Nano-RK

= Error Handling =

Nano-RK uses the convention that system calls return -1 upon error and 1 upon success.

NRK_OK 1

NRK_ERROR -1

'''_nrk_errno_set(NRK_ERRNO error_code)'''

This function should be used by user defined system calls to set an error number.

'''uint8_t nrk_errno_get()'''

Once a function returns failure (-1), this function can be used to get a more descriptive error code.

'''Kernel Errors'''

*NRK ERROR: ERROR_MESSAGE

''task_id'' is the ID of the task that caused the error. 0 means the kernel had an internal error.

• "Task Stack Overflow" * The canary value in the identified task was over written. Try making the task stack size larger.
• "Reserve Error in Scheduler"
• "Task Reserve Violated" * Increase the reservation for the task, or disable a task reserve by setting it to 0
• "Scheduler Missed Wakeup"
• "Duplicated Task ID" * There is a problem with the way the tasks are being configured
• "Unexpected Restart"
• "Idle or Kernel Stack Overflow"
• "Extra Task started, is nrk_cfg.h ok?" * Most likely NRK_MAX_TASKS in nrk_cfg.h needs to be larger
• "Low Voltage"
• "Unhandled Interrupt Vector"
• "Timer Overflow"
• "Device Driver Error"
• "Failed to create Signal"
• "Kernel function not implemented"
• "UNKOWN"