diff options
| -rw-r--r-- | ao-tools/lib/cc-telemetry.c | 30 | ||||
| -rw-r--r-- | ao-tools/lib/cc-telemetry.h | 12 |
2 files changed, 42 insertions, 0 deletions
diff --git a/ao-tools/lib/cc-telemetry.c b/ao-tools/lib/cc-telemetry.c index 99da2680..88da7f03 100644 --- a/ao-tools/lib/cc-telemetry.c +++ b/ao-tools/lib/cc-telemetry.c @@ -60,3 +60,33 @@ cc_telemetry_parse(const char *input_line, union ao_telemetry_all *telemetry) memcpy(telemetry, hex+1, 34); return TRUE; } + +uint8_t +cc_telemetry_cksum(const union ao_telemetry_all *telemetry) +{ + const uint8_t *x = (const uint8_t *) telemetry; + int i; + uint8_t sum = 0x5a; + for (i = 0; i < 34; i++) + sum += x[i]; + return sum; +} + +void +cc_telemetry_unparse(const union ao_telemetry_all *telemetry, char output_line[CC_TELEMETRY_BUFSIZE]) +{ + uint8_t hex[36]; + int i; + int p; + + hex[0] = 34; + memcpy(hex+1, telemetry, 34); + hex[35] = cc_telemetry_cksum(telemetry); + strcpy(output_line, "TELEM "); + p = strlen(output_line); + for (i = 0; i < 36; i++) { + sprintf(output_line + p, "%02x", hex[i]); + p += 2; + } +} + diff --git a/ao-tools/lib/cc-telemetry.h b/ao-tools/lib/cc-telemetry.h index e849cd3b..9a5be49f 100644 --- a/ao-tools/lib/cc-telemetry.h +++ b/ao-tools/lib/cc-telemetry.h @@ -237,7 +237,19 @@ union ao_telemetry_all { struct ao_telemetry_baro baro; }; +#define CC_TELEMETRY_HEADER "TELEM" + +/* "TELEM " 1 byte length 32 data bytes 1 rssi 1 status 1 checksum 1 null */ + +#define CC_TELEMETRY_BUFSIZE (6 + (1 + 32 + 3) * 2 + 1) + int cc_telemetry_parse(const char *input_line, union ao_telemetry_all *telemetry); +uint8_t +cc_telemetry_cksum(const union ao_telemetry_all *telemetry); + +void +cc_telemetry_unparse(const union ao_telemetry_all *telemetry, char output_line[CC_TELEMETRY_BUFSIZE]); + #endif |