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Hi, I am using the C6711 DSK with a THS1206 Daughter card (ADC with sampling rate up to 6Msps). Currently, my sampling frequency is 100kHz. To perform the data acquisition, I am using an EDMA Channel (configured a channel and a reload) to transfer the data continously from the ADC to the memory of the DSP using a Ping-Pong buffering scheme. During my debbuging phase, I have seen strange things in my results which makes me ask the following questions: 1) I noticed that when I halted the CPU to make some debugging and used the Graph Tool of Code Composer Studio to look at my buffers, the buffers where still updating themselves meaning that the EDMA channel was still transfering data continously. My question is: When the DSP is halted, does the peripherals inside the DSP such as the EDMA, Timers, McBSP, etc. are also halted or they continue doing their work? 2) If I didn't halt the CPU and looked at the buffers using the Code Composer's Graph Tool in real-time, I noticed certain jumps in my signals in a particular pattern (jumps where found approximately every 50 samples). I think that the buffer is updating itself faster than the speed at which the DSP is transfering the data to the Code Composer's Graph Tool. I have my C6711 DSK connected to the parallel port of my computer. My question is: How fast is the JTAG Emulation Port? Can the communication between the DSP and my computer be too slow for real-time debbuging and analysis of buffered data? Any help will be greatly appreciated. -Juan Torres |
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Debugging questions for the C6711
Started by ●March 20, 2004
Reply by ●March 20, 20042004-03-20
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> Date: Sat, 20 Mar 2004 05:18:20 -0000 > From: "trutano" <> > Subject: Debugging questions for the C6711 > > 1) I noticed that when I halted the CPU to make some debugging and > used the Graph Tool of Code Composer Studio to look at my buffers, > the buffers where still updating themselves meaning that the EDMA > channel was still transfering data continously. My question is: When > the DSP is halted, does the peripherals inside the DSP such as the > EDMA, Timers, McBSP, etc. are also halted or they continue doing > their work? Juan, Refer to the Emulation section in the DMA and EDMA chapters of the C6000 peripherals guide. A DMA channel (620x/670x) can be configured to either pause or continue running during an emulation halt. An EDMA channel (621x/641x/671x) always continue running during an emulation halt. This might be not very helpful though. Regards, Andrew > Any help will be greatly appreciated. > > -Juan Torres |
Reply by ●March 22, 20042004-03-22
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Hi, I am also using C6711 DSK, but application in image processing. I could answer several question related to my experience. Q: > 1) I noticed that when I halted the CPU to make some debugging and > used the Graph Tool of Code Composer Studio to look at my buffers, > the buffers where still updating themselves meaning that the EDMA > channel was still transfering data continously. My question is: When > the DSP is halted, does the peripherals inside the DSP such as the > EDMA, Timers, McBSP, etc. are also halted or they continue doing > their work? A: Related to my previous experience in EDMA, the EDMA doesnt stop even the Code Composer already stop running. In order to make the EDMA stop running you must link the EDMA table to the empty Table. Or the easy way you could just use the CSL library command which is EDMA_clearPram(Your_EDMA_channel) and set the breakpoint after this line. Example: 1 .... 2 .... 3 EDMA_clearPram(Your_EDMA_channel) 4 => Put breakpoint in this line 5 .... AFter the program stop in the breakpoint, the EDMA will immediately stop running. I am using this way just for debugging purpose, so I could make sure the EDMA get the correct data. Q: > 2) If I didn't halt the CPU and looked at the buffers using the Code > Composer's Graph Tool in real-time, I noticed certain jumps in my > signals in a particular pattern (jumps where found approximately > every 50 samples). I think that the buffer is updating itself faster > than the speed at which the DSP is transfering the data to the Code > Composer's Graph Tool. I have my C6711 DSK connected to the parallel > port of my computer. My question is: How fast is the JTAG Emulation > Port? Can the communication between the DSP and my computer be too > slow for real-time debbuging and analysis of buffered data? A: How fast is the JTGA Emulation Port it will depend on the interface. If you are using JTAG Emulation which connected using paraller port, the maximum speed will same as the parallel port speed (EPP mode) which is apprx 500kB - 700kb or maybe could be slower. If you need a real time debugging and analysis, I suggested you to buy XDS510 (http://focus.ti.com/docs/toolsw/folders/print/xds510.html), or XDS560 (http://focus.ti.com/docs/toolsw/folders/print/xds560.html). Which XDS is suitable with you, it will depend on you. I hope it could solve your problem Best Regards, Henrry Andrian Graduated Student - ISCI LAB (http://isci.cn.nctu.edu.tw) National Chiao Tung University - Hsinchu, ROC. Lab Phone. +886-3-5712121 ext.54358 Cellular Phone. +886-931-198986 |
