Hellow all.
I used the example from /SenseLightToLog/SimpleCmdMsg.nc line 116 and tried
to read log from EEPROM. But I am not sure if I use the correct syntax and I
got no result back.
Here is part of line 116 of SimpleCmdMsg.nc
call LoggerRead.readNext(((struct LogMsg *)log_msg.data)->log)
log_msg is defined as:
TOS_Msg log_msg
Besides, in file SimpleCmd.h the structure of LogMsg is defined as:
typedef struct LogMsg {
uint16_t sourceaddr;
uint8_t log[16];
} LogMsg;
In my application case, I make my own structure as follows:
typedef struct BodyMsg
{
uint16_t source;
uint16_t time;
uint16_t reading;
} BodyMsg;
typedef struct CmdMsg
{
int8_t action;
union {
BodyMsg body_msgs;
uint8_t log[6];
} Data;
} CmdMsg;
I want to point the read log data to the portion of log[6].
So I use the syntax like this:
TOS_Msg SendPkt;
call LoggerRead.read( cur_line, ((struct CmdMsg *)SendPkt.data)->Data.log );
After that I send out the data read from log like this:
struct CmdMsg *Cmd_ptr;
Cmd_ptr = (struct CmdMsg *) SendPkt_ptr->data;
Cmd_ptr -> action = LOAD;
call SendLog.send( BASE_STATION, sizeof(struct CmdMsg), SendPkt_ptr );
But I did not get the logging data sent out. And I did not know if I have
read the data from EEPROM or not. I think I have stored the data to the EEPROM
correctly.
Can anyone point my out the mistake? Right now I am guessing
Gary
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