STRINGS

The 8051 cannot write to code memory!
Having done this in assembler, you should know that MOVC is a read-only instruction!

If you really need to modify these strings in code memory, you will have to do it by reprogramming the Flash - you will have to read-up on Cygnal's in-application programming support for that!

hello
mr neil, thanks for ur valuable reply ,
ok i will leave code memory , can i write the above 10 byte information to ram or external memory,bcos my second asm programme
reads data that written into memory and converts to the pcm format
now i must write 10 byte information to
any memory location from the console and reading process i have already implemented.
kindly plz look into this matter.
how to input 10byte information , is it possible from scanf

regards
ramesh j

Ramesh, I am not really clear what it is you want to achieve. But if all you want to is to copy a string, you should check whether strcpy() (or one of its siblings) will do what you want. See:

http://www.keil.com/support/man/docs/c51/c51_strcpy.htm

hello
mr neil,this time iam sending my code so that
u can get clear picture of my requirement.
sir
the flash access function is accessed when user press 2 in the print main menu.
now it will ask enter the short message
10 byte information ,
i nead this topic , next i tried to input a string throgh scanf but its not accepting the value what i entered from the menu.
i tried to attach the whole code but its not accepting .
REQUIREMENT I WANT TO WRITE 10 BYTE HEX VALUE
FROM CONSOLE TO CONTROLLER
///////function /////////
void flash_access(void) {

unsigned char xdata *pwrite; // pointer to FLASH used for writes
// NOTE: this pointer must be located

// in <data> or <idata> space!


unsigned char code *pread; // pointer to FLASH used for reads

unsigned char code test_string[10];

printf("ENTER THE SHORT MESSAGE 10 byte length");
gets(test_string);

scanf("%x",test_string);
pread = (unsigned char code *) test_string;
EA_save = EA; saveinterrupt status0;
EA=0; // disable interrupts (precautionary)
SFRPAGE=0X0F;
pwrite = 0x1000; // initialize FLASH write pointer
CCH0CN=0X00;
SFRPAGE=0X0F;
PSBANK=0X01;
SFRPAGE=0X00;
FLSCL |= 0x01; // enable FLASH writes/erases from
PSCTL = 0x01; // MOVX writes target FLASH memory
while (*pread != '\0') { // copy until NULL is detected

*pwrite = *pread; // copy byte

pread++; // advance pointers
pwrite++;
}
*pwrite = '\0'; // NULL-terminate string
SFRPAGE=0X00;
PSCTL = 0x00; // MOVX writes target XRAM
FLSCL &= ~0x01; // disable FLASH writes/erases from

// user software



EA = EA_save; // re-enabl

EA=1;

// while(1);

}




// Support Routines

//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------

// print_menu

//-----------------------------------------------------------------------------

//

// This routine uses prints the command menu to the UART.

//

void print_menu(void)

{





printf("\n\nROTOR TELEMETRY BASEBAND SYSTEM\n");

printf("---------------------------------------\n");

printf("1. BRIDGE BALANCING\n");

printf("2. FLASH MEMORY(READ/WRITE)\n");

printf("3. SHUNT CALIBRATE\n");

printf("4. LEVEL SHIFTING\n");

printf("5. PGA GAIN ADJUST\n");

printf("6. TEMPERATURE SENSOR ADJUST\n");

printf("7. STORE COEFFICIENTS IN EEPROM\n");

printf("8. PCM FORMAT\n");





}

Please read the instructions at the top of the form about posting code.

You need to use the < pre > and < /pre > HTML tags so that it formats properly.

(I've put extra spaces so they display - you need to omit the spaces so that they work!)

ur ... bcos ... plz
answer:
Ramesh, I am not really clear what it is you want

That is obvious

Erik

hello
if any one knows solution plz put a reply.


ramesh

if any one knows solution plz put a reply.
Oh, sorry, I thought you knew.
the spelling is "please"

Erik

"if any one knows solution plz put a reply."

The solution is for you to look up scanf() in the manual and find out whether it does whatever it is you want it to do. If you then think it can do what you want it to do but you cannot get it to work post the non-working code together with a clear description of:

1) what you expect it to do
2) what it actually does

and hopefully someone will be able to help you.

Please note that using SMS style abbreviations makes it much harder to understand your english.

Stefan

Please note that using SMS style abbreviations makes it much harder to understand your english.

Since when is Stupid Monkey $#|+ considered english?

Erik

Hello
iam performing serial communication using cygnal microcontroller.as soon as i will execute code , the user gets menu as mentioned above.when the user goes to option 2 , ie to perform flash / ram reading and writing ,iwant to give some data from the menu that data will write into ram/flash or
any memory area , can u please suggest me
how to get the data into any variable . here
i used scanf statement to input the data
but in keil c the variable is not holding
the data what i entered from the menu .

only technical comments(solution) are invited

Thanking you
ramesh

u need 2 lrn 2 use scanf() rite. 4 ur xampl code below, u need 2 use sscanf() insted.

unsigned char code test_string[10];

printf("ENTER THE SHORT MESSAGE 10 byte length");
gets(test_string);

scanf("%x",test_string);

erik
remember yoou rr in discussion room not in
chat room

mr
erik
i really confused are u a civilized monkey