基于arm7的(lpc2388)flash的读写操作 -

开始工作不久就碰到一个flash读写的问题。是一块lpc2388的芯片(arm7)，

本文引用地址: http://www.21ic.com/app/mcu/201806/764598.htm

开始总是抱着一arm11的flash读写的方式去看数据手册。看了好长时间都没有一个很好的解决方发。

后来我在keil的库文件中找到：flash的写入方式。如下：//C:KeilARMFlashLPC2888FlashPrg.c

/*

* Program Page in Flash Memory

* Parameter: adr: Page Start Address

* sz: Page Size

* buf: Page Data

* Return Value: 0 - OK, 1 - Failed

*/

int ProgramPage (unsigned long adr, unsigned long sz, unsigned char *buf) {

unsigned long i;

// Preset data latches

F_CTRL = FC_CS | FC_FUNC | FC_WEN | FC_SET_DATA;

F_CTRL = FC_CS | FC_FUNC | FC_WEN;

// Set timer register for programming

F_PROG_TIME = 800 | FPT_ENABLE;

// If size is not whole number of words,

// fill rest of last word with 0xFF

if ((sz%4) != 0) {

*((unsigned long *)buf+(sz/4)) |= or_mask[sz%4];

}

// Load data to data latches

for (i = 0; i < ((sz+3)/4); i++) {

M32(adr) = *((unsigned long *)buf);

buf += 4;

adr += 4;

}

// Load remaining bytes to full page (512) with 0xFF

for (i = ((sz+3)/4); i < (512/4); i++) {

M32(adr) = 0xFFFFFFFF;

adr += 4;

}

// Issue program command

F_CTRL = FC_CS | FC_FUNC | FC_PROTECT | FC_PROG_REQ;

while (!(F_STAT & FS_DONE)); // Wait command to finish

// Disable timer

F_PROG_TIME = 0;

return (0); // Done successfully

}

这里有很清晰的flash的写入方式，可是读取的方式了。

于是在看手册想找到一个寄存器之类的，进行读取啊。《LPC2388中文资料》在这里居然还是没找到，看下英文的吧，可是英文水平不咋的，还是无济于事啊。

**Arm7(lpc2388)Flash的读取**

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后来在经理的帮助下原来lpc2388的flash的读写是这么的简单啊。（其他的单片机没有用到，我想arm系列的单片机可能都是这样子的了）

#define DestAddr 0x00038000 ///276k 0X0007CFFF

//就是一个flash的起始地址，

/*

recindex是一个其实地址的便宜，可以这样理解，可以根据自己的需要便宜，可以是任意值(0~1024)具体的范围的看数据手册。

adata是数据的保存，就是你分配的内存空间

*/

uint32 flash_read_256( int recindex, unsigned char *adata )

{

unsigned int addr = DestAddr + recindex*256 ;

//把地址加出来

unsigned char *intd = (unsigned char *)addr , no ;

//转下

memcpy( adata , intd , 230 ) ;

//直接memcpy()以内存读取的方式把flash的数据保存到内存中。230是你读取的数据长度，读取的数据长度是随意的，可以是1个也可以使256个，只要你个的内存可以放的下就行了

return 1 ;

}

这是写的代码：在下面是我自己整理的代码

/*

* Erase Sector in Flash Memory

* Parameter: adr: Sector Address

* Return Value: 0 - OK, 1 - Failed

*/

int EraseSector (unsigned long adr) {

unsigned long n;

n = GetSecNum(adr); // Get Sector Number

IAP.cmd = 50; // Prepare Sector for Erase

IAP.par[0] = n; // Start Sector

IAP.par[1] = n; // End Sector

IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command

if (IAP.stat) return (1); // Command Failed

IAP.cmd = 52; // Erase Sector

IAP.par[0] = n; // Start Sector

IAP.par[1] = n; // End Sector

IAP.par[2] = CCLK; // CCLK in kHz

IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command

if (IAP.stat) return (1); // Command Failed

return (0); // Finished without Errors

}

/*

* Program Page in Flash Memory

* Parameter: adr: Page Start Address

* sz: Page Size

* buf: Page Data

* Return Value: 0 - OK, 1 - Failed

*/

int ProgramPage (unsigned long adr, unsigned long sz, unsigned char *buf) {

unsigned long n;

#if SET_VALID_CODE != 0 // Set valid User Code Signature

if (adr == 0) { // Check for Vector Table

n = *((unsigned long *)(buf + 0x00)) +

*((unsigned long *)(buf + 0x04)) +

*((unsigned long *)(buf + 0x08)) +

*((unsigned long *)(buf + 0x0C)) +

*((unsigned long *)(buf + 0x10)) +

*((unsigned long *)(buf + 0x14)) +

*((unsigned long *)(buf + 0x18));

*((unsigned long *)(buf + 0x1C)) = 0 - n; // Signature at Reserved Vector

}

#endif

n = GetSecNum(adr); // Get Sector Number

IAP.cmd = 50; // Prepare Sector for Write

IAP.par[0] = n; // Start Sector

IAP.par[1] = n; // End Sector

IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command

if (IAP.stat) return (1); // Command Failed

IAP.cmd = 51; // Copy RAM to Flash

IAP.par[0] = adr; // Destination Flash Address

IAP.par[1] = (unsigned long)buf; // Source RAM Address

IAP.par[2] = 1024; // Fixed Page Size

IAP.par[3] = CCLK; // CCLK in kHz

IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command

if (IAP.stat) return (1); // Command Failed

return (0); // Finished without Errors

}

自由发挥的：

/*

块的选择

*/

int SelSector(unsigned char sec1,unsigned char sec2)

{

flash_paramin[0] = IAP_SELECTOR;

flash_paramin[1] = sec1;

flash_paramin[2] = sec2;

(*(void(*)())STAT_ADR)(flash_paramin,flash_paramout);

//STAT_ADR是需要查数据手册来确定地址的。就是一个地址

return(flash_paramout[0]);

}

//擦除

Int EraseSector(unsigned int sec1,unsigned int sec2)

{

flash_paramin[0] = IAP_ERASESECTOR;

flash_paramin[1] = sec1;

flash_paramin[2] = sec2;

flash_paramin[3] = IAP_FCCLK;

(*(void(*)())STAT_ADR)(flash_paramin,flash_paramout);

return(flash_paramout[0]);

}

//写入

int RamToFlash(unsigned int dst, unsigned int src, unsigned int no)

{

flash_paramin[0] = IAP_RAMTOFLASH;

flash_paramin[1] = dst;

flash_paramin[2] = src;

flash_paramin[3] = no;

flash_paramin[4] = IAP_FCCLK;

(*(void(*)())STAT_ADR)(flash_paramin,flash_paramout);

return(flash_paramout[0]);

}

//比较

int flash_Compare(unsigned int dst, unsigned int src, unsigned int no)

{

flash_paramin[0] = IAP_COMPARE;

fl