por lrfad2 » 17 Nov 2006 13:38
Pois é gibim, eu tentei fazer o que vc mencionou mas deu pau. A começar pelo código abaixo. (acusa label duplicado)
org 0x20
dc32 ?cstartup
org 0x24
dc32 __undef_handler
org 0x28
dc32 __swi_handler
org 0x2c
dc32 __prefetch_handler
org 0x30
dc32 __data_handler
org 0x38
dc32 IRQ_Handler
org 0x3c
dc32 FIQ_Interrupt
LTORG
Baseado no que vc me passou + o datasheet do lpc fiz as seguintes rotinas. Vc puder apontar aonde estou errando, eu agradeço.
A situação é a seguinte: O timer esta contanto e resetando quando atinge o valor de T0MR0, mas quando ele reseta deveria gerar uma interrupção, coisa que não esta acontecendo
Configuração do Timer:
void InitTimer0 (void)
{
T0TCR = T0TCR & 0xFE; //Desliga Timer 0
T0TCR = T0TCR | 0x0002; //Reseta contador do Timer 0
T0TCR = T0TCR & 0xFFFD;
T0CTCR=0x00; //seleciona contador como timer
T0TC=0; //zera contador TC
T0PR = 0x00; //incrementa TC a cada PCLK
T0MCR=0X03; //Interrupção do MR0 - Reset Tc qdo Tc=T0Mr0
T0MR0=0x02FFFFFF;
T0TCR = T0TCR | 0x01; //Liga Timer 0
}
Configuração da interrupção
void InitInterrupt (void)
{
VICIntSelect = 0x00000000; // All interrupts are IRQ
VICVectAddr0 = (unsigned) tmr0_handler; // Hold address where Timer0 IRQ service routine starts
VICVectCntl0 = 0x00000024; // Assign slot 0 (the highest) to timer0 interrupt - local "switch" for interrupt is enable
VICIntEnable = 0x00000010; // Timer0 interrupt is enabled
}
Tratamento da interrupçao
__irq void tmr0_handler( void )
{
T0IR |= 0x00000001; //Clear match 0 interrupt
VICVectAddr = 0x00000000; //Dummy write to signal end of interrupt
}//__irq __arm void tmr0_handler( void )
Arquivo de configuração s.79
;-----------------------------------------------------------------------------
; This file contains the startup code used by the ICCARM C compiler.
;
; The modules in this file are included in the libraries, and may be replaced
; by any user-defined modules that define the PUBLIC symbol _program_start or
; a user defined start symbol.
; To override the cstartup defined in the library, simply add your modified
; version to the workbench project.
;
; All code in the modules (except ?RESET) will be placed in the ICODE segment.
;
; $Revision: 1.2 $
;
;-----------------------------------------------------------------------------
;
; Naming covention of labels in this file:
;
; ?xxx - External labels only accessed from assembler.
; __xxx - External labels accessed from or defined in C.
; xxx - Labels local to one module (note: this file contains
; several modules).
; main - The starting point of the user program.
;
;---------------------------------------------------------------
; Macros and definitions for the whole file
;---------------------------------------------------------------
; Mode, correspords to bits 0-5 in CPSR
MODE_BITS DEFINE 0x1F ; Bit mask for mode bits in CPSR
USR_MODE DEFINE 0x10 ; User mode
FIQ_MODE DEFINE 0x11 ; Fast Interrupt Request mode
IRQ_MODE DEFINE 0x12 ; Interrupt Request mode
SVC_MODE DEFINE 0x13 ; Supervisor mode
ABT_MODE DEFINE 0x17 ; Abort mode
UND_MODE DEFINE 0x1B ; Undefined Instruction mode
SYS_MODE DEFINE 0x1F ; System mode
;---------------------------------------------------------------
; ?RESET
; Reset Vector.
; Normally, segment INTVEC is linked at address 0.
; For debugging purposes, INTVEC may be placed at other
; addresses.
; A debugger that honors the entry point will start the
; program in a normal way even if INTVEC is not at address 0.
