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MSP430FR5994: 导入案例串口无法通信

Part Number: MSP430FR5994

https://dev.ti.com/tirex/explore/node?node=A__AO7Wo-wak-w1wH4YM2N5aw__msp430ware__IOGqZri__LATEST将此案例在CCS中运行,板卡是MSP430FR5994,将P6.0和P6.1以及GND连接RS232串口,在连接PC,串口助手发送字=字符板卡没有任何回显,没有进入程序接收中断,怀疑是连接问题,检查串口一切正常,收发引脚也与板卡交叉,这种可能是什么问题?