Ok, so without seeing any code no one can really answer a question related
to your problem. However, I will say that errors in the realm of "invalid
argument" or "file not found" are development 101 type problems. Also, if
your code is not exiting with an error on these problems I will say that
you're likely not writing your code very defensively either. e.g. error
checking. Which generally is a very bad idea, and usually a sign of a
novice developer.
My point however is not meant to belittle you. But instead it is meant to
say that you really need to learn more in the context of Linux development
in general, and then perhaps find / read a decent howto on spidev.
Another thing. These type of problems are not related to the hardware.
On Mon, Jan 25, 2016 at 6:07 PM, Dean <dean.b...@gmail.com> wrote:
>
>
> *pt-get install build-essential *
>
>
>
> *In 3.8.x spidev2.0 could be used on spi1, but with 4.1.x+ the "first" is
> spidev1 (even if spi1 over spi0..) > *
>
>
> * SPIDevice *busDevice = new SPIDevice(2,0); //Using second SPI bus (both
> loaded)*
>
> *The code is trying to open /dev/spidev2.0, but it's not there*
>
>
> *This should be your first worry-> open("/dev/spidev2.0", O_RDWR) = -1
> ENOENT (No such file or directory)*
>
> Find out why your system thinks this file does not exist. As in perhaps it
> doesn't because you need to load a device tree file as mike mentioned
> above. But also as stated above, there can be many reasons why your
> application does not think this file exists.
>
> So did you tell the BBB to load the spidev interface???
>
> PS.. "4.1.12-ti-r29" was way before i fixed spi/dma.. So you really
> should upgrade: (unless you only plan to send 159 bytes over spi)
>
> cd /opt/scripts/tools/
> git pull
> sudo ./update_kernel.sh --ti-rt-channel --lts-4_1
> cd ~/
>
> git clone https://github.com/
> <https://github.com/beagleboard/bb.org-overlays> --depth=1
> cd ./bb.org-overlays
> ./dtc-overlay.sh
> ./install.sh
>
> Then:
>
> sudo sh -c "echo 'cape_enable=bone_capemgr.
> >> /boot/uEnv.txt"
>
> *Here is an update of the steps performed ...*
>
> *1) I did an update on **apt-get install build-essential*
>
> *2) Change code from ... **SPIDevice *busDevice = new SPIDevice(2,0)*
>
> * to* *SPIDevice *busDevice = new SPIDevice(1,0)*
>
> *3) Updated kernel and ./dtc overlay*
>
> *OUTCOME: The SPIDEV2.0 problem went away – unfortunately shortly
> thereafter my BBB would no longer connect with ssh root@192.168.7.2
> <root@192.168.7.2>. I therefore reloaded back to what I started with
> originally as below.*
>
> *Linux beaglebone 4.1.12-ti-r29 #1 SMP PREEMPT Mon Nov 9 22:46:19 UTC 2015
> armv7l GNU/Linux*
>
> *Linux version 4.1.12-ti-r29 (root@a5-imx6q-wandboard-2gb) (gcc version
> 4.9.2 (Debian 4.9.2-10) ) #1 SMP PREEMPT Mon Nov 9 22:46:19 UTC 2015*
>
> *BeagleBoard.org Debian Image 2015-11-12*
>
> *When I set out again to run natively on my BBB the error changed from ...*
>
> *SPI: SPI_IOC_MESSAGE Failed: Bad file descriptor *
>
> *to *
>
> *SPI: SPI_IOC_MESSAGE Failed: Invalid argument *
>
> *and the SPIDEV2.0 of course went away with libEBBLibrary.so loading and
> SPIDEV1.0 now loading. That said there still remains to be a number of
> directories that are still missing. I am taking this latest error as a sign
> of progress, but I have yet to resolve it. I also should mention that I
> ruled out my laptop, and loading the same configuration on my clunker with
> the same outcome. Here is latests strace ... For brevity I removed portions
> of it because it repeats itself at nauseum.*
>
>
>
> *SPI: SPI_IOC_MESSAGE Failed: Invalid argument*
>
>
> root@beaglebone:~/exploringBB/chp09/LCDcharacter# ls
>
> LCDApp LCDApp.cpp LCDProb build build_static
>
> root@beaglebone:~/exploringBB/chp09/LCDcharacter# strace ./LCDApp
>
> execve("./LCDApp", ["./LCDApp"], [/* 19 vars */]) = 0
>
> brk(0) = 0x8b9000
>
> uname({sys="Linux", node="beaglebone", ...}) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f4d000
>
> access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
>
> open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
>
> fstat64(3, {st_mode=S_IFREG|0644, st_size=26752, ...}) = 0
>
