*/
#include <stdlib.h>
+#include <stdint.h>
#include <math.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#define LOG_PREFIX "ut372"
-char lookup[] = {
+uint8_t lookup[] = {
0x7B,
0x60,
0x5E,
#define DECIMAL_POINT_MASK 0x80
+/* Decode a pair of characters into a byte. */
+static uint8_t decode_pair(const uint8_t *buf)
+{
+ unsigned int i;
+ char hex[3];
+
+ hex[2] = '\0';
+
+ for (i = 0; i < 2; i++) {
+ hex[i] = buf[i];
+ if (hex[i] > 0x39)
+ hex[i] += 7;
+ }
+
+ return strtol(hex, NULL, 16);
+}
+
SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
{
return (buf[25] == '\r' && buf[26] == '\n');
SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
struct sr_datafeed_analog *analog, void *info)
{
- unsigned int i, j, segments, value, divisor;
- char hex[3];
+ unsigned int i, j, value, divisor;
+ uint8_t segments;
(void) info;
- hex[2] = '\0';
value = 0;
divisor = 1;
for (i = 0; i < 5; i++) {
- for (j = 0; j < 2; j++) {
- hex[j] = buf[2*i + 1 + j];
- if (hex[j] > 0x39)
- hex[j] += 7;
- }
- segments = strtol(hex, NULL, 16);
+ segments = decode_pair(buf + 1 + 2*i);
for (j = 0; j < ARRAY_SIZE(lookup); j++) {
if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
value += j * pow(10, i);