Mar 11, 2009  FreeRTOS support forum archive - FATFS and FreeRTOS again. In return for using our software for free, we request you play fair and do your bit to help others! Sign up to receive notifications of new support topics then help where you can. Aceesing the FATFS calls for writing to a SDcard from multiple tasks with mutex, decreses the card. Sep 9, 2018 - FATFS module provides an interface to configure a driver for FAT file. And pin-mux for UART pins are required before calling any driver APIs.

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Hi all, I have included both FatFS with MMC card support (Thanks Joel!) and FreeRTOS in my application and now I keep getting data abort interrupts. I have only one interrupt source (uart) and that runs completely independent of the rtos (no system calls).

The compiler is the IAR embedded workbench. The optimization is set to off. It appears that without either of the systems the other runs fine. I can do disk init and mount without problems, but when I try to open a file using FatFS f_open the exceptions occurs.

The LR register reports the exception to have occurred at different places inside the kernel - at the end of the vTaskSwitchContext function (sometimes), in the portRESTORE_CONTEXT function (most of the time) or in vListInsertEnd function (sometimes). I have tried to increase both the stack size in the linker file and increasing the heap for freertos without any changes. Any suggestions?

Thanks Thomas Augustinus. > I have tried to increase both the stack size in the linker file and > increasing the heap for freertos without any changes. Quite likely a stack overflow in a task. Increasing the heap size not effect this - try increasing the size of the stack allocated to the task when the task is created.

The task stacks are filled with 0xa5 - try watching the memory around that pointed to by the stack pointer as you call the problematic function to see if it wipes off the last few 0xa5's. If so then you definitely require more stack.

Regards, Richard. In l., nospam@. Wrote: > > > I have tried to increase both the stack size in the linker file and > > increasing the heap for freertos without any changes. > > Quite likely a stack overflow in a task. Increasing the heap size not > effect this - try increasing the size of the stack allocated to the task > when the task is created. > > The task stacks are filled with 0xa5 - try watching the memory around that > pointed to by the stack pointer as you call the problematic function to see > if it wipes off the last few 0xa5's.

If so then you definitely require more > stack. > > Regards, > Richard.

> I know from experience that FreeRTOS stack overflows are sometimes tough to spot without using a debugger or the vTaskList function. How hard would it be to cause some sort of software interrupt, where you can increase the task stack space automatically (or spit out an error). Or what about having a memory manager that could dynamically adjust the stack during runtime. Or have a super stack space that all tasks use and the rtos manages it. I know I waste like 10-50 bytes per task just for safty sake. OR what about an overflow area.

If a stack is going to overflow into another task, instead it goes into the overflow area, which the rtos can manage and save an overflowed task? >Is there an easy way to get hold of the current tasks 'top-of-stack' >pointer and stack-size? I think of implementing a simple warning via >the uart if the a5 a few bytes from the top is overwritten. The current task top of stack is just the current stack pointer. The limit of the stack can be obtained from the TCB for the task - the TCB for the currently running task is pointed to by pxCurrentTCB. A quick calculation can be performed to determine the risk of overflow. The SafeRTOS code base does some cunning things with the stack to trap overflows.

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