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Relocate to RAM built-in run-time library functions

Pittet Sebastien
Expert 1050 points
Other Parts Discussed in Thread: CC2640

Hi everyone,

Following advices from the ULP advisor, i'm trying to put an entire function to work in RAM because i use float types. I think I succeed in this operation but i still have division and multiplication operations to do and i should move them to RAM. This tutorial ask me to relocate processor intensive functions to RAM with this code : 

.text:rts430.lib_div : { rts*.lib<div16u.obj>(.text) } .run_from_ram 
.text:rts430.lib_mult : { rts*.lib<mult16_f5hw.obj>(.text) } .run_from_ram 
.text:rts430.lib_printf : { rts*.lib<*printf.obj>(.text) } .run_from_ram

But using a CC2640 and runtime library set to "automatic", i do not know how to find theses functions (I can't open library file even with notepad). I tried this way :

.text:rtsv7M3_T_le_eabi.lib_div : { rts*.lib<div16u.obj>(.text) } 	.run_from_ram
.text:rtsv7M3_T_le_eabi.lib_mult: { rts*.lib<mult16_f5hw.obj>(.text) } 	.run_from_ram

Two warnings indicates that "No matching sections" ( #10068)

Thanks in advance

Have a nice day

  • 0
    TI__Mastermind 29650 points
    Pittet,

    The run time libraries are picked by the compiler based on what functionality is needed. You might be able to get some help from the TI ARM compiler user guide:
    www.ti.com/.../spnu151j.pdf

    Note that in many cases performance will deteriorate by doing this since the CC26XX series will cache flash accesses to a single-cycle cache RAM which is faster than executing from regular SRAM.

    Regards,
    Svend