alexey.zholtikov/zh_dht
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Alexey Zholtikov
2024-06-22 16:37:08 +03:00
parent 3d7987b803
commit 8c3d60d8fd
2 changed files with 108 additions and 12 deletions
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5
README.md
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@ -77,10 +77,11 @@ void app_main(void)
i2c_master_bus_handle_t i2c_bus_handle;
i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
zh_dht_init_config_t zh_dht_init_config = ZH_DHT_INIT_CONFIG_DEFAULT();
#endif
#ifdef CONFIG_IDF_TARGET_ESP8266
zh_bh1750_init_config.i2c_port = I2C_PORT;
zh_dht_init_config.i2c_port = I2C_PORT;
#else
zh_bh1750_init_config.i2c_handle = i2c_bus_handle;
zh_dht_init_config.i2c_handle = i2c_bus_handle;
#endif
zh_dht_init(&zh_dht_init_config);
float humidity = 0.0;

115
zh_dht.c
View File

@ -1,12 +1,14 @@
#include "zh_dht.h"
#define BIT_1_TRANSFER_MAX_DURATION 75 // Signal "1" high time.
#define BIT_0_TRANSFER_MAX_DURATION 30 // Signal "0" high time.
#define DATA_BIT_START_TRANSFER_MAX_DURATION 55 // Signal "0", "1" low time.
#define RESPONSE_MAX_DURATION 85 // Response to low time. Response to high time.
#define MASTER_RELEASE_MAX_DURATION 200 // Bus master has released time.
#define DATA_SIZE 40 // Sensor data size for 1-wire connection.
#define I2C_ADDRESS 100 // Sensor address size for I2C connection.
#define BIT_1_TRANSFER_MAX_DURATION 75 // Signal "1" high time for 1-wire connection.
#define BIT_0_TRANSFER_MAX_DURATION 30 // Signal "0" high time for 1-wire connection.
#define DATA_BIT_START_TRANSFER_MAX_DURATION 55 // Signal "0", "1" low time for 1-wire connection.
#define RESPONSE_MAX_DURATION 85 // Response to low time. Response to high time. For 1-wire connection.
#define MASTER_RELEASE_MAX_DURATION 200 // Bus master has released time for 1-wire connection.
#define ONE_WIRE_DATA_SIZE 40 // Sensor data size for 1-wire connection (in bits).
#define I2C_DATA_SIZE 8 // Sensor data size for I2C connection (in bytes).
#define I2C_ADDRESS 0x5C // Sensor address for I2C connection.
#define I2C_DATA_READ_COMMAND 0x03, 0x00, 0x04 // Command for read sensor data (temperature and humidity) for I2C connection.
#ifdef CONFIG_IDF_TARGET_ESP8266
#define esp_delay_us(x) os_delay_us(x)
@ -23,6 +25,7 @@ static i2c_master_dev_handle_t _dht_handle = {0};
static const char *TAG = "zh_dht";
static esp_err_t _read_bit(bool *bit);
static uint16_t _calc_crc(const uint8_t *buf, size_t len);
esp_err_t zh_dht_init(const zh_dht_init_config_t *config)
{
@ -50,7 +53,20 @@ esp_err_t zh_dht_init(const zh_dht_init_config_t *config)
}
else
{
// I2C.
