How to write file in SD card for nrf5340?

Question

When use the application(nrf 1.9.9/application/nrf5340_audio), I try to write some log into SD card.

After I add the code

int ret = sd_card_write("logfile", "test123456", 6);

LOG_ERR("ret = %d", ret);

in main.c/main() after sd_card_init()

the log show ret = -16;

it seems f_entry in sd_card_write() is not init before used.

then I add fs_file_t_init(&f_entry); in modules/sd_card.c/sd_card_write();

this time ,the log show :

HL [00:01:19.869,659] [1;31m<err> os: ***** USAGE FAULT *****[0m
HL [00:01:19.869,659] [1;31m<err> os: Stack overflow (context area not valid)[0m
HL [00:01:19.869,659] [1;31m<err> os: r0/a1: 0x200145d8 r1/a2: 0x2000efd5 r2/a3: 0x00000012[0m
HL [00:01:19.869,689] [1;31m<err> os: r3/a4: 0x00000002 r12/ip: 0x00000000 r14/lr: 0x0002cc53[0m
HL [00:01:19.869,689] [1;31m<err> os: xpsr: 0x09100200[0m
HL [00:01:19.869,689] [1;31m<err> os: s[ 0]: 0x00000000 s[ 1]: 0x00000000 s[ 2]: 0x00000000 s[ 3]: 0x00000000[0m
HL [00:01:19.869,689] [1;31m<err> os: s[ 4]: 0x00000000 s[ 5]: 0x00000000 s[ 6]: 0x00000000 s[ 7]: 0x00000000[0m
HL [00:01:19.869,689] [1;31m<err> os: s[ 8]: 0x00000000 s[ 9]: 0x00000000 s[10]: 0x00000000 s[11]: 0x00000000[0m
HL [00:01:19.869,720] [1;31m<err> os: s[12]: 0x00000000 s[13]: 0x00000000 s[14]: 0x00000000 s[15]: 0x00000000[0m
HL [00:01:19.869,720] [1;31m<err> os: fpscr: 0x20001c38[0m
HL [00:01:19.869,720] [1;31m<err> os: Faulting instruction address (r15/pc): 0x00033920[0m
HL [00:01:19.869,750] [1;31m<err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0[0m
HL [00:01:19.869,750] [1;31m<err> os: Current thread: 0x200030a8 (main)[0m
HL [00:01:19.869,750] [1;31m<err> error_handler: Caught system error -- reason 2. Entering infinite loop[0m

can anyone help me what should I do about this issue, or how to write file by other way