> mmap2(NULL, 26752, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb6f46000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp", 0xbea86370) = -1
> ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/v7l/neon/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/v7l/neon", 0xbea86370) = -1 ENOENT
> (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/v7l/vfp/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/v7l/vfp", 0xbea86370) = -1 ENOENT
> (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/v7l/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/v7l", 0xbea86370) = -1 ENOENT (No
> such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/neon/vfp/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/linux-gnueabihf/tls/neon/vflib/armp", 0xbea86370) = -1 ENOENT
> (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/neon/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/neon", 0xbea86370) = -1 ENOENT (No
> such file or directory)
>
> open("/lib/arm-linux-gnueabihf/tls/vfp/libEBBLibrary.so",
> O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>
> stat64("/lib/arm-linux-gnueabihf/tls/vfp", 0xbea86370) = -1 ENOENT (No
> such file or directory)
>
> *open("/lib/arm-linux-gnueabihf/tls/libEBBLibrary.so", O_RDONLY|O_CLOEXEC)
> = -1 ENOENT (No such file or directory)*
>
> open("/usr/lib/libEBBLibrary.so", O_RDONLY|O_CLOEXEC) = 3
>
> read(3,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0`m\0\0004\0\0\0"..., 512) =
> 512
>
> lseek(3, 95252, SEEK_SET) = 95252
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1200) = 1200
>
> lseek(3, 63425, SEEK_SET) = 63425
>
> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 51)
> = 51
>
> fstat64(3, {st_mode=S_IFREG|0644, st_size=96452, ...}) = 0
>
> mmap2(NULL, 128964, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6f08000
>
> mprotect(0xb6f17000, 65536, PROT_NONE) = 0
>
> mmap2(0xb6f27000, 4096, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0xb6f27000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/usr/lib/arm-linux-gnueabihf/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
>
> read(3, "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0
> n\4\0004\0\0\0"..., 512) = 512
>
> lseek(3, 656784, SEEK_SET) = 656784
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1280) = 1280
>
> lseek(3, 656208, SEEK_SET) = 656208
>
> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 51)
> = 51
>
> fstat64(3, {st_mode=S_IFREG|0644, st_size=658064, ...}) = 0
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f45000
>
> mmap2(NULL, 749256, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6e51000
>
> mprotect(0xb6eed000, 61440, PROT_NONE) = 0
>
> mmap2(0xb6efc000, 24576, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x9b000) = 0xb6efc000
>
> mmap2(0xb6f02000, 24264, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6f02000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
>
> read(3,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0h<\0\0004\0\0\0"..., 512) =
> 512
>
> lseek(3, 405976, SEEK_SET) = 405976
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1160) = 1160
>
> lseek(3, 405640, SEEK_SET) = 405640
>
> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 53)
> = 53
>
> fstat64(3, {st_mode=S_IFREG|0644, st_size=407136, ...}) = 0
>
> mmap2(NULL, 471184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6ddd000
>
> mprotect(0xb6e40000, 61440, PROT_NONE) = 0
>
> mmap2(0xb6e4f000, 8192, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x62000) = 0xb6e4f000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
>
> read(3,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\230\321\0\0004\0\0\0"...,
> 512) = 512
>
> lseek(3, 99900, SEEK_SET) = 99900
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1120) = 1120
>
> lseek(3, 99568, SEEK_SET) = 99568
>
> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 51)
> = 51
>
> fstat64(3, {st_mode=S_IFREG|0644, st_size=101020, ...}) = 0
>
> mmap2(NULL, 165160, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6db4000
>
> mprotect(0xb6dcd000, 61440, PROT_NONE) = 0
>
> mmap2(0xb6ddc000, 4096, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0xb6ddc000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
