Using two I2s instances on PSoC6 CY8CPROTO-062-4343 kit

[shsh_4753781]

Hello,

I am trying to use two I2S instances to design a project for collecting data using im69d130 microphone shield2go from Infineon. As per the datasheet, I can use two I2S block. One is on port5 and other on port 11.

However, to startwith, I am trying to initialise I2S but initialisation fails. I am making use of HAL library.

Should I configure clocks for Shield2Go board, it has three pins: DATA, SCLK,WCLK? Is I2S instance master or slave?

How in general we can read mic data using m69d130 microphone shield2go.

My code looks like this:

1) cyhal_i2s_t i2s_0;
const cyhal_i2s_pins_t i2s_0_rx_pins = { .sck = P5_4, .ws = P5_5, .data =
P5_6 };
const cyhal_i2s_config_t i2s_0_config = { .is_tx_slave = false,
.is_rx_slave = true, .mclk_hz = 0, .channel_length = 16,
.word_length = 16, .sample_rate_hz = 24000u };
cy_rslt_t result = cyhal_i2s_init(&i2s_0, NULL, &i2s_0_rx_pins,
NC, &i2s_0_config, NULL);

 The result variable is expected to return 0 if everything goes well. It return me a big integer number that means I2S was not initialised. Can you tell me how to proceed?

2 ) Also, is there a way to see the value of variable with out optimisation? While debugging, I see <optismized value>.

I tried to use volatile keyword like volatile cy_rslt_t result , but I dont want to use it all the time. Is there away to turn off optimisation in debug mode? updating CXXXFlags in project make file does not work. 

I used emptyPSoC app to create the project.

Thankyou.

[RodolfoGL · Accepted solution]

The initialization might be failing due to one of the following reasons:

- Some of the I2S pins are being used by another block (CYHAL_I2S_RSLT_ERR_INVALID_PIN)

- Not able to achieve the desired sample rate (CYHAL_I2S_RSLT_ERR_CLOCK)

If you sort out the optimization issue with the cy_result, it would be nice to know which value was returned. You could also run in debug mode and enter to the cyhal_i2s_init() function to see exactly where is failing.

[shsh_4753781]

The issue was with the clock. Now I can initialize the I2S blocks.

https://github.com/Infineon/mtb-example-psoc6-pdm-to-i2s

Refer to the clock_init() function.

This helped. Thankyou.

[shsh_4753781]

Hi RodolfoGL,

Thank you for the reply. Do I have to init the clock before calling cyhal_i2s_init(). Which clocks to initialise and also do I have to enable them? Clock might be one reason for failing. Do you have a code snippet of clock initialisation before calling i2s_init() ?

Not able to solve the optimisation issue till now.

Thanks

[RodolfoGL]

In PSoC 6, the I2S uses the HFCLK1. If you haven't configured that in the Device Configurator, you can do it using the clock HAL driver. Refer to this code example:

https://github.com/Infineon/mtb-example-psoc6-pdm-to-i2s

Refer to the clock_init() function.