#ifndef CONFIG_IDF_TARGET_ESP8266
i2c_device_config_t dht_config = {
.dev_addr_length = I2C_ADDR_BIT_LEN_7,
.device_address = I2C_ADDRESS,
.scl_speed_hz = 100000,
};
i2c_master_bus_add_device(_init_config.i2c_handle, &dht_config, &_dht_handle);
if (i2c_master_probe(_init_config.i2c_handle, I2C_ADDRESS, 1000 / portTICK_PERIOD_MS) != ESP_OK)
{
ESP_LOGE(TAG, "DHT initialization fail. Sensor not connected or not responded.");
return ESP_ERR_NOT_FOUND;
}
ESP_LOGI(TAG, "DHT initialization success. I2C connection.");
#endif
}
_is_initialized = true;
return ESP_OK;
@ -114,10 +130,10 @@ esp_err_t zh_dht_read(float *humidity, float *temperature)
++time;
esp_delay_us(1);
}
uint8_t dht_data[DATA_SIZE / 8] = {0};
uint8_t dht_data[ONE_WIRE_DATA_SIZE / 8] = {0};
uint8_t byte_index = 0;
uint8_t bit_index = 7;
for (uint8_t i = 0; i < 40; ++i)
for (uint8_t i = 0; i < ONE_WIRE_DATA_SIZE; ++i)
{
bool bit = 0;
if (_read_bit(&bit) != ESP_OK)
@ -148,6 +164,63 @@ esp_err_t zh_dht_read(float *humidity, float *temperature)
*temperature *= -1;
}
}
else
{
esp_err_t esp_err = ESP_OK;
uint8_t dht_data[I2C_DATA_SIZE] = {0};
uint8_t read_command[] = {I2C_DATA_READ_COMMAND};
uint8_t wakeup_command = {0};
#ifdef CONFIG_IDF_TARGET_ESP8266
// i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
// i2c_master_start(i2c_cmd_handle);
// i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
// i2c_master_write_byte(i2c_cmd_handle, _command, true);
// i2c_master_stop(i2c_cmd_handle);
// esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
// i2c_cmd_link_delete(i2c_cmd_handle);
#else
esp_err = i2c_master_transmit(_dht_handle, &wakeup_command, sizeof(wakeup_command), 1000 / portTICK_PERIOD_MS);
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "DHT read fail. I2C driver error.");
return esp_err;
}
esp_err = i2c_master_transmit(_dht_handle, read_command, sizeof(read_command), 1000 / portTICK_PERIOD_MS);
#endif
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "DHT read fail. I2C driver error.");
return esp_err;
}
#ifdef CONFIG_IDF_TARGET_ESP8266
// i2c_cmd_handle = i2c_cmd_link_create();
// i2c_master_start(i2c_cmd_handle);
// i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_READ, true);
// i2c_master_read_byte(i2c_cmd_handle, &sensor_data[0], I2C_MASTER_ACK);
// i2c_master_read_byte(i2c_cmd_handle, &sensor_data[1], I2C_MASTER_NACK);
// i2c_master_stop(i2c_cmd_handle);
// esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
// i2c_cmd_link_delete(i2c_cmd_handle);
#else
esp_err = i2c_master_receive(_dht_handle, dht_data, sizeof(dht_data), 1000 / portTICK_PERIOD_MS);
#endif
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "DHT read fail. I2C driver error.");
return esp_err;
}
if (_calc_crc(dht_data, I2C_DATA_SIZE - 2) != (dht_data[7] << 8 | dht_data[6]))
{
ESP_LOGE(TAG, "DHT read fail. Invalid CRC.");
return ESP_ERR_INVALID_CRC;
}
*humidity = (dht_data[2] << 8 | dht_data[3]) / 10.0;
*temperature = ((dht_data[4] & 0x7F) << 8 | dht_data[5]) / 10.0;
if ((dht_data[4] & 0x80) != 0)
{
*temperature *= -1;
}
}
ESP_LOGI(TAG, "DHT read success.");
return ESP_OK;
}
@ -176,4 +249,26 @@ static esp_err_t _read_bit(bool *bit)
}
*bit = (time > BIT_0_TRANSFER_MAX_DURATION) ? 1 : 0;
return ESP_OK;
}
static uint16_t _calc_crc(const uint8_t *buf, size_t len)
{
uint16_t crc = 0xFFFF;
while (len--)
{
crc ^= (uint16_t)*buf++;
for (unsigned i = 0; i < 8; i++)
{
if (crc & 0x0001)
{
crc >>= 1;
crc ^= 0xA001;
}
else
{
crc >>= 1;
}
}
}
return crc;
}