http://s12/mw690/735f2910gd1186f4c3bfb&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

1 数字回环模式

http://s11/mw690/735f2910gd107d0c6aaea&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

dsp中的MCBSP接口在数字回环模式下，接受信号通过复用器和相应的发送信号在内部连接，DR连接DX，。。。。。。。这种模式在只有一个DSP的情况下可以测试串口代码，MCBSP接收自己发出的数据。

 If the loop-back is enabled, the CLKR and FSR get their signals from the CLKX and FSX pads;

instead of the CLKR and FSR pins.

http://s10/mw690/735f2910gd107d7a2c169&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

代码里面，

InitSysCtrl();

// Step 2. Initalize GPIO:
// InitGpio();  

   InitMcbspaGpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
   DINT;

   InitPieCtrl();

   IER = 0x0000;
   IFR = 0x0000;

   InitPieVectTable();

// Step 4. Initialize all the Device Peripherals:

   InitMcbspa();  

 

InitMcbspa(）函数里面使能DBL   McbspaRegs.SPCR1.bit.DLB = 1; 

2, sample rate generator 采样率发生器

http://s3/mw690/735f2910gd11788c080e2&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />
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http://s13/mw690/735f2910gd117ae6626ec&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

http://s9/mw690/735f2910gd11858845848&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

http://s4/mw690/735f2910gd1185faabac3&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

http://s1/mw690/735f2910gd11885833980&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

http://s7/mw690/735f2910gd118d41aa056&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />

Pulses on the receive frame-synchronization (FSR) signal initiate frame transfers on DR. Pulses on the transmit frame-sync (FSX) signal initiate frame transfers on DX. FSR or FSX can be derived from a pin at the boundary of the McBSP or derived from inside the McBSP.

http://s15/mw690/735f2910gd1197047d85e&69028335 的MCBSP 笔记" TITLE="DSP 28335 的MCBSP 笔记" />