零基础STM32单片机编程入门(十四) DS18B20温度传感器模块实战含源码
typedef unsigned char u8;
typedef unsigned long u32;
void Init18b20 (void);
void WriteByte (unsigned char wr); //单字节写入
void read_bytes (unsigned char j); //单字节读取
unsigned char Temp_CRC (unsigned char j);//计算CRC
void GemTemp (void);//获取温度
void Config18b20 (void);//配置18B20
void ReadID (void);//读取ID
void TemperatuerResult(void);
void SystemClock_Config(void);
unsigned long Count;
//等待us级
void Delay_us(unsigned long i)
{
unsigned long j;
for(;i>0;i--)
{
for(j=12;j>0;j--);
}
}
unsigned char flag;
unsigned int Temperature;//温度
unsigned char temp_buff[9]; //存储读取的字节，read scratchpad为9字节，read rom ID为8字节
unsigned char id_buff[8];
unsigned char *p;
unsigned char crc_data;
//CRC表格
const unsigned char CrcTable [256]={
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
/************************************************************
*Function:18B20初始化
*parameter:
*Return:
*Modify:
*************************************************************/
void Init18b20 (void)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_SET);
Delay_us(2); //延时2微秒
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
Delay_us(490); //delay 530 uS//80
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
Delay_us(100); //delay 100 uS//14
if(HAL_GPIO_ReadPin(GPIOA ,GPIO_PIN_0)== 0)
flag = 1; //detect 1820 success!
else
flag = 0; //detect 1820 fail!
Delay_us(480); //延时480微秒
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_SET);
}
/************************************************************
*Function:向18B20写入一个字节
*parameter:
*Return:
*Modify:
*************************************************************/
void WriteByte (unsigned char wr) //单字节写入
{
unsigned char i;
for (i=0;i<8;i++)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
Delay_us(2);
if(wr&0x01) HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_SET);
else HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
Delay_us(45); //delay 45 uS //5
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_SET);
wr >>= 1;
}
}
/************************************************************
*Function:读18B20的一个字节
*parameter:
*Return:
*Modify:
*************************************************************/
unsigned char ReadByte (void) //读取单字节
{
unsigned char i,u=0;
for(i=0;i<8;i++)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
Delay_us (2);
u >>= 1;
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_SET);
Delay_us (4);
if(HAL_GPIO_ReadPin(GPIOA , GPIO_PIN_0) == 1)
u |= 0x80;
Delay_us (65);
}
return(u);
}
/************************************************************
*Function:读18B20
*parameter:
*Return:
*Modify:
*************************************************************/
void read_bytes (unsigned char j)
{
unsigned char i;
for(i=0;i<j;i++)
{
*p = ReadByte();
p++;
}
}
/************************************************************
*Function:CRC校验
*parameter:
*Return:
*Modify:
*************************************************************/
unsigned char Temp_CRC (unsigned char j)
{
unsigned char i,crc_data=0;
for(i=0;i<j;i++) //查表校验
crc_data = CrcTable[crc_data^temp_buff[i]];
return (crc_data);
}
/************************************************************
*Function:读取温度
*parameter:
*Return:
*Modify:
*************************************************************/
void GemTemp (void)
{
read_bytes (9);
if (Temp_CRC(9)==0) //校验正确
{
Temperature = temp_buff[1]*0x100 + temp_buff[0];
Temperature /= 16;
Delay_us(10);
}
}
/************************************************************
*Function:内部配置
*parameter:
*Return:
*Modify:
*************************************************************/
void Config18b20 (void) //重新配置报警限定值和分辨率
{
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x4e); //write scratchpad
WriteByte(0x19); //上限
WriteByte(0x1a); //下限
WriteByte(0x7f); //set 12 bit (0.125)
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x48); //保存设定值
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0xb8); //回调设定值
}
/************************************************************
*Function:读18B20ID
*parameter:
*Return:
*Modify:
*************************************************************/
void ReadID (void)//读取器件 id
{
Init18b20();
WriteByte(0x33); //read rom
read_bytes(8);
}
/************************************************************
*Function:18B20读温度流程
*parameter:
*Return:
*Modify:
*************************************************************/
void TemperatuerResult(void)
{
p = id_buff;
ReadID();
Config18b20();
Init18b20 ();
HAL_Delay(20);
WriteByte(0xcc); //skip rom
WriteByte(0x44); //Temperature convert
Init18b20 ();
HAL_Delay(20);
WriteByte(0xcc); //skip rom
WriteByte(0xbe); //read Temperature
p = temp_buff;
GemTemp();
}
void GetTemp()
{
if(Count == 2) //每隔一段时间读取温度
{
Count=0;
TemperatuerResult();
}
Count++;
}
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();//8M外部晶振，72M主频
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
OLED_Init();//OLED初始化
OLED_Clear();//清屏
GetTemp(); //获取温度
GetTemp(); //再次获取温度
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
GetTemp(); //再次获取温度
OLED_Clear(); //OLED清屏
OLED_ShowCHinese(18,0,0);//光
OLED_ShowCHinese(36,0,1);//子
OLED_ShowCHinese(54,0,2);//物
OLED_ShowCHinese(72,0,3);//联
OLED_ShowCHinese(90,0,4);//网
OLED_ShowString(6,3,"DS18B20 Test");
OLED_ShowString(0,6,"Temperature:");
OLED_ShowNum(100,6,Temperature,3,16);//显示温度
HAL_Delay(1000);//等待1S
}
/* USER CODE END 3 */
}