41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
#include "ens.h"
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#include "hardware/i2c.h"
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#include "pico/stdlib.h"
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static const uint8_t ENS_ACTIVATE[2] = {0x10, 0x02};
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static const uint8_t ENS_IDLE[2] = {0x10, 0x01};
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void activateENS(void) {
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i2c_write_blocking(i2c_default, ENS_ADDR, ENS_ACTIVATE, 2, false);
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return;
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}
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void deactivateENS(void) {
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i2c_write_blocking(i2c_default, ENS_ADDR, ENS_IDLE, 2, false);
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return;
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}
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uint8_t getENSData(double *t, double *h, uint8_t *AQI, uint16_t *TVOC,
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uint16_t *ECO2, uint16_t *ETOH) {
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uint16_t K = (uint16_t)((*t + 273.15) * 64.0); // convert to ENS format
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uint16_t RH = (uint16_t)*h * 512;
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uint8_t inputData[5] = {0x13, (uint8_t)(K & 0x00FF), (uint8_t)(K >> 8),
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(uint8_t)(RH & 0x00FF), (uint8_t)(RH >> 8)};
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uint8_t result[7];
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uint8_t dataReg = ENS_AQI;
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uint8_t valid;
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i2c_write_blocking(i2c_default, ENS_ADDR, inputData, 5, false);
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sleep_ms(100);
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i2c_write_blocking(i2c_default, ENS_ADDR, &dataReg, 1, true);
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i2c_read_blocking(i2c_default, ENS_ADDR, result, 7, false);
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*AQI = result[0];
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*TVOC = (result[2] << 8) | result[1];
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*ECO2 = (result[4] << 8) | result[3];
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*ETOH = (result[6] << 8) | result[5];
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dataReg = 0x20; // status register
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i2c_write_blocking(i2c_default, ENS_ADDR, &dataReg, 1, true);
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i2c_read_blocking(i2c_default, ENS_ADDR, result, 1, false);
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valid = (result[0] & ENS_STATUS_MASK) == 0
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? 1
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: 0; // check if we are in warm-up or normal mode
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return valid;
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}
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