|
I have written very simple code just to evaluate the LPC2129 speed for the Keil MCB2100 board: void Meander(void) { unsigned int n; n = 0x00010000; while (1) { IOSET1 = n; IOCLR1 = n; } } It works well and I can scope the meander pulses. But when I add the __ram attribute: void Meander(void) __ram The program does not work. Should I make any other changes in the program or compiler settings to force the code work from RAM? Thanks, Varuzhan |
|
|
__ram attribute in Keil CA compiler
Started by ●December 9, 2004
Reply by ●December 10, 20042004-12-10
|
Ok, I write ERAM(0x40003F00-0x40003FFF) in the mentioned place and it works. But two more questions 1. Isn't it possible to force the system to automatically allocate necessary space for ERAM segment? 2. Very strange, but the code (see below) runs from the RAM with the same speed as from Flash. What mistake I do? Thank you in advanca, Varuzhan --- In , "beano040461" <paulbearne@b...> wrote: > > --- In , "varuzhandanielyan" <dan@x> wrote: > > > > I have written very simple code just to evaluate the LPC2129 > > speed for the Keil MCB2100 board: > > > > void Meander(void) > > { > > unsigned int n; > > > > n = 0x00010000; > > while (1) { > > IOSET1 = n; > > IOCLR1 = n; > > } > > } > > > > It works well and I can scope the meander pulses. But when I add > > the __ram attribute: > > > > void Meander(void) __ram > > > > The program does not work. Should I make any other changes in the > > program or compiler settings to force the code work from RAM? > > > > Thanks, > > Varuzhan > > You need at the location of ram you wish to use to run the code > In the la locate user classes section of the target options use the > ERAM directive > i.e > ERAM(0x0400-0x4FF) > making sure that you allocate enough space for the function > paul |
