How to data save to NV storage for CC2530?

Try the following example codes:

uint8 nv_test=0;
uint16 nv_test_id=0x0401;
osal_nv_item_init(nv_test_id, 1, NULL);

osal_nv_write(nv_test_id, 0, 1, &nv_test);
osal_nv_read(nv_test_id, 0, 1, &nv_test);