>
> read(3,
> "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0Mw\1\0004\0\0\0"..., 512) =
> 512
>
> lseek(3, 899996, SEEK_SET) = 899996
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 2880) = 2880
>
> lseek(3, 896548, SEEK_SET) = 896548
>
> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., 53)
> = 53
>
> fstat64(3, {st_mode=S_IFREG|0755, st_size=902876, ...}) = 0
>
> mmap2(NULL, 972200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6cc6000
>
> mprotect(0xb6d9f000, 61440, PROT_NONE) = 0
>
> mmap2(0xb6dae000, 12288, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd8000) = 0xb6dae000
>
> mmap2(0xb6db1000, 9640, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6db1000
>
> close(3) = 0
>
> access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
>
> open("/lib/arm-linux-gnueabihf/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
>
> read(3,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0EQ\0\0004\0\0\0"..., 512) =
> 512
>
> lseek(3, 100684, SEEK_SET) = 100684
>
> read(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1520) = 1520
>
> lseek(3, 65940, SEEK_SET) = 65940
>
> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 53)
> = 53
>
> fstat64(3, {st_mode=S_IFREG|0755, st_size=102204, ...}) = 0
>
> mmap2(NULL, 139836, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0xb6ca3000
>
> mprotect(0xb6cb3000, 61440, PROT_NONE) = 0
>
> mmap2(0xb6cc2000, 8192, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0xb6cc2000
>
> mmap2(0xb6cc4000, 4668, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6cc4000
>
> close(3) = 0
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f44000
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f43000
>
> set_tls(0xb6f434c0, 0xb6f50050, 0xb6f43bb8, 0xb6f434c0, 0xb6f50050) = 0
>
> mprotect(0xb6dae000, 8192, PROT_READ) = 0
>
> mprotect(0xb6cc2000, 4096, PROT_READ) = 0
>
> mprotect(0xb6e4f000, 4096, PROT_READ) = 0
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f42000
>
> mprotect(0xb6efc000, 16384, PROT_READ) = 0
>
> mprotect(0xb6f4f000, 4096, PROT_READ) = 0
>
> munmap(0xb6f46000, 26752) = 0
>
> set_tid_address(0xb6f43068) = 586
>
> set_robust_list(0xb6f43070, 12) = 0
>
> rt_sigaction(SIGRTMIN, {0xb6ca7d9d, [], SA_RESTORER|SA_SIGINFO,
> 0xb6cecae1}, NULL, 8) = 0
>
> rt_sigaction(SIGRT_1, {0xb6ca7cbd, [], SA_RESTORER|SA_RESTART|SA_SIGINFO,
> 0xb6cecae1}, NULL, 8) = 0
>
> rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
>
> getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
>
> futex(0xb6f06ce8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>
> futex(0xb6f06cdc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f4c000
>
> write(1, "Starting EBB LCD Character Displ"..., 43Starting EBB LCD
> Character Display Example
>
> ) = 43
>
> brk(0) = 0x8b9000
>
> brk(0x8da000) = 0x8da000
>
> open("/dev/spidev1.0", O_RDWR) = 3
>
> ioctl(3, 0x40016b01, 0x8b901c) = 0
>
> ioctl(3, 0x80016b01, 0x8b901c) = 0
>
> ioctl(3, 0x40046b04, 0x8b9024) = 0
>
> ioctl(3, 0x80046b04, 0x8b9024) = 0
>
> ioctl(3, 0x40016b03, 0x8b9020) = 0
>
> ioctl(3, 0x80016b03, 0x8b9020) = 0
>
> ioctl(3, 0x40046b04, 0x8b9024) = 0
>
> ioctl(3, 0x80046b04, 0x8b9024) = 0
>
> ioctl(3, 0x40206b00, 0xbea86a30) = 1
>
> nanosleep({0, 1520000}, NULL) = 0
>
> ioctl(3, 0x40206b00, 0xbea86a30) = -1 EINVAL (Invalid argument)
>
> dup(2) = 4
>
> fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
>
> fstat64(4, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f4b000
>
> _llseek(4, 0, 0xbea86910, SEEK_CUR) = -1 ESPIPE (Illegal seek)
>
> write(4, "SPI: SPI_IOC_MESSAGE Failed: Inv"..., 46SPI: SPI_IOC_MESSAGE
> Failed: Invalid argument
>
> ) = 46
>
> close(4) = 0
>
> munmap(0xb6f4b000, 4096) = 0
>
> nanosleep({0, 37000}, NULL) = 0
>
> ioctl(3, 0x40206b00, 0xbea86a30) = -1 EINVAL (Invalid argument)
>
> dup(2) = 4
>
> fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
>
> fstat64(4, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
>
> *mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0xb6f4b000*
>
> --
> For more options, visit http://beagleboard.org/discuss
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