41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
#include "ens.h"
|
|
|
|
#include "hardware/i2c.h"
|
|
#include "pico/stdlib.h" // IWYU pragma: keep
|
|
|
|
static const uint8_t ENS_ACTIVATE[2] = {0x10, 0x02};
|
|
static const uint8_t ENS_IDLE[2] = {0x10, 0x01};
|
|
|
|
void activateENS(i2c_inst_t *i2c) {
|
|
i2c_write_blocking(i2c, ENS_ADDR, ENS_ACTIVATE, 2, false);
|
|
return;
|
|
}
|
|
void deactivateENS(i2c_inst_t *i2c) {
|
|
i2c_write_blocking(i2c, ENS_ADDR, ENS_IDLE, 2, false);
|
|
return;
|
|
}
|
|
uint8_t getENSData(i2c_inst_t *i2c, double *t, double *h, uint8_t *AQI, uint16_t *TVOC,
|
|
uint16_t *ECO2, uint16_t *ETOH) {
|
|
uint16_t K = (uint16_t)((*t + 273.15) * 64.0); // convert to ENS format
|
|
uint16_t RH = (uint16_t)(*h * 512.0);
|
|
uint8_t inputData[5] = {0x13, (uint8_t)(K & 0x00FF), (uint8_t)(K >> 8),
|
|
(uint8_t)(RH & 0x00FF), (uint8_t)(RH >> 8)};
|
|
uint8_t result[7];
|
|
uint8_t dataReg = ENS_AQI;
|
|
uint8_t valid;
|
|
i2c_write_blocking(i2c, ENS_ADDR, inputData, 5, false);
|
|
sleep_ms(100);
|
|
i2c_write_blocking(i2c, ENS_ADDR, &dataReg, 1, true);
|
|
i2c_read_blocking(i2c, ENS_ADDR, result, 7, false);
|
|
*AQI = result[0];
|
|
*TVOC = (result[2] << 8) | result[1];
|
|
*ECO2 = (result[4] << 8) | result[3];
|
|
*ETOH = (result[6] << 8) | result[5];
|
|
dataReg = 0x20; // status register
|
|
i2c_write_blocking(i2c, ENS_ADDR, &dataReg, 1, true);
|
|
i2c_read_blocking(i2c, ENS_ADDR, result, 1, false);
|
|
valid = (result[0] & ENS_STATUS_MASK) == 0
|
|
? 1
|
|
: 0; // check if we are in warm-up or normal mode
|
|
return valid;
|
|
}
|