#define MAX_CANFRAME "12345678#01.23.45.67.89.AB.CD.EF"
#define MAX_LONG_CANFRAME "12345678 [8] 10101010 10101010 10101010 10101010 10101010 10101010 10101010 10101010 '........'"
-static int asc2nibble(char c) {
+unsigned char asc2nibble(char c) {
if ((c >= '0') && (c <= '9'))
return c - '0';
return 16; /* error */
}
+int hexstring2candata(char *arg, struct can_frame *cf) {
+
+ int len = strlen(arg);
+ int i;
+ unsigned char tmp;
+
+ if (!len || len%2 || len > 16)
+ return 1;
+
+ for (i=0; i < len/2; i++) {
+
+ tmp = asc2nibble(*(arg+(2*i)));
+ if (tmp > 0x0F)
+ return 1;
+
+ cf->data[i] = (tmp << 4);
+
+ tmp = asc2nibble(*(arg+(2*i)+1));
+ if (tmp > 0x0F)
+ return 1;
+
+ cf->data[i] |= tmp;
+ }
+
+ return 0;
+}
+
int parse_canframe(char *cs, struct can_frame *cf) {
/* documentation see lib.h */
- int i, idx, dlc, len, tmp;
+ int i, idx, dlc, len;
+ unsigned char tmp;
len = strlen(cs);
//printf("'%s' len %d\n", cs, len);
*
*/
+unsigned char asc2nibble(char c);
+/*
+ * Returns the decimal value of a given ASCII hex character.
+ *
+ * While 0..9, a..f, A..F are valid ASCII hex characters.
+ * On invalid characters the value 16 is returned for error handling.
+ */
+
+int hexstring2candata(char *arg, struct can_frame *cf);
+/*
+ * Converts a given ASCII hex string to values in the can_frame data[].
+ *
+ * A valid ASCII hex string consists of and even number of up to 16 chars.
+ * Leading zeros '00' in the ASCII hex string are interpreted.
+ *
+ * Examples:
+ *
+ * "1234" => data[0] = 0x12, data[1] = 0x34
+ * "001234" => data[0] = 0x00, data[1] = 0x12, data[2] = 0x34
+ *
+ * Return values:
+ * 0 = success
+ * 1 = error (in length or the given characters are no ASCII hex characters)
+ *
+ * Remark: The not written data[] elements remain unchanged.
+ *
+ */
+
int parse_canframe(char *cs, struct can_frame *cf);
/*
* Transfers a valid ASCII string decribing a CAN frame into struct can_frame.