# I am using FreeRTOS with STM32G0 series. I created two tasks in the beginning it goes to two task but after couple of times it always stuck in one task **URL:** \ **Category:** Kernel\ **Created:** [March 3, 2021, 3:24am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888 "2021-03-03T03:24:17Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![anunalge](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@anunalge](https://forums.freertos.org/u/anunalge)\ **Post date:** [March 3, 2021, 3:24am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/1 "2021-03-03T03:24:17Z")
FreeRTOS task has been stuck with one of them not going to other task. I used STCube to generate the code and created two tasks, i assume idle task is created by RTOS so i have not done. In the beginning it run both the tasks but after 3 or 4 times it always stuck in one task. I am new to using FreeRTOS . Please guide me. ---
**Author:** ![jefftenney](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/jefftenney/32/1314_2.png) [@jefftenney](https://forums.freertos.org/u/jefftenney)\ **Post date:** [March 3, 2021, 4:30am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/2 "2021-03-03T04:30:07Z")
Here are a few “basics” that have helped many new users. Be sure you have [configASSERT()](https://www.freertos.org/a00110.html#configASSERT) defined and that you enable [stack overflow checking](https://www.freertos.org/Stacks-and-stack-overflow-checking.html) and use the [malloc-failed hook](https://www.freertos.org/a00110.html#configUSE_MALLOC_FAILED_HOOK). And with Cortex M, the FAQ is especially helpful: > **[FreeRTOS - Open Source RTOS Kernel for small embedded systems](https://freertos.org/FAQHelp.html)** > > FreeRTOS is a portable, open source, mini Real Time kernel. A free RTOS for small embedded systems ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [March 3, 2021, 5:35am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/3 "2021-03-03T05:35:41Z")
If you are generating your project using STM32CubeIDE, another thing to keep in mind to change the HAL Tick from SysTick to some other timer (say TIM6): `System Core --> SYS --> Timebase Source`. Thanks. ---
**Author:** ![anunalge](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@anunalge](https://forums.freertos.org/u/anunalge)\ **Post date:** [March 3, 2021, 6:43am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/4 "2021-03-03T06:43:16Z")
/\*\*\*\*\*\* Cortex-M0+ Processor Exceptions Numbers \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*_/ NonMaskableInt\_IRQn = -14, /_!\< 2 Non Maskable Interrupt _/ HardFault\_IRQn = -13, /_!\< 3 Cortex-M Hard Fault Interrupt _/ SVC\_IRQn = -5, /_!\< 11 Cortex-M SV Call Interrupt _/ PendSV\_IRQn = -2, /_!\< 14 Cortex-M Pend SV Interrupt _/ SysTick\_IRQn = -1, /_!\< 15 Cortex-M System Tick Interrupt \*/ These are generated by STMCube. /\* System interrupt init\*/ /\* PendSV\_IRQn interrupt configuration \*/ HAL\_NVIC\_SetPriority(PendSV\_IRQn, 3, 0); this function is called in HAL\_MspInit. Is this is an issue? Memory i am using dynamic allocation so the issue may not be related to stack. ---
**Author:** ![anunalge](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@anunalge](https://forums.freertos.org/u/anunalge)\ **Post date:** [March 3, 2021, 6:44am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/5 "2021-03-03T06:44:06Z")
I am using TIM6 as time base for HAL ---
**Author:** ![hs2](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@hs2](https://forums.freertos.org/u/hs2)\ **Post date:** [March 3, 2021, 8:42am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/6 "2021-03-03T08:42:40Z")
I afraid a few more details are needed to help. Could you post the code of the tasks and where exactly the task is stuck ? And also the code where you create the tasks ? Did you already take care about Jeff’s hints ? I also strongly recommend doing so during development. ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 8, 2022, 4:20pm UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/7 "2022-11-08T16:20:26Z")
.Error: L6218E: Undefined symbol vApplicationStackOverflowHook(tskTaskControlBlock\*, char\*) (referred from tasks.o). the above error pops up if i enable the stack overflow checking and similar when i enable the malloc-failed hook ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 8, 2022, 4:20pm UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/8 "2022-11-08T16:20:59Z")
is there a way to resolve that ---
**Author:** ![rtel](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/rtel/32/31_2.png) [@rtel](https://forums.freertos.org/u/rtel)\ **Post date:** [November 8, 2022, 4:23pm UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/9 "2022-11-08T16:23:39Z")
Functions prefixed with “Application” must be provided by the application writer - in this case it is the function the kernel should call when it detects a stack overflow. If googling vApplicationStackOverlowHook doesn’t immediately provide the answer to your question, then try restricting your google search to the FreeRTOS website by adding “site:FreeRTOS.org” to the end of the search query. ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [November 8, 2022, 4:58pm UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/10 "2022-11-08T16:58:25Z")
