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zamzam23
Joined: 25 Aug 2010
Posts: 47
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| strcpy error with working pic18F46K22 and SD Card |
 Posted: Wed Nov 14, 2018 10:53 am |
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Hi,
I am working on writing float values to SD card with 18F46K22.
I didn't get error with writes up to 9 characters but when I write 15 characters, I get error just 10 and 11th characters. The other characters are normal.
Where is my mistake according to you?
thanks.
Here is sdcard.mmc my output:
| Code: | 1W,21V //no error
2W,21V //no error
1W,21VXY //no error
2W,21VXY //no error
1W,21VXYAIDEFGH //error 10 and 11th character
2W,21VXYAIDEFGH //the other characters are normal |
here is my strcopy() code and types of variables:
| Code: | char msg[25];
float p_akim, p_voltaj, power_yeni = 0.0, power_eski= 0.0;
char textt[]="";
sprintf(textt,"\r\n%0.0fW,%0.0fVXYABCDEFGH",round(power_yeni,0),round(p_voltaj,0));
strcpy(msg,text);
fputstring(msg,f); |
mmc.c driver (Tomi's)
| Code: | ////////////////////////////////////////////////////////////////////////
/////////////////// FAT32 DRIVER FOR MMC OVER SPI //////////////////////
////////////////////////////////////////////////////////////////////////
//// Original code by Tamas Bodorics (Tomi), ////
//// http://www.ccsinfo.com/forum/viewtopic.php?t=23969 ////
//// Modified by Mattias "miniman" Eriksson, Sweden ////
//// Disclaimer: ////
//// This code is provided for you "AS IS", this means I can NOT be ////
//// held responsible for any damage or harm it may couse. ////
////////////////////////////////////////////////////////////////////////
//// Hardware: ////
//// This is the hardware I use. My pic is running at 5v, the MMC ////
//// at 3.3V, so I need voltage level conversion. That is what ////
//// the resistors and zener diodes are for. First a 820 ohm ////
//// resistor from is connected to the pic, then a 3.3V ////
//// zenerdiode is connected with its anode to ground and its ////
//// cathode to the resistor. This resistor-zenerdiode connection ////
//// leaves about 3V on the DATA/CS/CLOCK lines which is enough. ////
//// A 100K pull-up resistor from Data out(Do) of the MMC is ////
//// required. Note: this "picture" do not have the right pin ////
//// assignments. Hope you can see what I'm trying to paint.. ////
//// ////
//// __ __ 3x820 ohm ______________ ////
//// | U |--\/\/\----------- o---DATA->---|=2 | ////
//// | PIC |--\/\/\-------o----+---CS--->---|=1 | ////
//// | |--\/\/\--o----+----+---CLOCK>---|=5 MMC | ////
//// | | _|_, _|_, _|_, o--|=7 | ////
//// | | '/_\ '/_\ '/_\ | \_____________| ////
//// | | GND_|____|____|_GND | 100k ohm ////
//// |_____|-----------<-DATA-<----------o--\/\/\---<3.3V ////
//// ////
//// Notes: ////
//// - The card that is going to be used by this code has to be ////
//// pre-formated with FAT32, 512byte/sector. To do this, run cmd ////
//// and type the following command: ////
//// format X: /A:512 /V:LABEL /FS:FAT32 ////
//// where X is the diverletter of your card and LABEL is the ////
//// volyme name. This can also be done in the diskmanager ////
//// - Use '/' as directory separator, example: "MYDIR/ELEMENT.WND" ////
//// "MYDIR/SUBDIR/OTHER.TXT" etc. ////
//// ////
//// Functions: ////
//// MMCInit() ////
//// Initializes the MMC, this function must be called before ////
//// any other MMC functions, and at the top of the program. ////
//// Returns a MMCResponse. ////
//// InitFAT() ////
//// Initializes the FAT filesystem, this function must be ////
//// called before any other MMC functions and after MMCInit, ////
//// only if the later one returned MMC_OK. ////
//// Returns a MMCResponse. ////
//// InitList(char *path) ////
//// Initializes file and directory listing in the any ////
//// directory that is specified by path. To list files and ////
//// directorys in root directory path should be a empty ////
//// string(""). Ottherwise path should end with a "/" e.g: ////
//// "DIR/SUBDIR/". Returns a filehandle. ////
//// Listfiles(char f) ////
//// List files and directorys in any directory that have been ////
//// openes by InitList(). Access the list through FileList ////
//// array. See examples. There can only be one file handle ////
//// open for file listing at the same time. Returns the ////
//// number of files and directorys that where listed. ////
//// NextPage(char f) ////
//// To be able to handle many files in a dir, file listing ////
//// is parted up in pages. To list next page, call NextPage ////
//// and then ListFiles again. ListFiles must be called ////
//// before a NextPage function, otherwise the function will ////
//// not have any effect. Returns a MMCResponse. ////
//// SetPage(char f) ////
//// Set the page that you want to list, see above function ////
//// to get better understanding. Note: no need to call ////
//// ListFiles before this function. Returns a MMCResponse. ////
//// CloseList(char f) ////
//// Closes filelisting, in other words, the there are an ////
//// extra free file handle to use. Returns a MMCResponse ////
//// FreeList() ////
//// Frees all the strings in FileList array. This function ////
//// is called before any new files are listed in ListFiles ////
//// but not in CloseList. THis means you can access the last ////
//// listed files even though you already have closed the ////
//// list. But to free the mem that are used by FileList call ////
//// this function. ////
//// fopen(char *fname, char mode) ////
//// Opens a file specified by fname in the desired mode. ////
//// Valid modes are: 'r' = read, 'w' = write and 'a' = append ////
//// No long filenames can be used. To open a file with long ////
//// filename, listed by ListFiles(), use the shortName field ////
//// in the FileList, FileList[i].shortName. Note: ListFiles ////
//// do only filename, not the path.. ////
//// Returns a filehandle if succeed, else a errorcode ////
