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Timer配置

.\driverlib\timer.h(247): error:  #20: identifier "bool" is undefined
.\driverlib\timer.h(249): error:  #20: identifier "bool" is undefined
.\driverlib\timer.h(253): error:  #20: identifier "bool" is undefined
.\driverlib\timer.h(255): error:  #20: identifier "bool" is undefined
.\driverlib\timer.h(281): error:  #20: identifier "bool" is undefined
调用timer.h头文件时为什么会出现这个错误,编译环境是MDK4.72,开发板是TM4C1294XL