Compiler error when compiling camera app with Mbed 1.10

[dtch1997]

Would appreciate advice on this within the next 2-3 days. I am a complete novice so any bit of information would be useful.

To build a basic camera app for STM32F746-DISCO, I am following the tutorial here: https://developer.arm.com/solutions/machine-learning-on-arm/developer-material/how-to-guides/image-recognition-on-arm-cortex-m-with-cmsis-nn/single-page.

Due to a missing header in Mbed 2.0 (ARMmbed/mbed-cli#805), I am using Mbed 1.10 instead. (Instead of mbed new cmsisnn_demo --mbedlib, I omitted the --mbedlib so it will use Mbed 1.10).

After installing requirements, I try to compile it with:

mbed compile -m DISCO_F746NG -t GCC_ARM --source . --source ../ML-examples/cmsisnn-cifar10/camera_demo/camera_app/

This produces the following error:

BUILD/DISCO_F746NG/GCC_ARM/ML-examples/cmsisnn-cifar10/camera_demo/camera_a
pp/camera_app.o: In function `DCMI_IRQHandler':
/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/../ML-examples/cmsisnn-cifar10/c
amera_demo/camera_app/camera_app.cpp:10: multiple definition of `DCMI_IRQHa
ndler'
BUILD/DISCO_F746NG/GCC_ARM/BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery
/stm32746g_discovery_camera.o:/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/./
BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera
.c:404: first defined here
BUILD/DISCO_F746NG/GCC_ARM/ML-examples/cmsisnn-cifar10/camera_demo/camera_a
pp/camera_app.o: In function `DMA2_Stream1_IRQHandler':
/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/../ML-examples/cmsisnn-cifar10/c
amera_demo/camera_app/camera_app.cpp:13: multiple definition of `DMA2_Strea
m1_IRQHandler'
BUILD/DISCO_F746NG/GCC_ARM/BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery
/stm32746g_discovery_camera.o:/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/./
BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera
.c:413: first defined here
collect2: error: ld returned 1 exit status
[ERROR] BUILD/DISCO_F746NG/GCC_ARM/ML-examples/cmsisnn-cifar10/camera_demo/
camera_app/camera_app.o: In function `DCMI_IRQHandler':
/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/../ML-examples/cmsisnn-cifar10/c
amera_demo/camera_app/camera_app.cpp:10: multiple definition of `DCMI_IRQHandler'
BUILD/DISCO_F746NG/GCC_ARM/BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera.o:/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/./BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera.c:404: first defined here
BUILD/DISCO_F746NG/GCC_ARM/ML-examples/cmsisnn-cifar10/camera_demo/camera_app/camera_app.o: In function `DMA2_Stream1_IRQHandler':
/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/../ML-examples/cmsisnn-cifar10/camera_demo/camera_app/camera_app.cpp:13: multiple definition of `DMA2_Stream1_IRQHandler'
BUILD/DISCO_F746NG/GCC_ARM/BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera.o:/home/dtch009/CMSISNN_Webinar/cmsisnn_demo/./BSP_DISCO_F746NG/Drivers/BSP/STM32746G-Discovery/stm32746g_discovery_camera

[dtch1997]

I resolved this as follows:

Comment out the following code. The camera_app.cpp file then compiles without issue.

/*
extern "C" {
  //defined in stm32746g_discovery_camera.c
  extern DCMI_HandleTypeDef hDcmiHandler;
  void DCMI_IRQHandler(void) {
      HAL_DCMI_IRQHandler(&hDcmiHandler);
  }
  void DMA2_Stream1_IRQHandler(void) {
      HAL_DMA_IRQHandler(hDcmiHandler.DMA_Handle);
  }
}*/