rtt stdio初次使用，新建项目后报错如下，怎么解决

Question

../drivers/drv_usart.c:338:16: error: 'struct serial_configure' has no member named 'flowcontrol'
     switch (cfg->flowcontrol)
                ^
../drivers/drv_usart.c:340:10: error: 'RT_SERIAL_FLOWCONTROL_NONE' undeclared (first use in this function)
     case RT_SERIAL_FLOWCONTROL_NONE:
          ^
../drivers/drv_usart.c:340:10: note: each undeclared identifier is reported only once for each function it appears in
../drivers/drv_usart.c:343:10: error: 'RT_SERIAL_FLOWCONTROL_CTSRTS' undeclared (first use in this function)
     case RT_SERIAL_FLOWCONTROL_CTSRTS:
          ^
arm-none-eabi-gcc "../applications/main.c"
make: *** [drivers/subdir.mk:99: drivers/drv_usart.o] Error 1
make: *** Waiting for unfinished jobs....
"make -j8 all" terminated with exit code 2. Build might be incomplete.

14:49:17 Build Failed. 5 errors, 0 warnings. (took 9s.565ms)

Answer 1

同问，一模一样