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我想通过dcan的dma方式发送1kb数据，但我在ti论坛上看到dma只能用于IF3 register读取message，请问怎么使用dma发送数据？
目前DMA配置为将数据从IFx数据寄存器传输到CPU SRAM或EMIF存储器。
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e2e.ti.com/.../tms570ls0714-using-dma-for-can1-tx
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https://e2e.ti.com/support/microcontrollers/other-microcontrollers-group/other/f/other-microcontrollers-forum/1001542/tms570ls0714-using-dma-for-can1-tx
