基于arm7的(lpc2388)flash的读写操作
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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)，
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
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