#include <sos.h>#include <sos_info.h>#include <random.h>typedef struct {    uint16_t shiftReg;    uint16_t initSeed;    uint16_t mask;} RandomState;static RandomState randomst;void random_init(){    HAS_CRITICAL_SECTION;    ENTER_CRITICAL_SECTION();    randomst.shiftReg = (uint16_t)(119 * 119 * (node_address + 1));    randomst.initSeed = randomst.shiftReg;    randomst.mask = (uint16_t)(137 * 29 * (node_address + 1));    LEAVE_CRITICAL_SECTION();}uint16_t ker_rand() {    HAS_CRITICAL_SECTION;    bool endbit;    uint16_t tmpShiftReg;    ENTER_CRITICAL_SECTION();    tmpShiftReg = randomst.shiftReg;    LEAVE_CRITICAL_SECTION();    endbit = ((tmpShiftReg & 0x8000) != 0)?true:false;    tmpShiftReg <<= 1;    if (endbit)        tmpShiftReg ^= 0x100b;    tmpShiftReg++;    ENTER_CRITICAL_SECTION();    randomst.shiftReg = tmpShiftReg;    LEAVE_CRITICAL_SECTION();    tmpShiftReg = tmpShiftReg ^ randomst.mask;    return tmpShiftReg;}