在STM32WLE5CCU6官网发出的I2C官方例程中怎么修改成用I2C2控制CHTA30IW来读取温湿度
时间: 2024-03-12 22:44:12 浏览: 63
首先,需要在STM32WLE5CCU6上初始化I2C2,并将其连接到CHTA30IW。然后,可以使用以下代码来读取温湿度数据:
```c
#include "stm32_w1xx_hal.h"
#define CHTA30_I2C_ADDRESS 0x80
#define CHTA30_TEMPERATURE_REG 0x00
#define CHTA30_HUMIDITY_REG 0x01
I2C_HandleTypeDef hi2c2;
void CHTA30_ReadTempHumidity(float *temperature, float *humidity)
{
uint8_t data[4];
uint16_t raw_temp, raw_humidity;
// Send temperature measurement command
data[0] = CHTA30_TEMPERATURE_REG;
HAL_I2C_Master_Transmit(&hi2c2, CHTA30_I2C_ADDRESS, data, 1, HAL_MAX_DELAY);
// Wait for measurement to complete
HAL_Delay(50);
// Read temperature data
HAL_I2C_Master_Receive(&hi2c2, CHTA30_I2C_ADDRESS, data, 2, HAL_MAX_DELAY);
raw_temp = (data[0] << 8) | data[1];
*temperature = ((float)raw_temp / 65536.0) * 165.0 - 40.0;
// Send humidity measurement command
data[0] = CHTA30_HUMIDITY_REG;
HAL_I2C_Master_Transmit(&hi2c2, CHTA30_I2C_ADDRESS, data, 1, HAL_MAX_DELAY);
// Wait for measurement to complete
HAL_Delay(50);
// Read humidity data
HAL_I2C_Master_Receive(&hi2c2, CHTA30_I2C_ADDRESS, data, 2, HAL_MAX_DELAY);
raw_humidity = (data[0] << 8) | data[1];
*humidity = ((float)raw_humidity / 65536.0) * 100.0;
}
```
该函数将读取温度和湿度数据,并将其存储在传递给函数的指针中。请注意,此代码假定I2C2已正确初始化,并且其速率已设置为100kHz。如果您需要更改这些设置,请在代码中进行相应更改。
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