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Minor changes in CCS811 driver (#542)

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This commit is contained in:
Gunar Schorcht 2018-01-20 13:02:31 +01:00 committed by Ruslan V. Uss
parent 37230b2de6
commit 8325bb87c5
3 changed files with 11 additions and 3 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 the 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");
} }
``` ```

6
extras/ccs811/ccs811.c
View file

@ -494,7 +494,8 @@ static bool ccs811_reg_read(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, ui
} }
# ifdef CCS811_DEBUG_LEVEL_2 # ifdef CCS811_DEBUG_LEVEL_2
printf("CCS811 %s: Read following bytes: ", __FUNCTION__); printf("CCS811 %s: bus %d, addr %02x - Read following bytes: ",
__FUNCTION__, dev->bus, dev->addr);
printf("%0x: ", reg); printf("%0x: ", reg);
for (int i=0; i < len; i++) for (int i=0; i < len; i++)
printf("%0x ", data[i]); printf("%0x ", data[i]);
@ -514,7 +515,8 @@ static bool ccs811_reg_write(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, u
# ifdef CCS811_DEBUG_LEVEL_2 # ifdef CCS811_DEBUG_LEVEL_2
if (data && len) if (data && len)
{ {
printf("CCS811 %s: Write following bytes starting at reg addr %02x: ", __FUNCTION__, reg); printf("CCS811 %s: bus %d, addr %02x - Write following bytes: ",
__FUNCTION__, dev->bus, dev->addr);
for (int i=0; i < len; i++) for (int i=0; i < len; i++)
printf("%02x ", data[i]); printf("%02x ", data[i]);
printf("\n"); printf("\n");