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Hello, I'm currently trying to get an algorithm to run in real-time, but I am running out of MIPs. Here are the specifics and I appreciate any suggestions offered. The algorithm itself takes 1.6 msec to process. My sample rate is set to 8 kHz. Framesize = 16 (really I'm reading in 32 stereo samples at a time, but the motorola reads the right and left at the same times so it's the equivalent of 16) This means that I'm grabbing samples using an interupt every 2msec, trying to process them, which takes 1.6 msec, and writing them out. I'm using the low-level Codec Driver API described 6.2.5 of the Embedded SDK Targeting Motorola DSP5685x Platform manual. Of course they don't specifically say how resource intesive this API is, but is it really taking more than .4msec? I have three questions: 1) Are there any drawbacks to putting my main processing algorithm in an interupt? My main function is just a never ending empty while loop and I'm using a CODEC_RX_CALLBACK interupt service routine to read, process and write data. Essentially I've used codec.mcp from C:\Program Files\Motorola\Embedded SDK\src\dsp56858evm\nos\applications\bsp\codec as my skeleton. 2) If the codec interface that I'm using or if the way that I'm using it is inefficient, could someone please recommend an efficient method? 3) Does anyone know how many MIPs this processor is capable of? I know the clock runs at 120 Mhz, but I'm usure of the actual processing bandwidth. I think my code runs at about 80 MIPs because a collegue at work has the same program running on a TI 5402 and he has measured it. Thank you all in advance, Rob |
need an Efficient Codec Interface method for 56858EVM
Started by ●December 11, 2002
