三星4510B处理器，ADS版本1.2。在调试一段PDIUSBD12程序时总是卡在一个地方，过不去。出错程序如下（带中括号的行都是翻译程序后对应的汇编语句）：
#include "4510.h"
#define alloff 0x3ffff
#define allon 0x0
void delay(unsigned int x)
{
unsigned int i;
unsigned int j;
for(i=0;i<x;i++)
[0xe3a02000] mov r2,#0
[0xea000004] b 0x4001d0 ; (delay + 0x1c)
......
[0xe2822001] add r2,r2,#1
[0xe1520000] cmp r2,r0
[0x3afffff8] bcc 0x4001bc ; (delay + 0x8)
for(j=0;j<230;j++);
[0xe3a01000] mov r1,#0
[0xe2811001] add r1,r1,#1
[0xe35100e6] cmp r1,#0xe6
[0x3afffffc] bcc 0x4001c0 ; (delay + 0xc)
}
[0xe1a0f00e] mov pc,r14
void write_usb_command(unsigned char usb_command)
{
command_usb=usb_command;//写入命令
[0xe59f1084] ldr r1,0x00400268 ; = #0x03fd4000
[0xe5c10001] strb r0,[r1,#1] //每次程序都是卡在这一条语句了，但是看不出来有什么错误啊。
}
[0xe1a0f00e] mov pc,r14
void write_a_usb_data(unsigned char usb_data) //写一字节USB数据
{
data_usb=usb_data;
[0xe59f1078] ldr r1,0x00400268 ; = #0x03fd4000
[0xe5c10000] strb r0,[r1,#0]
}
[0xe1a0f00e] mov pc,r14
int main(void)
{
[0xe52de004] * str r14,[r13,#-4]!
IOPCON=0x0000;
[0xe59f206c] ldr r2,0x0040026c ; = #0x03ff5000
[0xe3a03000] mov r3,#0
[0xe5823004] str r3,[r2,#4]
IOPMOD=0x3ffff;
[0xe59f0064] ldr r0,0x00400270 ; = #0x0003ffff
[0xe5820000] str r0,[r2,#0]
write_usb_command(0xD0);
[0xe3a000d0] mov r0,#0xd0
[0xebfffff1] bl write_usb_command
write_a_usb_data(0xf0);
[0xe3a000f0] mov r0,#0xf0
[0xebfffff2] bl write_a_usb_data
IOPDATA=allon;
[0xe5823008] str r3,[r2,#8]
delay(100);
[0xe3a00064] mov r0,#0x64
[0xebffffe2] bl delay
write_usb_command(0xd8);
[0xe3a000d8] mov r0,#0xd8
[0xebffffea] bl write_usb_command
write_a_usb_data(0x01);
[0xe3a00001] mov r0,#1
[0xebffffeb] bl write_a_usb_data
delay(100);
[0xe3a00064] mov r0,#0x64
[0xebffffdc] bl delay
write_usb_command(0xf3);
[0xe3a000f3] mov r0,#0xf3
[0xebffffe4] bl write_usb_command
write_a_usb_data(0xDA);
[0xe3a000da] mov r0,#0xda
[0xebffffe5] bl write_a_usb_data
write_a_usb_data(0xCB);
[0xe3a000cb] mov r0,#0xcb
[0xebffffe3] bl write_a_usb_data
}
中括号所对应的行都是通过AXD的反汇编功能查看的。程序总是卡在我写注释的地方，在点击“停止”后AXD提示“error:read,mode=255,id=ff0010”或者id为其他一些值。在4510.h中关于PD12我是这样定义：
#define VPchar *(volatile unsigned char *)
#define command_usb (VPchar(0x3FD4001)) //PD12命令
#define data_usb (VPchar(0x3FD4000)) //PD12数据
请高手指点！！！谢谢了。 |
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