I just migrated a project from Keil 3 to Keil 5 (C51 = V9.56.0.0 & LX51 4.66.66.0
I get the following (new) warnings:
*** WARNING L48: IGNORED RECURSIVE CALL CALLED: _SMBUS_SET_PACKET_DATA/SMBUS CALLER: SMBUS *** WARNING L48: IGNORED RECURSIVE CALL CALLED: SMBUS CALLER: _SMBUS_SET_PACKET_DATA/SMBUS
puzzle is that while there is a routine called smbus_set_packet_data there is no routine called smbus. In fact the routine is reproduced below:
static void smbus_set_packet_data(uint8_t pos, uint8_t val,uint8_t info) { smbus_packet[pos] = val; smbus_packet_info[pos] = info; }
What does the above warning indicate?
What exactly did the linker ignore? (Any calling sequence not included in the final binary?
thanks for the clarifications.
there are no function pointers involved in this case.
No, it's not.
As already noted, there are very specific restrictions on the use of function pointers due to the nature of the underlying 8051 hardware architecture.
You have to be very careful indeed about using function pointers in C51. It requires quite a detailed understanding of the Linker operation. There's a couple of app notes that you really need to study thoroughly.
Do a forum search for "function pointer" ...
www.catb.org/.../smart-questions.html
it is a module ie source file. i believe it has to do with a "static array" access within this source file. (Multiple patterns).
i have resolved the issue but i would think it is a linker bug.
thanks anyhow.
C51 (due to the hardware of the '51) has REAL problems with recursive and/or function pointers.
It takes a seasoned developer or 2 bottles of aspirin to make that work
unfortunately it is common for those that want to 'think PC' to throw both in
The manuals say it's to do with function pointers:
http://www.keil.com/support/man/docs/bl51/bl51_l48.htm
http://www.keil.com/support/man/docs/lx51/lx51_l48.htm
So is "smbus" the name of a function pointer ... ?
Or a Module (source file), rather than a "routine" ... ?
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