//////////////////////////////////////////////////////////////////////////////////////////////////////////////////----->DS18B20部分程序 EndDevice
void TempDelay(unsigned int us){
while(us--);
}
void Init18b20 (void)
{
P0DIR |= 0x02; //P0_1输出
D18B20=1;
TempDelay(5);
D18B20=0;
TempDelay(1280); //delay 480--960 uS// 1280 stand for 480 us
D18B20=1;
TempDelay(106); //delay 15--60 uS// 106 stand for 40 us
P0DIR &= ~0x02; //P0_1 输入 对于CC2530芯片
if(D18B20==0) //读DS18B20的状态
flag = 1; //detect 1820 success!
else
flag = 0; //detect 1820 fail!
TempDelay(500); //60---240 us
P0DIR |= 0x02;
D18B20 = 1;
}
void WriteByte (unsigned char wr) //单字节写入
{
unsigned char i;
for (i=0;i<8;i++)
{
P0DIR |= 0x02;
D18B20 = 0;
TempDelay(5);
D18B20=wr&0x01;
TempDelay(120); //delay 45 uS //5
D18B20=1;
TempDelay(5);
wr >>= 1;
}
}
unsigned char ReadByte (void) //读取单字节
{
unsigned char i,u=0;
for(i=0;i<8;i++)
{
P0DIR |= 0x02;
D18B20 = 0;
TempDelay(3);
u >>= 1;
D18B20 = 1;
P0DIR &= ~0x02;
if(D18B20==1) //读取DS18B20的状态
u |= 0x80;
TempDelay (40);///////////////////////////////////////////读取的时候延时准确性很重要
}
return(u);
}
void read_bytes (unsigned char j) //什么时候用这个函数 有什么作用~
{
unsigned char i;
if(flag==1)
{
for(i=0;i
{
*p = ReadByte();
temp_buff = *p;
p++;
}
}
else if(flag==2)
{
for(i=0;i
{
*p = ReadByte();
id_buff = *p;
p++;
}
}
else
{
for(i=0;i
{
*p = ReadByte();
p++;
}
}
flag=0;
}
void read_temp(void) //什么时候用这个函数 有什么作用~
{
unsigned char i;
for(i=0;i<2;i++)
{
*p = ReadByte();
if(i==0)
{
temp_buff[0] = *p;
}
if(i==1)
{
temp_buff[1] = *p;
}
p++;
}
}
unsigned char CRC (unsigned char j)
{
unsigned char i,crc_data=0;
for(i=0;i
crc_data = CrcTable[crc_data^temp_buff];
return (crc_data);
}
void GemTemp (void)
{
flag = 1;
read_bytes (9);
if (CRC(9)==0) //校验正确
{
Temperature = (temp_buff[1]&0x07)*16 + temp_buff[0]/16;
// Temperature *= 0.625;
//Temperature /= 16;
TempDelay(5);
}
}
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 (0.0625)
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x48); //保存设定值
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0xb8); //回调设定值
}
void ReadID (void)//读取器件 id
{
Init18b20();
WriteByte(0x33); //read rom
flag = 2;
read_bytes(8);
//id_buff
}
void TemperatuerResult(void)
{
//p = id_buff;
ReadID();
p = id_buff;
Config18b20();
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0x44); //Temperature convert
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0xbe); //read Temperature
//read_temp();
p = temp_buff;
GemTemp();
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////DS18B20部分程序
将这部分程序添加在*_App.c哪个文件中,并另外建一个 .h文件,把#define D18B20 P0_1
void TempDelay (unsigned int us);
void Init18b20 (void);
void WriteByte (unsigned char wr); //单字节写入
unsigned char ReadByte (void);
void read_bytes (unsigned char j);
void read_temp(void);
unsigned char CRC (unsigned char j);
void GemTemp (void);
void Config18b20 (void);
void ReadID (void);
void TemperatuerResult(void);
char flag = 0;
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;
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};
当做 DS18B20.h文件,添加进去就好。
最后在你得 任务循环中 用 TemperatuerResult(); 这个函数,结果是 Temperature变量 ,就是温度值了~~~~ |