Hi,
I've got a problem with STM32L071 and SysTick. I got a two programs written for this MCU - bootloader and the main app.
The bootloader uses HAL dirven with SysTick. Standard SysTick_Handler() function is responsible for handling the interrupts coming from Systick. After the MCU startup I check some things in the bootloader and then make a jump to the main app. Before the jump I disable all interrupts using __disable_irq();, but I don't turn off the Systick. Unfortunately I can't make any changes in the bootloader.
In the main app I use TIM6 to drive HAL, because I use SysTick for driving the FreeRTOS. Function resposible for handling the interrupts from SysTick is xPortSysTickHandler(). In main() I do the HAL_Init() and __enable_irq();. After that the SysTick generates an interrupt that calls xPortSysTickHandler() which leads to HardFault.
I think the reason of the HardFault is that I call xPortSysTickHandler() before I manage to initialize the FreeRTOS. I tried to diable the SysTick using following lines of code:
SysTick->CTRL &= ~(SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_TICKINT_Msk |
SysTick_CTRL_ENABLE_Msk);
SCB->ICSR |= SCB_ICSR_PENDSVCLR_Msk | SCB_ICSR_PENDSTCLR_Msk;
Even with this in the beginning of the main() I get the interrupt from SysTick, which leads straight to HardFault. Is there any other way to disable the SysTick?
Regards,
Piotr
