The idea is to use "*async event void UartStream.receivedByte(uint8_t data)*" to process the stream *"byte-by-byte"*, instead of calling the "*UartSream.receive(buf, len)"* function. The later would return only when exactly "len" bytes are received, and it would hold the resource.
Processing the uart stream byte by byte is actually how the serial library handles the received packets, since the packet length usually varies. Please read the code in */tos/lib/serial* carefully, especially the implementations in SerialDispatcherP, HdlcTranslateC, and SerialP. You should also configure the serial port to the same baud rate as the sensor. An example uartstream with configuration is provided here: http://tinyos-help.10906.n7.nabble.com/any-working-example-of-UartStream-receive-td4750.html . Also, the following link using the Decagon MPS-2 sensor with telosb, as your reference, especially part 2: https://zhongcs.wordpress.com/2015/02/15/decagon-mps-2-water-potential-sensor-with-telosb-mote/ . On Mon, Jan 1, 2018 at 9:23 AM, Jobish John <jobishjohn.m...@gmail.com> wrote: > Hi, > > I am using telosb mote and UartStream interface in nesc to receive data > from a sensor (Tinyos 2.1.2). Once UartStream.receive() is initiated and > due to some reasons if the data is not received, the mote will keep on > waiting for the data and is not able to receive or transmit any packets > after that. > > I have tried to implement a timeout, based on a timer and resource > interface as shown below. But it could not solve the issue. > > uses interface Resource as Resource_uart_TIVAC; > uses interface UartStream as uart_TIVAC; > ----------- > ----------- > event void Resource_uart_TIVAC.granted() > { > if ((call uart_TIVAC.receive(refbuf, 4))== SUCCESS) > call uarttimeout_timer.startOneShot(1024); > } > ------------ > event void uarttimeout_timer.fired() > { > if(call Resource_uart_TIVAC.release()!= SUCCESS) > { > printf("uart not released\n"); > printfflush(); > } > } > -------------- > components new Msp430Uart0C() as uart_sensor; > > The uart is not getting released and telosb radio is not able to transmit > or receive any packets after that. Please suggest a way to handle this. > > Thanks for your valuable time. > > Regards > Wishing you a happy new year 2018.. > Jobish John > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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