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TI MSP432P401R LaunchPad + simplelink I2C例程跑不通

在TI的MSP432P401R LaunchPad板子上,实验I2C主从收发,用两个板子分别作为主设备和从设备,实验i2cmasterexample1和i2cslaveexample1,运行结果不对,用I2C_MODE_BLOCKING模式,主机I2C_transfer总是阻塞,不知道什么原因?

用的是TI的板子和例程,怎么跑不通呢?总是阻塞在I2C_transfer

例程位于:

C:\ti\simplelink_msp432_sdk_1_30_00_40\examples\rtos\MSP_EXP432P401R\drivers\i2cmasterexample1

C:\ti\simplelink_msp432_sdk_1_30_00_40\examples\rtos\MSP_EXP432P401R\drivers\i2cslaveexample1