//// fclose(char f) ////
//// Closes a file that previously have been opened by fopen. ////
//// Returns a MMCResponse ////
//// fputch(char be, char f) ////
//// Puts a char, be, in file f that previously have been ////
//// opened by fopen. Returns a MMCResponse ////
//// fgetch(char *ki, char f) ////
//// get a char from file f that previously have been opened ////
//// by fopen, and puts it at the position specified by ki ////
//// Returns a MMCSresponse ////
//// fputstring(char *be, char f) ////
//// puts a entire string to file f that previously have been ////
//// opened by fopen. Returns MMCResponse ////
//// fread(char *buffer, int16 leng, char f) ////
//// Reads a block of data with length leng from file f that ////
//// previously have been opened by fopen. ////
//// Returns the number of bytes that were read. ////
//// fwrite(char *buffer, int16 leng, char f) ////
//// Writes a block of data with length leng to a file f that ////
//// previously have been opened by fopen. ////
//// Returns a MMCResponse ////
//// getfsize(char *fname, int32 *fsiz) ////
//// Reads the size of a file with a filename specified by ////
//// fname. Returns a MMCResponse. ////
//// ////
//// Examples: ////
//// // This example open a file for append, and writes "System ////
//// // started". It also shows small error handling ////
//// char f,gfilename[12]; ////
//// strcpy(gfilename,"EVENTS.LOG"); ////
//// f = fopen(gfilename,'a'); // open EVENTS.LOG for append ////
//// if (f & MMC_ERROR) ////
//// { ////
//// printf("Couldn't open file!\r\n"); ////
//// if(f == MMC_NO_CARD_INSERTED) ////
//// printf("Please, insert MMC!"); ////
//// else if(f == MMC_MAX_FILES_REACHED) ////
//// printf("ops.. =)"); ////
//// } ////
//// else ////
//// { ////
//// strcpy(msg,"System started\r\n"); ////
//// fputstring(msg,f); ////
//// fclose(f); ////
//// } ////
//// ////
//// // Here is a exampel that covers almost everything... ////
//// // It first lists all files and dirs in DIR/ and then open ////
//// // The first and prints the file with printf, take a look: ////
//// #include <MMC_SPI_FAT32.h> // As usual you also need to ////
//// #include <MMC_SPI_FAT32.c> // include your device .h file... ////
//// void main(void) ////
//// { ////
//// char f,filename[20],res,i,c; ////
//// while(TRUE) ////
//// { ////
//// if(MMCInit() == MMC_OK) ////
//// { ////
//// printf("MMC initialized\r\n"); ////
//// InitFAT(); ////
//// strcpy(filename,"DIR/"); ////
//// f = InitList(filename); ////
//// if(f & MMC_ERROR) ////
//// printf("Error"); ////
//// else ////
//// { ////
//// do ////
//// { ////
//// res = ListFiles(f); ////
//// for(i=0;i<res;i++) ////
//// { ////
//// printf(FileList[i].name); ////
//// if(FileList[i].isDir) ////
//// printf("\\\r\n");//a "\" with row break ////
//// else ////
//// printf("\r\n"); ////
//// } ////
//// } while(NextPage(f) == MMC_OK); ////
//// CloseList(f); // frees the file, but the list is ////
//// } // still there... ////
//// strcpy(filename,FileList[0].shortName); ////
//// f = open(filename,'r'); // open file for reading ////
//// if((f & MMC_ERROR) == 0) // No error, same as ////
//// { // if(f < MAXFILES) ////
//// while(fgetch(&c,f) == MMC_OK) ////
//// printf(c); ////
//// fclose(f); ////
//// } ////
//// else if(f == MMC_NOT_FOUND) ////
//// printf("1st file in list was probebly a dir"); ////
//// else ////
//// printf("Other error\r\n"); ////
//// while(TRUE) ////
//// ; // Loop forever, program is finished ////
//// } ////
//// else ////
//// printf("MMC init failed!\r\n"); ////
//// delay_ms(1000); ////
//// printf("Trying once more..\r\n"); ////
//// } ////
//// } ////
//// ////
////////////////////////////////////////////////////////////////////////
//// Changelog: ////
//// YYYY-MM-DD VER LOG ////
//// 2007-08-15 0.9 Fixed a hardware SPI error in writesector. ////
//// Thanks to wielen who found the bug. ////
//// 2007-07-25 0.8 This, and almost all other text is written ////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// If you want to use software SPI keep this line uncommented
// If you want to use hardware SPI comment this line..
// Software SPI are slower, but you can use any clock and data
// pins that you want..
#define MMC_SPI_SOFTWARE
// Change the port to whatever port you are going to use
//#use FAST_IO(C)
// Change this to set the right tris for your pins
#define SET_MMC_TRIS() set_tris_C(0x10) // 0b0001000 1=input,0=output
// Change these pins to whatever pins you are using
#define ChipSel pin_C6 // Chip-Select pin
#define ChipClk pin_C3 // SPI-Clock pin
#define ChipDout pin_C5 // SPI-Data out pin
#define ChipDin pin_C4 // SPI-Data in pin
#ifdef MMC_SPI_SOFTWARE
// You can also specify a baud-rate in the line below, if not the fastest possible speed will be used.
// For me that was 800kHz on a 18F4550 with 48MHz external clock
#USE SPI(MASTER, SAMPLE_RISE, MSB_FIRST, IDLE=1, DI=ChipDin, DO=ChipDout, CLK=ChipClk, BITS=8, STREAM=MMC_SPI)
#define MMC_Xfer(a) SPI_Xfer(MMC_SPI,a)
#else
// If MMC_SPI_SOFTWARE isn't defined (se above) these variables are used, you should check if they
// matches your target device, but for most pic's they should do
#byte SSPBUF = 0xFC9
#byte SSPSTAT = 0xFC7
#byte SSPCON1 = 0xFC6
#bit BF = SSPSTAT.0
#endif
#ifdef ENABLE_FILELISTNG
#include <STDLIBM.H> // used for malloc and free functions
#endif
int32 FATTable[128];
int32 gFirstEmptyCluster;
FAT32Vars gFAT32Vars;
diskinforec DiskInfo;
FILE gFiles[MAXFILES];
// Time stores the date and time, this is used when writing and/or creating files
TimeRecord Time;
#ifdef ENABLE_FILELISTNG
// Set the maximum number of files/dirs to be listed by Listfile()
#define MAX_FILE_LIST 10
// Variables used by InitList(), ListFiles(), NextPage() and SetPage()
ListPos StartList;
ListPos CurrentList;
BOOLEAN changeList; // Do not use this; it is only used by SetPage() and ListFiles() and Initialized by InitFAT()
// The result of ListFiles() function..
