hello guys,
while coding (embedded devices) i got an idea.
void uart_send_param(uint8_t before, uint8_t after, uint8_t default_value)
{
uint8_t i = 0;
uart_send(ASCII_ESCAPE);
uart_send(before);
while(before < vt100_param_getcount())
{
if(vt100_param_get(i) != default_value)
{
uart_send_int(vt100_param_get(i));
}
if(++i < vt100_param_getcount())
uart_send(VT100_PARAM_DELIMITER);
}
uart_send(after);
}
in the above code, after sending uart_send(before) , "before" is no more
useful to me.
but for while loop i have to get a new variable "i" for iteration.
in this case the compiler allocates the memory in stack.
since in embedded system, everything is scare , reusing things come handy
and efficient.
but if i try to reuse "before" in loop as replacement of "i" , it looks odd
+ bad coding practise, right?
but if their is something like __reuse__("before", "i") ( like
__attribute__() or sizeof() ) or uart_send_param(uint8_t before|i, uint8_t
after, uint8_t default_value)
after that i could use "before" as "i".
if "i" is just finished up with register indexing and no stack allocation,
then that good but still the problem of reuse might arise in some other
case.
in some case union can be used but i think it cannot solve the above
problem.
it can help alot to reduce push and pop operations, making thing efficient.
more or like saving 4 bytes flash and 2(or 1 byte, i dont know :) ) byte of
stack.( msp are 16bit MCU's, msp430G2552 only have 8K flash and 256Byte Ram
, so that comparable).
and when the flash get full or ram overflows it really hurts :)
note: rejected by mail demon of g...@gcc.gnu.org so im trying here.
--
*Kuldeep Singh Dhaka*
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