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CyU3PDmaMultiChannelCommitBuffer() returns error code 71 (CY_U3P_ERROR_INVALID_SEQUENCE)
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CyU3PDmaMultiChannelCommitBuffer() returns error code 71 (CY_U3P_ERROR_INVALID_SEQUENCE)

Sil posted on 20 Jul 2012 12:54 AM PST
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93 Forum Posts

Hi

 

I have created a manual  DMA multi channel. When I commit the data to the consumer, sometimes the function fails, returning error code 71. To find the root cause for this, I am wondering what can cause this error code. Does anybody have some more details on this? Thanks.

 

-Silvio

Re: CyU3PDmaMultiChannelCommitBuffer() returns error code 71 (CY_U3P_ERROR_INVALID_SEQUENCE)

GL_basik posted on 20 Jul 2012 06:51 AM PST
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24 Forum Posts

Hi, Sil

I had the same error in my firmware. I think that it occur when all buffers  in multidmachanel  is full. Now I check are there any empty buffer before calling CyU3PDmaMultiChannelCommitBuffer.



Re: CyU3PDmaMultiChannelCommitBuffer() returns error code 71 (CY_U3P_ERROR_INVALID_SEQUENCE)

Sil posted on 20 Jul 2012 07:13 AM PST
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93 Forum Posts

I have now added additional logic that should prevent buffer overflow. If there is no free bufer available, I will call CyU3PDmaMultiChannelDiscardBuffer() to drop the current input buffer. However, I still get return value 71 after some time. I added a call to CyU3PDmaMultiChannelGetStatus() and found that status of DMA channel is DMA_ACTIVE. Does it mean I cannot discard the current producer buffer if DMA is active?

Re: CyU3PDmaMultiChannelCommitBuffer() returns error code 71 (CY_U3P_ERROR_INVALID_SEQUENCE)

Sil posted on 20 Jul 2012 07:14 AM PST
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93 Forum Posts

Just to clarify: Now I get return value 71 from CyU3PDmaMultiChannelDiscardBuffer()



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