Documentation - [FreeRTOS - stacks and stack overflow checking](https://www.freertos.org/Stacks-and-stack-overflow-checking.html) Example - [FreeRTOS/app\_main.c at main · FreeRTOS/FreeRTOS · GitHub](https://github.com/FreeRTOS/FreeRTOS/blob/main/FreeRTOS/Demo/CORTEX_MPU_M7_NUCLEO_H743ZI2_GCC_IAR_Keil/Demo/app_main.c#L49) ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 8:22am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/11 "2022-11-14T08:22:25Z")
I have added whatever is told and i still get the SVC 0 hard fault , any other workaround perhaps ? While this is discussed is freeRTOS not compatible with a project which has cpp files ? when i try to add RTOS to my project (which has cpp files ) there is a lot of errors which comes up , i’m using keil micro vision IDE . I have even tried changing the Misc controls of only cpp files to “–cpp11” but still no luck . I had to change some of the freeRTOS files which were giving errors to work with “–cpp11” to make it compile with out errors , which is why i think i am even getting this above SVC hard fault . I’m using the STM32F767 cortexM7 board. ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [November 14, 2022, 9:12am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/12 "2022-11-14T09:12:16Z")
> [@Varsh\_S](#): > > While this is discussed is freeRTOS not compatible with a project which has cpp files ? Are you compiling files using a C compiler? > [@Varsh\_S](#): > > I have added whatever is told and i still get the SVC 0 hard fault , any other workaround perhaps ? Where do you get this hard fault? Can you share callstack when the fault happens? ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 9:38am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/13 "2022-11-14T09:38:31Z")
when i go into the prvStartFirstTask(); in port.c and reach SVC 0 - it doesn’t go further than this ![image](https://d2v6vdsk2p900z.cloudfront.net/original/2X/8/8a813723b7509e860554eb92c13743e258074baa.png) ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 9:39am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/14 "2022-11-14T09:39:15Z")
![image](https://d2v6vdsk2p900z.cloudfront.net/original/2X/7/71bd4fc4d00135aad3d4c78065e30c450be14e3a.png) Arm Compiler - default compiler version 5 ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [November 14, 2022, 9:48am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/15 "2022-11-14T09:48:57Z")
Is [vPortSVCHandler](https://github.com/FreeRTOS/FreeRTOS-Kernel/blob/main/portable/RVDS/ARM_CM4F/port.c#L245) installed as the SVC handler? > [@Varsh\_S](#): > > Arm Compiler - default compiler version 5 You need to ensure that C++ files are compiled using C++ compiler and C files are compiled using C compiler. For GNU, these translate to g++ and gcc respectively. ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 9:52am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/16 "2022-11-14T09:52:09Z")
i have defined the below in freeRTOSconfig.h already - if that is what installing vPostSVCHandler as SVC handler means /\* Definitions that map the FreeRTOS port interrupt handlers to their CMSIS standard names. \*/ #define vPortSVCHandler SVC\_Handler #define xPortPendSVHandler PendSV\_Handler /\* IMPORTANT: FreeRTOS is using the SysTick as internal time base, thus make sure the system and peripherials are using a different time base (TIM based for example). \*/ #define xPortSysTickHandler SysTick\_Handler ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 9:56am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/17 "2022-11-14T09:56:09Z")
I tried adding --cpp11 in the Misc controls section of the “C/C++” only for the C++ files and removed it for all the C files . is there any other way to ensure that the files are compiled using the right compiler ? ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [November 14, 2022, 9:59am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/18 "2022-11-14T09:59:14Z")
> [@Varsh\_S](#): > > i have defined the below in freeRTOSconfig.h already - if that is what installing vPostSVCHandler as SVC handler means Take a look at the vector table which must be in the startup code - is it contains entries SVC\_Handler, then you are likely right. ---
**Author:** ![Varsh\_S](https://avatars.discourse-cdn.com/v4/letter/v/90db22/32.png) [@Varsh\_S](https://forums.freertos.org/u/Varsh_S)\ **Post date:** [November 14, 2022, 10:21am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/19 "2022-11-14T10:21:57Z")
![image](https://d2v6vdsk2p900z.cloudfront.net/original/2X/6/6c06167dbed018585bd1504fbac426b2a74637fe.png) in startup file ---
**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\ **Post date:** [November 14, 2022, 11:24am UTC](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888/20 "2022-11-14T11:24:31Z")
That seems correct. When you try to step through the code, does the control take you to this function? [Next page](https://forums.freertos.org/t/i-am-using-freertos-with-stm32g0-series-i-created-two-tasks-in-the-beginning-it-goes-to-two-task-but-after-couple-of-times-it-always-stuck-in-one-task/11888.md?page=2)