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how to simulate special registers in ARM Core

Pepoja over 10 years ago

Hi all,

I have a problem.

I can simulate my application (C and Keil uVision5). Target: LPC824
But, simulator stopped at one line: wait for PLL Locked.

After change PLL control register (SYSPLLCTRL), application must wait while bit LOCK in SYSPLLSTAT register is zero. In realtime debugging in target working fine, but in simulator don't work - SYSPLLSTAT don't changed.

Please, How to simulate changes in SYSPLLSTAT register (this is read-only register)?

LPC82x User's manual: www.nxp.com/.../UM10800.pdf - see 5.6.4 on page 35

Thank you.

peter

Parents

0 Pepoja over 10 years ago in reply to Keith Lamberhurst

Hmm,

I cannot change source code due to simulation... :-)

Ok, after very quick study I found solution.

- Create file simulation.ini with this content:

FUNC void Setup (void) {
_WDWORD(0x4004800C, 0x00000000);                        // PLL not Locked - default value
SP = _RDWORD(0x00000000);
PC = _RDWORD(0x00000004);
}

LOAD %L INCREMENTAL                                     // Download

Map 0x4004800C , 0x4004800f READ WRITE;                 // map this location (reg SYSPLLSTAT) as R/W
define button "Toggle PLL Lock bit",  "_WDWORD(0x4004800C, 0x00000001 & (!_RDWORD(0x4004800C)))" ;          // click will toglle value of SYSPLLSTAT

Setup();                                   // Setup for Running
g, main

- select this file in dialog "Options for Target '...'" -> Debug Tab -> initialization file for simulator
- now start debug (Simulation)
- Go MENU->VIEW->TOOLBOX WINDOWS, and now You can see toolbox with new button. Try to press it...

This is only quick solution for today (maybe not ideal, but sufficient for me).... :-)

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