LongFileName FileList[MAX_FILE_LIST];
#endif
#byte MMCAddressL = gFAT32Vars
#byte MMCAddressH = gFAT32Vars+1
#byte MMCAddressHL = gFAT32Vars+2
#byte MMCAddressHH = gFAT32Vars+3
#byte gStartSectorL = gFAT32Vars+8
#byte gStartSectorH = gFAT32Vars+9
#byte gStartSectorHL = gFAT32Vars+10
// You should check that these values matches your pic device
// but for most devices they should be correct
#define FSR0L *0xFE9
#define POSTINC0 *0xFEE
// A bunch of error codes
#define MMC_OK 0
#define MMC_ERROR 0x80
#define MMC_INVALID_FILE 0x88
#define MMC_MAX_FILES_REACHED 0x90
#define MMC_NO_CARD_INSERTED 0x98
#define MMC_TIME_OUT 0xA0
#define MMC_INVALID_RESPONSE 0xA8
#define MMC_NOT_FOUND 0xB0
#define MMC_INVALID_CLUSTER 0xB8
#define MMC_END_OF_DIR 0xC0
#define MMC_INVALID_POSITION 0xC8
// I don't like having constants in the code... yeah, I do have some anyway ;)
#define END_OF_DIR 17
#define DIRENTRYS_PER_SECTOR 16
#define CHARACTERS_IN_LONG_FILENAMES 13
// If you want to have a cardinserted sens-pin, define CardInserted to a input, like:
// #define CardInserted !input(PIN_XX)
// MMC Card have two GND pins, pull one up with a resistor (10K or somwthing like that) to Vcc
// and connect to desired pin
#define CardInserted() 1
// Looks a bit nicer in the code
#define MMC_Select() output_low(ChipSel)
#define MMC_Deselect() output_high(ChipSel)
// Below this, there should be no need to change anything
char IsSelfDir(char *be)
{
if (be[0] == '.' && be[1] == '.')
return 0xFF;
else
return 0;
}
void MMCOut(char indata)
{
#ifdef MMC_SPI_SOFTWARE
MMC_Xfer(indata);
#else
char i;
SSPBUF=indata;
while (!BF);
i = SSPBUF;
#endif
}
void MMC8Clock()
{
#ifdef MMC_SPI_SOFTWARE
MMC_Xfer(0xFF);
#else
char i;
SSPBUF=0xFF;
while (!BF);
i = SSPBUF;
#endif
}
char MMCIn()
{
#ifdef MMC_SPI_SOFTWARE
return MMC_Xfer(0xFF);
#else
char i;
SSPBUF=0xFF;
while (!BF);
i = SSPBUF;
return i;
#endif
}
MMCResponse MMCInit()
{
char response,iii,errcnt;
if (!CardInserted())
return MMC_NO_CARD_INSERTED;
SET_MMC_TRIS(); // Set input/output
// restart_wdt();
MMC_Deselect();
#ifndef MMC_SPI_SOFTWARE
bit_clear(SSPCON1,5); // Disables serial port and configures these pins as I/O port pins
SSPCON1 = 0x30; // modify this number to change SPI clock rate
// Enables serial port and configures SCK, SDO, SDI and SS as serial port pins
// Idle state for clock is a high level
// 0000 = SPI Master mode, clock = FOSC/4
SSPSTAT = 0; // Only bit 6,7 are writable
// 0 = Input data sampled at middle of data output time
// 0 = Transmit occurs on transition from Idle to active clock state
#endif
iii = 10;
errcnt = 100;
do
{
MMCOut(0xFF);
} while (--iii);
delay_us(1000);
MMC_Select(); // if the /CS line of the MMC is low during CMD0,(below), the card enters SPI-mode
MMCOut(0x40); // CMD0
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x95); // CRC
MMC8Clock();
response = MMCIn();
MMC_Deselect();
do
{
delay_us(1000);
//output_low(ChipClk);
MMC_Select();
MMCOut(0x41); // CMD1
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x00);
MMCOut(0x01);
MMC8Clock();
response = MMCIn();
MMC_Deselect();
MMC8Clock();
errcnt--;
} while (response && errcnt);
if(response == 0)
return MMC_OK;
else
return MMC_TIME_OUT;
}
// "Packed" Date:
// +-------+------------+-------+-----+
// | BITS | 15:9 | 8:5 | 4:0 |
// | VALUE |Year – 1980 | Month | Day |
// +-------+------------+-------+-----+
int16 GetCurrentDOSDate()
{
int16 retval;
retval = Time.Year - 1980;
retval <<= 9;
retval |= ((int16)Time.Month << 5);
retval |= (int16)Time.Day;
return retval;
}
// "Packed" Time:
// +-------+-------+--------+----------+
// | BITS | 15:11 | 10:5 | 4:0 |
// | VALUE | Hour | Minute | Second/2 |
// +-------+-------+--------+----------+
int16 GetCurrentDOSTime()
{
int16 retval;
retval = Time.Hour;
retval <<= 11;
retval |= ((int16)Time.Minute << 5);
retval |= (int16)Time.Second >> 1;
return retval;
}
// Function: Reads a sector from MMC
MMCResponse ReadSector(int32 sector, char *hova)
{
char errs,response;
char cnt2,cnt3;
#byte sectorL = sector
#byte sectorH = sector+1
#byte sectorHL = sector+2
if (!CardInserted())
return MMC_NO_CARD_INSERTED;
Disable_interrupts(GLOBAL);
Restart_wdt();
MMCAddressL = 0;
MMCAddressH = sectorL;
MMCAddressHL = sectorH;
MMCAddressHH = sectorHL;
gFAT32Vars.MMCAddress <<= 1;
MMC_Select();
MMCOut(0x51);
MMCOut(MMCAddressHH);
MMCOut(MMCAddressHL);
MMCOut(MMCAddressH & 0xFE);
MMCOut(0);
MMCOut(0x01);
errs = 8;
do
{
response = MMCIn();
} while (--errs && response==0xFF);
errs = 50;
do
{
response = MMCIn();
if (response == 0xFE)
break;
delay_ms(1);
} while (--errs);
FSR0L = (int16)hova; // *0xFE9
cnt3 = 2;
cnt2 = 0;
do
{
do
{
#ifdef MMC_SPI_SOFTWARE
POSTINC0 = MMC_Xfer(0xFF); // *0xFEE
#else
SSPBUF=0xFF; // Writes 0xFF on SPI
while(!BF); // Wait until Transmitted/Received
