/**
* armboot - Startup Code for ARM7 CPU-core
*/

/* Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs */
.equ MODE_USR, 0x10
.equ MODE_FIQ, 0x11
.equ MODE_IRQ, 0x12
.equ MODE_SVC, 0x13
.equ MODE_ABT, 0x17
.equ MODE_UND, 0x1B
.equ MODE_SYS, 0x1F

.equ I_BIT, 0x80 /* when I bit is set, IRQ is disabled */
.equ F_BIT, 0x40 /* when F bit is set, FIQ is disabled */

/* Stack Configuration */
.equ TOP_STACK, 0x40004000
.equ UND_STACK_SIZE, 0x00000004
.equ SVC_STACK_SIZE, 0x00000004
.equ ABT_STACK_SIZE, 0x00000004
.equ FIQ_STACK_SIZE, 0x00000004
.equ IRQ_STACK_SIZE, 0x00000080

.text

.global __start
.global __reset
.global __initstack

__start:
/*
* Vector table
*/
b __reset /* Reset interrupt */
b . /* Undefined Instruction */
b . /* Software Interrupt */
b . /* Prefetch Abort Interrupt */
b . /* Data Abort Interrupt */
b . /* Reserved */
ldr pc, [PC, #-0xFF0] /* IRQ Interrupt */
b . /* FRQ Interrupt */

/* The copyright notice embedded at the begining of the ROM */
.string "Copyright (c) YYTEK. All Rights Reserved."
.align 4 /* re-align to the word boundary */

__reset:
bl __initstack /* Initial stack */

load_data: /* load .data section to ram */
ldr r1, = __text_end
ldr r2, = __data_start
ldr r3, = __data_end
load_data1:
cmp r2, r3;
ldrlo r0, [r1], #4
strlo r0, [r2], #4
blo load_data1

clear_bss:
ldr r0, =__bss_start /* find start of bss segment */
ldr r1, =__bss_end /* stop here */
mov r2, #0x00000000 /* clear */

clbss_l:str r2, [r0] /* clear loop... */
add r0, r0, #4
cmp r0, r1
ble clbss_l

bl lowlevel_init
b main

/*
* Stack Configuration.
*
* Enabling interrupts in the CPSR and keeping the part in
* Supervison mode after ARM core reset.
*/
__initstack:
mov r0, lr

ldr r1, =TOP_STACK
msr cpsr_c, #MODE_UND | I_BIT | F_BIT
mov sp, r1

sub r1, r1, #UND_STACK_SIZE
msr cpsr_c, #MODE_ABT | I_BIT | F_BIT
mov sp, r1

sub r1, r1, #ABT_STACK_SIZE
msr cpsr_c, #MODE_FIQ | I_BIT | F_BIT
mov sp, r1

sub r1, r1, #FIQ_STACK_SIZE
msr cpsr_c, #MODE_IRQ | I_BIT | F_BIT
mov sp, r1

sub r1, r1, #IRQ_STACK_SIZE
msr cpsr_c, #MODE_SVC | I_BIT | F_BIT
mov sp, r1

sub r1, r1, #SVC_STACK_SIZE
msr cpsr_c, #MODE_SYS | F_BIT
mov sp, r1

mov pc, r0

An Engineer's Guide to the LPC2100 Series

Hi sir,

I append this sentence, and when enter main, CPSR I bit =0.
When I send data to UART via PC, it still not enter UART_ISR ,always
enter __program_start and never jump to main.

It's very strange. I have no idea.
BTW, below is my PLL config code:
============================#define PLL_MValue 3 // actually M=4
#define PLL_PValue 1 // actually P=2

PLLCFG = PLL_MValue | (PLL_PValue << 5);
PLLCON = 1; // Disable PLL, disconnected
PLLFEED = 0xAA;
PLLFEED = 0x55;

while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status

MValue = PLLSTAT & 0x0000001F;
PValue = (PLLSTAT & 0x00000060) >> 5;
while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );

PLLCON = 0x03; // Enable PLL, disconnected
PLLFEED = 0xAA;
PLLFEED = 0x55;
============================
I found PLL CONNECT bit not always = 1, in debug mode, when debug paused,
this bit sometime =0 , sometime =1.
If my PLL configuration has some issue?

