SPC560B eDMA故障

（参考手册RM0037）EDMA_ERQRL下有一节说
 
 “在接受通道的硬件服务请求之前，必须先断言eDMA请求输入信号和此使能请求标志。”
 
 但是除了''设置位1（CERQ [0]）提供全局清除功能，强制EDMA_ERQRL的全部内容归零，禁用所有eDMA请求时，我找不到任何其他对“请求输入信号”的引用输入。“”
 
 
 这表明它们是一回事？
 
 如果没有，我是否应该做任何事情让它产生硬件请求？
 
 （顺便说一下：我正试图通过DMA运行SPI，但无论有没有SPI代码，似乎都有完全相同的问题，所以我现在假设这是一个DMA问题）



以下为原文





(Reference Manual RM0037) Has a section under EDMA_ERQRL saying

  ''Both the eDMA request input signal and this enable request flag must be asserted before a channel’s hardware service request is accepted.''
  
But I can't find any other references to a 'request input signal' other than ''Setting bit 1 (CERQ[0]) provides a global clear function, forcing the entire contents of the EDMA_ERQRL to be zeroed, disabling all eDMA request inputs.''

  
Which suggests that they are the same thing??
  
If not, should I have to do anything to let it produce Hardware requests?
  
(BTW: I'm trying to run SPI via DMA but seem to be having exactly the same issues both with and without the SPI code, so am currently assuming it's a DMA problem)

你好Patrick，
 
 
如果您想使用eDMA硬件，您应该注意：
 
TCD.D_REQ
禁用硬件请求。如果设置了此标志，则为eDMA硬件
当自动清除相应的EDMA_ERQRL位时
当前主要迭代计数达到零。
0通道的EDMA_ERQRL位不受影响。
1当外部主循环时，通道的EDMA_ERQRL位清零
很完美
 
在SPC5studio中，Giovanni提供了一个很好的edma设置示例;-)
DSPI应用程序
spi和edma（cf spc5_edma.c和spi_lld.c）
 
 
 
 
 
 
 
 
 最好的祝福
 
 二万



以下为原文





Hello Patrick ,


If you want to use eDMA Hardware , you should take care of  :

TCD.D_REQ
Disable hardware request. If this flag is set, the eDMA hardware
automatically clears the corresponding EDMA_ERQRL bit when the
current major iteration count reaches zero.
0 The channel’s EDMA_ERQRL bit is not affected.
1 The channel’s EDMA_ERQRL bit is cleared when the outer major loop
is comple   

in SPC5studio , there is a nice example of edma settings made by Giovanni ;-)
DSPI Applications
spi and edma (cf spc5_edma.c and spi_lld.c)

• /**
  

• 
  

• * @brief   EDMA driver initialization.
  

• 
  

• *
  

• 
  

• * @special
  

• 
  

• */
  

• void
  

• edmaInit(
  

• void
  

• ) {
  

•   
  

• unsigned i;
  

•   
  

• SPC5_EDMA.CR.R    = SPC5_EDMA_CR_SETTING;
  

•   
  

• SPC5_EDMA.ERQRL.R = 0x00000000;
  

•   
  

• SPC5_EDMA.EEIRL.R = 0x00000000;
  

•   
  

• SPC5_EDMA.IRQRL.R = 0xFFFFFFFF;
  

•   
  

• SPC5_EDMA.ERL.R =   0xFFFFFFFF;
  

• #if SPC5_EDMA_NCHANNELS > 32
  

•   
  

• SPC5_EDMA.ERQRH.R = 0x00000000;
  

•   
  

• SPC5_EDMA.EEIRH.R = 0x00000000;
  

•   
  

• SPC5_EDMA.IRQRH.R = 0xFFFFFFFF;
  

•   
  

• SPC5_EDMA.ERH.R =   0xFFFFFFFF;
  

• #endif
  

•   
  

• /* Initializing all the channels with a different priority withing the
  

•      
  

• channels group.*/
  

•   
  

• for
  

• (i = 0; i < 16; i++) {
  

•    
  

• SPC5_EDMA.CPR.R = g0;
  

• #if SPC5_EDMA_NCHANNELS > 16
  

•    
  

• SPC5_EDMA.CPR[i + 16].R = g1;
  

• #endif
  

• #if SPC5_EDMA_NCHANNELS > 32
  

•    
  

• SPC5_EDMA.CPR[i + 32].R = g2;
  

•    
  

• SPC5_EDMA.CPR[i + 48].R = g3;
  

• #endif
  

•   
  

• }
  

• 
  

• /**
  

• 
  

• * @brief   Starts or restarts an EDMA channel.
  

• 
  

• *
  

• 
  

• * @param[in] channel   the channel number
  

• 
  

• *
  

• 
  

• * @api
  

• 
  

• */
  

• #define edmaChannelStart(channel) (SPC5_EDMA.SERQR.R = (channel))
  

• /**
  

• 
  

• * @brief   Stops an EDMA channel.
  

• 
  

• *
  

• 
  

• * @param[in] channel   the channel number
  

• 
  

• *
  

• 
  

• * @api
  

• 
  

• */
  

• #define edmaChannelStop(channel) {                                          
  

•   
  

• SPC5_EDMA.CERQR.R = (channel);                                            
  

•   
  

• SPC5_EDMA.CDSBR.R = (channel);                                            
  

• }
  

Best regards

          Erwan

Erwan感谢您的回复，
 
 我（/ am）已经使用该代码作为参考，并且通常发现它非常有用。
 
 原来我遇到的问题是我用DMA_MUX将DMA通道链接到源。
 我现在已经修好了，所以谢谢你的帮助。
 
 帕特里克



以下为原文





Erwan thanks for the reply,

I was (/am) already using that code as a reference, and in general finding it very useful.

Turns out the issue I was having was with my linking of the DMA channel to the source with the DMA_MUX.
I've fixed it now, so thankyou for the assist.  

Patrick