POSTINC0 = SSPBUF; // Read the received byte and place it in adress oxFEE
#endif
} while (--cnt2);
} while (--cnt3);
response = MMCIn();
response = MMCIn();
MMC_Deselect();
Enable_interrupts(GLOBAL);
return MMC_OK;
}
// Writes a sector to MMC
MMCResponse WriteSector(int32 sector, char *honnan)
{
char errs,response;
char cnt2,cnt3;
#byte sectorL = sector
#byte sectorH = sector+1
#byte sectorHL = sector+2
if (!CardInserted())
return MMC_NO_CARD_INSERTED;
Disable_interrupts(GLOBAL);
Restart_wdt();
MMCAddressL = 0;
MMCAddressH = sectorL;
MMCAddressHL = sectorH;
MMCAddressHH = sectorHL;
gFAT32Vars.MMCAddress <<= 1;
response = 0;
//output_low(ChipClk);
MMC_Select();
MMCOut(0x58);
MMCOut(MMCAddressHH);
MMCOut(MMCAddressHL);
MMCOut(MMCAddressH & 0xFE);
MMCOut(0);
MMCOut(0x01);
MMC8Clock();
errs = 8;
do
{
response = MMCIn();
} while (--errs && response==0xFF);
if (response)
{
MMC_Deselect();
//output_high(ChipClk);
MMC8Clock();
Enable_interrupts(GLOBAL);
return MMC_INVALID_RESPONSE;
}
MMC8Clock();
MMCOut(0xFE);
FSR0L = (int16)honnan; // *0xFE9
cnt3 = 2;
cnt2 = 0;
do
{
do
{ /*
*/
#ifdef MMC_SPI_SOFTWARE
MMC_Xfer(POSTINC0); // *0xFEE
#else
SSPBUF=POSTINC0; // Write the byte on address oxFEE to SPI
while (!BF);
response = SSPBUF; // thanks to wielen
#endif
} while (--cnt2);
} while (--cnt3);
MMCOut(0x00);
MMCOut(0x01);
response = MMCIn();
response ^= 0xE5; // Bitwise exclusive or assignment operator, x^=y, is the same as x=x^y
if (response)
{
goto endwr3;
}
do
{
response = MMCIn();
} while (response == 0);
response = 0;
endwr3:
MMC_Deselect();
//output_high(ChipClk);
MMC8Clock();
Enable_interrupts(GLOBAL);
return MMC_OK;
}
// Function: Initializes the FAT system
void InitFAT()
{
int32 actsector;
char i;
gFirstEmptyCluster = 0;
gFAT32Vars.gStartSector = 0;
ReadSector(gFAT32Vars.gStartSector,gFiles[MAXFILES-1].IOpuffer);
if (gFiles[MAXFILES-1].IOpuffer[0] != 0xEB)
{
gStartSectorL = gFiles[MAXFILES-1].IOpuffer[0x1C6];
gStartSectorH = gFiles[MAXFILES-1].IOpuffer[0x1C7];
gStartSectorHL = gFiles[MAXFILES-1].IOpuffer[0x1C8];
ReadSector(gFAT32Vars.gStartSector,gFiles[MAXFILES-1].IOpuffer);
}
memcpy(&DiskInfo,gFiles[MAXFILES-1].IOpuffer,sizeof(DiskInfo));
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1;
ReadSector(actsector,FATTable);
gFAT32Vars.FATstartidx = 0;
gFAT32Vars.gFirstDataSector = gFAT32Vars.gStartSector + DiskInfo.FATCopies*DiskInfo.hSectorsPerFat+DiskInfo.Reserved1 - 2;
for (i=0;i<MAXFILES;i++)
{
gFiles[i].Free = TRUE;
}
#ifdef ENABLE_FILELISTNG
// Code for initializing file-listing
for(i=0;i<MAX_FILE_LIST;i++)
FileList[i].name = NULL;
changeList = TRUE;
#endif
// MMC_Debug("-FATInit ");
}
int32 GetNextCluster(int32 curcluster)
{
int32 actsector;
int32 clpage;
char clpos;
clpage = curcluster >> 7;
clpos = curcluster & 0x7F;
if (clpage != gFAT32Vars.FATstartidx) // read in the requested page
{
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + clpage;
ReadSector(actsector,FATTable);
gFAT32Vars.FATstartidx = clpage;
}
return (FATTable[clpos]);
}
void SetClusterEntry(int32 curcluster,int32 value)
{
int32 actsector;
int32 clpage;
char clpos;
clpage = curcluster >> 7;
clpos = curcluster & 0x7F;
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + clpage;
if (clpage != gFAT32Vars.FATstartidx)
{
ReadSector(actsector,FATTable);
gFAT32Vars.FATstartidx = clpage;
}
FATTable[clpos] = value;
WriteSector(actsector,FATTable);
actsector += DiskInfo.hSectorsPerFat;
WriteSector(actsector,FATTable);
}
void ClearClusterEntry(int32 curcluster)
{
int32 actsector;
int32 clpage;
char clpos;
clpage = curcluster >> 7;
clpos = curcluster & 0x7F;
if (clpage != gFAT32Vars.FATstartidx)
{
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + gFAT32Vars.FATstartidx;
WriteSector(actsector,FATTable);
actsector += DiskInfo.hSectorsPerFat;
WriteSector(actsector,FATTable);
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + clpage;
ReadSector(actsector,FATTable);
gFAT32Vars.FATstartidx = clpage;
}
FATTable[clpos] = 0;
}
int32 FindFirstFreeCluster()
{
int32 i,st,actsector,retval;
char j;
st = gFirstEmptyCluster;
for (i=st;i<DiskInfo.hSectorsPerFat;i++)
{
if (i != gFAT32Vars.FATstartidx)
{
actsector = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + i;
ReadSector(actsector,FATTable);
gFAT32Vars.FATstartidx = gFirstEmptyCluster = i;
}
for (j=0;j<128;j++)
{
if (FATTable[j] == 0)
{
retval = i;
retval <<= 7;
retval |= j;
return retval;
}
}
}
return 0x0FFFFFFF;
}
// Function: Converts a dir-entry to a 8.3 filename
void ConvertFilename(DIR *beDir,char *name)
{
char i,j,c;
j = 0;
name[0] = 0;
for (i=0;i<8;i++)
{
c = beDir->sName[i];
if (c == ' ')
break;
name[j++] = c;
}
for (i=0;i<3;i++)
{
c = beDir->spam[i];
if (c == ' ' || c == 0)
break;
if (!i)
name[j++] = '.';
name[j++] = c;
}
name[j++] = 0;
}
// Function: Converts a dir-entry to a (part of a) long filename.
