87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
#include "ccs811.h"
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i2c_device_config_t CCS811_DEV_CFG = {
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.dev_addr_length = I2C_ADDR_BIT_LEN_7,
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.device_address = CCS811_ADDRESS,
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.scl_speed_hz = 100000,
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};
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i2c_master_dev_handle_t CCS811_DEV_HANDLE;
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esp_err_t ccs811_getStatus()
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{
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uint8_t errorID;
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uint8_t status;
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uint8_t hardwareVersion;
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uint16_t version;
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uint16_t bootVersion;
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esp_err_t ret = i2c_read_register_8(CCS811_DEV_HANDLE, CCS811_REG_STATUS, &status);
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if (ret != ESP_OK) {return ret;}
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ret = i2c_read_register_16(CCS811_DEV_HANDLE, CCS811_REG_FW_APP_VERSION, &version);
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if (ret != ESP_OK) {return ret;}
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ret = i2c_read_register_16(CCS811_DEV_HANDLE, CCS811_REG_FW_BOOT_VERSION, &bootVersion);
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if (ret != ESP_OK) {return ret;}
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ret = i2c_read_register_8(CCS811_DEV_HANDLE, CCS811_REG_HW_VERSION, &hardwareVersion);
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if (ret != ESP_OK) {return ret;}
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ret = i2c_read_register_8(CCS811_DEV_HANDLE, CCS811_REG_ERROR_ID, &errorID);
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ESP_LOGW(TAG_CCS, "CCS811 status: %d, version: %d, boot version: %d, hardware version: %d, error ID: %d", status, version, bootVersion, hardwareVersion, errorID);
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return ret;
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}
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esp_err_t ccs811_init()
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{
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esp_err_t ret =i2c_master_bus_add_device(i2c0_bus_hdl, &CCS811_DEV_CFG, &CCS811_DEV_HANDLE);
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if (ret != ESP_OK) {return ret;}
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vTaskDelay(10 / portTICK_PERIOD_MS);
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uint8_t reset_seq[4] = {0x11, 0xE5, 0x72, 0x8A};
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ret = i2c_write_register(CCS811_DEV_HANDLE, CCS811_REG_SW_RESET, reset_seq, sizeof(reset_seq)); // Reset
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if (ret != ESP_OK) {return ret;}
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vTaskDelay(10 / portTICK_PERIOD_MS);
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ret = ccs811_getStatus();
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if (ret != ESP_OK) {return ret;}
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ret = i2c_write_register(CCS811_DEV_HANDLE, CCS811_REG_APP_START, NULL, 0); // start
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if (ret != ESP_OK) {return ret;}
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vTaskDelay(10 / portTICK_PERIOD_MS);
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ret = i2c_write_register_8(CCS811_DEV_HANDLE, CCS811_REG_MEAS_MODE, 0x40); // MODE 1 interrupts vypnuté
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if (ret != ESP_OK) {return ret;}
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ret = ccs811_getStatus();
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return ret;
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}
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esp_err_t ccs811_get_data(uint16_t *eCO2, uint16_t *tvoc, uint8_t *current, uint16_t *rawData)
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{
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uint8_t algResultData[8];
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esp_err_t ret = i2c_read_register(CCS811_DEV_HANDLE, CCS811_REG_ALG_RESULT_DATA, algResultData, 8);
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if (ret == ESP_OK)
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{
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*eCO2 = ((uint16_t)algResultData[0] << 8) | algResultData[1];
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*tvoc = ((uint16_t)algResultData[2] << 8) | algResultData[3];
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*current = algResultData[6] >> 2;
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*rawData = ((uint16_t)(algResultData[6] & 0x03) << 8) | algResultData[7];
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ESP_LOGI(TAG_CCS, "CCS Status: %d, Error: %d", algResultData[4], algResultData[5]);
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return ESP_OK;
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}
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return ret;
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}
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esp_err_t ccs811_set_env_data(float temperature, float humidity)
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{
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uint8_t envData[4];
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// Convert humidity: %RH × 512 (rounding)
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uint16_t hum_conv = (uint16_t)(humidity * 512.0f + 0.5f);
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envData[0] = (hum_conv >> 8) & 0xFF;
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envData[1] = hum_conv & 0xFF;
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// Convert temperature: (°C + 25) × 512
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uint16_t temp_conv = (uint16_t)((temperature + 25.0f) * 512.0f + 0.5f);
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envData[2] = (temp_conv >> 8) & 0xFF;
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envData[3] = temp_conv & 0xFF;
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return i2c_write_register(CCS811_DEV_HANDLE, CCS811_REG_ENV_DATA, envData, 4);
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}
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