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Shahriar Sayeed
Shahriar Sayeed
Associate
March 4, 2017
Question

Where are _IRQHandler functions defined?

  • March 4, 2017
  • 5 replies
  • 2279 views
Posted on March 04, 2017 at 16:13

Ok so I am talking about the IRQ handlers for ADC, SPI, I2C USART etc..

I am expecting to see weak definitions of ADC_IRQHandler() function for example somewhere...but my startup_stm32.s file in startup directory does not know these functions...

I am using the System Workbench for STM32.

I only see the following:

.weak NMI_Handler

.thumb_set NMI_Handler,Default_Handler

.weak HardFault_Handler

.thumb_set HardFault_Handler,Default_Handler

.weak MemManage_Handler

.thumb_set MemManage_Handler,Default_Handler

.weak BusFault_Handler

.thumb_set BusFault_Handler,Default_Handler

.weak UsageFault_Handler

.thumb_set UsageFault_Handler,Default_Handler

.weak SVC_Handler

.thumb_set SVC_Handler,Default_Handler

.weak DebugMon_Handler

.thumb_set DebugMon_Handler,Default_Handler

.weak PendSV_Handler

.thumb_set PendSV_Handler,Default_Handler

.weak SysTick_Handler

.thumb_set SysTick_Handler,Default_Handler

Can someone help?

    This topic has been closed for replies.

    5 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    March 4, 2017
    Posted on March 04, 2017 at 19:16

    The body code is typically in stm32fxyz_it.c and the table with weak definitions is in startup_stm32fxyz.s, or the linker script. The weak linkage is sufficient for unused vectors, you're expected to put handler code in your own .C files.

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    Shahriar Sayeed
    Shahriar SayeedAuthor
    Associate
    March 6, 2017
    Posted on March 06, 2017 at 06:01

    Ok first of all I am new to ST micro devices and the system workbench. However I am well familiar with Atmel microcontrollers and their ARM ranges. I am still struggling to find out more about these _IRQHandler functions...

    I created a project in SystemWorkbench there is no stm32fxyz_it.c file I see the 'stm32f4xx_it.h' however under /inc directory.

    Inside this header file there exists only the following function definitions:

    void NMI_Handler(void);

    void HardFault_Handler(void);

    void MemManage_Handler(void);

    void BusFault_Handler(void);

    void UsageFault_Handler(void);

    void SVC_Handler(void);

    void DebugMon_Handler(void);

    void PendSV_Handler(void);

    void SysTick_Handler(void);

    So where are the definitions (or even the weak ones) for example ADC_IRQHandler()?

    As mentioned above they DO NOT exist in 'startup_stm32.s'. In this file also the 'g_pfnVectors' table shows as follows:

     g_pfnVectors:

    .word _estack

    .word Reset_Handler

    .word NMI_Handler

    .word HardFault_Handler

    .word MemManage_Handler

    .word BusFault_Handler

    .word UsageFault_Handler

    .word 0

    .word 0

    .word 0

    .word 0

    .word SVC_Handler

    .word DebugMon_Handler

    .word 0

    .word PendSV_Handler

    .word SysTick_Handler

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

    .word 0

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    .word 0

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    .word 0

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    .word 0

    .word 0

    .word 0

    .word 0

    .word 0
    Tesla DeLorean
    Tesla DeLorean
    Guru
    March 6, 2017
    Posted on March 06, 2017 at 14:29

    You'll observe you didn't specify a part in your original post, STM32 covers hundreds of different parts. The body code is frequently placed in stm32f4xx_it.c, but can be anywhere in your compiled code.

    It would appear that you are using a generic startup_stm32.s rather than a part specific startup_stm32f401xx.c type file, and your vector table only contains the system handlers common to Cortex-M3/M4 parts. Check why your chosen tool chain does this, I'm not using it.

    STM32F4xx_DSP_StdPeriph_Lib_V1.8.0\Libraries\CMSIS\Device\ST\STM32F4xx\Source\Templates\SW4STM32\startup_stm32f427_437xx.s

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    nichtgedacht
    nichtgedacht
    Associate III
    March 6, 2017
    Posted on March 06, 2017 at 20:13

    Hi

    In all my CubeMX projects generated for 'System Workbench for STM32'  the missing weak definitions can be found in

    startup/startup_stm32xxxxx.s.

    In Src/stm32l4xx_it.c and Inc/stm32l4xx_it.h only the used functions exists.

    There must be something wrong with your setup.

    How did you import the project to SW4STM32?

    I use the generated directory as workspace, which contains the project folder. Then Import: General -> 'Existing Projects into Workspace'  and poimt to the generated Dir above project folder. That is the default if you click on browse.

    Dieter

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