// One dir-entry can hold 13 unicode characters
void ConvertLongFilename(DIR *beDir,char *name)
{
char i,j,c;
j = 0;
name[0] = 0;
for (i=1;i<11;i+=2)
{
c = (char)(*(((char*)beDir)+i));
if (c == 0x00 || c == 0xFF)
break;
name[j++] = c;
}
if(c!=0x00 && c!= 0xFF)
{
for (i=14;i<26;i+=2)
{
c = (char)(*(((char*)beDir)+i));;
if (c == 0 || c == 0xFF)
break;
name[j++] = c;
}
if(c!=0x00 && c != 0xFF)
{
for (i=28;i<31;i+=2)
{
c = (char)(*(((char*)beDir)+i));
if (c == 0 || c == 0xFF)
break;
name[j++] = c;
}
}
}
name[j++] = 0;
}
void GetDOSName(DIR *pDir, char *fname)
{
char i,j,leng,c,toext;
toext = FALSE;
j = 0;
leng = strlen(fname);
for (i=0;i<8;i++)
pDir->sName[i] = ' ';
for (i=0;i<3;i++)
pDir->spam[i] = ' ';
for (i=0;i<leng;i++)
{
c = fname[i];
c = toupper(c);
if (c == '.')
{
toext = TRUE;
continue;
}
if (toext)
pDir->spam[j++] = c;
else
pDir->sName[i] = c;
}
}
// Function: Sets the file f to root dir
MMCResponse ReadRootDirectory(char fil)
{
int32 actsector;
if (fil > (MAXFILES-1))
return MMC_INVALID_FILE;
actsector = gFAT32Vars.gStartSector + DiskInfo.FATCopies*DiskInfo.hSectorsPerFat+DiskInfo.Reserved1;
ReadSector(actsector,gFiles[fil].IOpuffer);
gFAT32Vars.gDirEntrySector = actsector;
gFiles[fil].dirSector = actsector;
gFiles[fil].dirIdx = 0;
memcpy(&(gFiles[fil].DirEntry),gFiles[fil].IOpuffer,32);
gFiles[fil].CurrentCluster = DiskInfo.hRootStartCluster;
return MMC_OK;
}
// Funciton: Finds a file
char FindDirEntry(char *fname,char f)
{
DIR *pDir;
int16 i;
char filename[16];
int32 nextcluster,actsector;
if (f > (MAXFILES-1))
{
return FALSE;
}
gFAT32Vars.gFirstEmptyDirEntry = 0xFF;
gFAT32Vars.gFirstDirEntryCluster = 0x0FFFFFFF;
do
{
pDir = (DIR*)(gFiles[f].IOpuffer);
for (i=0;i<DIRENTRYS_PER_SECTOR;i++)
{
if ((pDir->sName[0] == 0xE5 || pDir->sName[0] == 0) && gFAT32Vars.gFirstEmptyDirEntry == 0xFF) // store first free
{
gFAT32Vars.gFirstEmptyDirEntry = i;
gFAT32Vars.gFirstDirEntryCluster = gFiles[f].CurrentCluster;
}
if (pDir->sName[0] == 0)
{
return FALSE;
}
ConvertFilename(pDir,filename);
if (!strcmp(filename,fname))
{
memcpy(&(gFiles[f].DirEntry),pDir,32);
gFiles[f].dirIdx = i;
gFAT32Vars.gDirEntryIdx = i;
return TRUE;
}
pDir++;
}
nextcluster = GetNextCluster(gFiles[f].CurrentCluster);
if (nextcluster != 0x0FFFFFFF && nextcluster != 0)
{
actsector = nextcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFAT32Vars.gDirEntrySector = actsector;
gFiles[f].dirSector = actsector;
gFiles[f].CurrentCluster = nextcluster;
}
} while (nextcluster != 0x0FFFFFFF && nextcluster != 0);
return FALSE;
}
// Function: Assign a filenumber(f) and open the directory
// where the file are and return the filename.
char* TryFile(char *fname, char *f)
{
char i,leng;
char *filename;
*f = 0xFF;
for (i=0;i<MAXFILES;i++)
{
if (gFiles[i].Free)
{
*f = i;
break;
}
}
if (*f == 0xFF)
{
return 0;
}
ReadRootDirectory(*f);
filename = fname;
leng = strlen(fname);
for (i=0;i<leng;i++)
{
if (fname[i] == '/')
{
fname[i] = 0;
if (!cwd(filename,*f))
{
gFiles[*f].Free = TRUE;
return 0;
}
filename = fname+i+1;
}
}
return filename;
}
void strfill(char *dest,char *source,int position)
{
char *d;
for(d=dest+position; *source!=0; d++, source++)
{
*d = *source;
}
}
// Parameters: path, the path to the directory you
// want to view
// Function : Initializes file/dir listing
// Examples:
// strcpy(path,""); // the "path" to the root directory
// f = InitList(path);
// ...
