STVD使用printf输出数据错误

#include "stdio.h"　　//必不可缺少
char putchar (char c)
{
    /* Write a character to the USART */
    USART_SendData8(USART1, c);
    /* Loop until the end of transmission */
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

    return (c);
}

typedef struct
{
    uint16_t time;
    uint8_t cRssi;
}SysParam;

SysParam Sys;//定义了一个结构体数据

printf("hello world!");

printf("rssi %d\r\n",Sys.cRssi);

printf("rssi %d\r\n",Sys.time);

printf("rssi %d\r\n",（uint16_t）Sys.cRssi);