【Ai-M61-32SU入门】I2C读取DHTC12温湿度

DHTC12是一款数字温湿度传感器，采用I2C通讯，性能特征如下



照例先放上驱动文件 my_dhtc12.rar (2.78 KB, 下载次数: 4)

2024-5-26 10:42 上传

点击文件名下载附件
使用方法：
I2C的初始化和驱动OLED时一样

1. void i2c_init()
   
2. {
   
3.     gpio = bflb_device_get_by_name("gpio");
   
4.     /* I2C0_SDA */
   
5.     bflb_gpio_init(gpio, GPIO_PIN_11, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
   
6.     /* I2C0_SCL */
   
7.     bflb_gpio_init(gpio, GPIO_PIN_10, GPIO_FUNC_I2C0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);
   
8. 
   
9.     i2c0 = bflb_device_get_by_name("i2c0");
   
10. 
    
11.     bflb_i2c_init(i2c0, 100000);
    
12. }

复制代码

实现发送和接收方法

1. uint8_t i2c_sendreg(void *i2cx,uint8_t devaddr,uint8_t *reg,uint8_t reglen,uint8_t *datas,uint16_t datalen)
   
2. {
   
3.     struct bflb_i2c_msg_s msgs[2];
   
4.     msgs[0].addr = devaddr;
   
5.     msgs[0].flags = I2C_M_NOSTOP;
   
6.     msgs[0].buffer = reg;
   
7.     msgs[0].length = reglen;
   
8. 
   
9.     msgs[1].addr = devaddr;
   
10.     msgs[1].flags = I2C_M_WRITE;
    
11.     msgs[1].buffer = datas;
    
12.     msgs[1].length = datalen;
    
13.     if(reglen > 0)
    
14.         return bflb_i2c_transfer(i2cx, msgs, 2) == 0?0:1;
    
15.     else
    
16.         return bflb_i2c_transfer(i2cx, &msgs[1], 1) == 0?0:1;
    
17. }
    
18. 
    
19. uint8_t i2c_readreg(void *i2cx,uint8_t devaddr,uint8_t *reg,uint8_t reglen,uint8_t *datas,uint16_t datalen)
    
20. {
    
21.     struct bflb_i2c_msg_s msgs[2];
    
22. 
    
23.     msgs[0].addr = devaddr;
    
24.     msgs[0].flags = I2C_M_NOSTOP;
    
25.     msgs[0].buffer = reg;
    
26.     msgs[0].length = reglen;
    
27. 
    
28.     msgs[1].addr = devaddr;
    
29.     msgs[1].flags = I2C_M_READ;
    
30.     msgs[1].buffer = datas;
    
31.     msgs[1].length = datalen;
    
32.     if(reglen > 0)
    
33.         return bflb_i2c_transfer(i2cx, msgs, 2) == 0?0:1;
    
34.     else
    
35.         return bflb_i2c_transfer(i2cx, &msgs[1], 1) == 0?0:1;
    
36. }

复制代码

初始化DHTC12

1. MY_DHTC12_DEV_Type dhtc12_dev;
   
2. void dhtc12_init()
   
3. {
   
4.     dhtc12_dev.i2cx = i2c0;
   
5.     dhtc12_dev.i2c_readregdatas_func = i2c_readreg;
   
6.     dhtc12_dev.i2c_sendregdatas_func = i2c_sendreg;
   
7.     dhtc12_dev.delayms_func = bflb_mtimer_delay_ms;
   
8.     MY_DHTC12_Init(&dhtc12_dev);
   
9. }

复制代码

main函数

1. int main(void)
   
2. {
   
3.     int16_t tem,hum;
   
4.     board_init();
   
5.     gpio = bflb_device_get_by_name("gpio");
   
6.     bflb_gpio_init(gpio, GPIO_PIN_12, GPIO_OUTPUT | GPIO_FLOAT | GPIO_SMT_EN | GPIO_DRV_0);
   
7.     i2c_init();
   
8.     dhtc12_init();
   
9.     while (1) {
   
10.         bflb_gpio_set(gpio, GPIO_PIN_12);
    
11.         bflb_mtimer_delay_ms(1000);
    
12.         bflb_gpio_reset(gpio, GPIO_PIN_12);
    
13.         bflb_mtimer_delay_ms(1000);
    
14.         if(MY_DHTC12_ReadHT(&dhtc12_dev,&tem,&hum) == 0)
    
15.             printf("温度：%.1f℃  湿度：%.1f%%\r\n",tem/10.0,hum/10.0);
    
16.     }
    
17. }

复制代码

运行效果
、

配合上之前的OLED就能实现一个数字温湿度传感器

1. int main(void)
   
2. {
   
3.     int16_t tem,hum;
   
4.     char out[20];
   
5.     board_init();
   
6.     gpio = bflb_device_get_by_name("gpio");
   
7.     bflb_gpio_init(gpio, GPIO_PIN_12, GPIO_OUTPUT | GPIO_FLOAT | GPIO_SMT_EN | GPIO_DRV_0);
   
8.     i2c_init();
   
9.     oled_init();
   
10.     dhtc12_init();
    
11.     while (1) {
    
12.         bflb_gpio_set(gpio, GPIO_PIN_12);
    
13.         bflb_mtimer_delay_ms(1000);
    
14.         bflb_gpio_reset(gpio, GPIO_PIN_12);
    
15.         bflb_mtimer_delay_ms(1000);
    
16.         if(MY_DHTC12_ReadHT(&dhtc12_dev,&tem,&hum) == 0)
    
17.         {
    
18.             printf("温度：%.1f℃  湿度：%.1f%%\r\n",tem/10.0,hum/10.0);
    
19.             sprintf(out,"T:%03.1f  H:%03.1f%% ",tem/10.0,hum/10.0);
    
20.             MY_OLED_SSD1315_DisplayString8x16(&oled_dev,0,4,0,out);
    
21.         }
    
22.     }
    
23. }

复制代码

效果

赞

赞！

赞

赞👍

不错不错！

学习了

恭喜