// strcpy(path,"DIR3/DIR32/");
// f = InitList(path);
// if(InitList == MMC_OK)
// {
// res = Listfiles(f);
// CloseList(f);
// }
#ifdef ENABLE_FILELISTNG
MMCResponse InitList(char *path)
{
char f;
if(TryFile(path,&f) == 0)
{
return MMC_NOT_FOUND;
}
gFiles[f].Free = FALSE;
StartList.dirSector = gFiles[f].dirSector;
StartList.CurrentCluster = gFiles[f].CurrentCluster;
StartList.dirIdx = 0;
CurrentList.dirSector = gFiles[f].dirSector;
CurrentList.CurrentCluster = gFiles[f].CurrentCluster;
CurrentList.dirIdx = 0;
return f;
}
// Function: Lists a part (aka page) of the files in the directory
// specified by InitList()
// Returns : The number of files/dirs that were listed
int8 ListFiles(char f)
{
DIR *pDir;
char filename[(CHARACTERS_IN_LONG_FILENAMES+1)]; // should be enough with 13+1
char i,u,fni,len;
BOOLEAN isLongFileName = FALSE;
int32 nextcluster,actsector;
if (f > (MAXFILES-1))
return 0;
if(changeList)
{
FreeList();
}
if((gFiles[f].CurrentCluster != CurrentList.CurrentCluster) || (gFiles[f].dirSector != CurrentList.dirSector))
{
gFiles[f].dirSector = CurrentList.dirSector;
gFiles[f].CurrentCluster = CurrentList.CurrentCluster;
ReadSector(gFiles[f].dirSector,gFiles[f].IOpuffer);
}
gFiles[f].dirIdx = CurrentList.dirIdx;
u=0;
do
{
pDir = (DIR*)(&(gFiles[f].IOpuffer[32*(int16)gFiles[f].dirIdx]));
for (i=gFiles[f].dirIdx;i<DIRENTRYS_PER_SECTOR;i++) // loop throu all direntrys in the sector
{
if ((pDir->sName[0] != 0xE5 && pDir->sName[0] != 0)) // if file/dir isn't deleted and isn't the end of the directory
{
if(pDir->bAttr != 0x0F) // Normal filename (8.3)
{
if(isLongFilename) // If this is the short version of the long filename, just save the number
{
if(changeList)
{
FileList[u].shortName = malloc(13); // 8.3 = 8chars + '.' + 3chars + 0x00
FileList[u].isLong = TRUE;
ConvertFilename(pDir,filename);
strcpy(FileList[u].shortName,filename); // copy the 8.3 name of the file
}
u++;
isLongFilename = FALSE;
if(u == MAX_FILE_LIST)
{
gFiles[f].dirIdx = i+1;
return u;
}
}
else // normal 8.3 filename
{
if(changeList)
{
ConvertFilename(pDir,filename);
FileList[u].name = malloc(strlen(filename)+1); // +1 for char 0x00
strcpy(FileList[u].name,filename);
FileList[u].shortName = FileList[u].name; // point to same string
FileList[u].isLong = FALSE;
if(pDir->bAttr & 0x10) // is directory
FileList[u].isDir = TRUE;
else
FileList[u].isDir = FALSE;
}
u++;
if(u == MAX_FILE_LIST)
{
gFiles[f].dirIdx = i+1;
return u;
}
}
}
else if((pDir->bAttr & 0x0F) == 0x0F) // If it is a long filename entry
{
fni = (pDir->sName[0] & 0x3F); // Filename Index
if((pDir->sName[0] & 0x40)) // First LongFilename entry, the last characters of a long filename
{
if(changeList)
{
ConvertLongFilename(pDir,filename);
len = strlen(filename)+CHARACTERS_IN_LONG_FILENAMES*(fni-1); // Length of the long filename
FileList[u].name = malloc(len+1);// number of chars in this strinng + 13 in each other long filname entry
FileList[u].name[len] = 0x00; // set last char to 0
strfill(FileList[u].name,filename,(fni-1)*CHARACTERS_IN_LONG_FILENAMES); //Fills the name from position (fni-1)*13
if(pDir->bAttr & 0x10) // is directory
FileList[u].isDir = TRUE;
else
FileList[u].isDir = FALSE;
}
isLongFilename = TRUE;
}
else if((pDir->sName[0] & 0x80) == 0) // If it is a long filname, but not deleted
{
if(isLongfilename && changeList)
{
ConvertLongFilename(pDir,filename);
strfill(FileList[u].name,filename,(fni-1)*CHARACTERS_IN_LONG_FILENAMES); //Fills the name from position (fni-1)*13
}
//else
//printf(glcd_putc,"NoLongFileName!");
}
}
}
if (pDir->sName[0] == 0)
{
gFiles[f].dirIdx = END_OF_DIR;
return u;
}
pDir++;
}
nextcluster = GetNextCluster(gFiles[f].CurrentCluster);
if (nextcluster != 0x0FFFFFFF && nextcluster != 0)
{
actsector = nextcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFiles[f].dirSector = actsector;
gFiles[f].CurrentCluster = nextcluster;
gFiles[f].dirIdx = 0;
}
} while (nextcluster != 0x0FFFFFFF && nextcluster != 0);
gFiles[f].dirIdx = END_OF_DIR;
return u;
}
// Function: Go to next page in the file/dir list
// Returns : MMCResponse
MMCResponse NextPage(char f)
{
int32 nextcluster,actsector;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
CurrentList.dirSector = gFiles[f].dirSector;
CurrentList.CurrentCluster = gFiles[f].CurrentCluster;
if(gFiles[f].dirIdx == DIRENTRYS_PER_SECTOR)
{
nextcluster = GetNextCluster(gFiles[f].CurrentCluster);
if (nextcluster != 0x0FFFFFFF && nextcluster != 0)
{
actsector = nextcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
CurrentList.dirSector = actsector;
CurrentList.CurrentCluster = nextcluster;
CurrentList.dirIdx = 0;
return MMC_OK;
}
return MMC_INVALID_CLUSTER;
}
else if(gFiles[f].dirIdx == END_OF_DIR)
{
return MMC_END_OF_DIR; // Last file/dir have already been listed by ListFiles
}
else
{
CurrentList.dirIdx = gFiles[f].dirIdx;
}
return MMC_OK;
}
// Note: 0 = first page
MMCResponse SetPage(char f, int32 page)
{
int32 i;
MMCResponse res;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
CurrentList.dirSector = StartList.dirSector;
CurrentList.CurrentCluster = StartList.CurrentCluster;
CurrentList.dirIdx = StartList.dirIdx; // should always be 0
changeList = FALSE; // this tells the ListFiles function to not change the list, just loop through files
for(i=0;i<page;i++)
{
ListFiles(f);
res = NextPage(f);
if(res != MMC_OK)
{
changeList = TRUE;
return res;
}
}
changeList = TRUE;
return MMC_OK;
}
MMCResponse CloseList(char f)
{
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
gFiles[f].Free = TRUE;
return MMC_OK;
}
void FreeList()
{
int i;
for(i=0;i<MAX_FILE_LIST;i++)
{
if(FileList[i].isLong) // If it is a long filename, name and short name are different string
free(FileList[i].shortName); // then free both
else
FileList[i].shortName = NULL;
free(FileList[i].name); // else free ONLY name(they point to same string..)