Thanks a lot.

Best Regards,
Vincent

--------------
From: "kaoru"
Sent: Thursday, April 29, 2010 12:10 PM
To:
Cc: "Vincent"
Subject: Re: [lpc2000] Lpc2103 could not enter UART0 IRQ

> after:
> orr r0,r0,#SYS_MODE ; Set System mode bits
>
> append:
> bic r0,r0,#0x80 ; Enable IRQ interrupt
>
> In 2010-4-29 10:55, Vincent Wrote:
>> Hello sir,
>>
>> Thank you . I found that CPSR bit[7](I bit) = 1 after entered main . So
>> all IRQ disabled.
>> In startup.s79 file , it will setup CPSR.
>> But file I used is copy from IAR. Since I have no experience in compile
>> language.
>> Please help me how to set CPSR value in startup.s.
>>
>> --------------
>> From: "yytek" >
>> Sent: Wednesday, April 28, 2010 10:26 PM
>> To: >
>> Cc: "hjiongh" >
>> Subject: Re: [lpc2000] Lpc2103 could not enter UART0 IRQ
>>
>> > Hello, do you receive one interrupt on send char to PC?
>> >
>> > If you can't receive on interrupt, maybe CPSR register of MCU running
>> on
>> > this mode don't enable IRQ interrupt.
>> >
>> > 于 2010-4-28 17:47, hjiongh 写道:
>> >>
>> >>
>> >> Hi,
>> >> I'm using LPC2103, IAR4.42A. Now I use IAR setup file
>> >> lpc2xxx_cstartup.s79 and setup a new project.
>> >> In main funciton , I setup PLL and UART0 as below:
>> >> ================================>> >> void SysControl_Init(void)
>> >> {
>> >> #ifdef xFLASH
>> >> MEMMAP=3;
>> >> #elif xSDRAM
>> >> MEMMAP = 2; // xSDRAM should be defined in PRO_Sys_Macro.h , modify
>> in
>> >> the future
>> >> #elif iRAM
>> >> MEMMAP = 2;
>> >> #else
>> >> MEMMAP=1;
>> >> #endif
>> >>
>> >> APBDIV = 1; // APB bus clock is the same as the processor clock
>> >>
>> >> SysControl_Enable_PLL();
>> >>
>> >>
>> >> //SCS = 1;
>> >>
>> >> MAMCR = 2; // Per NXP advisory 7/11/05 for correct operation from //
>> >> flash in stand alone mode
>> >> MAMTIM = 4;
>> >>
>> >> SysControl_VIC_Init();
>> >>
>> >> }
>> >>
>> >> void SysControl_Enable_PLL(void)
>> >> {
>> >> INT8U MValue, PValue;
>> >>
>> >> //PLLCON = 0; // Disable PLL, disconnected
>> >> //PLLFEED = 0xAA;
>> >> //PLLFEED = 0x55;
>> >>
>> >>
>> >> PLLCFG = PLL_MValue | (PLL_PValue << 5);
>> >> PLLCON = 1; // Disable PLL, disconnected
>> >> PLLFEED = 0xAA;
>> >> PLLFEED = 0x55;
>> >>
