Debugging code from RAM

[sivakumar]

Posted on December 02, 2014 at 15:33

Hi,

I am developing an application for STM32F427 that runs from RAM using Keil. The bootloader application moves the code to ram and starts the execution, so execution is not an issue. But I am not able to load/debug the code using Keil. When I try to load it, it throws the error message ''No algorithm found for address <start address>-<end address>. I read this manual http://www.keil.com/support/man/docs/ulinkpro/ulinkpro_su_newalgorithms.htm and now the error message is gone but, the operation freezes and timesout during erase. Has anyone tried it before? Here is the code I wrote for the programming algorithm.

/***********************************************************************/
/* This file is part of the ARM Toolchain package */
/* Copyright (c) 2010 Keil - An ARM Company. All rights reserved. */
/***********************************************************************/
/* */
/* FlashDev.C: Flash Programming Functions adapted */
/* for New Device 256kB Flash */
/* */
/***********************************************************************/
#include ''..\FlashOS.H'' // FlashOS Structures
/* 
Mandatory Flash Programming Functions (Called by FlashOS):
int Init (unsigned long adr, // Initialize Flash
unsigned long clk,
unsigned long fnc);
int UnInit (unsigned long fnc); // De-initialize Flash
int EraseSector (unsigned long adr); // Erase Sector Function
int ProgramPage (unsigned long adr, // Program Page Function
unsigned long sz,
unsigned char *buf);
Optional Flash Programming Functions (Called by FlashOS):
int BlankCheck (unsigned long adr, // Blank Check
unsigned long sz,
unsigned char pat);
int EraseChip (void); // Erase complete Device
unsigned long Verify (unsigned long adr, // Verify Function
unsigned long sz,
unsigned char *buf);
- BlanckCheck is necessary if Flash space is not mapped into CPU memory space
- Verify is necessary if Flash space is not mapped into CPU memory space
- if EraseChip is not provided than EraseSector for all sectors is called
*/
/*
* Initialize Flash Programming Functions
* Parameter: adr: Device Base Address
* clk: Clock Frequency (Hz)
* fnc: Function Code (1 - Erase, 2 - Program, 3 - Verify)
* Return Value: 0 - OK, 1 - Failed
*/
typedef
volatile
unsigned 
char
vu8;
typedef
unsigned 
char
u8;
typedef
volatile
unsigned 
short
vu16;
typedef
unsigned 
short
u16;
typedef
volatile
unsigned 
long
vu32;
typedef
unsigned 
long
u32;
#define M8(adr) (*((vu8 *) (adr)))
#define M16(adr) (*((vu16 *) (adr)))
#define M32(adr) (*((vu32 *) (adr)))
int
Init (unsigned 
long
adr, unsigned 
long
clk, unsigned 
long
fnc) {
/* Add your Code */
return
(0); 
// Finished without Errors
}
/*
* De-Initialize Flash Programming Functions
* Parameter: fnc: Function Code (1 - Erase, 2 - Program, 3 - Verify)
* Return Value: 0 - OK, 1 - Failed
*/
int
UnInit (unsigned 
long
fnc) {
/* Add your Code */
return
(0); 
// Finished without Errors
}
/*
* Erase complete Flash Memory
* Return Value: 0 - OK, 1 - Failed
*/
int
EraseChip (
void
) {
int
i;
unsigned 
int
*ptr = (unsigned 
int
*)0x20000000;
for
(i = 0;i<0x30000/4;i++)
{
*ptr = 0;
ptr++;
}
return
(0); 
// Finished without Errors
}
/*
* Erase Sector in Flash Memory
* Parameter: adr: Sector Address
* Return Value: 0 - OK, 1 - Failed
*/
int
EraseSector (unsigned 
long
adr) {
unsigned 
int
i;
unsigned 
int
cur_sector = adr/1024;
unsigned 
int
* sector_addr = (unsigned 
int
*)(cur_sector*1024);
for
(i = 0;i<256;i++)
{
*sector_addr = 0;
sector_addr++;
}
return
(0); 
// Finished without Errors
}
/*
* Program Page in Flash Memory
* Parameter: adr: Page Start Address
* sz: Page Size
* buf: Page Data
* Return Value: 0 - OK, 1 - Failed
*/
int
ProgramPage (unsigned 
long
adr, unsigned 
long
sz, unsigned 
char
*buf) {
sz = (sz + 3) & ~3; 
// Adjust size for Words
while
(sz) {
M32(adr) = *((u32 *)buf); 
// Program Double Word
if
(M32(adr) != *((u32 *)buf))
{
return
1;
}
adr += 4; 
// Go to next Word
buf += 4;
sz -= 4;
}
return
(0); 
// Finished without Errors
}

#keil #stm32f427-ulink2-jtag

[Tesla DeLorean]

Posted on December 02, 2014 at 15:45

You don't need to use the flash method, you tell the system not to download the code, and instead use a debugger script (.INI) which basically does a ''LOAD %L'' on your file, and then executes the code. Look at some of the Keil documentation, and example .INI files in the Boards/Examples directories.