BF706 ezlite mini input and output data types

void RX_ISR(uint32_t iid, void *handlerArg)
{
    if (*pREG_DMA1_STAT & ENUM_DMA_STAT_IRQDONE)
        *pREG_DMA1_STAT = ENUM_DMA_STAT_IRQDONE;

    channel[codec_Left] = lrbits(bufferRx[codec_Left]);
    channel[codec_Right] = lrbits(bufferRx[codec_Right]);

    xS[0] = lrbits(bufferRx[codec_Right]);
	for(i = orderS - 1; i > 0; i--)
	{
		xS[i] = xS[i - 1];
	}

    bufferTx[codec_Left] = bitslr(output);
    bufferTx[codec_Right] = bitslr(xS[0]);
}

Hi Anthony,

Can you please explain more about your application? From your code snippet I believe you performing audio talk-through application on ADSP-BF706 mini. Correct? A simple block diagram would be helpful on assisting you better on this issue.
You mentioned, "I sent 1 kHz (100 mVRMS) to the BF706 ezlite mini and after I changed it to long fract or float, I got 0.0003. When I sent back to Audio Precision, it showed 81.2 mVRMS.". Do you mean that you are changing the variables to long fract/float somewhere in the code? Is yes, does the code work correctly if you do not change it?

BTW, are you implementing any filtering algorithm in the code?

You can also take a look at the example code provided in the Board Support Package for some additional information. The path of the example code is given below
<Installation path>\Analog Devices\ADSP-BF706_EZ-KIT_Mini-Rel1.1.0\BF706_EZ-Kit_MINI\Blackfin\Examples

The BSP can be downloaded from the below link.
download.analog.com/.../ADI_ADSP-BF706_EZ-KIT_Mini-Rel1.1.0.exe

Regards,
Lalitha S

Hi Anthony,

Can you please explain more about your application? From your code snippet I believe you performing audio talk-through application on ADSP-BF706 mini. Correct? A simple block diagram would be helpful on assisting you better on this issue.
You mentioned, "I sent 1 kHz (100 mVRMS) to the BF706 ezlite mini and after I changed it to long fract or float, I got 0.0003. When I sent back to Audio Precision, it showed 81.2 mVRMS.". Do you mean that you are changing the variables to long fract/float somewhere in the code? Is yes, does the code work correctly if you do not change it?

BTW, are you implementing any filtering algorithm in the code?

You can also take a look at the example code provided in the Board Support Package for some additional information. The path of the example code is given below
<Installation path>\Analog Devices\ADSP-BF706_EZ-KIT_Mini-Rel1.1.0\BF706_EZ-Kit_MINI\Blackfin\Examples

The BSP can be downloaded from the below link.
download.analog.com/.../ADI_ADSP-BF706_EZ-KIT_Mini-Rel1.1.0.exe

Regards,
Lalitha S

Sorry, my fault. I already solved it, it's the matter of bits. At first, I used lrbits to get 32 bits data from a 24 bit ADC which is wrong. I solved by changing the ADC to 16 bits and put the data to 16 bits buffer instead. Thanks a lot for the reply, I'm really sorry for the inconvenience.

Hi Anthony,

Thanks for the update.

Regards,
Lalitha.S