Hello,
I run the following code in an infinity loop. So I install the driver for memory only the first time. Then I open the file, read the io_controll and close the file.
This works well until the first loops (maybe this are 900 or 1000 calls of the loop).
But then I will get a NULL-pointer from function _io_fopen(). Does anyone know what is going wrong here?
By the way: When I have a look to the source code of MQX-function _io_mem_close, I can see this function will do nothing than return MQX_OK. But I think this should not be the problem.
#define SIZE_OF_MEM 2000#define NAME_OF_DRIVE "my:"uint32_t my_mem_init(void){ MQX_FILE_PTR drive_p = NULL; static uint32_t mem_init_done = 0; uint32_t size = 0; uint32_t start_addr = 0; if ( mem_init_done == 0 ) { if (_io_mem_install(NAME_OF_DRIVE, NULL, SIZE_OF_MEM) == MQX_OUT_OF_MEMORY) { printf("could not install drive\n"); return 1; } mem_init_done = 1; } //! Open the drive drive_p = _io_fopen( NAME_OF_DRIVE, "r"); if ( drive_p == NULL ) { printf("unable to open %s\n", NAME_OF_DRIVE); return 1; } //!___check_________________________________________________________________ _io_ioctl(drive_p, IO_MEM_IOCTL_GET_TOTAL_SIZE, &size); _io_ioctl(drive_p, IO_MEM_IOCTL_GET_BASE_ADDRESS, &start_addr); printf("drive installed: %u bytes @ addr. %x\n", size, start_addr); //!___close_________________________________________________________________ _io_mem_close(drive_p); return 0;} Thanks for help.