;---------------------------------------------------------------
MODULE ?RESET
COMMON INTVEC:CODE:NOROOT(2)
PUBLIC __program_start
EXTERN ?cstartup
; EXTERN undef_handler, swi_handler, prefetch_handler
; EXTERN data_handler, fiq_handler
; EXTERN irq_handler
CODE32 ; Always ARM mode after reset
org 0x00
__program_start
ldr pc,=?cstartup ; Absolute jump can reach 4 GByte
; ldr b,?cstartup ; Relative branch allows remap, limited to 32 MByte
org 0x04
undef_handler ldr pc,=undef_handler
org 0x08
swi_handler ldr pc,=swi_handler
org 0x0c
prefetch_handler ldr pc,=prefetch_handler
org 0x10
data_handler ldr pc,=data_handler
org 0x18
irq_handler ldr pc,=irq_handler
org 0x1c
fiq_handler ldr pc,=fiq_handler
; Constant table entries (for ldr pc) will be placed at 0x20
; org 0x20
LTORG
; ENDMOD __program_start
ENDMOD
;---------------------------------------------------------------
; ?CSTARTUP
;---------------------------------------------------------------
MODULE ?CSTARTUP
RSEG IRQ_STACK:DATA(2)
RSEG SVC_STACK:DATA:NOROOT(2)
RSEG CSTACK:DATA(2)
RSEG ICODE:CODE:NOROOT(2)
PUBLIC ?cstartup
EXTERN ?main
; Execution starts here.
; After a reset, the mode is ARM, Supervisor, interrupts disabled.
CODE32
?cstartup
; Add initialization nedded before setup of stackpointers here
; Initialize the stack pointers.
; The pattern below can be used for any of the exception stacks:
; FIQ, IRQ, SVC, ABT, UND, SYS.
; The USR mode uses the same stack as SYS.
; The stack segments must be defined in the linker command file,
; and be declared above.
mrs r0,cpsr ; Original PSR value
bic r0,r0,#MODE_BITS ; Clear the mode bits
orr r0,r0,#IRQ_MODE ; Set IRQ mode bits
msr cpsr_c,r0 ; Change the mode
ldr sp,=SFE(IRQ_STACK) & 0xFFFFFFF8 ; End of IRQ_STACK
bic r0,r0,#MODE_BITS ; Clear the mode bits
orr r0,r0,#SYS_MODE ; Set System mode bits
msr cpsr_c,r0 ; Change the mode
ldr sp,=SFE(CSTACK) & 0xFFFFFFF8 ; End of CSTACK
#ifdef __ARMVFP__
; Enable the VFP coprocessor.
mov r0, #0x40000000 ; Set EN bit in VFP
fmxr fpexc, r0 ; FPEXC, clear others.
; Disable underflow exceptions by setting flush to zero mode.
; For full IEEE 754 underflow compliance this code should be removed
; and the appropriate exception handler installed.
mov r0, #0x01000000 ; Set FZ bit in VFP
fmxr fpscr, r0 ; FPSCR, clear others.
#endif
; Add more initialization here
; Continue to ?main for more IAR specific system startup
ldr r0,=?main
bx r0
LTORG
ENDMOD
END
Arquivo de configuração .xcl
// Generated : 10/27/06 16:28:26
//**********************************************************************
// XLINK template command file to be used with the ICCARM C/C++ Compiler
//
// Usage: xlink -f lnkarm <your_object_file(s)>
// -s <program start label> <C/C++ runtime library>
//
// $Revision: 1.3 $
//
//**********************************************************************
//*************************************************************************
// In this file it is assumed that the system has the following
// memory layout:
//
// Exception vectors [0x000000--0x00001F] RAM or ROM
// ROMSTART--ROMEND [0x008000--0x0FFFFF] ROM (or other non-volatile memory)
// RAMSTART--RAMEND [0x100000--0x7FFFFF] RAM (or other read/write memory)
//
// -------------
// Code segments - may be placed anywhere in memory.
// -------------
//
// INTVEC -- Exception vector table.
// SWITAB -- Software interrupt vector table.
// ICODE -- Startup (cstartup) and exception code.
// DIFUNCT -- Dynamic initialization vectors used by C++.
// CODE -- Compiler generated code.
// CODE_I -- Compiler generated code declared __ramfunc (executes in RAM)
// CODE_ID -- Initializer for CODE_I (ROM).
//
// -------------
// Data segments - may be placed anywhere in memory.
// -------------
//
// CSTACK -- The stack used by C/C++ programs (system and user mode).
// IRQ_STACK -- The stack used by IRQ service routines.
// SVC_STACK -- The stack used in supervisor mode
// (Define other exception stacks as needed for
// FIQ, ABT, UND).
