RTOS/LAUNCHXL-CC1350-4: Porting pdmstream example to use with MP34DT01 PDM mic.

Rich Gabrielson

Part Number: LAUNCHXL-CC1350-4
Other Parts Discussed in Thread: CC1350STK

Tool/software: TI-RTOS

The taskFxn code fails to start streaming in response to the "start stream" button because PDMCC26XX_open returns a NULL handle.

At a breakpoint in PDMCC26XX_open in PDMCC26XX.c (line 360, if (!activePcmBuffer)). PDMCC26XX_getNewPcmBuffer(pdmHandle) on the previous line seems to have returned a valid address because activePcmBuffer has changed from 0 to 0x20001678. However, the if block is entered (as if activePcmBuffer were NULL), causing PDMCC26XX_open to return NULL.

As far as I can tell from its data sheet the MP34DT01 mic should work with the pdmstream example. I've modified the CC1350STK board files in the project and got the button and LED I/O's reassigned correctly though I haven't gotten far enough along to verify that the I2S I/O is correct. The problem I'm having doesn't seem to have any dependence on board I/O. The pdmstream example I imported inherits CC13x0 SDK version 1.60.0.21 from the CC1350STK_release dependency. What am I missing?

Thanks,

Rich

over 7 years ago

0 IUsedToBeARealPerson (M-W) over 7 years ago

TI__Guru 58425 points

Hi Rich,

It seems strange that it would enter the if statement if the variable did indeed was not NULL. Have you turned of optimizations when stepping over the driver?

Also, are you using the library version or have you added the actual PDMCC26XX.c file to the project? The later is recommended as this will make it easier to debug due to the optimization in the library version.

0 Rich Gabrielson over 7 years ago in reply to IUsedToBeARealPerson (M-W)

Prodigy 130 points

Thanks! Adding a copy of PDMCC26XX.c to the project has indeed made debug easier. On to the next problem <grin>!

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RTOS/LAUNCHXL-CC1350-4: Porting pdmstream example to use with MP34DT01 PDM mic.