Hi Team,
I am sending 8kHz audio data from a PC to the EVM OMAP L137/C6747. When I try to receive one packet for every 10msec ( packetsize =80 words, each word of 16bit length. If I need to receive 8000 or 8Kilo words in 1 sec, then I need to receive 80 words (1 packet) in 10ms.), the recv() function in the DSP board(EVM OMAP L137/C6747) wouldnt receive! (To obtain 8KHz sampling rate, I changed the crystal near codec from 24MHz to 2.048MHz)
But the same code works perfectly fine (that is, it can receive 1 packet every 5 ms for 16KHz sampling rate - of course after changing the ACLKRCTL and ACLKXCTRL to 16KHz and also the codec's sampling rate to 16KHz (that is 48KHz divided by 3). I have also tried this out for 96KHz sampling rate-with the same program what I am using for 8KHz and 16KHz- it works fine there too.
I dont think there is any mistake in the rate at which i am receiving, because I used the same program to transmit udp packets at 8KHz and I am able to transmit at 8KHZ perfect. Only recv() at 8Khz is a problem. Also I used the oscilloscope to see if the ping pong buffer alternates every 10ms(using GPIO pins) and it does.
Can you please do a quick test to see if UDP recv()works for C6747 at 8KHz(that is, it is capable of receiving 80 word packet size for every 10ms - using oscilloscope)? I am using ndk2.0.0.0 and bios: 6.32.2.30 and xdc tools: 3.22.1.21, xdais: 7.10.0.06, interprocessor communication: 1.23.2.27
When I use recv() at 4KHz, it is working but the moment I make to recv() data from the PC to DSP board via UDP for 8KHz, even the audio pass through is not working - not working in the sense, a tic tic noise heard in background and everything is echoed.
Been going around in days for this issue. Please let me know if EVM OMAP L137/C6747 will work for UDP recv() at 8KHz. I also made McASP as slave and codec as master- but still this doesnot help.
