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drivers: add driver for CCS811 gas sensor

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Schorcht 2018-10-01 09:04:31 +02:00 committed by Alexandre Abadie
parent 74e1ab220c
commit 98af7d3d62
1 changed files with 21 additions and 22 deletions
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43
drivers/ccs811/ccs811_saul.c
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@ -23,45 +23,44 @@
#include "ccs811.h"
static uint16_t _iaq_tvoc = 0;
static uint16_t _iaq_eco2 = 0;
static bool _data_ready = false;
static int read(const ccs811_t *dev)
static int read(const ccs811_t *dev, uint16_t *iaq_tvoc, uint16_t *iaq_eco2)
{
/* check whether new data can be read */
int res = ccs811_data_ready((ccs811_t *)dev);
if (res != CCS811_OK) {
return res;
if (!_data_ready) {
/* if no data were ready yet, test for new data */
if (ccs811_data_ready((ccs811_t *)dev) == CCS811_OK) {
_data_ready = true;
}
else {
return -ECANCELED;
}
}
/* read new data and save them to local storage */
return ccs811_read_iaq((ccs811_t *)dev, &_iaq_tvoc, &_iaq_eco2, 0, 0);
int res = ccs811_read_iaq((ccs811_t *)dev, iaq_tvoc, iaq_eco2, NULL, NULL);
/* in case of CCS811_ERROR_NO_NEW_DATA last valid data are returned */
return (res == CCS811_OK ||
res == -CCS811_ERROR_NO_NEW_DATA) ? 0 : -ECANCELED;
}
static int read_tvoc(const void *dev, phydat_t *res)
{
/* read new data if available */
read(dev);
/* fill data from local storage */
res->val[0] = _iaq_tvoc;
if (read(dev, (uint16_t*)&res->val[0], NULL) != 0) {
return -ECANCELED;
}
res->unit = UNIT_PPB;
res->scale = 0;
return 1;
}
static int read_eco2(const void *dev, phydat_t *res)
{
/* read new data if available */
read(dev);
/* fill data from local storage */
res->val[0] = _iaq_eco2;
if (read(dev, NULL, (uint16_t*)&res->val[0]) != 0) {
return -ECANCELED;
}
res->unit = UNIT_PPM;
res->scale = 0;
return 1;
}