250 lines
6.8 KiB
C
250 lines
6.8 KiB
C
/*
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* SHT40 温湿度传感器驱动
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* 功能：通过I2C1读取SHT40传感器的温湿度数据
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* 依赖：STM32 HAL库
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* 跨平台：仅适用于STM32F4系列，使用HAL库的I2C接口
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*/
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#include "sht40.h"
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#include "board.h"
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#include "osal.h"
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#include "hal.h"
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/* 硬件抽象层操作结构体 */
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const hal_ops_t *hal_ops = NULL;
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/* CRC校验函数 */
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static uint8_t sht40_crc8(const uint8_t *data, uint8_t len)
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{
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const uint8_t POLYNOMIAL = 0x31;
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uint8_t crc = 0xFF;
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for (uint8_t i = 0; i < len; i++)
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{
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crc ^= data[i];
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for (uint8_t j = 0; j < 8; j++)
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{
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if (crc & 0x80)
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{
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crc = (crc << 1) ^ POLYNOMIAL;
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}
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else
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{
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crc <<= 1;
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}
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}
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}
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return crc;
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}
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/**
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* @brief 初始化SHT40传感器
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* @return 0成功，-1失败
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*/
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int sht40_init(void)
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{
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/* 初始化硬件抽象层操作结构体 */
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hal_ops = hal_get_ops();
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if (hal_ops == NULL)
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{
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osal_log_e("SHT40: Failed to get HAL ops");
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return -1;
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}
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return sht40_reset();
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}
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/**
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* @brief 重置SHT40传感器
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* @return 0成功，-1失败
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*/
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int sht40_reset(void)
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{
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uint8_t cmd = SHT40_CMD_RESET;
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osal_log_i("SHT40: Sending reset command 0x%02X", cmd);
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if (hal_ops->i2c->master_transmit(SHT40_I2C_ADDR << 1, &cmd, 1, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 reset failed");
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return -1;
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}
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osal_thread_mdelay(1); // 重置需要<1ms
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osal_log_i("SHT40: Reset successful");
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return 0;
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}
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/**
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* @brief 读取SHT40传感器的序列号
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* @param serial 序列号（4字节）
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* @return 0成功，-1失败
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*/
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int sht40_read_serial(uint32_t *serial)
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{
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uint8_t cmd = SHT40_CMD_READ_SERIAL;
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uint8_t data[6];
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//osal_log_i("SHT40: Sending read serial command 0x%02X", cmd);
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if (hal_ops->i2c->master_transmit(SHT40_I2C_ADDR << 1, &cmd, 1, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 send read serial command failed");
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return -1;
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}
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osal_thread_mdelay(1);
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if (hal_ops->i2c->master_receive(SHT40_I2C_ADDR << 1, data, 6, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 read serial data failed");
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return -1;
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}
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/* 校验数据 */
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if (sht40_crc8(&data[0], 2) != data[2])
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{
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osal_log_e("SHT40 serial CRC error (bytes 0-2)");
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return -1;
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}
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if (sht40_crc8(&data[3], 2) != data[5])
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{
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osal_log_e("SHT40 serial CRC error (bytes 3-5)");
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return -1;
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}
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*serial = (uint32_t)(data[0] << 24) | (data[1] << 16) | (data[3] << 8) | data[4];
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//osal_log_i("SHT40: Serial number: 0x%08X", *serial);
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return 0;
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}
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/**
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* @brief 开启SHT40传感器的加热器
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* @param power_level 功率级别：0=低功率(20mW), 1=中功率(110mW), 2=高功率(200mW)
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* @return 0成功，-1失败
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*/
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int sht40_heater_enable(uint8_t power_level)
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{
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uint8_t cmd;
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switch (power_level)
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{
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case 0:
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cmd = SHT40_CMD_HEATER_LOW;
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//osal_log_i("SHT40: Enabling heater (low power, 20mW)");
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break;
