[Paparazzi-devel] some problems about "openlog.c"

[Mike]

Hi all,
       recently, I learned something about how to save some specific data to
openlog; So I see this code of it, here is the code of openlog.c:
       /**
 * This module provides a timestamp-message, allowing
 * sw/logalizer/openlog2tlm to convert a recorded dumpfile,
 * created by openlog into the pprz-tlm format, to be converted into
 * .data and .log files by sw/logalizer/sd2log
 */

#include "openlog.h"
#include "messages.h"
#include "subsystems/datalink/downlink.h"
#include "mcu_periph/uart.h"


uint32_t timestamp = 0; ///< Timestamp to be incremented during operation

void init_openlog(void) {
}

void periodic_2Hz_openlog(void)         {
  timestamp=timestamp+500;
  DOWNLINK_SEND_TIMESTAMP(DefaultChannel, DefaultDevice, &timestamp);
}

      what the problem is that: First I can not find the
function"DOWNLINK_SEND_TIMESTAMP()",
Second I can not find the "messages.h", where are the location? 

Mike 
Thanks



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