PDM & TWI aren't working together well (SDK 15.3.0)

[Or]

Hi,

I have similar problem to what is described here.

My situation:
1. I connect 2 PDM mics to the board (CLK is pin 27, Din is pin 26).
2. I connect a couple of TWI (I2C) sensors to the board (SCL is ARDUINO_13_PIN, SDA is ARDUINO_12_PIN, NRF_DRV_TWI_FREQ_400K, APP_IRQ_PRIORITY_HIGH)
3. I connect *same model of sensors* sensors (MAX3010) to the board (SCL is ARDUINO_11_PIN, SDA is ARDUINO_10_PIN, NRF_DRV_TWI_FREQ_400K, APP_IRQ_PRIORITY_HIGH)

When I enable 1 alone (only audio) all is fine.
When I enable 2 & 3 (all I2C sensors) all is fine.

When I enable 1 & 2 & 3 I start seeing problems:
1. I seem to miss some of the timer cycles of the I2C sensors (100Hz timer) and some of the PDM callbacks too.
2. every few times of running the firmware it crashes with "<error> app: ERROR 17 [NRF_ERROR_BUSY] at /home/oberon/opt/nRF5_SDK_15.3.0/components/libraries/log/src/nrf_log_backend_uart.c:83".
This happens in SEGGER IDE. the backtrace doesnt show where this originated so I cant debug this.

I'm using nRF52840-DK and SDK 15.3.0.

Is this a known issue ? was this solved since the original post was posted ? didnt see a solution there.

[Håkon]

Hi,

Good that your program does not crash anymore!
Which lagging are you referring to?

Btw, did you try to run you program with RTT istead of UART to preserve logging?

The case you refer to ended since the developer who raised the issue didn't follow up our answers. 
This is not a known issue to our knowledge.