Hi guys....once again.
To introduce again, I am using gcc (arm-elf-gcc V 4.1.1 ) as cross compiler for LPC2368 processor on Ubuntu and ....I am a newbee.
Initially I had problems with with compiling and linking which are solved now. I am able to make the hex file also.But the hex file is not working on the processor.
Here are the modified startup files , the source file and the linker script.
/********************** crt0.S ************************************/
.global _etext
.global _data .global _edata .global __bss_start .global __bss_end__ .global _stack
.set UND_STACK_SIZE, 0x00000004 .set ABT_STACK_SIZE, 0x00000004 .set FIQ_STACK_SIZE, 0x00000004 .set IRQ_STACK_SIZE, 0X00000080 .set SVC_STACK_SIZE, 0x00000004
.set MODE_USR, 0x10 .set MODE_FIQ, 0x11 .set MODE_IRQ, 0x12 .set MODE_SVC, 0x13 .set MODE_ABT, 0x17 .set MODE_UND, 0x1B .set MODE_SYS, 0x1F
.equ I_BIT, 0x80
.equ F_BIT, 0x40
.text .arm .section .init, "ax"
.code 32 .align 2
.global _boot .func _boot _boot:
Vectors: b _start ldr pc,_undf ldr pc,_swi ldr pc,_pabt ldr pc,_dabt nop ldr pc,[pc,#-0xFF0] ldr pc,_fiq
#if 0
_undf: .word _reset _swi: .word _reset _pabt: .word _reset _dabt: .word _reset _irq: .word _reset _fiq: .word _reset
#else
_undf: .word __undf _swi: .word __swi _pabt: .word __pabt _dabt: .word __dabt _irq: .word __irq _fiq: .word __fiq
__undf: b . __swi: b . __pabt: b . __dabt: b . __irq: b . __fiq: b . #endif .size _boot, . - _boot .endfunc
.global _start, start, _mainCRTStartup .func _start
_start: start: _mainCRTStartup:
ldr r0,=_stack msr CPSR_c,#MODE_UND|I_BIT|F_BIT
mov sp,r0 sub r0,r0,#UND_STACK_SIZE msr CPSR_c,#MODE_ABT|I_BIT|F_BIT mov sp,r0 sub r0,r0,#ABT_STACK_SIZE msr CPSR_c,#MODE_FIQ|I_BIT|F_BIT mov sp,r0 sub r0,r0,#FIQ_STACK_SIZE msr CPSR_c,#MODE_IRQ|I_BIT|F_BIT mov sp,r0 sub r0,r0,#IRQ_STACK_SIZE msr CPSR_c,#MODE_SVC|I_BIT|F_BIT mov sp,r0 sub r0,r0,#SVC_STACK_SIZE msr CPSR_c,#MODE_SYS|I_BIT|F_BIT mov sp,r0
#ifdef ROM_RUN ldr r1,=_etext ldr r2,=_data ldr r3,=_edata
1: cmp r2,r3 ldrlo r0,[r1],#4 strlo r0,[r2],#4 blo 1b #endif
mov r0,#0 ldr r1,=__bss_start ldr r2,=__bss_end__
2: cmp r1,r2 strlo r0,[r1],#4 blo 2b
mov r0,#0
mov r1,r0
mov r2,r0
mov fp,r0
mov r7,r0
ldr r10,=main
mov lr,pc
bx r10
.size _start, . - _start .endfunc
.global _reset, reset, exit, abort .func _reset _reset: reset: exit: abort: #if 0
mrs r0,cpsr orr r0,r0,#I_BIT|F_BIT msr cpsr,r0
ldr r1,=(PS_BASE) ldr r0,=(PS_PIO) str r0,[r1,#PS_PCER_OFF] ldr r1,=(PIO_BASE) ldr r0,=(1 RAM
. = ALIGN(4);
_edata = . ;
PROVIDE (edata = .);
/* .bss section which is used for uninitialized data */
.bss (NOLOAD) :
{
__bss_start = . ;
__bss_start__ = . ;
*(.bss)
*(.gnu.linkonce.b*)
*(COMMON)
. = ALIGN(4);
} > RAM
. = ALIGN(4);
__bss_end__ = . ;
PROVIDE (__bss_end = .);
.stack :
{
*(.stack) *(.STACK) . = ALIGN(256); /* . += STACK_SIZE;*/
PROVIDE (_stack = .); . = ALIGN(4);
} > RAM
_end = . ;
PROVIDE (end = .);
}
/************************ ROM.ld ends*********************/
/********************* new.c ***********************/
#include "LPC23xx.h"
int main() { PLLFEED = 0xAA; PLLFEED = 0x55; PLLCFG = 0x40032; PLLFEED = 0xAA; PLLFEED = 0x55; PLLCON = 0X03; PLLFEED = 0xAA; PLLFEED = 0x55; while(!(PLLSTAT & 0x04000000)) {}
CCLKCFG = 0x05;
while(1) { IODIR0 = 0xFFFFFF; IOCLR0 = 0xFFFFFF; }
}
/****************************** new.c ends *************************/
And the commands used are :
arm-elf-gcc -c new.c -o new.o arm-elf-gcc -c crt0.S -o crt0.o arm-elf-gcc -mcpu=arm7tdmi-s -nostdlib -nostartfiles crt0.o ROM.ld new.o -o y.elf arm-elf-objcopy -O ihex y.elf zzz.hex
I am definitely missing something , but unable to figure it out.
All the geniuses out there...please help me out.
Thanks a million. Nik