>> >> while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status
>> >>
>> >> MValue = PLLSTAT & 0x0000001F;
>> >> PValue = (PLLSTAT & 0x00000060) >> 5;
>> >> while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );
>> >>
>> >> PLLCON = 0x03; // Enable PLL, disconnected
>> >> PLLFEED = 0xAA;
>> >> PLLFEED = 0x55;
>> >>
>> >> //while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check connect bit status
>> >> }
>> >>
>> >> void SysControl_VIC_Init(void)
>> >> {
>> >> INT32U i;
>> >> INT32U *ptr2VectCtrlBase = (unsigned int *)0xFFFFF200;
>> >> INT32U *ptr2VectAddrBase = (unsigned int *)0xFFFFF100;
>> >>
>> >> for(i=0; i<16; i++)
>> >> {
>> >> *ptr2VectCtrlBase++ = 0; // Disable all vectored IRQ slots
>> >> *ptr2VectAddrBase++ = 0; // Clear address of the Interrupt Service
>> >> routine (ISR) for vectored IRQs
>> >> }
>> >>
>> >> VICIntSelect = 0; // Set all VIC interrupts to IRQ for now
>> >> VICIntEnClr = 0xFFFFFFFF; // Diasable all interrupts
>> >> //VICProtection = 0; // VIC registers can be accessed in User or
>> >> privileged mode
>> >> VICVectAddr = 0; // Clear interrupt
>> >> }
>> >>
>> >> PINSEL0 &= 0xfffffff0;
>> >> PINSEL0 |= 0x00000005;
>> >>
>> >> U0LCR = 0x83;
>> >> Fdiv = (Fpclk/16)/UART_BPS;
>> >> U0DLM = Fdiv/256;
>> >> U0DLL = Fdiv %256;
>> >> U0LCR = 0x03;
>> >>
>> >> U0FCR = 0x01; //the interrupt will occurs when received one byte
>> data.
>> >> U0IER = 0x01;
>> >>
>> >> VICVectCntl0=0x26;
>> >> VICVectAddr0 = (INT32U)&UART0_ISR;
>> >> VICIntEnable |= 0x00000040;
>> >> ================================>> >>
>> >> I only could send string via UART0 successfully , but could not enter
>> >> UART0 ISR while receive data via UART0.
>> >>
>> >> It doubted me that since send string via UART0 is ok, why receive
>> >> failed. I only use UART as RS232. Also when receive data via UART
>> while
>> >> debugging, I paused debug and saw U0RBR has data which i send through
>> >> PC. It's very strange.
>> >>
>> >> Hope anyone can help me or supply me LPC2103 demo project base on
>> >> IAR4.42A.(IAR4.42A setting demo project has no UART :( ,so i hope can
>> >> supply me project with UART part)
>> >>
>> >> Thanks very much! Hope your response!
>> >>
>> >> Best Regards,
>> >> Vincent
>> >>
>> >>
>> >
>>
>

