Hi,I am using msp430f248 and trying to implement printf() function on my
embedded system. I have my own functions that can successfully send or receive
data from UART0. But i can not use printf() function so I have done a few things
which i searched from the forum of TI, e2e community, and those things are
below. By the way, i am using CCE 3.1.
1. Extract the .zip file “/tools/compiler/MSP430/lib/rtssrc.zip”
into a folder on your harddrive.2. Add the files fputc.c and fputs.c in the
extracted /SHARED/ directory to your CCE project. fputc( ) is called for the
characters in the printf( ) function . fputs( ) is called for the '%x'
strings in the printf function.3. Edit the fputc and fputs functions to fit your
needs (e.g.- poll TXIFG and load transmit buffer). Your printf function is now
ported.4. Check the project settings so that the linker will not return any
errors. The CCE v3 version will return "symbol redefined" errors when custom
runtime source files are added to the project. To get around these errors, do
the following: Project Properties->C/C++ Build->MSP430 Linker: Change the
Command line pattern to be: ${command} ${inputs} ${flags}
${output_flag}${output} Placing ${inputs} before ${flags} puts the object files
before the runtime library on the link command line, thus resolving the
reference to the definition in the object file. Now rebuilding the project
should no longer generate the symbol redefined errors.5. Increase the heap size
to ~500 bytes under the menu option: Project--> Properties--> C/C++ Build
-->Tool Settings-->Runtime environment. Printf is a huge function and requires
quite a lot of heap space.
After doing those above, i have a semi successfull printf() function working. It
is not absolutely successfully working because it can not format the thing i
want to write. For example; i am trying to write both a character and a
formatted integer but it can not format the integer. The code is as below;int
y=50;printf("a%d\r\n",y);--------- and that writes only "a" on the console but
not the formatted integer. What should i do to solve this in addition to the
things mentioned above?
Printf() function problem
Started by ●July 16, 2009
