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alyeomans
Joined: 26 Feb 2014
Posts: 24
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| Trouble converting parsed string to INT16 |
 Posted: Tue Jul 05, 2016 6:02 am |
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Hi All
I'm hoping for some comment on trying to find where I have messed this program. This test program accepts serial input and parses out separate strings from comma delimiters. My trouble has appeared when converting the string to int16 - the char array outputs ok as a string but fails as an int16. See following test program and test output:
| Code: | #include <18F4620.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdlibm.h>
//FUSES
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC //Internal RC Osc, with CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT
#FUSES NOPUT //No Power Up Timer
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage programming
#FUSES NOWRT //Program memory not write protected
#FUSES CCP2B3 //CCP2 output on RB3 and not RC1
#FUSES MCLR //Master Clear pin enabled
#define TX PIN_C6
#define RX PIN_C7
#use delay(clock=8000000)
#use RS232 (BAUD = 9600, XMIT = TX, RCV = RX, STREAM = COM_A, ERRORS)
//outputs binary from int16
void printBint16(int16 b){
int8 i;
for (i = 15; i > 0; i--) {
if(i==8) printf(" ");
if(bit_test(b, i-1))
printf("1");
else
printf("0");
}
}
void main(void) {
char strCommand[100];
int8 wordCount=0;
char *ch;
char *stpChar="\r\n";
char *strCmd[12];
char tok[]=",";
//print ready prompt
printf("TEST START");
printf("->");
//receive command
gets(strCommand);
//remove trialing new line char
strCommand[strcspn(strCommand, stpChar)] = 0;
//split in string into seperate vars
ch = strtok(strCommand, tok);
strCmd[wordCount]=(char*)malloc(strlen(ch) + 1);
strcpy(strCmd[wordCount],ch);
while (ch != NULL) {
wordCount++;
//printf("%s ", ch);
ch = strtok(NULL, tok);
strCmd[wordCount]=malloc(strlen(ch) + 1);
strcpy(strCmd[wordCount],ch);
}
switch(strCmd[0]) {
case "s":
//check if 2nd value parsed
if(wordCount>=1){
int16 atoi_val;
printf("string val= %s\r\n",strCmd[1]);
printf("size_of=%d\r\n",sizeof(strCmd[1]));
printf("binary of strCmd[1]=");
printBint16(strCmd[1]);
printf("\r\n");
atoi_val=atoi(strCmd[1]);
printf("atoi_val=%lu\r\n",atoi_val);
printf("binary of atoi_val=");
printBint16(atoi_val);
printf("\r\n");
}
else printf("s error");
break;
default:
printf("unknown command\r\n");
}
free(strCmd);
while(1);
} //end main |
| Code: | input "s,512"[cr]
TEST START->string val= 512
string val= 512
size_of=2
binary of strCmd[1]=0000000 10111001
atoi_val=0
binary of atoi_val=0000000 00000000
input "s,1023"[cr]
TEST START->string val= 1023
size_of=2
binary of strCmd[1]=0000000 10111011
atoi_val=255
binary of atoi_val=0000000 11111111 |
_________________
I type therefore I press buttons |
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alyeomans
Joined: 26 Feb 2014
Posts: 24
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| Posted: Tue Jul 05, 2016 6:25 am |
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Solved. atoi() is for 8 bit and atol() for long integers - works ok for int16 not sure of higher.
Al
_________________
I type therefore I press buttons |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19359
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| Posted: Tue Jul 05, 2016 8:21 am |
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If you look in stdlib, you will find the code for atol. Immediately followed by the code for atoi32. Solves the 32bit problem. 
There is also code there for PCD only, giving atoi48 and atoi64. |
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