I2S ADC/DAC channels number

[ffomich]

In xSOFTip I2S Master Audio Device Driver have possible ADC/DAC channels number = 2/4/6/8.
Does this component support channels number = 0 (ADC or DAC,
not simultaneously)?

[srinie]

Does this component support channels number = 0 (ADC or DAC,
not simultaneously)?

Channel 0? Do you mean just a mono channel for ADC and DAC functionality?

[ffomich]

Channel 0? Do you mean just a mono channel for ADC and DAC functionality?

No,
ADC_ch_num=0, DAC_ch_num<>0 for dev board with only DAC channels

ADC_ch_num<>0, DAC_ch_num=0 for dev board with only ADC channels

*I think for mono channel ADC/DAC_ch_num=1

[infiniteimprobability]

In theory yes..Although I recall older tools versions had an issue with array of size zero, which happen if I2S_MASTER_NUM_IN or I2S_MASTER_NUM_OUT is set to zero.

However if you have output only for example, then you can't select on the channel communication at the app side.
If you have an app that selects on an output from I2S (which would be the ADC data being sent over) then having no input channel means you can't do that. It would mean you would need to change the code such that you would do the processing, then output to I2S over the channel. The output to I2S, being channel based, will block if I2S is not ready to accept. This means the rate of the app outputting to I2S will be governed by the loop speed of I2S, which is the rate of the I2S LR clock.

So the app code would need to be:

Code: Select all

Init I2S
loop:
do audio processing //make sure this always takes less than LR clock period
output to I2S
goto loop

[lucylee378]

Do you mean just a mono channel for ADC and DAC functionality?




___________________________
http://www.coloradocollege.edu/
http://www.test-king.com/vendor-Microsoft.htm
http://www.coloradomesa.edu/
http://www.test-king.com/
http://www.mines.edu/