Hello eCos list, In my effort to port eCos to a LPC2214-based board, I'm running into some troubles with the serial port. When I load Redboot and execute it, I get garbage data outputted on the serial port, about 80 bytes. The execution then gets stuck attempting to read a character from the console - here is the backtrace at this point:
#0 hal_clock_read (pvalue=0x8101afbc) at /opt/ecos/ecos-cvs/packages/hal/arm/lpc2xxx/var/current/src/lpc2xxx_misc. c:124 #1 0x81006ac0 in delay_us (usecs=0x64) at /opt/ecos/ecos-cvs/packages/hal/common/current/src/hal_if.c:226 #2 0x810126fc in cyg_hal_plf_serial_getc_timeout (__ch_data=0x81018cdc, ch=0x8101b04f "\201dù\001\201\001") at hal_if.h:639 #3 0x8100fe6c in mon_read_char_with_timeout ( c=0x8101b04f "\201dù\001\201\001") at hal_if.h:335 #4 0x81010114 in $a () at /opt/ecos/ecos-cvs/packages/redboot/current/src/io.c:386 #5 0x81010114 in $a () at /opt/ecos/ecos-cvs/packages/redboot/current/src/io.c:386 The key is frame 2, as 1 and 0 are just delaying before polling the device again for data. If I attempt to enter characters, it is not detected by the program. If I build eCos as a library, and build and link a "hello world" app, I get no serial output, but instead for some reason my call to printf prompts a chain of events that ends up calling cyg_hal_plf_serial_getc (which I find odd, since I'm telling it to print to the console, not read from the console..). Here is the stack trace when it is waiting for a character, initially prompted by a call to printf: (arm-gdb) bt #0 cyg_hal_plf_serial_getc_nonblock (__ch_data=0xe0010000, ch=0x81027cbb "_\217") at /opt/ecos/ecos-cvs/packages/hal/arm/lpc2xxx/var/current/src/hal_diag.c:12 4 #1 0x81012a38 in cyg_hal_plf_serial_getc (__ch_data=0x81021298) at /opt/ecos/ecos-cvs/packages/hal/arm/lpc2xxx/var/current/src/hal_diag.c:13 7 #2 0x81003608 in cyg_hal_diag_mangler_gdb_flush (__ch_data=0xe0010000) at hal_if.h:311 #3 0x81003a08 in hal_if_diag_write_char (c=0x0) at hal_if.h:305 #4 0x81015c44 in haldiag_putc (chan=0xe0010000, c=0xbb) at /opt/ecos/ecos-cvs/packages/io/serial/current/src/common/haldiag.c:114 #5 0x81015200 in serial_write (handle=0xe0010000, _buf=0x81027cbb, len=0x81027d7c) at /opt/ecos/ecos-cvs/packages/io/serial/current/src/common/serial.c:331 #6 0x81012f78 in cyg_io_write (handle=0xe0010000, buf=0x81027cbb, len=0x60) at /opt/ecos/ecos-cvs/packages/io/common/current/src/iosys.c:178 #7 0x81015978 in tty_write (handle=0xe0010000, _buf=0x81027cbb, len=0x81027e00) at /opt/ecos/ecos-cvs/packages/io/serial/current/src/common/tty.c:190 #8 0x81012f78 in cyg_io_write (handle=0xe0010000, buf=0x81027cbb, len=0x60) at /opt/ecos/ecos-cvs/packages/io/common/current/src/iosys.c:178 #9 0x8101156c in Cyg_StdioStream::flush_output_unlocked (this=0x81025b14) at io.inl:229 #10 0x81012300 in Cyg_StdioStream::write (this=0x81025b14, buffer=0x8101c9eb "", buffer_length=0x0, bytes_written=0x81027f08) at /opt/ecos/ecos-cvs/packages/language/c/libc/stdio/current/src/common/stre am.cxx:701 #11 0x81006534 in $a () at /opt/ecos/ecos-cvs/packages/language/c/libc/stdio/current/src/output/vfnp rintf.cxx:277 #12 0x81006534 in $a () at /opt/ecos/ecos-cvs/packages/language/c/libc/stdio/current/src/output/vfnp rintf.cxx:277 (arm-gdb) Again, entering a character does not force the application to exit the getc call (I am sure of this, I set a breakpoint following the getc). I know that the serial port and interface to the computer is working fine, as I've tested both with loopback devices and also I have code that manually manipulates the LPC registers to interact with the serial port, and both work fine. Anyone have any suggestions on how I can debug this problem, or ideas on what's causing it? Cheers, Tom Burns -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