}
}
#endif// ENABLE_FILELISTNG
// Function: Creates a file
MMCResponse fcreate(char f,char *fname)
{
DIR *pDir;
int32 actsector,actcl;
int16 i;
if (f > (MAXFILES-1))
{
return MMC_INVALID_FILE;
}
if (gFAT32Vars.gFirstDirEntryCluster == 0x0FFFFFFF)
{
// extend the directory file !!!
gFAT32Vars.gFirstDirEntryCluster = FindFirstFreeCluster();
gFAT32Vars.gFirstEmptyDirEntry = 0;
SetClusterEntry(gFiles[f].CurrentCluster,gFAT32Vars.gFirstDirEntryCluster);
SetClusterEntry(gFAT32Vars.gFirstDirEntryCluster,0x0FFFFFFF);
actsector = gFAT32Vars.gFirstDirEntryCluster + gFAT32Vars.gFirstDataSector;
for (i=0;i<512;i++)
gFiles[f].IOpuffer[i] = 0;
WriteSector(actsector,gFiles[f].IOpuffer);
}
actsector = gFAT32Vars.gFirstDirEntryCluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
pDir = (DIR*)(&(gFiles[f].IOpuffer[32*(int16)gFAT32Vars.gFirstEmptyDirEntry]));
gFiles[f].dirSector = actsector;
gFiles[f].dirIdx = gFAT32Vars.gFirstEmptyDirEntry;
GetDOSName(pDir,fname);
pDir->bAttr = 0;
actcl = FindFirstFreeCluster();
pDir->hCluster = actcl & 0xFFFF;
pDir->hClusterH = actcl >> 16;
SetClusterEntry(actcl,0x0FFFFFFF);
pDir->wSize = 0;
gFiles[f].position = 0;
pDir->hDate = GetCurrentDOSDate();
pDir->hTime = GetCurrentDOSTime();
WriteSector(actsector,gFiles[f].IOpuffer);
memcpy(&(gFiles[f].DirEntry),pDir,32);
return MMC_OK;
}
int32 ComposeCluster(char f)
{
int32 retval;
retval = gFiles[f].DirEntry.hClusterH;
retval <<= 16;
retval |= gFiles[f].DirEntry.hCluster;
return retval;
}
// Function: Opens a file with the specified mode
// Returns : A file handle or error code
MMCResponse fopen(char *fname, char mode)
{
char found;
char f;
int32 actsector,actcluster,nextcluster;
char *filename;
if (!CardInserted())
return MMC_NO_CARD_INSERTED;
filename = TryFile(fname,&f);
if (filename == 0)
{
return MMC_NOT_FOUND; // probebly invalid directory
}
found = FALSE;
found = FindDirEntry(filename,f);
if (!found)
{
if (mode == 'r')
{
gFiles[f].Free = TRUE;
return MMC_NOT_FOUND;
}
else
{
if (fcreate(f,filename) != MMC_OK)
return MMC_NOT_FOUND;
found = TRUE;
}
}
if (found)
{
gFiles[f].Free = FALSE;
gFiles[f].mode = mode;
if (mode == 'a')
{
gFiles[f].position = gFiles[f].DirEntry.wSize;
actcluster = ComposeCluster(f);
while (actcluster != 0x0FFFFFFF && nextcluster != 0)
{
nextcluster = GetNextCluster(actcluster);
if (nextcluster == 0x0FFFFFFF || nextcluster == 0)
break;
actcluster = nextcluster;
}
actsector = actcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFiles[f].CurrentCluster = actcluster;
gFiles[f].posinsector = gFiles[f].position & 0x01FF;
if (gFiles[f].posinsector == 0 && gFiles[f].position != 0)
gFiles[f].posinsector = 512;
}
else
{
gFiles[f].position = 0;
actsector = ComposeCluster(f);
actsector += gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFiles[f].CurrentCluster = ComposeCluster(f);
gFiles[f].posinsector = 0;
}
}
return f;
}
// Function: closes a open file and makes it avavible for a new file
MMCResponse fclose(char f)
{
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
if ((gFiles[f].mode == 'a') || (gFiles[f].mode == 'w'))
fflush(f);
gFiles[f].Free = TRUE;
return MMC_OK;
}
// Function: writes the chach to the MMC
MMCResponse fflush(char f)
{
int32 actsector;
DIR *pDir;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
actsector = gFiles[f].CurrentCluster + gFAT32Vars.gFirstDataSector;
WriteSector(actsector,gFiles[f].IOpuffer);
ReadSector(gFiles[f].dirSector,gFiles[f].IOpuffer);
pDir = (DIR*)(&(gFiles[f].IOpuffer[32*gFiles[f].dirIdx]));
if (gFiles[f].DirEntry.bAttr & 0x10) // if it is a directory
pDir->wSize = 0;
else
pDir->wSize = gFiles[f].position;
pDir->hDate = GetCurrentDOSDate();
pDir->hTime = GetCurrentDOSTime();
WriteSector(gFiles[f].dirSector,gFiles[f].IOpuffer);
ReadSector(actsector,gFiles[f].IOpuffer);
return MMC_OK;
}
// Function: Enter a specified directory
char cwd(char *fname, char f)
{
int32 actsector;
if (f > (MAXFILES-1))
{
return FALSE; // just in case of overaddressing
}
if (IsSelfDir(fname))
{
return TRUE; // already in Root dir
}
if (!FindDirEntry(fname,f))
{
return FALSE; // not found
}
actsector = ComposeCluster(f);
actsector += gFAT32Vars.gFirstDataSector; // read current dir
ReadSector(actsector,gFiles[f].IOpuffer);
gFAT32Vars.gDirEntrySector = actsector;
gFiles[f].dirSector = actsector;
gFiles[f].CurrentCluster = ComposeCluster(f);
return TRUE;
}
// Function: Put a char to the open file
MMCResponse fputch(char be, char f)
{
int32 nextcluster,actsector;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
if (gFiles[f].posinsector == 512)
{
actsector = gFiles[f].CurrentCluster + gFAT32Vars.gFirstDataSector;
WriteSector(actsector,gFiles[f].IOpuffer);
nextcluster = FindFirstFreeCluster();
if (nextcluster != 0x0FFFFFFF && nextcluster != 0)
