hello all, i have one arm7 kit of lpc2148. and one IDE is provided with it, its name is SCARM, i have written one simple program of led on-off in SCARM and downloaded it and it is working fine. When i wrote the same program in keil, and i included its header file and startup file. compilation is successful.but when i downloaded the file in same board it is not responding. i want to solve this problem. is it because of startup file or something else? and i want to use keil as SCARM code size is restricted to only 2Kbyte. pls help me thank you
hello again, thanks for reply. yes the site is same. here is startup file for LPC2148 in keil:
and another startup.asm for SCARM
/* startup.asm Revison 1.1, dated 9 August 2005. */ .section .text .code 32 @.globl vectors vectors: b reset @ Reset b . @ Undefined instruction b . @ SWI b . @ Prefetch abort b . @ Data abort b . @ reserved vector @ The following instruction should transfer control to @ the vector corresponding to ISR of IRQ @ Most ARM micro-controllers include a built-in @ Interrupt Controller. One example is the LPC2138. @ It includes the VIC interrupt controller. @ It will automatically put appropriate jump address @ into the register "VICVectAddr" - provided the VIC @ is configured appropriately by the user. @ So the following instruction simply copies the contents @ of "VICVectAddr" into PC. @ This instruction is appropriate, if you are using @ LPC2138 micro-controller (or it's cousins) @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ NOTE: You may need to change the following instruction @ to make it work correctly for other ARM micro-controllers. @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ldr pc,[pc,#-0xFF0] @ irqs (to VICVectAddr) b . @ fast irqs reset: @ clear .bss section ldr r1, bss_start ldr r2, bss_end ldr r3, =0 clear_bss: cmp r1,r2 strne r3,[r1],#+4 bne clear_bss do_init: ldr r1,initdata_start @ start address of init table ldr r2,initdata_end @ end address of init table do1init:cmp r1,r2 bhs init_done ldr r0,[r1],#4 @ destination address ldr r3,[r1],#4 @ number of bytes to copy copy_loop: ldrb r4,[r1],#1 @ read 1 byte from source strb r4,[r0],#1 @ write 1 byte to destination subs r3,r3,#1 bne copy_loop @ now align the address in R1 to 4 bytes boundry add r1,r1,#3 and r1,r1,#~3 b do1init init_done: @ init sp for supervisor (default) mode ldr r13,stack_pointer @ init sp for IRQ mode mrs r0,cpsr bic r1,r0,#0x1F orr r1,r1,#0x012 @ IRQ mode= 0x12 msr cpsr_c,r1 ldr r13,irq_stack @ enable IRQs & return to supervisor mode bic r0,r0,#0x80 @ cpsr[7]=IRQ disable flag msr cpsr_c,r0 @ run C program bl main here: b here stack_pointer: .word _stack_top irq_stack: .word _irq_stack_top bss_start: .word __bss_start__ bss_end: .word __bss_end__ initdata_start: .word __initdata_start__ initdata_end: .word __initdata_end__ .end
pls help. and my c code is:
#include <stdio.h> #include "LPC2148.h" #include "mainhdr.h" int main(void) { // init_pll(); // init_mam(); // init_vpb(); init_port(); while(1) { IO0SET = 0xffffffff; // delay(5000); // IO0CLR = 0xffffffff; // delay(5000); } } /* void init_pll(void) { //system clock //PLLCFG = 0x00100100; //p=2 (PSEL=01) and m=5-1 (MSEL=00100) PLL0CFG = 0x22; //48Mhz m = 4-1 = 3 i.e 00010 // PLLCFG = 0x23; //60Mhz m=5-1=4 i.e 00011 PLL0CON = 0x01; PLL0FEED = 0xaa; PLL0FEED = 0x55; while((PLL0STAT & 0x400) == 0); PLL0CON = 0x03; PLL0FEED = 0xaa; PLL0FEED = 0x55; //usb clock //PLL48CFG = 0x00100011; //p=2 (PSEL=01) and m=4-1 (MSEL=00011) PLL1CFG = 0x23; PLL1CON = 0x01; PLL1FEED = 0xaa; PLL1FEED = 0x55; while((PLL1STAT & 0x400) == 0); PLL1CON = 0x03; PLL1FEED = 0xaa; PLL1FEED = 0x55; } */ void init_mam(void) { MAMTIM = 0x00000001; MAMCR = 0x02; } void init_vpb(void) { VPBDIV = 0x01; } void init_port(void) { SCS = 0x00000000; PINSEL0 = 0x00000000; //all gpio IO0DIR = 0xffffffff; //p0.15 as output IO0CLR = 0xffffffff; //p0.15 = 1 } void delay(uint a) { uint i,j; for(i=0;i<a;i++) { j = 0; } }
hello again, and arm startupt file is already present in keil4 folder which we get after installation thank you
hello andrew neil are you there?
hello all, pls help me in startup file thank you
Why do you insist that it's the startup file?
Have you actually read anyhing that I've said to you so far? Have you read the articles that I linked?
Have you spent any time debugging your code?
Keil provide plenty of "blinky" examples - have you looked at any of those?
hello sir, thanx for your reply. and problem was in startup file only. and i am using board of other company and developing code on keil. so i disabled the PLL,MAM,VPBDIV functions in startup file. i added target.c file to my project and now simple program of led blinking is working. thanks for your help and i saw the links mentioned by you. but my problem was not related to these links. thanks for your help and support. regards
How do you know that?
What, exactly, was the problem?
Maybe not this time - but do you now understand the issues?
Do you now understand how compiler optimisation could break such code? (in fact, compiler optimisation is likely to break such code!)
Do you now understand how to write code that will not be broken by compiler optimisation?