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VC5509中断程序的完整例子
cmd文件
MEMORY
{
PAGE 0:
MMR : origin = 0000000h, length = 00000c0h
SPRAM : origin = 00000c0h, length = 0000040h
VECS : origin = 0000100h, length = 0000100h
DARAM : origin = 0000200h, length = 000FE00h
SARAM0 : origin = 0010000h, length = 0010000h
SARAM1 : origin = 0020000h, length = 0010000h
SARAM2 : origin = 0030000h, length = 0010000h
CE0 : origin = 0040000h, length = 03c0000h
CE1 : origin = 0400000h, length = 0400000h
CE2 : origin = 0800000h, length = 0400000h
CE3 : origin = 0c00000h, length = 03f8000h
PDROM : origin = 0ff8000h, length = 07f00h
PAGE 2: /* -------- 64K-word I/O Address Space -------- */
IOPORT (RWI) : origin = 0x000000, length = 0x020000
}
SECTIONS
{
.vectors : {} > VECS PAGE 0 /* interrupt vector table */
.text : {} > SARAM0 PAGE 0 /* Code */
/* These sections must be on same physical memory page when */
/* small memory model is used */
.data : {} > DARAM PAGE 0 /* Initialized vars */
.bss : {} > DARAM PAGE 0 /* Global & static vars */
.const : {} > DARAM PAGE 0 /* Constant data */
.sysmem : {} > DARAM PAGE 0 /* Dynamic memory (malloc) */
.stack : {} > DARAM PAGE 0 /* Primary system stack */
.sysstack: {} > DARAM PAGE 0 /* Secondary system stack */
.cio : {} > DARAM PAGE 0 /* C I/O buffers */
/* The .switch, .cinit, and .pinit sections may be on any */
/* physical memory page when small memory model is used */
.switch : {} > DARAM PAGE 0 /* Switch statement tables */
.cinit : {} > DARAM PAGE 0 /* Auto-initialization tables */
.pinit : {} > DARAM PAGE 0 /* Initialization fn tables */
.csldata : {} > DARAM PAGE 0
.far : {} > DARAM PAGE 0
.ioport : {} > IOPORT PAGE 2 /* Global & static IO vars */
dmaMem1: {} > SARAM1 PAGE 0
dmaMem2: {} > SARAM2 PAGE 0
}
main.c
#include "stdint.h"
#include "emif.h"
#include "intr.h"
#include "limits.h"
#include "regs55x.h"
#include "type.h"
#include "board.h"
#include "dma55x.h"
#define SIZE 0x4000
#pragma DATA_SECTION(src1,"dmaMem1")
unsigned int src1[SIZE];
#pragma DATA_SECTION(src2,"dmaMem2")
unsigned int src2[SIZE];
#define XBSR_ADDR (0x6C00u) //External Bus Selection Register Address
#define XBSR (*(ioport volatile unsigned int *)XBSR_ADDR)
#define PLLENABLE 4
#define PLLENABLE_SZ 1
#define MyPLL_MULT 10
#define MyPLL_DIV 0 //设置频率10M×10/(1+0)=100M
#define TYPE_16ASYNC 0x1 //001b空间类型为16-bit-wide asynchronous
#define MyCE0_READ_SETUP 0
#define MyCE0_READ_STROBE 2
#define MyCE0_READ_HOLD 2
#define MyCE0_WRITE_SETUP 0 //0
#define MyCE0_WRITE_STROBE 4 //4
#define MyCE0_WRITE_HOLD 2 //2
extern int _vectors;
inline void board_init();
interrupt void Timer0Isr(void);
#define TIMER_PORT0 0
#define PRD_OFFSET 1
#define TCR_OFFSET 2
#define PRSC_OFFSET 3
u32 addr;
unsigned int tcount0;
void main(void)
{
board_init();
INTR_GLOBAL_DISABLE;
IFR0 |= IFR0;
