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May 30, 2018
Question

Real USART2 INT number

  • May 30, 2018
  • 2 replies
  • 1391 views
Posted on May 30, 2018 at 21:44

USART2 INT number # 26 instead of #

I'm building a new project that involve FreRTOS and USART2, when enabling the interruption for the USART2, (Configuration-> USART2 configuration->NVIC Settings) the application shows USART2 Global Interrupt / USART2 wake-up interrupt through EXTI line

i'm missing something here? the real int number for USART2 is not 28?

the code is generated with int number 28, reference manual andstm32l051xx.h point to .

here is about the environment:

STM32CubeMx 4.25, STM32Cube V1.0,Atollic TrueSTUDIO® for STM32, Built on Eclipse Neon.1a.,Version: 9.0.0,Build id: 20180117-1023

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    2 replies

    Tilen MAJERLE
    Tilen MAJERLE
    ST Employee
    May 30, 2018
    Posted on May 30, 2018 at 21:58

    Hello,

    for NVIC, value 28 is index where interrupt is served. Before that, there is EXTI part of STM32 and it is mapped to 26 in this block.

    Which MCU part number do you use?

    Best regards,

    Tilen

    waclawek.jan
    waclawek.jan
    Super User
    May 30, 2018
    Posted on May 30, 2018 at 22:22

     ,

     ,

    Tilen,

    If interrupt ♯ 28 is the EXTI26 interrupt, which is presumably tied to the USART2's wakeup facility (i.e. USART_ISR.WUF), what's the interrupt number of the USART2, ie. the other USART_ISR flags?

    Thanks,

    JW

    Tilen MAJERLE
    Tilen MAJERLE
    ST Employee
    May 30, 2018
    Posted on May 30, 2018 at 23:35

    Hello Jan,

    ♯ 28 is for USART. This one is also served via EXTI to allow MCU wakeup from low-power modes. Similar to RTC.

    RM0377, Table 53.

    Best regards,

    Tilen

    ilde
    ildeAuthor
    Associate
    May 30, 2018
    Posted on May 30, 2018 at 22:13

    Thanks for the info, i'm using an ST32L051C8T3..

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