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case 1:
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cmd = SHT40_CMD_HEATER_MED;
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//osal_log_i("SHT40: Enabling heater (medium power, 110mW)");
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break;
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case 2:
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cmd = SHT40_CMD_HEATER_HIGH;
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//osal_log_i("SHT40: Enabling heater (high power, 200mW)");
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break;
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default:
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osal_log_e("SHT40: Invalid heater power level");
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return -1;
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}
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if (hal_ops->i2c->master_transmit(SHT40_I2C_ADDR << 1, &cmd, 1, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 heater enable failed");
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return -1;
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}
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osal_thread_mdelay(1000); // 加热器持续1秒
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//osal_log_i("SHT40: Heater operation completed");
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return 0;
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}
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/**
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* @brief 读取SHT40传感器的温湿度数据（支持不同精度）
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* @param temperature 温度值（摄氏度）
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* @param humidity 湿度值（百分比）
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* @param precision 精度级别：0=低精度, 1=中精度, 2=高精度
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* @return 0成功，-1失败
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*/
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int sht40_read_temperature_humidity_with_precision(float *temperature, float *humidity, uint8_t precision)
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{
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uint8_t cmd;
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uint16_t delay_ms;
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switch (precision)
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{
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case 0:
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cmd = SHT40_CMD_MEASURE_LOW_PRECISION;
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delay_ms = 2; // 1.8ms
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//osal_log_i("SHT40: Using low precision measurement");
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break;
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case 1:
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cmd = SHT40_CMD_MEASURE_MED_PRECISION;
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delay_ms = 5; // 4.5ms
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//osal_log_i("SHT40: Using medium precision measurement");
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break;
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case 2:
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default:
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cmd = SHT40_CMD_MEASURE_HIGH_PRECISION;
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delay_ms = 10; // 8.2ms
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//osal_log_i("SHT40: Using high precision measurement");
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break;
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}
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uint8_t data[6];
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//osal_log_i("SHT40: Sending measure command 0x%02X to address 0x%02X", cmd, SHT40_I2C_ADDR);
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/* 发送测量命令 */
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if (hal_ops->i2c->master_transmit(SHT40_I2C_ADDR << 1, &cmd, 1, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 send measure command failed");
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return -1;
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}
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//osal_log_i("SHT40: Measure command sent successfully");
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/* 等待测量完成 */
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osal_thread_mdelay(delay_ms);
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/* 读取测量结果 */
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//osal_log_i("SHT40: Reading 6 bytes of data");
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if (hal_ops->i2c->master_receive(SHT40_I2C_ADDR << 1, data, 6, 1000) != HAL_STATUS_OK)
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{
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osal_log_e("SHT40 read data failed");
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return -1;
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}
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//osal_log_i("SHT40: Data read successfully: 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X",
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// data[0], data[1], data[2], data[3], data[4], data[5]);
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/* 校验温度数据 */
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if (sht40_crc8(&data[0], 2) != data[2])
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{
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osal_log_e("SHT40 temperature CRC error");
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return -1;
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}
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/* 校验湿度数据 */
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if (sht40_crc8(&data[3], 2) != data[5])
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{
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osal_log_e("SHT40 humidity CRC error");
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return -1;
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}
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/* 计算温度值 */
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uint16_t temp_raw = (data[0] << 8) | data[1];
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*temperature = -45.0f + 175.0f * (float)temp_raw / 65535.0f;
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/* 计算湿度值 */
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uint16_t hum_raw = (data[3] << 8) | data[4];
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*humidity = -6.0f + 125.0f * (float)hum_raw / 65535.0f;
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/* 湿度值范围限制 */
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if (*humidity < 0.0f) *humidity = 0.0f;
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if (*humidity > 100.0f) *humidity = 100.0f;
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return 0;
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}
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/**
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* @brief 读取SHT40传感器的温湿度数据（默认高精度）
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* @param temperature 温度值（摄氏度）
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* @param humidity 湿度值（百分比）
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* @return 0成功，-1失败
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*/
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int sht40_read_temperature_humidity(float *temperature, float *humidity)
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{
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return sht40_read_temperature_humidity_with_precision(temperature, humidity, 2); // 默认使用高精度
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} |