Hey guys
Thanks for all your time. My name is Jaosn. Currently im working on a
project using Tmote Sky and MMA8452 which is a accelerometer sensor. I try
to use tinyos I2C API to write/read from the MMA8452, but the readdone is
always fail. i was so confused about it.
could someone help me out please.
I don't know whether do i need to use some other interface besides the
Resource and I2CPacket? How can i initialize the transmission?
appreciate for your help.
sincerely
Jason
below is my code:
2 #include "printf.h"
3 #include <Timer.h>
4 #include <I2C.h>
5
6
7 module ReceiverC {
8 uses {
9 interface Boot;
10 interface Leds;
11 interface Resource;
12 interface Timer<TMilli> as Timer0;
13 interface I2CPacket<TI2CBasicAddr> I2CPacket;
14 }
15 }
16
17 implementation {
18
19 uint8_t reg_addr;
20 uint8_t reg_value;
21
22 event void Boot.booted(){
23 call Timer0.startPeriodic(3000);
24 }
25
26 event void Timer0.fired()
27 {
28 printf("Timer0 short\n");
29 printfflush();
30 call Resource.request();
31 }
32 event void Resource.granted() {
33 reg_addr = 0x0D;
34 call I2CPacket.write(I2C_START, 0x3A, 1, ®_addr);
35 }
36
37 async event void I2CPacket.writeDone(error_t error, uint16_t addr,
uint8_t length, uint8_t* data) {
38 if (error == SUCCESS){
39 call Leds.led0Toggle();
40 printf("w d success\n %u", *data);
41 } else if ( error == FAIL){
42 printf("w d fail\n");
43 }
44 printfflush();
45 call I2CPacket.read(I2C_STOP, 0x3B, 1, ®_value);
46 }
47 async event void I2CPacket.readDone(error_t error, uint16_t addr,
uint8_t length, uint8_t* data) {
48 if (error == SUCCESS){
49 call Leds.led1Toggle();
50 printf("r d success\n");
51 } else if ( error == FAIL){
52 printf("r d fail\n%u", *data);
53 }
54 printfflush();
55 call Resource.release();
56 }
57 }
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