Partie interactive du site pédagogique ELECINF344/ELECINF381 de Télécom ParisTech (occurrence 2011).


MB Led: Easter Saturday in A405

Today, we continued on our recent work : I worked on the algorithm and on the rotation of a block. The rotation works quite well now. The algorithm for this rotation is simple : When a communication between two blocks is stopped (due to the left of someone), the two blocks save their « interfaces » (aliases of the UARTs ). When there is a PING from a block, we check the saved interfaces in order to see if the block was a « friend » of this block. If it’s the case, we just calculate the rotation of the block.

The main problem is that a block can communicate with 4 others blocks at the same time. So, sometimes, we have to wait a little bit when we want to compare the interfaces.

Cédric noticed in the afternoon a bug in the IrDA functions and we fixed this. Now, the IrDA has more reliable and there are few problems in the network.

I still have problems when two networks meet with more than one block each involved in the « deal » but things are going better each day.

Benjamin worked on the launcher task. He thought of a remote block who can control the animation/game that will be played soon after.

Cédric continued the firmware transmission and the protocol is actually functional at good speed. But he is now facing problems with flash writing.


Here is a little video of the synchronization (running on the GLiPs but the MBLed are arriving soon):


Every block knows its i,j and minI, minJ, maxI, maxJ in the network. The block in the north-west shows a M; north-east a B; south-west LE: south-east D. If he is alone, he shows a M too.
That’s why sometimes in the video, there are 2 M : one of the block has encountered problems and reset himself.

For the synchronization, the leader gives the time every 20 PING (approximately every second), when a block receive that, it transmits it to his neighbor and so on.



Sur le même sujet :

  1. MB Led: Synchronization, algorithm reliability and improving IrDA transmission
  2. MB Led: Working IrDA and colored LEDs.
  3. MB Led : Algorithm
  4. MB Led : First test with MB Led blocks
  5. MB Led: Led Matrix, Direction and Acknowledgment

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