How to use Objects FIFO?

[asdasdasd]

Hi,
I want to use FIFO object to transfer array data from one thread to another but the data received wrong .

At first I have initialize the FIFO:

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#define FIFO_obj_available 2
union U_g_b{
    GPS_b_msg GPS_b;
    uint8_t data[sizeof(GPS_b_msg)];
}u_msg_send,u_msg_rec;
#define FIFO_OBJ_SIZE sizeof(u_msg_send)
static objects_fifo_t fifo_buffer;
static uint8_t data_buffer[FIFO_obj_available][FIFO_OBJ_SIZE];
static msg_t msg_buffer[FIFO_OBJ_SIZE];


initialize fifo

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 chFifoObjectInit(&fifo_buffer, FIFO_OBJ_SIZE, FIFO_obj_available, data_buffer, msg_buffer);
 

IN send thread:

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u_msg_send.GPS_b.instance++;
chFifoSendObject(&fifo_buffer,u_msg_send.data);


IN rec thread:

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 chFifoReceiveObjectTimeout(&fifo_buffer,(void *)u_msg_rec.data,TIME_INFINITE);
    chprintf(debug_ch, "inst: %u . \n\r",u_msg_rec.GPS_b.instance);


why the data has received wrong?!.
is there any example ?
thanks for any help

asd.

[Giovanni]

Not sure but objects need to be aligned as structures, you are defining those are uint8_t arrays which could not be aligned correctly. Try defining your messages as structures instead.

There are examples in the OSLIB test suite look into /test/oslib/source/test

Giovanni