after:
orr r0,r0,#SYS_MODE ; Set System mode bits

append:
bic r0,r0,#0x80 ; Enable IRQ interrupt

In 2010-4-29 10:55, Vincent Wrote:
> Hello sir,
>
> Thank you . I found that CPSR bit[7](I bit) = 1 after entered main . So
> all IRQ disabled.
> In startup.s79 file , it will setup CPSR.
> But file I used is copy from IAR. Since I have no experience in compile
> language.
> Please help me how to set CPSR value in startup.s.
>
> --------------
> From: "yytek" >
> Sent: Wednesday, April 28, 2010 10:26 PM
> To: >
> Cc: "hjiongh" >
> Subject: Re: [lpc2000] Lpc2103 could not enter UART0 IRQ
>
> > Hello, do you receive one interrupt on send char to PC?
> >
> > If you can't receive on interrupt, maybe CPSR register of MCU running on
> > this mode don't enable IRQ interrupt.
> >
> > 于 2010-4-28 17:47, hjiongh 写道:
> >>
> >>
> >> Hi,
> >> I'm using LPC2103, IAR4.42A. Now I use IAR setup file
> >> lpc2xxx_cstartup.s79 and setup a new project.
> >> In main funciton , I setup PLL and UART0 as below:
> >> ================================> >> void SysControl_Init(void)
> >> {
> >> #ifdef xFLASH
> >> MEMMAP=3;
> >> #elif xSDRAM
> >> MEMMAP = 2; // xSDRAM should be defined in PRO_Sys_Macro.h , modify in
> >> the future
> >> #elif iRAM
> >> MEMMAP = 2;
> >> #else
> >> MEMMAP=1;
> >> #endif
> >>
> >> APBDIV = 1; // APB bus clock is the same as the processor clock
> >>
> >> SysControl_Enable_PLL();
> >>
> >>
> >> //SCS = 1;
> >>
> >> MAMCR = 2; // Per NXP advisory 7/11/05 for correct operation from //
> >> flash in stand alone mode
> >> MAMTIM = 4;
> >>
> >> SysControl_VIC_Init();
> >>
> >> }
> >>
> >> void SysControl_Enable_PLL(void)
> >> {
> >> INT8U MValue, PValue;
> >>
> >> //PLLCON = 0; // Disable PLL, disconnected
> >> //PLLFEED = 0xAA;
> >> //PLLFEED = 0x55;
> >>
> >>
> >> PLLCFG = PLL_MValue | (PLL_PValue << 5);
> >> PLLCON = 1; // Disable PLL, disconnected
> >> PLLFEED = 0xAA;
> >> PLLFEED = 0x55;
> >>
> >> while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status
> >>
> >> MValue = PLLSTAT & 0x0000001F;
> >> PValue = (PLLSTAT & 0x00000060) >> 5;
> >> while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );
> >>
> >> PLLCON = 0x03; // Enable PLL, disconnected
> >> PLLFEED = 0xAA;
> >> PLLFEED = 0x55;
> >>
> >> //while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check connect bit status
> >> }
> >>
> >> void SysControl_VIC_Init(void)
> >> {
> >> INT32U i;
> >> INT32U *ptr2VectCtrlBase = (unsigned int *)0xFFFFF200;
> >> INT32U *ptr2VectAddrBase = (unsigned int *)0xFFFFF100;
> >>
> >> for(i=0; i<16; i++)
> >> {
> >> *ptr2VectCtrlBase++ = 0; // Disable all vectored IRQ slots
> >> *ptr2VectAddrBase++ = 0; // Clear address of the Interrupt Service
> >> routine (ISR) for vectored IRQs
> >> }
> >>
> >> VICIntSelect = 0; // Set all VIC interrupts to IRQ for now
> >> VICIntEnClr = 0xFFFFFFFF; // Diasable all interrupts
> >> //VICProtection = 0; // VIC registers can be accessed in User or
> >> privileged mode
> >> VICVectAddr = 0; // Clear interrupt
> >> }
> >>
> >> PINSEL0 &= 0xfffffff0;
> >> PINSEL0 |= 0x00000005;
> >>
> >> U0LCR = 0x83;
> >> Fdiv = (Fpclk/16)/UART_BPS;
> >> U0DLM = Fdiv/256;
> >> U0DLL = Fdiv %256;
> >> U0LCR = 0x03;
> >>
> >> U0FCR = 0x01; //the interrupt will occurs when received one byte data.
> >> U0IER = 0x01;
> >>
> >> VICVectCntl0=0x26;
> >> VICVectAddr0 = (INT32U)&UART0_ISR;
> >> VICIntEnable |= 0x00000040;
> >> ================================> >>
> >> I only could send string via UART0 successfully , but could not enter
> >> UART0 ISR while receive data via UART0.
> >>
> >> It doubted me that since send string via UART0 is ok, why receive
> >> failed. I only use UART as RS232. Also when receive data via UART while
> >> debugging, I paused debug and saw U0RBR has data which i send through
> >> PC. It's very strange.
> >>
> >> Hope anyone can help me or supply me LPC2103 demo project base on
> >> IAR4.42A.(IAR4.42A setting demo project has no UART :( ,so i hope can
> >> supply me project with UART part)
> >>
> >> Thanks very much! Hope your response!
> >>
> >> Best Regards,
> >> Vincent
> >>
> >>
> >

--- In l..., "Vincent" wrote:
> But file I used is copy from IAR. Since I have no experience in compile
> language.
> Please help me how to set CPSR value in startup.s.
>

Technical support for IAR software is available from:

http://www.iar.com/website1/1.0.1.0/447/1/

--
Chris Burrows
CFB Software
Astrobe: LPC2000 Oberon-07 Development System
http://www.astrobe.com

Hello sir,

Thank you . I found that CPSR bit[7](I bit) = 1 after entered main . So
all IRQ disabled.
In startup.s79 file , it will setup CPSR.
But file I used is copy from IAR. Since I have no experience in compile
language.
Please help me how to set CPSR value in startup.s.

