Mercurial > mbsePi-apps / file comparison
comparison: thermferm/devices.c
thermferm/devices.c
- changeset 649
- 64cfc01ec024
- parent 648
- 62c5ed1b9cfd
- child 650
- 0b215e4b814e
equal
deleted
inserted
replaced
| 648:62c5ed1b9cfd | 649:64cfc01ec024 |
|---|---|
| 75 fd = open(dhtpath, O_RDONLY); | 75 fd = open(dhtpath, O_RDONLY); |
| 76 if (fd < 0) { | 76 if (fd < 0) { |
| 77 /* | 77 /* |
| 78 * The sensor is gone. | 78 * The sensor is gone. |
| 79 */ | 79 */ |
| 80 err = errno; | |
| 81 syslog(LOG_NOTICE, "DHT11 open temperature: %d %s", err, strerror(err)); | |
| 80 free(dhtpath); | 82 free(dhtpath); |
| 81 dht11_state = DEVPRESENT_NO; | 83 dht11_state = DEVPRESENT_NO; |
| 82 break; | 84 goto retry; |
| 85 // break; | |
| 83 } | 86 } |
| 84 rc = read(fd, buffer, 25); | 87 rc = read(fd, buffer, 25); |
| 85 if (rc == -1) { | 88 if (rc == -1) { |
| 86 err = errno; | 89 err = errno; |
| 87 if (err == 110) { | 90 if (err == 110) { |
| 92 } | 95 } |
| 93 syslog(LOG_NOTICE, "DHT11 read temperature: %d %s", err, strerror(err)); | 96 syslog(LOG_NOTICE, "DHT11 read temperature: %d %s", err, strerror(err)); |
| 94 dht11_temperature = -1; | 97 dht11_temperature = -1; |
| 95 } else { | 98 } else { |
| 96 sscanf(buffer, "%d", &temp); | 99 sscanf(buffer, "%d", &temp); |
| 97 syslog(LOG_NOTICE, "read temp rc=%d %f", rc, temp / 1000.0); | |
| 98 dht11_temperature = temp; | 100 dht11_temperature = temp; |
| 99 dht11_state = DEVPRESENT_YES; | 101 dht11_state = DEVPRESENT_YES; |
| 100 } | 102 } |
| 101 close(fd); | 103 close(fd); |
| 102 free(dhtpath); | 104 free(dhtpath); |
| 122 } | 124 } |
| 123 syslog(LOG_NOTICE, "DHT11 read temperature: %d %s", err, strerror(err)); | 125 syslog(LOG_NOTICE, "DHT11 read temperature: %d %s", err, strerror(err)); |
| 124 dht11_humidity = -1; | 126 dht11_humidity = -1; |
| 125 } else { | 127 } else { |
| 126 sscanf(buffer, "%d", &hum); | 128 sscanf(buffer, "%d", &hum); |
| 127 syslog(LOG_NOTICE, "read hum rc=%d %f", rc, hum / 1000.0); | |
| 128 dht11_humidity = hum; | 129 dht11_humidity = hum; |
| 129 dht11_state = DEVPRESENT_YES; | 130 dht11_state = DEVPRESENT_YES; |
| 130 } | 131 } |
| 131 close(fd); | 132 close(fd); |
| 132 free(dhtpath); | 133 free(dhtpath); |
| 134 } | 135 } |
| 135 | 136 |
| 136 if (dht11_state == DEVPRESENT_YES) { | 137 if (dht11_state == DEVPRESENT_YES) { |
| 137 break; | 138 break; |
| 138 } | 139 } |
| 139 if (tries > 0) | 140 retry: |
| 141 if (tries > 0) { | |
| 140 tries--; | 142 tries--; |
| 143 usleep(400000); | |
| 144 } | |
| 141 } | 145 } |
| 142 | 146 |
| 143 syslog(LOG_NOTICE, "dht11 t:%d h:%d tries:%d state:%d", dht11_temperature, dht11_humidity, 6-tries, dht11_state); | 147 syslog(LOG_NOTICE, "dht11 t:%d h:%d tries:%d state:%d", dht11_temperature, dht11_humidity, 6-tries, dht11_state); |
| 144 } | 148 } |
| 145 | 149 |
