting low-power mode". For WFI
> "any
> >     peripheral interrupt acknowledged by the NVIC can wake up the
> device."
> >     So your interrupt has to be set up.
> >
> >     Your code seems to enable the interrupt. But have you registered a
> >     interrupt service routine? Otherwise you might get problems with an
> >     unhandled interrupt on wakeup.
> >
> >     I only skimmed through the power controller chapter. But it seems
> that
> >     if you have SLEEPDEEP bit set, you will enter a deeper sleep mode
> >     where peripheral clocks can be disabled. In that state it's possible
> >     that only special pins (like the WKUP) can wake up the processor
> >     again. Please have a detailed look at that chapter to find out all
> >     traps.
> >
> >     Best regards
> >
> >     Christian
> >
> >     >
> >     >
> >     >     void keys_init()
> >     >     {
> >     >         // config gpio
> >     >     stm32f4_gpio_set_config(&io_key1);  // PA12
> >     >     stm32f4_gpio_set_config(&io_key2);
> >     >         stm32f4_gpio_set_config(&io_key3);
> >     >     stm32f4_gpio_set_config(&io_key4);
> >     >
> >     >
> >     >         //  SYSCFGEN and exit map
> >     >     (*(uint32_t*)0x40023844) |= 1<<14;
> >     >
> >     >         SYSCFG_EXTICR3 = 0;
> >     >         SYSCFG_EXTICR4 = 0;
> >     >
> >     >
> >     >
> >     >         // EXIT INIT
> >     >     EXTI_IMR |= (1<<12);
> >     >     EXTI_RTSR |= (1<<12);
> >     >
> >     >         EXTI_IMR |= (1<<11);
> >     >     EXTI_RTSR |= (1<<11);
> >     >
> >     >         EXTI_IMR |= (1<<10);
> >     >     EXTI_RTSR |= (1<<10);
> >     >
> >     >         EXTI_IMR |= (1<<9);
> >     >     EXTI_RTSR |= (1<<9);
> >     >
> >     >
> >     >         //NVIC_Init
> >     >         //NVIC it group2
> >     >
> >     >     SCB_AIRCR = 0x05FA0000 | 0x500;
> >     >     // ip Interrupt priority register x
> >     >
> >     >     //(*(volatile uint8_t*)0xE000E417) = 0xe0;  //23
> >     >         //(*(volatile uint8_t*)0xE000E428) = 0xe0;  // 40
> >     >         (*(volatile uint8_t*)0xE000E417) = 0x50;  //23
> >     >         (*(volatile uint8_t*)0xE000E428) = 0x50;  // 40
> >     >
> >     >
> >     >
> >     >     // 23 40 Interrupt set-enable register x (NVIC_ISERx)
> >     >         // nvic enable interrupter number
> >     >         // 0xE000E100
> >     >         (*(volatile uint32_t*)0xE000E100) |= (1<<23);
> >     >         (*(volatile uint32_t *)0xE000E104) |= (1<< (40%32));
> >     >     }
> >     >
> >     >
> >     > On Thu, Jun 20, 2019 at 4:05 PM Christian Mauderer
> >     <list at c-mauderer.de <mailto:list at c-mauderer.de>
> >     > <mailto:list at c-mauderer.de <mailto:list at c-mauderer.de>>> wrote:
> >     >
> >     >     On 20/06/2019 05:28, Jython wrote:
> >     >     > hi, it seems that exit key interrupt won't stop sleep mode,
> why?
> >     >     >
> >     >     > [...]
> >     >     >
> >     >
> >     >     What do you mean by "exit key interrupt"? I don't know the
> >     STM32F4 that
> >     >     well. So please give some more details.
> >     >
> >     >     I would expect that either only specific interrupt sources can
> >     wake up
> >     >     the processor from a deep sleep mode or that you can configure
> >     which
> >     >     peripherals are still active. If your "exit key" is a GPIO
> >     line with
> >     >     interrupt capability you should have a look at whether the
> >     module is
> >     >     still active.
> >     >
> >     >     Best regards
> >     >
> >     >     Christian
> >     >
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> >     >
> >
>
>
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