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16F877 Problem - passing string data

 
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robinaspey



Joined: 01 Oct 2008
Posts: 4
Location: England (for time being)

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16F877 Problem - passing string data
PostPosted: Tue Nov 25, 2008 7:28 am     Reply with quote
I'm having a problem with sending some sample data to test a microcontroller - the data is passed via a 16F877 and the
character strings dont get passed from the sample data array.

Here is the code.

Code:
/***********************************/
/* PROGRAM    SIMULATE STREAM        */
/***********************************/
#include    <16F877.h>
#device    ICD=TRUE
#device   PASS_STRINGS=IN_RAM
#fuses      HS, NOWDT, BROWNOUT, NOPROTECT, PUT
#use    delay(clock=20000000)
#use    rs232(BAUD=9600, XMIT=PIN_C6, RCV=PIN_C7, STREAM=SIMOUT, ERRORS)

#define RED_LED      PIN_D0            
// Placing strings in ROM
#define   MAXDATA      23

typedef   unsigned int UINT8   ;

// Heres the test data
const char *sdata[]=  {      "00:24:35 0980200,",
                  "00:24:37 0980000,",
                  "00:24:53 0980000,",
                  "555555  ,",
                  "00:26:16 0980200,",
                  "00:27:16 0980200,",
                  "00:28:16 0980200,",
                  "4523    ,",
                  "00:29:28 0980380,",
                  "00:30:28 0980200,",
                  "00:31:28 0980200,",
                  "00:32:28 0980200," 
                  "00:33:28 0980200,",
                  "00:34:28 0980200,",
                  "00:35:28 0980200,",
                  "00:36:28 0980200,",
                  "00:37:28 0980200,",
                  "00:38:28 0980200,",
                  "00:39:28 0980200,",
                  "00:40:28 0980300,",
                  "00:41:28 0980300,",
                  "00:42:28 0980200,",
                  "00:43:28 0980200,"    };
void main(void)
{   
UINT8 counter = 0;
fprintf(SIMOUT, "\r\nSTARTING TELEMETRY SIM.\r\n");      
fprintf(SIMOUT, "Sending test data in 1 second ..........\r\n");
delay_ms(1000);
while(TRUE)   {   
   fprintf(SIMOUT, "String: %s", sdata[counter++]);
   delay_ms(600);
   if (counter >= 22) counter = 0;
   output_toggle(RED_LED);
   delay_ms(1000);
   }
}

_________________
Thanks in advance ...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Nov 25, 2008 2:12 pm     Reply with quote
In the 16F PICs (with the PCM compiler), there is a limit of 256 bytes
per 'const' array. If you break up the array into two pieces, then it
works. Example:
Code:
#include <16F877.h>
#device *=16
#device PASS_STRINGS=IN_RAM
#fuses HS, NOWDT, BROWNOUT, NOPROTECT, PUT
#use delay(clock=20000000)
#use rs232(BAUD=9600, XMIT=PIN_C6, RCV=PIN_C7, ERRORS)


char const sdata_1[14][18]=
 {
                  "00:24:35 0980200,",
                  "00:24:37 0980000,",
                  "00:24:53 0980000,",
                  "555555          ,"  ,
                  "00:26:16 0980200,",
                  "00:27:16 0980200,",
                  "00:28:16 0980200,",
                  "4523            ,",
                  "00:29:28 0980380,",
                  "00:30:28 0980200,",
                  "00:31:28 0980200,",
                  "00:32:28 0980200,", 
                  "00:33:28 0980200,",
                  "00:34:28 0980200,"
};                 

char const sdata_2[9][18]=
 {
                  "00:35:28 0980200,",
                  "00:36:28 0980200,",
                  "00:37:28 0980200,",
                  "00:38:28 0980200,",
                  "00:39:28 0980200,",
                  "00:40:28 0980300,",
                  "00:41:28 0980300,",
                  "00:42:28 0980200,",
                  "00:43:28 0980200,"   
 
};


void main(void)
{   
int8 i;
printf("Start\n\r");
for(i = 0; i < 14; i++)
    printf("%s\n\r", sdata_1[i]);

for(i = 0; i < 9; i++)
    printf("%s\n\r", sdata_2[i]);


}
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