uart.err

来自「Colorlcdtest 是 320*240 的 256色液晶测试源程序。」· ERR 代码 · 共 8 行

"uart.c", line 97: Warning: signed constant overflow: '<<'
"uart.c", line 223: Warning: signed constant overflow: '<<'
"uart.c", line 309: Warning: signed constant overflow: '<<'
"uart.c", line 440: Warning: signed constant overflow: '<<'
"uart.c", line 690: Warning: signed constant overflow: '<<'
"uart.c", line 691: Warning: signed constant overflow: '<<'
uart.c: 6 warnings, 0 errors, 0 serious errors