Hi, On Mon, Feb 27, 2012 at 6:54 PM, Sergio Gonzalez <[email protected]> wrote: > Hi Bharti, > > Also, I'd make sure to call I2CPacket.isOwner() inside > I2CPacket.readDone() just to make sure, and populate your local.reading > array if the return value of isOwner yields TRUE.
That's unnecessary, the resource interface is quite reliable. However, most sensor needs some time between the measure command and the downloading, that could be a problem. Andris > > Sergio > > > On 02/27/2012 09:34 AM, András Bíró wrote: >> Hi, >> >> I think that code shouldn't work with one sensor eighter. The >> I2CPacket interface only needs the 7 bit address, whithout the >> read/~write bit. So your address for the 0x40/0x41 chip is 0x20. >> >> Andris >> >> On Mon, Feb 27, 2012 at 6:10 PM, #BHARTI GOEL#<[email protected]> wrote: >>> Hi, >>> >>> I am trying to interface PCF8591 chips over I2C bus with an iris mote to get >>> pressure sensor reading. When I use one chip, my program is working. However >>> when I add one more chip , it stops after taking one reading. I am not sure >>> what the problem is. I am reading the 2 chips in sequence one after the >>> other. I am using Atm128I2CMasterC as the master device for both the chips. >>> Here is my code. Thanks a lot >>> >>> #include<I2C.h> >>> #include "Timer.h" >>> #include "bed.h" >>> >>> module BedC @safe() { >>> uses { >>> interface Boot; >>> interface Leds; >>> interface Timer<TMilli>; >>> //I2C >>> interface Resource as I2CResource; >>> interface I2CPacket<TI2CBasicAddr> as I2CPacket1; >>> interface I2CPacket<TI2CBasicAddr> as I2CPacket2; >>> // RADIO COMMUNICATION >>> interface AMSend; >>> interface SplitControl as RadioControl; >>> >>> } >>> } >>> >>> implementation { >>> >>> message_t sendBuf; >>> bool sendBusy = FALSE; >>> bed_t local; >>> uint8_t getDataCommand; >>> uint8_t* readData; >>> bool isReadyToSend = FALSE; >>> uint8_t prevData[NREADINGS]; >>> //bool isDetection = FALSE; >>> >>> >>> event void Boot.booted() { >>> local.id = TOS_NODE_ID; >>> call RadioControl.start(); >>> } >>> >>> event void RadioControl.startDone(error_t error) { >>> >>> call Timer.startPeriodic(3000); >>> } >>> >>> event void RadioControl.stopDone(error_t error) { >>> } >>> >>> task void sendData() { >>> if (!sendBusy&& sizeof local<= call AMSend.maxPayloadLength()) { >>> memcpy(call AMSend.getPayload(&sendBuf, sizeof(local)),&local, >>> sizeof local); >>> if (call AMSend.send(AM_BROADCAST_ADDR,&sendBuf, sizeof local) >>> == SUCCESS) { >>> sendBusy = TRUE; >>> local.count++; >>> } >>> } >>> } >>> >>> event void Timer.fired() { >>> if(isReadyToSend) { >>> call Leds.led0Toggle(); //red >>> post sendData(); >>> isReadyToSend = FALSE; >>> } else { >>> call Leds.led2Toggle(); //yellow >>> call I2CResource.request(); >>> } >>> } >>> >>> event void I2CResource.granted() { >>> getDataCommand = 0x43; >>> if(call I2CPacket1.write(I2C_START | I2C_STOP, 0x48, 1, >>> (uint8_t*)(&getDataCommand)) == SUCCESS) { >>> >>> } >>> } >>> >>> async event void I2CPacket1.writeDone(error_t success, uint16_t addr, >>> uint8_t length, uint8_t* data) { >>> if(call I2CPacket1.read(I2C_START | I2C_STOP, 0x49, 4, >>> (uint8_t*)(&readData)) == SUCCESS) { >>> >>> } >>> } >>> >>> async event void I2CPacket1.readDone(error_t success, uint16_t addr, >>> uint8_t length, uint8_t* data) { >>> >>> if(success == SUCCESS) { >>> local.reading[0] = readData[0]; >>> local.reading[1] = readData[1]; >>> local.reading[2] = readData[2]; >>> local.reading[3] = readData[3]; >>> //call Leds.led1Toggle(); //green >>> >>> >>> } >>> if(call I2CPacket2.write(I2C_START | I2C_STOP, 0x40, 1, >>> (uint8_t*)(&getDataCommand)) == SUCCESS) { >>> >>> } >>> } >>> >>> async event void I2CPacket2.writeDone(error_t success, uint16_t addr, >>> uint8_t length, uint8_t* data) { >>> if(call I2CPacket2.read(I2C_START | I2C_STOP, 0x41, 4, >>> (uint8_t*)(&readData)) == SUCCESS) { >>> >>> } >>> } >>> >>> >>> async event void I2CPacket2.readDone(error_t success, uint16_t >>> addr, >>> uint8_t length, uint8_t* data) { >>> >>> if(success == SUCCESS) { >>> local.reading[4] = readData[0]; >>> local.reading[5] = readData[1]; >>> local.reading[6] = readData[2]; >>> local.reading[7] = readData[3]; >>> isReadyToSend = TRUE; >>> call I2CResource.release(); >>> >>> } >>> >>> >>> } >>> >>> >>> event void AMSend.sendDone(message_t* msg, error_t error) { >>> call Leds.led1Toggle(); //green >>> sendBusy = FALSE; >>> } >>> >>> } >>> >>> --------------------------------------------------------------//// >>> >>> configuration BedAppC { } >>> >>> implementation >>> { >>> components BedC, MainC, LedsC, ActiveMessageC, >>> new TimerMilliC(), new Atm128I2CMasterC() as Atm128I2CMasterC, new >>> AMSenderC(AM_BED); >>> >>> BedC.Boot -> MainC; >>> BedC.Leds -> LedsC; >>> BedC.I2CResource -> Atm128I2CMasterC; >>> BedC.I2CPacket1 -> Atm128I2CMasterC; >>> BedC.I2CPacket2 -> Atm128I2CMasterC; >>> BedC.Timer -> TimerMilliC; >>> BedC.AMSend -> AMSenderC; >>> BedC.RadioControl -> ActiveMessageC; >>> } >>> >>> >>> regards >>> Bharti >>> >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
