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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [December 2010 Threads] Problem with vPortStartFirstTask on CM3 and KPosted by Kasper on December 23, 2010 Hi I have tried to get the freeRTOS running on a STM32F100R4, there is no excact demoes for this target, but I have tried to set it up manually, It Compiles fine, but efter calling the vPortStartFirstTask in the port.c file everything seems to stop. The systemTick counter is running, but if I break the program, the debugger stops, and give me and error. I can single step down to the last command in the function, but when execute the scv 0, the debugger stops.
I have add some lines to the standadt startup file startup_stm32f10x_ld_vl.s
IMPORT xPortPendSVHandler IMPORT xPortSysTickHandler IMPORT vPortSVCHandler
; Vector Table Mapped to Address 0 at Reset AREA RESET, DATA, READONLY EXPORT __Vectors EXPORT __Vectors_End EXPORT __Vectors_Size
__Vectors DCD __initial_sp ; Top of Stack DCD Reset_Handler ; Reset Handler DCD NMI_Handler ; NMI Handler DCD HardFault_Handler ; Hard Fault Handler DCD MemManage_Handler ; MPU Fault Handler DCD BusFault_Handler ; Bus Fault Handler DCD UsageFault_Handler ; Usage Fault Handler DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD vPortSVCHandler ; SVCall Handler DCD DebugMon_Handler ; Debug Monitor Handler DCD 0 ; Reserved DCD xPortPendSVHandler ; PendSV Handler DCD xPortSysTickHandler ; SysTick Handler
I'm using the CMSIS and stdPerph driver interface from ST, to set up the clock and the SystemTick. I hope anyone can help me to solve this problem !
RE: Problem with vPortStartFirstTask on CM3 and KPosted by Kasper on December 23, 2010 Here is my program [code SystemInit (); // CMSIS system init SysTick_CLKSourceConfig( SysTick_CLKSource_HCLK ); xTaskCreate( vTaskCode, ( signed portCHAR * ) "LCD", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL ); ]vTaskStartScheduler(); These are my global defines USE_FULL_ASSERT USE_STDPERIPH_DRIVER STM32F10X_LD_VL VECT_TAB_SRAM RVDS_ARMCM3_LM3S1
RE: Problem with vPortStartFirstTask on CM3 and KPosted by Richard on December 23, 2010 I presume you mean "svc 0", not "SCV 0".
Try putting a "cpsie i" instruction before the "svc 0" instruction - it might be that the start up code is leaving interrupts globally disabled in the CPSR. The FreeRTOS code does not expect to touch the global interrupt status, only the BASEPRI register.
If you get a warning saying that some padding was added, just either ignore it, use the asm directive to ensure correct padding, or most simply add a "nop" instruction after the svc 0, so you get
cpsie i svc 0 nop
where previously there was just svc 0
Regards.
RE: Problem with vPortStartFirstTask on CM3 and KPosted by Kasper on January 3, 2011 Hi Thanks for the repply, hower it did not solve the problem. But I have it up running now. I missed a couple of lines to set the interrupts prioty
/* Set the Vector Table base address at 0x08000000 */ NVIC_SetVectorTable( NVIC_VectTab_FLASH, 0x0 );
NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
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