102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
#include "hardware/gpio.h"
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#include "hardware/i2c.h"
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#include "pico/cyw43_arch.h"
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#include "pico/stdlib.h"
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#include <boards/pico_w.h>
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#include <hardware/structs/io_bank0.h>
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#include <pico/binary_info/code.h>
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#include <pico/double.h>
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#include <stdio.h>
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#define AHT_ADDR 0x38
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#define ENS_ADDR 0x53
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uint8_t AHT_MEASURE[3] = {0xAC, 0x33, 0x00};
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uint8_t ENS_ACTIVATE[2] = {0x10, 0x02};
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uint8_t ENS_IDLE[2] = {0x10, 0x01};
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#define ENS_TEMP_IN 0x13
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#define ENS_HUM_IN 0x15
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#define ENS_STATUS 0x20
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#define ENS_STATUS_MASK 0x0C
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#define ENS_AQI 0x21
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#define ENS_TVOC 0x22
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#define ENS_ECO2 0x24
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#define ENS_ETOH 0x26
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void getAHTData(double *t, double *h) {
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uint8_t result[6];
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uint32_t temperature, humidity;
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i2c_write_blocking(i2c_default, AHT_ADDR, AHT_MEASURE, 3,
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false); // trigger measurement
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// now we must delay ~100ms
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sleep_ms(100);
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i2c_read_blocking(i2c_default, AHT_ADDR, result, 6,
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false); // read 6 bytes back
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humidity = (result[1] << 12) | (result[2] << 4) | (result[3] & 0xF0) >> 4;
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temperature = (result[3] & 0x0F) << 16 | (result[4] << 8) | result[5];
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*t = ((double)temperature / 1048576.0f) * 200.0f - 50.0f;
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*h = ((double)humidity / 1048576.0f) * 100.0f;
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return;
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}
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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; // 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], dataReg = ENS_AQI, valid;
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i2c_write_blocking(i2c_default, ENS_ADDR, inputData, 5, false);
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activateENS();
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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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printf("Status register is 0x%0X\n", result[0]);
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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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// deactivateENS();
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return valid;
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}
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int main() {
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uint16_t tvoc, eco2, etoh;
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uint8_t aqi, validData;
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double t, h;
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stdio_init_all();
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i2c_init(i2c_default, 100 * 1000); // start i2c at 100khz
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gpio_set_function(PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C);
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gpio_set_function(PICO_DEFAULT_I2C_SDA_PIN, GPIO_FUNC_I2C);
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gpio_pull_up(PICO_DEFAULT_I2C_SCL_PIN);
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gpio_pull_up(PICO_DEFAULT_I2C_SDA_PIN);
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bi_decl(bi_2pins_with_func(PICO_DEFAULT_I2C_SDA_PIN, PICO_DEFAULT_I2C_SCL_PIN,
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GPIO_FUNC_I2C));
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while (1) {
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getAHTData(&t, &h);
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printf("Temperature %f Humidity %f\n", t, h);
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validData = getENSData(&t, &h, &aqi, &tvoc, &eco2, &etoh);
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if (!validData) {
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printf("ENS Data not yet valid\n");
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}
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printf("AQI: %d TVOC: %d eCO2: %d EtOH: %d\n", aqi, tvoc, eco2, etoh);
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sleep_ms(2000);
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}
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return 0;
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}
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