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6455mcbsp 配置成UART不用DMA,采用CPU查询方式可行吗?

你好,你使用C6455的MCBSP成功配置成UART吗?我采用CPU查询方式发送数据,起始位+8个数据+停止位,但示波器抓出的波形只有一个有效数据,其他都是重复那个数据,请问哪项配置会影响,这个问题困扰很久了,就是调试不通。