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AM5728 DSP端 UART 接收问题

Other Parts Discussed in Thread: AM5728

使用的是ti-processor-sdk-rtos-am57xx-evm-04.03.00.05版本里面的PDK库进行AM5728 DSP端串口驱动。串口参数如图配置,首先UART_init();然后open了两个串口uart_handle1 = UART_open(0, &user_params);uart_handle3 = UART_open(2, &user_params);最后使用串口UART_read(uart_handle1, buf_r,20);

UART_write(uart_handle1,buf_r,20);实现了dsp接收数据回传到电脑上位机串口软件,问题是除了0XFF外,其它的接收都可以返回,当软件给串口发送0XFF后没有任何返回,查看代码也没看到有对0XFF检测的请问大概是什么问题呢??