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minor changes

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This commit is contained in:
Gunar Schorcht 2018-01-06 15:32:19 +01:00
parent 45b00bd957
commit b43588cf8c
2 changed files with 7 additions and 1 deletions
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2
examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
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@ -174,5 +174,7 @@ void user_init(void)
// start periodic measurement with one measurement per second // start periodic measurement with one measurement per second
ccs811_set_mode (sensor, ccs811_mode_1s); ccs811_set_mode (sensor, ccs811_mode_1s);
} }
else
printf("Could not initialize CCS811 sensor\n");
} }

6
extras/ccs811/README.md
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@ -305,12 +305,14 @@ ccs811_set_mode (sensor, ccs811_mode_1s);
... ...
``` ```
Last, the user task that uses the sensor has to be created. Finally, a user task that uses the sensor has to be created.
``` ```
xTaskCreate(user_task, "user_task", 256, NULL, 2, 0); xTaskCreate(user_task, "user_task", 256, NULL, 2, 0);
``` ```
**Please note:** To avoid concurrency situations when driver functions are used to access the sensor, for example to read data, the user task must not be created until the sensor configuration is completed.
The user task can use different approaches to fetch new data. Either new data are fetched periodically or the interrupt signal *nINT* is used when new data are available or eCO2 value exceeds defined thresholds. The user task can use different approaches to fetch new data. Either new data are fetched periodically or the interrupt signal *nINT* is used when new data are available or eCO2 value exceeds defined thresholds.
If new data are fetched **periodically** the implementation of the user task is quite simply and could look like following. If new data are fetched **periodically** the implementation of the user task is quite simply and could look like following.
@ -564,6 +566,8 @@ void user_init(void)
// start periodic measurement with one measurement per second // start periodic measurement with one measurement per second
ccs811_set_mode (sensor, ccs811_mode_1s); ccs811_set_mode (sensor, ccs811_mode_1s);
} }
else
printf("Could not initialize CCS811 sensor\n");
} }
``` ```