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TDA4VM-Q1: How to call CSL drivers on QNX?

Jasen Leo
Intellectual 470 points
Part Number: TDA4VM-Q1

Hi experts,

SDK: (RTOS + QNX) 7.3

APP: RTOS\vision_apps\apps\utilities\app_load_test

I'm trying to call "CSL_vtmTsConvADCToTemp()" by editing in "app_load_test" demo,

int32_t temp = 0;
CSL_vtmTsConvADCToTemp(607, 0, &temp);
printf("temp = %d\n", temp);
printf("temp!!!!");

and Memory fault (core dumped) occurred.

Process 221203 (app_cpu_load.out) terminated SIGSEGV code=1 fltno=11 ip=0000005cdfebb808(/ti_fs/vision_apps/./app_cpu_load.out@i2128_sw_workaround_needed+0x0000000000000008) mapaddr=000000000000b808. ref=0000000043000300
Memory fault (core dumped)

Question: What should i do for calling CSL driver correctlly?

Thanks,

Jasen

  • +1
    TI__Guru** 121831 points

    Hi Jasen,

    The CSL code is written to run on the R5, where R5 accesses the physical address memory directly. 

    When running on the A72 an MMU is involved and as such the S/W uses a virtual address to access the physical address.   A memory map must be created which creates the virtual address to physical address mapping.  Memory APIs are covered in QNX documentation one example is mmap_device_memory().

    If you compare the below files, you can see how PSDK QNX addressed this by changing the CSL APIs to take a uintptr_t, which when called from the QNX application would have a virtual address as opposed to a physical address.

    • ./pdk_jacinto_07_03_00_29/packages/ti/csl/hw_types.h
    • ./psdkqa/pdk/packages/ti/csl/hw_types.h

    The example code in psdkqa/qnx/examples, will make use of PDK modules which in turn make use of the underlying CSL calls.

    Regards,

    kb