--------------
From: "yytek"
Sent: Wednesday, April 28, 2010 10:26 PM
To:
Cc: "hjiongh"
Subject: Re: [lpc2000] Lpc2103 could not enter UART0 IRQ

> Hello, do you receive one interrupt on send char to PC?
>
> If you can't receive on interrupt, maybe CPSR register of MCU running on
> this mode don't enable IRQ interrupt.
>
> 于 2010-4-28 17:47, hjiongh 写道:
>> Hi,
>> I'm using LPC2103, IAR4.42A. Now I use IAR setup file
>> lpc2xxx_cstartup.s79 and setup a new project.
>> In main funciton , I setup PLL and UART0 as below:
>> ================================>> void SysControl_Init(void)
>> {
>> #ifdef xFLASH
>> MEMMAP=3;
>> #elif xSDRAM
>> MEMMAP = 2; // xSDRAM should be defined in PRO_Sys_Macro.h , modify in
>> the future
>> #elif iRAM
>> MEMMAP = 2;
>> #else
>> MEMMAP=1;
>> #endif
>>
>> APBDIV = 1; // APB bus clock is the same as the processor clock
>>
>> SysControl_Enable_PLL();
>> //SCS = 1;
>>
>> MAMCR = 2; // Per NXP advisory 7/11/05 for correct operation from //
>> flash in stand alone mode
>> MAMTIM = 4;
>>
>> SysControl_VIC_Init();
>>
>> }
>>
>> void SysControl_Enable_PLL(void)
>> {
>> INT8U MValue, PValue;
>>
>> //PLLCON = 0; // Disable PLL, disconnected
>> //PLLFEED = 0xAA;
>> //PLLFEED = 0x55;
>> PLLCFG = PLL_MValue | (PLL_PValue << 5);
>> PLLCON = 1; // Disable PLL, disconnected
>> PLLFEED = 0xAA;
>> PLLFEED = 0x55;
>>
>> while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status
>>
>> MValue = PLLSTAT & 0x0000001F;
>> PValue = (PLLSTAT & 0x00000060) >> 5;
>> while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );
>>
>> PLLCON = 0x03; // Enable PLL, disconnected
>> PLLFEED = 0xAA;
>> PLLFEED = 0x55;
>>
>> //while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check connect bit status
>> }
>>
>> void SysControl_VIC_Init(void)
>> {
>> INT32U i;
>> INT32U *ptr2VectCtrlBase = (unsigned int *)0xFFFFF200;
>> INT32U *ptr2VectAddrBase = (unsigned int *)0xFFFFF100;
>>
>> for(i=0; i<16; i++)
>> {
>> *ptr2VectCtrlBase++ = 0; // Disable all vectored IRQ slots
>> *ptr2VectAddrBase++ = 0; // Clear address of the Interrupt Service
>> routine (ISR) for vectored IRQs
>> }
>>
>> VICIntSelect = 0; // Set all VIC interrupts to IRQ for now
>> VICIntEnClr = 0xFFFFFFFF; // Diasable all interrupts
>> //VICProtection = 0; // VIC registers can be accessed in User or
>> privileged mode
>> VICVectAddr = 0; // Clear interrupt
>> }
>>
>> PINSEL0 &= 0xfffffff0;
>> PINSEL0 |= 0x00000005;
>>
>> U0LCR = 0x83;
>> Fdiv = (Fpclk/16)/UART_BPS;
>> U0DLM = Fdiv/256;
>> U0DLL = Fdiv %256;
>> U0LCR = 0x03;
>>
>> U0FCR = 0x01; //the interrupt will occurs when received one byte data.
>> U0IER = 0x01;
>>
>> VICVectCntl0=0x26;
>> VICVectAddr0 = (INT32U)&UART0_ISR;
>> VICIntEnable |= 0x00000040;
>> ================================>>
>> I only could send string via UART0 successfully , but could not enter
>> UART0 ISR while receive data via UART0.
>>
>> It doubted me that since send string via UART0 is ok, why receive
>> failed. I only use UART as RS232. Also when receive data via UART while
>> debugging, I paused debug and saw U0RBR has data which i send through
>> PC. It's very strange.
>>
>> Hope anyone can help me or supply me LPC2103 demo project base on
>> IAR4.42A.(IAR4.42A setting demo project has no UART :( ,so i hope can
>> supply me project with UART part)
>>
>> Thanks very much! Hope your response!
>>
>> Best Regards,
>> Vincent
>>
>

