Transfer data of mass storage device to ip network

1. We have used the usb mass storage example given in the Reference Design of the Zedboard, and Zedboard has been succesfully emulated as a usb mass storage device .

2. Used the Lwip application example from the same source and by using socket programming sent the udp data to the network.

3. Now our main motive is to combine both the above examples and transfer the data received in the mass storage device to the network.

4. Both examples use freeRtos. And for the simultaneous use of both the examples we have used separate task for both examples.

5. When we run both the task. One task blocks the Other one. As usb is an interrupt based task.

0 Former Member over 10 years ago

Pamela,
Pre-emptable real time OSes are set up to allow tasks assigned a higher priority to be able to suspend lower priority tasks and take control of the processor (when running on a single CPU). If a higher priority task gets blocked by a lower priority task, it is generally because the lower priority task has control of a resource required by the other, resulting in situation called priority inversion. From the description you provide I'm not sure if this is the case or not, but you need to identify exactly what mechanism is causing one task to block another (other than the normal priority values) and then take steps to eliminate the problem.
In rare cases it may be necessary to split the tasks across two CPUs in an AMP configuration, but in general there is usually some way to restructure the code to eliminate the block.
Ron
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0 Former Member over 9 years ago

It is given in the below link that it is impossible to run a Non-interrupt task when an interrupt is executing.

http://www.freertos.org/FreeRTOS_Support_Forum_Archive/September_2015/freertos_FreeRTOS_tasks_can_interrupt_USB_stack_implementation_23d7b809j.html

So we thought as per the suggestion to run both the task under different processors.

Also example of XAPP1078 given under reference design of Zedboard has been used in which two processors are used to run linux and baremetal system.

But in my application i have to run baremetal on one processor and freertos on another, so is there any way to share data between the two.
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