Data passed to app_scheduler seems to corrupt at random

[Ivan Herrera]

I'm using app_scheduler to pass UART events in the "main thread". I'm storing multiple data types in a struct (arrays, integers) and I've set the max event size to the size of this struct. What I'm seeing is that between app_sched_event_put and the actual event executing in the main thread, the data passed to app_sched_event_put is often overwritten. Sometimes partially, sometimes fully, even the integers inside the struct. I've tried debugging but I haven't been to find out what's writing to the buffer. 

I'm using the APP_SCHED_INIT MACRO to initialize app_scheduler so the buffer should be defined by the library and thus I shouldn't have to worry about the buffer myself, correct?

 

[Sigurd]

Hi,

What SDK versions are you using ?

Do you have any code snippets that shows how you use app_sched_event_put ?

How does your struct look like?

[Ivan Herrera]

Hi Sigurd,

Thanks for your reply! I'm using SDK 15.3. Below a code snippet where app_sched_event_put is used

static void gps_event_handler(gps_evt_t const *p_gps_evt)
{
  ret_code_t err_code;
  last_gps_status = p_gps_evt->evt_type;
  switch (p_gps_evt->evt_type)
  {
  case APP_GPS_FIX_MESSAGE:
  {
    NRF_LOG_INFO("The GPS has received signal.");
    last_gps_update = p_gps_evt->timestamp;
    second_timer = p_gps_evt->timestamp;
    app_sched_event_put(&p_gps_evt, sizeof(gps_evt_t), gps_scheduler_event_handler);
  }
 }
}

Below the struct:

typedef enum
{
    PROXLOG_GPS_DETECTED = 0,
    PROXLOG_GPS_FIX_MESSAGE = 1,
    PROXLOG_GPS_NO_FIX_MESSAGE = 2,
    PROXLOG_GPS_ERROR = 3,
    PROXLOG_GPS_TIMEOUT = 4,
} gps_evt_type_t;

typedef struct
{
    gps_evt_type_t evt_type; /**< Type of event. */
    uint32_t timestamp;
    char latlong[30];
    uint8_t latlong_length;
    uint32_t error_code;
} gps_evt_t;

typedef void (*proxlog_gps_evt_handler_t)(gps_evt_t *p_evt);

Below is my handler, by debugging I can already tell that when the program enters this section, the data in the struct is already garbled:

void gps_scheduler_event_handler(void *p_event_data, uint16_t event_size)
{
  gps_write_to_sd_handler(*((gps_evt_t *)p_event_data));
}

[Sigurd]

Try

app_sched_event_put(p_gps_evt, sizeof(gps_evt_t), gps_scheduler_event_handler);