{
SetClusterEntry(gFiles[f].CurrentCluster,nextcluster);
SetClusterEntry(nextcluster,0x0FFFFFFF);
actsector = nextcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFiles[f].CurrentCluster = nextcluster;
gFiles[f].posinsector = 0;
}
}
gFiles[f].IOpuffer[gFiles[f].posinsector] = be;
gFiles[f].posinsector++;
gFiles[f].position++;
return MMC_OK;
}
// Function: Puts a string to the open file
MMCResponse fputstring(char *be, char f)
{
int16 leng,i;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
leng = strlen(be);
for (i=0;i<leng;i++)
fputch(be[i],f);
return MMC_OK;
}
// Function: Read a buffer from the open file
int16 fread(char *buffer, int16 leng, char f)
{
int16 i,retv;
char c,v;
if (f > (MAXFILES-1))
return 0;
retv = 0;
for (i=0;i<leng;i++)
{
v = fgetch(&c,f);
if (v == MMC_OK)
{
buffer[i] = c;
retv++;
}
else
break;
}
return retv;
}
// Function: Write a buffer to the open file
MMCResponse fwrite(char *buffer, int16 leng, char f)
{
int16 i;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
for (i=0;i<leng;i++)
fputch(buffer[i],f);
return MMC_OK;
}
// Function: Read a char from the open file
MMCResponse fgetch(char *ki,char f)
{
int32 nextcluster,actsector;
if (f > (MAXFILES-1))
return MMC_INVALID_FILE;
if (gFiles[f].position >= gFiles[f].DirEntry.wSize)
return MMC_INVALID_POSITION;
*ki = gFiles[f].IOpuffer[gFiles[f].posinsector];
gFiles[f].posinsector++;
gFiles[f].position++;
if (gFiles[f].posinsector == 512)
{
nextcluster = GetNextCluster(gFiles[f].CurrentCluster);
if (nextcluster != 0x0FFFFFFF && nextcluster != 0)
{
actsector = nextcluster + gFAT32Vars.gFirstDataSector;
ReadSector(actsector,gFiles[f].IOpuffer);
gFiles[f].CurrentCluster = nextcluster;
gFiles[f].posinsector = 0;
}
}
return MMC_OK;
}
// Function: Removes a file
MMCResponse remove(char *fname)
{
char i,found;
char f;
DIR *pDir;
int32 nextcluster,currentcluster;
char *filename;
filename = TryFile(fname,&f);
if (filename == 0)
return MMC_NOT_FOUND;
found = FindDirEntry(filename,f);
if (!found)
{
gFiles[f].Free = TRUE;
return MMC_NOT_FOUND;
}
pDir = (DIR*)(&(gFiles[f].IOpuffer[32*(int16)gFAT32Vars.gDirEntryIdx]));
pDir->sName[0] = 0xE5;
for (i=1;i<8;i++)
pDir->sName[i] = ' ';
for (i=0;i<3;i++)
pDir->spam[i] = ' ';
WriteSector(gFAT32Vars.gDirEntrySector,gFiles[f].IOpuffer);
currentcluster = ComposeCluster(f);
while (currentcluster != 0x0FFFFFFF && nextcluster != 0)
{
nextcluster = GetNextCluster(currentcluster);
ClearClusterEntry(currentcluster);
currentcluster = nextcluster;
}
ClearClusterEntry(currentcluster);
SetClusterEntry(currentcluster,0);
currentcluster = gFAT32Vars.gStartSector+DiskInfo.Reserved1 + gFAT32Vars.FATstartidx;
WriteSector(currentcluster,FATTable);
currentcluster += DiskInfo.hSectorsPerFat;
WriteSector(currentcluster,FATTable);
gFiles[f].Free = TRUE;
return MMC_OK;
}
// Function: Gets the size of a file
MMCResponse getfsize(char *fname, int32 *fsiz)
{
char found;
char f;
DIR *pDir;
char *filename;
filename = TryFile(fname,&f);
if (filename == 0)
return MMC_NOT_FOUND;
found = FindDirEntry(filename,f);
if (!found)
{
gFiles[f].Free = TRUE;
return MMC_NOT_FOUND;
}
pDir = (DIR*)(&(gFiles[f].IOpuffer[32*(Int16)gFAT32Vars.gDirEntryIdx]));
gFiles[f].Free = TRUE;
*fsiz = pDir->wSize;
return MMC_OK;
} |
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zamzam23
Joined: 25 Aug 2010
Posts: 47
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| Posted: Wed Nov 14, 2018 11:30 am |
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I have solved equal array size way.
char msg[25]="";
char textt[25]=""; |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Thu Nov 15, 2018 1:27 am |
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I started reading before seeing your reply:
char textt[]="";
Allocates just one byte of RAM to hold textt. You then start writing to it. It'll actually be causing problem after anything more than one byte is written to it, but it obviously is not overwriting anything that visibly causes problems till you write your tenth character.....
Even at 25 characters it is really too small. Your float numbers could be values like 999999. or even be so large they end up switching to exponential format, so something like 9.99999E18. Each could therefore need 11 characters of space in the output. You have a leading "\n\r", so another two characters, and you then have a text sequence (you show 12 subsequent characters), so you could potentially need 36 characters (plus another space for the terminating null).
It very much depends on the size of the float values, but you need to ensure that there is space in the output for every character that may occur, or _something_ will be being overwritten.... |
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