printf doesn't work

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Read-Only Author Michal Ogard Posted 19-Jun-2006 15:05 GMT Toolset ARM	printf doesn't work Michal Ogard I'm trying to use printf() function on LPC2138 UART0 but it seems it doesn't work. It works fine on UART1 but not on UART0. Am I missing something? Must I use some redirect or something? Michal
Read-Only Author Dan Henry Posted 19-Jun-2006 15:38 GMT Toolset ARM	RE: printf doesn't work Dan Henry printf() outputs through putchar() which usually outputs to a single I/O device. Does your putchar() allow for multiple I/O devices? How do you switch between them?
Read-Only Author A.W. Neil Posted 19-Jun-2006 15:46 GMT Toolset ARM	RE: printf doesn't work A.W. Neil "printf() outputs through putchar()..." http://www.keil.com/support/man/docs/ca/ca_printf.htm "... which usually outputs to a single I/O device." You will need to consult your compiler Manuals (specifically, the Library section) to find out the specific requirements of the particular putchar() implementation. I wouldn't be surprised if GCC requires you to do some sort of "device open" for the UART; I have no idea for RealView - you'll have to read that one up for yourself!
Read-Only Author Michal Ogard Posted 19-Jun-2006 16:35 GMT Toolset ARM	RE: printf doesn't work Michal Ogard I did sweep over the manuals for my compiler (http://www.keil.com/support/man/docs/ca/ca_putchar.htm ) but I can't find any thing valuable in there. Because of that I put my problem on a forum. I know RTFM sometimes works but not in this case…
Read-Only Author Dan Henry Posted 19-Jun-2006 16:45 GMT Toolset ARM	RE: printf doesn't work Dan Henry http://www.keil.com/support/man/docs/ca/ca_putchar.htm As it suggests on that page, you'll have to modify the source to provide the functionality you require.
Read-Only Author Andy Neil Posted 19-Jun-2006 16:54 GMT Toolset ARM	So make it work! Andy Neil "but I can't find any thing valuable in there." Eh??? http://www.keil.com/support/man/docs/ca/ca_putchar.htm says: "Source code is provide in the LIB folder." See also http://www.keil.com/support/man/docs/ca/ca_lib_source.htm You have the complete source code, so you can see exactly what it's doing, and modify it to your requirements!
Read-Only Author Andy Neil Posted 19-Jun-2006 16:56 GMT Toolset ARM	RE: So make it work! Andy Neil http://www.keil.com/support/docs/2014.htm http://www.keil.com/download/docs/288.asp
Read-Only Author Michal Ogard Posted 19-Jun-2006 17:06 GMT Toolset ARM	RE: So make it work! Michal Ogard Andy! Thanks a lot. I made some mistake in reprogramming putchar :(. Thanks for help again! Michal

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