How to properly include tinyusb in the examples

[barbiani]

Hi,

I am expanding the flash_stream example with usb functionality can the build is failing with:

/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: CMakeFiles/flash_stream.dir/flash_stream.c.obj: in function `render_loop':
flash_stream.c:(.time_critical.render_loop+0x8a): undefined reference to `tud_task'
/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: CMakeFiles/flash_stream.dir/flash_stream.c.obj: in function `vga_main':
flash_stream.c:(.text.vga_main+0x3a): undefined reference to `tud_init'
collect2: error: ld returned 1 exit status
make[2]: *** [scanvideo/flash_stream/CMakeFiles/flash_stream.dir/build.make:1129: scanvideo/flash_stream/flash_stream.elf] Error 1
make[1]: *** [CMakeFiles/Makefile2:2439: scanvideo/flash_stream/CMakeFiles/flash_stream.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

Something is not going right with the library include I suspect.

I have modified the example cmakelists.txt to be:

if (PICO_ON_DEVICE AND TARGET pico_scanvideo_dpi)
    include(${PICO_SDK_PATH}/lib/tinyusb/hw/bsp/family_support.cmake)

    family_initialize_project(flash_stream ${CMAKE_CURRENT_LIST_DIR})

    add_executable(flash_stream
            flash_stream.c
            usb_descriptors.c
            )
    target_link_libraries(flash_stream PRIVATE
            pico_multicore
            pico_stdlib
            pico_scanvideo_dpi
            hardware_dma
            tinyusb_board
            tinyusb_device
            )
    target_compile_definitions(flash_stream PRIVATE
            PICO_SCANVIDEO_MAX_SCANLINE_BUFFER_WORDS=500
            )
    target_include_directories(flash_stream PUBLIC
        ${CMAKE_CURRENT_LIST_DIR})
    pico_add_extra_outputs(flash_stream)
    pico_enable_stdio_usb(flash_stream 0)
    pico_enable_stdio_uart(flash_stream 0)
    # Uncomment this line to enable fix for Errata RP2040-E5 (the fix requires use of GPIO 15)
    #target_compile_definitions(flash_stream PUBLIC PICO_RP2040_USB_DEVICE_ENUMERATION_FIX=1)
    pico_add_extra_outputs(flash_stream)
    family_configure_device_example(flash_stream)
endif ()

And flash_stream.c includes:

#include "tusb_config.h"
#include "bsp/board.h"
#include "device/usbd.h"
#include "class/hid/hid_device.h"
#include "tusb.h"

It does compile the file containing the missing functions:

[ 80%] Building C object scanvideo/flash_stream/CMakeFiles/flash_stream.dir/home/barbiani/pico-sdk/lib/tinyusb/src/portable/raspberrypi/rp2040/rp2040_usb.c.obj
[ 81%] Building C object scanvideo/flash_stream/CMakeFiles/flash_stream.dir/home/barbiani/pico-sdk/lib/tinyusb/src/device/usbd.c.obj
[ 82%] Building C object scanvideo/flash_stream/CMakeFiles/flash_stream.dir/home/barbiani/pico-sdk/lib/tinyusb/src/device/usbd_control.c.obj

I have followed other tinyusb examples and included what I found to be necessary, but the linking step is still failing.

Any clues?

Thank you.