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Hi Ti,
beaglebone black, starterware 2.0.1.1
我在ccs里import了starterware evmAM335x example project "mcspiFlash_edma.c".
程序测试 spi0 edma 时的工作情况.
程序执行时, 用示波器观察spi0_DOUT (不接负载或 spi slave device), 一直处于高电平(如图1 所示),输出加一个100k电阻接地, 依然如此. (绿色是 Dout, 黄色是 sclk)
但是如果把DOUT 和 DIN 串接起来, 则波形显示数据(如图2 所示)
这个例程是针对EVM板的。BBB板子的话,可以参考processor SDK里的例程。
http://software-dl.ti.com/processor-sw/esd/PROCESSOR-SDK-RTOS-AM335X/latest/index_FDS.html