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CCS: Interrupt mode and rotation mode of SCI2 serial port



Tool/software: Code Composer Studio

hello,

when I use the SCI2 for uart to send and receive data, when I use the polling mode,send data is correct.

but when  I use the Interrupt mode, the data is wrong. the code  as following:

The data received by the serial port is as follows,should be 01 02 03 04 05 06 07 08 09 0A 15

What does the interrupt mode mean? For my understanding is to enter the interrupt serial port to send data. After the transmission is completed, exit the interrupt and execute the following code, but the actual test result does not seem to be like this. How should I understand it?