Hello, do you receive one interrupt on send char to PC?

If you can't receive on interrupt, maybe CPSR register of MCU running on
this mode don't enable IRQ interrupt.

于 2010-4-28 17:47, hjiongh 写道:
> Hi,
> I'm using LPC2103, IAR4.42A. Now I use IAR setup file
> lpc2xxx_cstartup.s79 and setup a new project.
> In main funciton , I setup PLL and UART0 as below:
> ================================> void SysControl_Init(void)
> {
> #ifdef xFLASH
> MEMMAP=3;
> #elif xSDRAM
> MEMMAP = 2; // xSDRAM should be defined in PRO_Sys_Macro.h , modify in
> the future
> #elif iRAM
> MEMMAP = 2;
> #else
> MEMMAP=1;
> #endif
>
> APBDIV = 1; // APB bus clock is the same as the processor clock
>
> SysControl_Enable_PLL();
> //SCS = 1;
>
> MAMCR = 2; // Per NXP advisory 7/11/05 for correct operation from //
> flash in stand alone mode
> MAMTIM = 4;
>
> SysControl_VIC_Init();
>
> }
>
> void SysControl_Enable_PLL(void)
> {
> INT8U MValue, PValue;
>
> //PLLCON = 0; // Disable PLL, disconnected
> //PLLFEED = 0xAA;
> //PLLFEED = 0x55;
> PLLCFG = PLL_MValue | (PLL_PValue << 5);
> PLLCON = 1; // Disable PLL, disconnected
> PLLFEED = 0xAA;
> PLLFEED = 0x55;
>
> while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status
>
> MValue = PLLSTAT & 0x0000001F;
> PValue = (PLLSTAT & 0x00000060) >> 5;
> while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );
>
> PLLCON = 0x03; // Enable PLL, disconnected
> PLLFEED = 0xAA;
> PLLFEED = 0x55;
>
> //while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check connect bit status
> }
>
> void SysControl_VIC_Init(void)
> {
> INT32U i;
> INT32U *ptr2VectCtrlBase = (unsigned int *)0xFFFFF200;
> INT32U *ptr2VectAddrBase = (unsigned int *)0xFFFFF100;
>
> for(i=0; i<16; i++)
> {
> *ptr2VectCtrlBase++ = 0; // Disable all vectored IRQ slots
> *ptr2VectAddrBase++ = 0; // Clear address of the Interrupt Service
> routine (ISR) for vectored IRQs
> }
>
> VICIntSelect = 0; // Set all VIC interrupts to IRQ for now
> VICIntEnClr = 0xFFFFFFFF; // Diasable all interrupts
> //VICProtection = 0; // VIC registers can be accessed in User or
> privileged mode
> VICVectAddr = 0; // Clear interrupt
> }
>
> PINSEL0 &= 0xfffffff0;
> PINSEL0 |= 0x00000005;
>
> U0LCR = 0x83;
> Fdiv = (Fpclk/16)/UART_BPS;
> U0DLM = Fdiv/256;
> U0DLL = Fdiv %256;
> U0LCR = 0x03;
>
> U0FCR = 0x01; //the interrupt will occurs when received one byte data.
> U0IER = 0x01;
>
> VICVectCntl0=0x26;
> VICVectAddr0 = (INT32U)&UART0_ISR;
> VICIntEnable |= 0x00000040;
> ================================>
> I only could send string via UART0 successfully , but could not enter
> UART0 ISR while receive data via UART0.
>
> It doubted me that since send string via UART0 is ok, why receive
> failed. I only use UART as RS232. Also when receive data via UART while
> debugging, I paused debug and saw U0RBR has data which i send through
> PC. It's very strange.
>
> Hope anyone can help me or supply me LPC2103 demo project base on
> IAR4.42A.(IAR4.42A setting demo project has no UART :( ,so i hope can
> supply me project with UART part)
>
> Thanks very much! Hope your response!
>
> Best Regards,
> Vincent

