Hi, I have very odd problem: test code that works as "main.c" does not work as "main.cpp"I have PCB with XMC4700 an SD card connected over SPI (pins M...
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Hi, I have very odd problem: test code that works as "main.c" does not work as "main.cpp"
I have PCB with XMC4700 an SD card connected over SPI (pins MISO P3.14, MOSI P3.15, SCLK P0.13 and Slave select P0.12).
I made a test project, where I'm using DAVE apps "FATFS", connected to "SD_MMC_BLOCK" -> "SPI_MASTER" and "RTC" - everything except pins was configured using DAVE.
Then I have "standard" SD CARD test method from an example, which creates a file, a folder, writes into file ("Hello world") and reads it... and everything works fine from "main.c".
Then I tried to integrate everything in another project, made in C++. There were a lot of errorsand i spent a lot of time withous success, becouse of errors in DAVE generated files. Something with differences between C and C++ that I don't completley understand.
So went back my test project. I only changed name of main file from "main.c" to "main.cpp" and i got the same errors in my test app. The errors are:
/Dave/Generated/FATFS/fatfs.h:163:16: error: using typedef-name 'FATFS' after 'struct'
typedef struct FATFS
/Dave/Generated/FATFS/fatfs.h:169:10: error: invalid type in declaration before ';' token
} FATFS_t;
I also get message:
/Dave/Generated/FATFS/ff_Src/ff.h:176:3: note: 'FATFS' has a previous declaration here
} FATFS;
The issue is that in DAVE generated files "FATFS" is defined twice:
/Dave/Generated/FATFS/ff_Src/ff.h:
typedef struct {
BYTE fs_type; /* Filesystem type (0:not mounted) */
BYTE pdrv; /* Associated physical drive */
BYTE n_fats; /* Number of FATs (1 or 2) */
...code has been shortened...
} FATFS;
and in /Dave/Generated/FATFS/fatfs.h:
typedef struct FATFS
{
#if (FF_FS_NORTC == 0U)
RTC_t * rtc_handle; /** < RTC APP handle pointer */
#endif
bool initialized; /**< FATFS initialization status*/
} FATFS_t;
This obviously works well for C, but not for C++
I tried "extern C" in main.cpp where DAVE.h is included, but wih the same errors:
//code from begin of main.cpp:
extern "C"{
#include <DAVE.h> //Declarations from DAVE Code Generation (includes SFR declaration)
}
As far as I read, this shouls solve the issue, besouse all code in DAVE.h and included files should be treated as "regular C". Problem is that i MUST include this library into C++ project.
Any help will be highly appreciated 🙂
Best regards, Martin
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