Two CS42448 chips interfacing with I2S and I2S1

[Neal]

I want to separately interface two separate CS42448 chips to one Teensy 4.1. But before I try this I want to ask if an assumption I am making is valid.

Assuming nothing else is connected to the Teensy 4.1 my assumption is I can use I2S (Teensy pins 21, 23, 7, 8, 20) for the first CS42448, and that I can use I2S1 (Teensy pins 4, 33, 2, 5, 3) for the second CS42448. The audio library objects I would be using for this are tdm1/tdm2 for the first CS42448 and tdm2_1/tdm2_2 for the second CS42448.

Two questions:
1. Are my above assumptions correct?
2. Is there an example that someone can point me to that uses some of the functions in the Audio Library control_cs42448.cpp/control_cs42448.h routines?

I know there are other efforts to use a single TDM with two CS42448s, but I would like to know if my brute force interfacing plan makes sense.

Thanks in advance for the sanity check.

 

[Frank B]

It should work to connect them to different I2S.

When you open the .h file, you will also see the available functions:
https://github.com/PaulStoffregen/Audio/blob/master/control_cs42448.h#L36

class AudioControlCS42448 : public AudioControl
{
public:
    AudioControlCS42448(void) : i2c_addr([COLOR=#000000]0x48[/COLOR]), muted(true) { }
    [COLOR=#ff0000][B]void setAddress(uint8_t addr) [/B][/COLOR]{
        i2c_addr = 0x48 | (addr & 3);
    }
    bool enable(void);
    bool disable(void) {
        return false;
    }
    bool volume(float level) {
        return volumeInteger(volumebyte(level));
    }
    bool inputLevel(float level) {
        return inputLevelInteger(inputlevelbyte(level));
    }
    bool inputSelect(int n) {
        return (n == 0) ? true : false;
    }
    bool volume(int channel, float level) {
        if (channel < 1 || channel > 8) return false;
        return volumeInteger(channel, volumebyte(level)); 
    }
    bool inputLevel(int channel, float level) {
        if (channel < 1 || channel > 6) return false;
        return inputLevelInteger(channel, inputlevelbyte(level));
    }
private:
[...]

I had almost overseen that it allows to set the I2C address.

 

[Neal]

Yes I saw the function that allows multiple I2C addresses. I was hoping to also find an example sketch that uses some of the control_cs42448 functionality and possibly and example that interfaces with the input_tdm and output_tdm audio library elements.

Thanks for your confirmation that you think it should work.