Hi,
I'm using LPC2103, IAR4.42A. Now I use IAR setup file lpc2xxx_cstartup.s79 and setup a new project.
In main funciton , I setup PLL and UART0 as below:
================================void SysControl_Init(void)
{
#ifdef xFLASH
MEMMAP=3;
#elif xSDRAM
MEMMAP = 2; // xSDRAM should be defined in PRO_Sys_Macro.h , modify in the future
#elif iRAM
MEMMAP = 2;
#else
MEMMAP=1;
#endif

APBDIV = 1; // APB bus clock is the same as the processor clock

SysControl_Enable_PLL();

//SCS = 1;

MAMCR = 2; // Per NXP advisory 7/11/05 for correct operation from // flash in stand alone mode
MAMTIM = 4;

SysControl_VIC_Init();

}

void SysControl_Enable_PLL(void)
{
INT8U MValue, PValue;

//PLLCON = 0; // Disable PLL, disconnected
//PLLFEED = 0xAA;
//PLLFEED = 0x55;

PLLCFG = PLL_MValue | (PLL_PValue << 5);
PLLCON = 1; // Disable PLL, disconnected
PLLFEED = 0xAA;
PLLFEED = 0x55;

while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check lock bit status

MValue = PLLSTAT & 0x0000001F;
PValue = (PLLSTAT & 0x00000060) >> 5;
while ((MValue != PLL_MValue) && ( PValue != PLL_PValue) );

PLLCON = 0x03; // Enable PLL, disconnected
PLLFEED = 0xAA;
PLLFEED = 0x55;

//while ( ((PLLSTAT & (1 << 10)) == 0) ); // Check connect bit status
}

void SysControl_VIC_Init(void)
{
INT32U i;
INT32U *ptr2VectCtrlBase = (unsigned int *)0xFFFFF200;
INT32U *ptr2VectAddrBase = (unsigned int *)0xFFFFF100;

for(i=0; i<16; i++)
{
*ptr2VectCtrlBase++ = 0; // Disable all vectored IRQ slots
*ptr2VectAddrBase++ = 0; // Clear address of the Interrupt Service routine (ISR) for vectored IRQs
}

VICIntSelect = 0; // Set all VIC interrupts to IRQ for now
VICIntEnClr = 0xFFFFFFFF; // Diasable all interrupts
//VICProtection = 0; // VIC registers can be accessed in User or privileged mode
VICVectAddr = 0; // Clear interrupt
}
PINSEL0 &= 0xfffffff0;
PINSEL0 |= 0x00000005;

U0LCR = 0x83;
Fdiv = (Fpclk/16)/UART_BPS;
U0DLM = Fdiv/256;
U0DLL = Fdiv %256;
U0LCR = 0x03;

U0FCR = 0x01; //the interrupt will occurs when received one byte data.
U0IER = 0x01;

VICVectCntl0=0x26;
VICVectAddr0 = (INT32U)&UART0_ISR;
VICIntEnable |= 0x00000040;
================================
I only could send string via UART0 successfully , but could not enter UART0 ISR while receive data via UART0.

It doubted me that since send string via UART0 is ok, why receive failed. I only use UART as RS232. Also when receive data via UART while debugging, I paused debug and saw U0RBR has data which i send through PC. It's very strange.

Hope anyone can help me or supply me LPC2103 demo project base on IAR4.42A.(IAR4.42A setting demo project has no UART :( ,so i hope can supply me project with UART part)

Thanks very much! Hope your response!
Best Regards,
Vincent