please help. (sorry for my english)

I try to compile helloworld code from this guide: http://gargoyle-router.com/old-openwrt-coding.html
it's compiled and i can run it on my tp-link mr3020 (attitude_adjustment)

Ok. now i want compile sample code from http://www.intra2net.com/en/developer/l … mentation/
i take code from this page and insert it into helloworld.c and run make. In this case code does not compile with next error:

" undefined reference to 'ftdi_usb_close' " (this is function from ftdI.h)

so my question is
Why compiler cannot find and include "ftdi.h" but can find and include "stdio.h" if they locate in one folder (/usr/include/)?

and

HOW i can get success? (step by step)

p.s. i also try use -MD key for generate *.d file with paths to header file and include this *.d file to makefile.

Thanks

(Last edited by tregub on 4 Nov 2012, 19:33)

You have the source code from libftdi?

yes, i take source code from this page http://www.intra2net.com/en/developer/l … mentation/

i use http://downloads.openwrt.org/attitude_a … .2.tar.bz2

(Last edited by tregub on 4 Nov 2012, 19:26)

AFAIK, /usr/include is your host system include directory. OpenWRT include directory is under $(STAGING_DIR)/usr/include.

i try put file ftdi.h into $(STAGING_DIR)/usr/include but it does not solve my problem

i do next steps:

1. install debian on virtualbox
2. install libftdi
3. download and unpack http://downloads.openwrt.org/attitude_a … .2.tar.bz2

4. create folder "helloworld" in OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/package

5. create folder "src" in OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/package

6. create file helloworld.c in OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/package/src

#include <stdio.h>
#include <ftdi.h>

int main(void)
{
    int ret;
    struct ftdi_context ftdic;
    if (ftdi_init(&ftdic) < 0)
    {
        fprintf(stderr, "ftdi_init failed\n");
        return EXIT_FAILURE;
    }

    if ((ret = ftdi_usb_open(&ftdic, 0x0403, 0x6001)) < 0)
    {
        fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
        return EXIT_FAILURE;
    }

    // Read out FTDIChip-ID of R type chips
    if (ftdic.type == TYPE_R)
    {
        unsigned int chipid;
        printf("ftdi_read_chipid: %d\n", ftdi_read_chipid(&ftdic, &chipid));
        printf("FTDI chipid: %X\n", chipid);
    }

    if ((ret = ftdi_usb_close(&ftdic)) < 0)
    {
        fprintf(stderr, "unable to close ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
        return EXIT_FAILURE;
    }

    ftdi_deinit(&ftdic);

    return EXIT_SUCCESS;
}

7. create Makefile in OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/package/src

helloworld: helloworld.o
    $(CC) $(LDFLAGS) helloworld.o -o helloworld
helloworld.o: helloworld.c
    $(CC) $(CFLAGS) -c helloworld.c

clean:
    rm *.o helloworld

8. create Makefile in OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/package

include $(TOPDIR)/rules.mk

PKG_NAME:=helloworld
PKG_RELEASE:=1

PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define Package/helloworld
    SECTION:=utils
    CATEGORY:=Utilities
    TITLE:=Helloworld -- prints a snarky message
endef

define Build/Prepare
    mkdir -p $(PKG_BUILD_DIR)
    $(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Package/helloworld/install
    $(INSTALL_DIR) $(1)/bin
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/
endef

$(eval $(call BuildPackage,helloworld))

8. go to OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2 directory (cd /home/tregub/Downloads/OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2)

9. do "make V=s"

10.  undefined reference to 'ftdi_usb_close'
undefined reference to 'ftdi_deinit' etc
collect2: ld returned 1 exit status

Whats wrong?

R U aware of and/or have you tried to compile the feeds/packages/libs/libftdi package from OpenWRT SVN trunk?