Hi all...
First, C is not my native language.
There is a very helpful "access the onboard eeprom" library out there, and this is it below.
Now.. all I want to do is hold an integer in the EEPROM, so I can read it after a reboot and use it in my program. I'd like to be able to update the integer now and then while my program is running.
Surely not too hard, if I could make head or tail of the code below, I am pretty sur eI could pop one in and pull it out using the read and write to the EEPROM.
Can anyone who has a better grasp of C than me, please give me a hand ?
thanks in advance.. (hopefully)
Dave.
* IAP demo : demo code for internal EEPROM memory access
*
* LPC11U24FBD64/401 : EEPROM 4KB
* Remark: The top 64 bytes of the EEPROM memory are reserved and cannot be written to.
*
* by Tedd OKANO http://mbed.org/users/okano/notebook/iap-in-application-programming-internal-flash-eras/
* modified by Suga (supported to LPC11U24)
*/
#include "mbed.h"
#include "IAP.h"
#define MEM_SIZE 256
#define TARGET_ADDRESS 64
void memdump( char *p, char *b, int n );
int isprint( int c );
IAP iap;
int main() {
char mem[ MEM_SIZE ]; // memory, it should be aligned to word boundary
char mem2[ MEM_SIZE ];
int r;
printf( "IAP: EEPROM writing test\n" );
printf( " device-ID = 0x%08X, serial# = 0x%08X, CPU running %dkHz\n", iap.read_ID(), iap.read_serial(), SystemCoreClock / 1000 );
for ( int i = 0; i < MEM_SIZE; i++ )
mem[ i ] = i & 0xFF;
r = iap.write_eeprom( mem, (char*)TARGET_ADDRESS, MEM_SIZE );
printf( "copied: SRAM(0x%08X)->EEPROM(0x%08X) for %d bytes. (result=0x%08X)\n", mem, TARGET_ADDRESS, MEM_SIZE, r );
r = iap.read_eeprom( (char*)TARGET_ADDRESS, mem2, MEM_SIZE );
printf( "copied: EEPROM(0x%08X)->SRAM(0x%08X) for %d bytes. (result=0x%08X)\n", TARGET_ADDRESS, mem, MEM_SIZE, r );
// compare
r = memcmp(mem, mem2, MEM_SIZE);
printf( "compare result = \"%s\"\n", r ? "FAILED" : "OK" );
printf( "showing the EEPROM contents...\n" );
memdump( (char*)TARGET_ADDRESS, mem2, MEM_SIZE );
}
void memdump( char *base, char *buf, int n ) {
unsigned int *p;
printf( " memdump from 0x%08X for %d bytes", (unsigned long)base, n );
p = (unsigned int *)((unsigned int)buf & ~(unsigned int)0x3);
for ( int i = 0; i < (n >> 2); i++, p++ ) {
if ( !(i % 4) )
printf( "\n 0x%08X :", (unsigned int)base + i * 4 );
printf( " 0x%08X", *p );
}
printf( "\n" );
}
Hi all...
First, C is not my native language.
There is a very helpful "access the onboard eeprom" library out there, and this is it below. Now.. all I want to do is hold an integer in the EEPROM, so I can read it after a reboot and use it in my program. I'd like to be able to update the integer now and then while my program is running.
Surely not too hard, if I could make head or tail of the code below, I am pretty sur eI could pop one in and pull it out using the read and write to the EEPROM.
Can anyone who has a better grasp of C than me, please give me a hand ?
thanks in advance.. (hopefully)
Dave.
* IAP demo : demo code for internal EEPROM memory access * * LPC11U24FBD64/401 : EEPROM 4KB * Remark: The top 64 bytes of the EEPROM memory are reserved and cannot be written to. * * by Tedd OKANO http://mbed.org/users/okano/notebook/iap-in-application-programming-internal-flash-eras/ * modified by Suga (supported to LPC11U24) */ #include "mbed.h" #include "IAP.h" #define MEM_SIZE 256 #define TARGET_ADDRESS 64 void memdump( char *p, char *b, int n ); int isprint( int c ); IAP iap; int main() { char mem[ MEM_SIZE ]; // memory, it should be aligned to word boundary char mem2[ MEM_SIZE ]; int r; printf( "IAP: EEPROM writing test\n" ); printf( " device-ID = 0x%08X, serial# = 0x%08X, CPU running %dkHz\n", iap.read_ID(), iap.read_serial(), SystemCoreClock / 1000 ); for ( int i = 0; i < MEM_SIZE; i++ ) mem[ i ] = i & 0xFF; r = iap.write_eeprom( mem, (char*)TARGET_ADDRESS, MEM_SIZE ); printf( "copied: SRAM(0x%08X)->EEPROM(0x%08X) for %d bytes. (result=0x%08X)\n", mem, TARGET_ADDRESS, MEM_SIZE, r ); r = iap.read_eeprom( (char*)TARGET_ADDRESS, mem2, MEM_SIZE ); printf( "copied: EEPROM(0x%08X)->SRAM(0x%08X) for %d bytes. (result=0x%08X)\n", TARGET_ADDRESS, mem, MEM_SIZE, r ); // compare r = memcmp(mem, mem2, MEM_SIZE); printf( "compare result = \"%s\"\n", r ? "FAILED" : "OK" ); printf( "showing the EEPROM contents...\n" ); memdump( (char*)TARGET_ADDRESS, mem2, MEM_SIZE ); } void memdump( char *base, char *buf, int n ) { unsigned int *p; printf( " memdump from 0x%08X for %d bytes", (unsigned long)base, n ); p = (unsigned int *)((unsigned int)buf & ~(unsigned int)0x3); for ( int i = 0; i < (n >> 2); i++, p++ ) { if ( !(i % 4) ) printf( "\n 0x%08X :", (unsigned int)base + i * 4 ); printf( " 0x%08X", *p ); } printf( "\n" ); }