// HEAP -- The heap used by malloc and free in C and new and
// delete in C++.
// INITTAB -- Table containing addresses and sizes of segments that
// need to be initialized at startup (by cstartup).
// CHECKSUM -- The linker places checksum byte(s) in this segment,
// when the -J linker command line option is used.
// DATA_y -- Data objects.
//
// Where _y can be one of:
//
// _AN -- Holds uninitialized located objects, i.e. objects with
// an absolute location given by the @ operator or the
// #pragma location directive. Since these segments
// contain objects which already have a fixed address,
// they should not be mentioned in this linker command
// file.
// _C -- Constants (ROM).
// _I -- Initialized data (RAM).
// _ID -- The original content of _I (copied to _I by cstartup) (ROM).
// _N -- Uninitialized data (RAM).
// _Z -- Zero initialized data (RAM).
//
// Note: Be sure to use end values for the defined address ranges.
// Otherwise, the linker may allocate space outside the
// intended memory range.
//*************************************************************************
//************************************************
// Inform the linker about the CPU family used.
//************************************************
-carm
//*************************************************************************
// Segment placement - General information
//
// All numbers in the segment placement command lines below are interpreted
// as hexadecimal unless they are immediately preceded by a '.', which
// denotes decimal notation.
//
// When specifying the segment placement using the -P instead of the -Z
// option, the linker is free to split each segment into its segment parts
// and randomly place these parts within the given ranges in order to
// achieve a more efficient memory usage. One disadvantage, however, is
// that it is not possible to find the start or end address (using
// the assembler operators .sfb./.sfe.) of a segment which has been split
// and reformed.
//
// When generating an output file which is to be used for programming
// external ROM/Flash devices, the -M linker option is very useful
// (see xlink.pdf for details).
//*************************************************************************
//*************************************************************************
// Read-only segments mapped to ROM.
//*************************************************************************
//************************************************
// Address range for reset and exception
// vectors (INTVEC).
// The vector area is 32 bytes,
// an additional 32 bytes is allocated for the
// constant table used by ldr PC in cstartup.s79.
//************************************************
-Z(CODE)INTVEC=0-3F
//************************************************
// Startup code and exception routines (ICODE).
//************************************************
-Z(CODE)ICODE,DIFUNCT=40-7FFFF
-Z(CODE)SWITAB=40-7FFFF
//************************************************
// Code segments may be placed anywhere.
//************************************************
-Z(CODE)CODE=40-7FFFF
//************************************************
// Original ROM location for __ramfunc code copied
// to and executed from RAM.
//************************************************
-Z(CONST)CODE_ID=40-7FFFF
//************************************************
// Various constants and initializers.
//************************************************
-Z(CONST)INITTAB,DATA_ID,DATA_C=40-7FFFF
-Z(CONST)CHECKSUM=40-7FFFF
//*************************************************************************
// Read/write segments mapped to RAM.
//*************************************************************************
//************************************************
// Data segments.
//************************************************
-Z(DATA)DATA_I,DATA_Z,DATA_N=40000000-40007FFF
//************************************************
// __ramfunc code copied to and executed from RAM.
//************************************************
-Z(DATA)CODE_I=40000000-40007FFF
//************************************************
// ICCARM produces code for __ramfunc functions in
// CODE_I segments. The -Q XLINK command line
// option redirects XLINK to emit the code in the
// CODE_ID segment instead, but to keep symbol and
// debug information associated with the CODE_I
// segment, where the code will execute.
//************************************************
-QCODE_I=CODE_ID
//*************************************************************************
// Stack and heap segments.
//*************************************************************************
-Z(DATA)CSTACK+2000=40000000-40007FFF
-Z(DATA)IRQ_STACK+100=40000000-40007FFF
-Z(DATA)HEAP+4000=40000000-40007FFF
//**********************************************************************
// Output user defined segments
//**********************************************************************
//*************************************************************************
// ELF/DWARF support.
//
// Uncomment the line "-Felf" below to generate ELF/DWARF output.
// Available format specifiers are:
//
// "-yn": Suppress DWARF debug output
// "-yp": Multiple ELF program sections
// "-yas": Format suitable for debuggers from ARM Ltd (also sets -p flag)
//
// "-Felf" and the format specifiers can also be supplied directly as
// command line options, or selected from the Xlink Output tab in the
// IAR Embedded Workbench.
//*************************************************************************
// -Felf