[Tinyos-devel] Current status of the message buffer discussion

[Omprakash Gnawali]

We discussed these interfaces during net2 meeting last week. Option 3
might be problematic because something like blip might need support
for multiple addressing modes.

- om_p

On Fri, May 22, 2009 at 2:43 PM, Miklos Maroti <mmaroti at math.u-szeged.hu> wrote:
> Dear Eric,
>
> You brought up very good points, and I am very happy that others are
> also engaged in the discussion. At this point I am convinced that both
> Jan's and my proposals could be made to work. But to really compare
> the two approaches we need use cases, very well defined used cases.
>
> Just to start the discussion, let me start with IEEE 802.15.4 link
> layer. Here are some options:
>
> ------- Option #1 -------
>
> interface Ieee154Send
> {
>        command error_t send64(uint64_t dest, bool ackReq, message_t* msg);
>        command error_t send16(uint16_t dest, bool ackReq, message_t* msg);
>        event void sendDone(message_t* msg, error_t error, bool acked);
>        command void* getPayload(message_t* msg, uint8_t len);
> }
>
> interface Ieee154Packet
> {
>        command uint16_t getSource16(message_t* msg);
>        command uint64_t getSource64(message_t* msg);
>        command uint16_t getDestination16(message_t* msg);
>        command uint64_t getDestination64(message_t* msg);
>        // no set commands as this interface should be used only for
> received messages
>
>        command void* getPayload(message_t* msg);
>        command uint8_t getLength(message_t* msg);
> }
>
> ------- Option #2 -------
>
> enum ieee154_flags
> {
>        IEEE154_ACK_REQ = 1 << 0,
>        IEEE154_FRAME_PENDING = 1 << 1,
>        IEEE154_COMPRESS_TO_16BIT = 1 << 2,
> };
>
> interface Ieee154Send
> {
>        command error_t send(uint64_t dest, uint8_t flags, message_t* msg,
> void* payload, uint8_t length);
>        event void sendDone(message_t* msg, error_t error, uint8_t flags);
>        command void* getPayload(message_t* msg, uint8_t len);
>        command uint8_t getMaxPayload();
> }
>
> interface Ieee154Receive
> {
>        event message_t* receive(uint64_t source, message_t* msg, void*
> payload, uint8_t length);
> }
>
> ------- Option #3 -------
>
> #ifdef USE_64BIT_ADDR
> typedef uint64_t address_t;
> #else
> typedef uint16_t address_t;
> #endif
>
> interface Ieee154Packet
> {
>        command void format(message_t* msg, uint8_t flags);
>
>        command address_t getSource(message_t* msg);
>        command address_t getDestination(message_t* msg);
>        command void setSource(message_t* msg, address_t addr);
>        command void setDestination(message_t* msg, address_t addr);
>
>        command void requestAck(message_t* msg, bool ack);
>        command bool wasAcknowledged(message_t* msg);
>
>        command void* payload(message_t* msg);
>        command uint8_t payloadLength(message_t* msg);
>        command void setPayloadLength(message_t* msg, uint8_t len);
>        command uint8_t maxPayloadLength(message_t* msg);
> }
>
> interface Send
> {
>        command error_t send(message_t* msg);
>        event void sendDone(message_t* msg, error_t error);
> }
>
> interface Receive
> {
>        event message_t* receive(message_t* msg);
> }
>
> Miklos
>
> _______________________________________________
> Tinyos-devel mailing list
> Tinyos-devel at millennium.berkeley.edu
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-devel
>