IFR1 |= IFR1;
//Timer0设置
TIMER_INIT(TIMER_PORT0,0xd30,0x3ff,0x3);
hook_interrupt(TINT0_TRAP, Timer0Isr); //hook interrupt vectors
REG_WRITE(IVPH_ADDR,(((u32)&_vectors & 0xffff00) >> 8));
REG_WRITE(IVPD_ADDR,(((u32)&_vectors & 0xffff00) >> 8));
IER0 |= (1<<TINT0); //enable DSP int
INTR_GLOBAL_ENABLE; //enable global interrupts
while (1)
{
};
}
interrupt void Timer0Isr(void) //Timer0中断服务程序
{
// PerformTimer0Isr();
tcount0++;
}
inline void board_init()
{
//下面为设置系统时钟
CLKMD = 0; //强制进入BYPASS mode (b4=0)
while (CLKMD & (1《PLLENABLE)); //等待BYPASS mode激活
CLKMD = ((1《IOB)|(MyPLL_MULT《PLL_MULT)|(MyPLL_DIV《PLL_DIV)|(1《PLL_ENABLE));//IOB=1 则失锁后可重新启动相位锁定过程；PLL_MULT:分子；PLL_DIV：分母
while (!(CLKMD & (1《LOCK))); //等待锁定，时钟稳定下来
/*EMIF 设置*/
EMIF_GCTRL = 0x1;
XBSR=0x0201u; //写External Bus Selection Register
EMIF_CE0_CTRL1 =(TYPE_16ASYNC << MTYPE) |
(MyCE0_READ_SETUP << READ_SETUP) |
(MyCE0_READ_STROBE << READ_STROBE) |
(MyCE0_READ_HOLD << READ_HOLD);
EMIF_CE0_CTRL2 =(MyCE0_WRITE_SETUP << WRITE_SETUP) |
(MyCE0_WRITE_STROBE<< WRITE_STROBE) |
(MyCE0_WRITE_HOLD << WRITE_HOLD) |
(0x1 << EXT_HOLD_WRITE) |
(u16)(0x1 << EXT_HOLD_READ);
EMIF_CE0_CTRL3 = 0;
}
intr.c
#include" intr.h"
extern interrupt void _intr_handler();
extern int _vectors; //Start label of vector table
void hook_interrupt(unsigned int trap, Ip func)
{
unsigned long _branch = 0x6a00ul;
unsigned long _func = (unsigned long)func;
unsigned long *_addr = (unsigned long *)(((unsigned long)&_vectors + (trap * 0x8)) >> 1);
//因为对于一个程序标号来说，它的地址是字节寻址的，也就是说这里的_vectors是字节地址，
//因此再加上trap*8的字节地址偏移后，右移一位除以2，得到的就是字地址，这样在数据空间寻址才是正确的
*_addr = (_branch << 16) | _func;
//B P24指令的机器码为0110 1010 PPPP PPPP PPPP PPPP PPPP PPPP
//_func最多是24位的，（这由5509的寻址空间决定），再前面加上0x6a，就是B func指令
}
void unhook_interrupt(unsigned int trap)
{
unsigned long _branch = 0x6a00ul;
unsigned long _func = (unsigned long)_intr_handler;
unsigned long *_addr = (unsigned long *)(((unsigned long)&_vectors + (trap * 0x8)) >> 1);
*_addr = (_branch << 16) | _func;
}
;=========================================================
; vectors.asm:
;=========================================================
.global __vectors
.global __intr_handler
.global _c_int00
;VECS .set 31
;=========================================================
; Default handler
;=========================================================
.text
__intr_handler
b __intr_handler
;reti ; do nothing
;=========================================================
; Interrupt vectors.
; set trap=vector number
; call sw_trap and passing trap
;=========================================================
.sect ".vectors"
__vectors:
b _c_int00
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
b __intr_handler
nop
nop_16 || nop
.end
另外注意的是编译时选择large模式，由于发帖中左移符号<<显示不正常，用《代替，请各位拷贝后改正
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