ARM原理与C程序设计源代码.zip

#include "flash.h" #define LED1_MASK 0x20 #define LED2_MASK 0x40 #define LED3_MASK 0x80 #define GPCDAT_ADDR (*(volatile unsigned int *)0x56000024) // NAND FLASH Controller Registers Addr. #define NFCONF (*(volatile unsigned int *)0x4E000000) #define NFCMD (*(volatile unsigned int *)0x4E000004) #define NFADDR (*(volatile unsigned int *)0x4E000008) #define NFDATA (*(volatile unsigned int *)0x4E00000C) #define NFSTAT (*(volatile unsigned int *)0x4E000010) #define NFECC (*(volatile unsigned int *)0x4E000014) #define CLKCON (*(volatile unsigned long *) (0x4C00000C)) #define INTMSK (*(volatile unsigned long *) (0x4A000008)) #define GPACON (*(volatile unsigned long *) (0x56000000)) // Flash operator void initFlash(void); void readFlashID(void); void flashRd(unsigned int addr,unsigned int size,unsigned char *buf); void flashErase(unsigned int addr); void flashWr(unsigned int addr,unsigned int size,unsigned char *buf); unsigned int flashID=0; unsigned char flashWhat[iDatN+16*16]; unsigned char flashRdDat[iDatN+16*6]; void Delay(int n) { int i,j; for(i=0;i<n;i++) { for(j=0;j<n;j++) { } } } int main() { int nLED=0; int i,n=0; // initialize NAND Controller initFlash(); readFlashID(); // Erase Block 0:0~16KB flashErase(0x0); // Write flash.h flashWr(0x0,iDatN,FlashDat); flashRd(0,iDatN+16*16,flashWhat); // Flash data,except 16B per 528 for(i=0;i<iDatN+16*16;i++) { n=i/528; if((i>=n*528) && (i<n*528+512)) { flashRdDat[i-n*16]=flashWhat[i]; } } // Above is Nand Flash operator while(1) { nLED = 0; nLED ^=(LED2_MASK | LED3_MASK); // LED1 light GPCDAT_ADDR = nLED; Delay(0x300); nLED = 0; nLED ^=(LED1_MASK | LED3_MASK); // LED2 light GPCDAT_ADDR = nLED; Delay(0x300); nLED = 0; nLED ^=(LED1_MASK | LED2_MASK); // LED3 light GPCDAT_ADDR = nLED; Delay(0x300); } } // Init NAND Controller Reg void initFlash() { INTMSK = 0xFFFFFFFF; CLKCON = 0x0007FFF0; // bit 4 GPACON = 0xFFFFFFFF; NFCONF = (1<<15)|(1<<12)|(0<<11)|(7<<8)|(7<<4)|(7<<0); while(!(NFSTAT & 0x01)); NFCMD = 0xFF; // Reset NAND while(!(NFSTAT & 0x01)); } // Read flash ID void readFlashID() { int i; NFCMD = 0x90; NFADDR = 0x0; for(i=0;i<4;i++) { flashID=flashID | (NFDATA<<((3-i)*8)); while(!(NFSTAT & 0x01)); // Ready? } } // Read flash contents // Here, addr: start address; size: Data size(in byte); buf: data void flashRd(unsigned int addr,unsigned int size,unsigned char *buf) { int i,n=1; while(!(NFSTAT & 0x01)); NFCMD = 0x00 | ((addr>>8) & 0x01); NFADDR = addr & 0xFF; NFADDR = (addr>>9) & 0xFF; NFADDR = (addr>>17) & 0xFF; NFADDR = (addr>>25) & 0x01; while(!(NFSTAT & 0x01)); for(i=0;i<size;i++,n++) { *buf++=NFDATA; if((n%528)==0) // one page read over, wait { while(!(NFSTAT & 0x01)); } } while(i%528) // Read the entire page { NFDATA; i++; } while(!(NFSTAT & 0x01)); } // Erase Block,as 16KB per Block // Use Addr25:14 void flashErase(unsigned int addr) { while(!(NFSTAT & 0x01)); // Ready? NFCMD = 0x60; NFADDR = (addr>>9) & 0xE0; // A25:14 NFADDR = (addr>>17) & 0xFF; NFADDR = (addr>>25) & 0x01; NFCMD = 0xD0; while(!(NFSTAT & 0x01)); } // Program flash // Here, addr: start address; size: Data size(in byte);buf:data // addr % 512 should be 0 void flashWr(unsigned int addr,unsigned int size,unsigned char *buf) { int i=0; int k=0; for(k=0;k<=size/512;k++) { while(!(NFSTAT & 0x01)); // Ready? NFCMD = 0x80; NFADDR = addr & 0xFF; NFADDR = (addr>>9) & 0xFF; NFADDR = (addr>>17) & 0xFF; NFADDR = (addr>>25) & 0x01; for(i=k*512;i<(k+1)*512;i++) { if(i>=size) { break; } NFDATA = *buf++; } NFCMD = 0x10; while(!(NFSTAT & 0x01)); addr += 512; } while(!(NFSTAT & 0x01)); // Ready? }