TM4C123GH6PM: can not access the systick handeler

Hi,

  - If the code is intending to generate a systick interrupt then I don't see the systick vector declared in the vector table. On line 85 of the vector table, it is pointing to IntDefaultHandler instead of a specific systick ISR. 

- There is a systick example in TivaWare library. You can find in C:\ti\TivaWare_C_Series-2.2.0.295\examples\peripherals\systick. The example configures the systick to generate interrupt every 1s. 

- The code you show is custom driver. Any reason not using the proven TivaWare peripheral drivers? I will suggest you compare your driver with the TivaWare. 

Hello Charles,

Good day and thank you for this response.

My customer provided a reply below:

in the tm4c123gh6pm_startup_ccs.obj file when i replaced IntDefaultHandler with SysTickIntHandler for define it in the vector table it give me error.

Regards,

Renan

Hi Renan,

Renan Santos Adriano said:

in the tm4c123gh6pm_startup_ccs.obj file when i replaced IntDefaultHandler with SysTickIntHandler for define it in the vector table it give me error.

  Can you be more specific on what error? Are you getting a compiler/linker error? You declare the SysTickIntHandler in the vector table but do you have this ISR function defined in your source file?

  Did you have a chance to run the systick example that I mentioned? 

Hello Charles,

Please see my customer response below:

i update the code to replace IntDefaultHandler with SysTickIntHandler in tm4c123gh6pm_startup_ccs.c for define it in the vector table it give me "error #20: identifier "SysTickIntHandler" is undefined". there is some thing else.please check the code.

GPIO_TEST6_2.rar

Thank you in advance

Regards,

Renan

Renan Santos Adriano said:

i update the code to replace IntDefaultHandler with SysTickIntHandler in tm4c123gh6pm_startup_ccs.c for define it in the vector table it give me "error #20: identifier "SysTickIntHandler" is undefined".

The tm4c123gh6pm_startup_ccs.c needs a declaration for the SysTickIntHandler function.

Try adding:

//*****************************************************************************
//
// External declarations for the interrupt handlers used by the application.
//
//*****************************************************************************
void SysTickIntHandler(void);

 Hello Charles,

Please see my customer response below:

I update the code as you mention but i had new error ""../main.c", line 10: fatal error #1965: cannot open source file " tm4c123gh6pm_startup_ccs.h"" the problem still remain.

Thank you in advance

Regards,

Renan

Hi Renan,

  I don't understand why you rejected Chester's answer who is our community contributor without first verifying his solution is correct. First of all, there is no such file as tm4c123gh6pm_startup_ccs.h but rather the tm4c123gh6pm_startup_ccs.c file instead. I simply added the below line as suggested by Chester to the tm4c123gh6pm_startup_ccs.c and everything compiles fine. 

extern void SysTickIntHandler(void);

Here is the modified project. 

GPIO_TEST6.zip

Hello Carles,

Thank you for this response. We already fix systick handler but still face issues. the code
SYSTICK_SINGLE_INTERVAL(50000000 , fun );
when i put it in while (1){......}
it did not work to periodically perform fun code as time end .it loop without entering handler but it work when t put this code before while(1) 

Thanks in advance.

Regards,

Renan

When you are in while (1) you keep reinitializing the systick timer by calling SYSTICK_SINGLE_INTERVAL repeatedly. The timer is reinitialized to preload value of 50000000 constantly. Before it has a chance to count down to 0 to generate an interrupt, it is reinitialized again to 50000000 . That is why it didn't work. 

I think Chester and I have already solved your original question. If you have new question, please open a new thread instead continuing on the same thread for different questions. This is to not to clutter the threads per forum guideline.