[经验]

【道生物联TKB-620开发板试用】采集温湿度上报

2025-4-18 15:06:28

406 道生物联

【前言】
我提交的计划为冷链监控系统，因此采集温湿度是首要步骤。这篇将分享如何采集sht30并实现手动上报数据，在接收端打印出接收到的数据。
【硬件】
1、TKB-620开发板*2
2、sht30温湿度计
【实现步骤】
1、查找开发板的原理图，获取IIC的接口，从厂家提供的原理图中，有温湿度计的接口J14：

他的接口为PB10（I2C_SCL)、PB11（I2C_SDA)。
由于没有焊接转接坐，因此需要自己焊好插座。
2、在keil工程中添加sht3x.c/h文件并且将其添加到工程中：

sht3x.c的源代码如下：

#include "stm32f10x.h"
#include <stdio.h>

// ??I2C??
#define SHT30_I2C_SCL_PIN GPIO_Pin_10
#define SHT30_I2C_SDA_PIN GPIO_Pin_11
#define SHT30_I2C_GPIO_PORT GPIOB
#define SHT30_I2C RCC_APB1Periph_I2C2

// ??SHT30??
#define SHT30_ADDR 0x44 << 1

// ???I2C
void SHT30_I2C_Init(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;

    // ??GPIO?I2C??
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(SHT30_I2C, ENABLE);

    // ??I2C??
    GPIO_InitStructure.GPIO_Pin = SHT30_I2C_SCL_PIN | SHT30_I2C_SDA_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(SHT30_I2C_GPIO_PORT, &GPIO_InitStructure);

    // ??I2C
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 400000;
    I2C_Init(I2C2, &I2C_InitStructure);

    // ??I2C
    I2C_Cmd(I2C2, ENABLE);
}

// ?SHT30????
void SHT30_SendCommand(uint8_t cmd[2]) {
    while (I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C2, ENABLE);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, SHT30_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C2, cmd[0]);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_SendData(I2C2, cmd[1]);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTOP(I2C2, ENABLE);
}

// ?SHT30????
void SHT30_ReadData(uint8_t *data, uint8_t length) {
    while (I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C2, ENABLE);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, SHT30_ADDR, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    for (uint8_t i = 0; i < length; i++) {
        if (i == length - 1) {
            I2C_AcknowledgeConfig(I2C2, DISABLE);
        }
        while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED));
        data[i] = I2C_ReceiveData(I2C2);
    }

    I2C_AcknowledgeConfig(I2C2, ENABLE);
    I2C_GenerateSTOP(I2C2, ENABLE);
}

// ??SHT30??????
void SHT30_ReadTemperatureAndHumidity(float *temperature, float *humidity) {
    uint8_t cmd[2] = {0x2C, 0x06};
    uint8_t data[6];

    SHT30_SendCommand(cmd);
    // ????????
    for (volatile uint32_t i = 0; i < 100000; i++);

    SHT30_ReadData(data, 6);

    uint16_t rawTemp = (data[0] << 8) | data[1];
    uint16_t rawHumidity = (data[3] << 8) | data[4];

    *temperature = -45 + (175 * (float)rawTemp / 65535);
    *humidity = 100 * (float)rawHumidity / 65535;
}

sht3x.h主要是开放sht3x的初始以及读取数据的函数：

#ifndef __SHT3X_H__
#define __SHT3X_H__

void SHT30_I2C_Init(void);
void SHT30_ReadTemperatureAndHumidity(float *temperature, float *humidity);

#endif

3、添加测试信息，我将读取函数放到按键发送的函数中，他在user.c的RF_SendDataOnce中，修改后的发送函数如下：

void RF_SendDataOnce(void)
{
	float temperature, humidity;
    char cmd[50];
		SHT30_ReadTemperatureAndHumidity(&temperature, &humidity);
    printf("Temperature: %.2f C, Humidity: %.2f %%\n", temperature, humidity);
    sys_param.txSentCnt++;
//	sprintf(cmd, "AT+SENDB=0001020304%04x\r\n", sys_param.txSentCnt);
	sprintf(cmd, "AT+SENDB=000100%02d%02d%02d%02d\r\n", (int)temperature,((int)(temperature*100))%100,(int)humidity,((int)(humidity*100))%100);
	Send_AtCmd(cmd);
}