本文介绍了IAP在LPC 1768上的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图使用IAP(在应用程序编程中)将一个函数的代码从内存空间中的一个点复制到另一个点(我知道这没有任何用处,但这对于一个项目来说绝对至关重要)正在努力)。
代码的复制似乎可以顺利进行,但是当我调用复制的函数时,它总是会导致硬错误。我正在复制的函数没有任何其他函数或数据的引用(这是一个简单的返回函数),所以不存在相对地址错误的问题。
我在下面给出了我的代码以及我得到的输出。 #includembed.h
#includeIAP.h
#define TARGET_SECTOR 14
char code [1024];
IAP iap;
char val = 0;
typedef int(* function)();
功能闪烁功能;
MPU_Type mpu;
externC
void HardFault_Handler(){
register unsigned int _msp __asm(msp);
printf(Hard Fault!%x(%x)\r\\\
,SCB-> HFSR,*((unsigned int *)(_ msp + 24)));
printf(HFSR:0x%X \ n \r,SCB-> HFSR);
printf(MMFAR:0x%X \ tMMFSR:0x%X \ n \r,SCB-> MMFAR,SCB-> CFSR);
printf(BFAR:0x%X \ tBFSR:0x%X \\\\r,SCB-> BFAR,SCB-> CFSR);
printf( - %x \r\\\
,(*(volatile uint32_t *)0xe000ed24));
// printf(Hard Fault!%x \r \\\
,SCB-> HFSR);
printf(*********** MPU Settings ************* \\\
\r);
printf(TYPE:0x%X \\\
\r,mpu.TYPE);
printf(CTRL:0x%X \\\
\r,mpu.CTRL);
exit(-1);
int blink(){
int a = 1,b = 1;
返回a + b;
void copy_code_ram(){
$ b $ char * charptr;
charptr =(char *)& blink;
int i;
for(i = 0; i code [i] = * charptr;
charptr ++;
void print_function(char * ptr,int num){
for(; num> 0; num - ){
printf(0x%X,* ptr);
ptr ++;
}
}
int main(){
int r;
printf(blink code:\\\
);
print_function((char *)& blink,100);
printf(\\\
\r\\\
\r\\\
\r);
copy_code_ram();
//打印扇区
print_function(sector_start_adress [TARGET_SECTOR],100);
printf(\\\
\r\\\
\r\\\
\r);
iap.prepare(TARGET_SECTOR,TARGET_SECTOR);
iap.erase(TARGET_SECTOR,TARGET_SECTOR);
iap.prepare(TARGET_SECTOR,TARGET_SECTOR);
r = iap.write(code,sector_start_adress [TARGET_SECTOR],256);
printf(\\\
\r\\\
\r\\\
\r); %d字节(结果= 0x%08X)\ r \ n的代码,sector_start_adress [TARGET_SECTOR]为
printf(复制:SRAM(0x%08X) - > Flash(0x%08X) ,1024,r);
printf(\\\
\r\\\
\r\\\
\r);
blinkfunction =(function)(sector_start_adress [TARGET_SECTOR]);
printf(\\\
\r\\\
\r\\\
\r);
print_function((char *)blinkfunction,100);
r = 0;
r = blink();
printf(眨眼的返回值是%d \\\
\r,r);
r = blinkfunction();
printf(blink函数的返回值是%d \ n \ r,r);
while(1){
}
}
以下是输出:
硬故障! 4000000(e000)
HFSR:0x400000000
MMFAR:0xE000ED34 MMFSR:0x20000
BFAR:0xE000ED38 BFSR:0x20000
我认为我在调用函数时做错了什么。有人可以指出我的错误吗?
谢谢
忘记在功能地址中设置 thumb
位:
blinkfunction = (函数)(sector_start_adress [TARGET_SECTOR] | 1);
编译器知道在大多数情况下会设置它,但它不会直接转换为函数指针。
I am trying to use IAP (in application programming) to copy the code of a function from one point in memory space to another (I know this doesn't have any use, but this is absolutely crucial for a project that I'm working on).The copying of the code seems to work with out a hitch, but when I call the copied function it always results in hardfaults. The function I'm copying doesn't have any references to other functions or data (It is a simple return function), so there is no problem of relative address errors.I've given my code below along with the output that I get.
#include "mbed.h"
#include "IAP.h"
#define TARGET_SECTOR 14
char code[1024];
IAP iap;
char val = 0;
typedef int (*function) ();
function blinkfunction;
MPU_Type mpu;
extern "C"
void HardFault_Handler() {
register unsigned int _msp __asm("msp");
printf("Hard Fault! %x (%x)\r\n", SCB->HFSR, *((unsigned int *)(_msp + 24)));
printf("HFSR: 0x%X\n\r", SCB->HFSR);
printf("MMFAR: 0x%X\tMMFSR: 0x%X\n\r", SCB->MMFAR, SCB->CFSR);
printf("BFAR: 0x%X\tBFSR: 0x%X\n\r", SCB->BFAR, SCB->CFSR);
printf(" - %x\r\n", (*(volatile uint32_t*)0xe000ed24));
// printf("Hard Fault! %x\r\n", SCB->HFSR);
printf("*********** MPU Settings *************\n\r");
printf("TYPE: 0x%X\n\r", mpu.TYPE);
printf("CTRL: 0x%X\n\r", mpu.CTRL);
exit(-1);
}
int blink() {
int a = 1, b = 1;
return a + b;
}
void copy_code_ram() {
char *charptr;
charptr = (char *)&blink;
int i;
for(i = 0; i <200 ; i++) {
code[i] = *charptr;
charptr++;
}
}
void print_function(char *ptr, int num) {
for(; num > 0; num--) {
printf("0x%X ", *ptr);
ptr++;
}
}
int main() {
int r;
printf("blink code:\n");
print_function((char *)&blink, 100);
printf("\n\r\n\r\n\r");
copy_code_ram();
//Print sector
print_function(sector_start_adress[TARGET_SECTOR], 100);
printf("\n\r\n\r\n\r");
iap.prepare( TARGET_SECTOR, TARGET_SECTOR);
iap.erase (TARGET_SECTOR, TARGET_SECTOR);
iap.prepare( TARGET_SECTOR, TARGET_SECTOR);
r = iap.write( code, sector_start_adress[TARGET_SECTOR], 256);
printf("\n\r\n\r\n\r");
printf( "copied: SRAM(0x%08X)->Flash(0x%08X) for %d bytes. (result=0x%08X)\r\n", code, sector_start_adress[ TARGET_SECTOR ], 1024, r );
printf("\n\r\n\r\n\r");
blinkfunction = (function) (sector_start_adress[TARGET_SECTOR]);
printf("\n\r\n\r\n\r");
print_function((char *)blinkfunction, 100);
r = 0;
r = blink();
printf("The return value from blink is %d\n\r", r);
r = blinkfunction();
printf("The return value from blinkfunction is %d\n\r", r);
while(1) {
}
}
Here is the output:
Hard Fault! 4000000 (e000)
HFSR: 0x400000000
MMFAR: 0xE000ED34 MMFSR: 0x20000
BFAR: 0xE000ED38 BFSR: 0x20000
I think I'm doing something wrong in calling the function. Can someone please point out my mistake?
Thanks
解决方案
You forgot to set the thumb
bit in the function address:
blinkfunction = (function) (sector_start_adress[TARGET_SECTOR] | 1);
The compiler knows to set this in most cases, but it not in a direct cast to a function pointer.
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