stm32F051的，试试看有用不：
#define _NOP() asm("nop");
#define BSRR_PB10Val 0x0400
#define BSRR_PB11Val 0x0800
#define BSRR_PA2Val 0x0004
#define SetDir_PortSensorA_IN() GPIOA->MODER &= ~(GPIO_MODER_MODER2)
#define SetDir_PortSensorA_Out() GPIOA->MODER |= (GPIO_MODER_MODER2_0);
#define SA_DQ1 GPIOA->BSRR = BSRR_PA2Val
#define SA_DQ0 GPIOA->BRR = BSRR_PA2Val
#define Status_SensorAPort GPIOA->IDR&BSRR_PA2Val
typedef struct
{
unsigned long CntTOK;
unsigned long CntTNG;
unsigned long CntInitNG;
uint16_t CurT; //读取的当前温度，形式为0xXXXX，前三个数字XXX表示当前温度，最后一个X为小于1度的部分（十进制0~9）
uint16_t LastT;
uint16_t EverT; //?
uchar BoxTPol; //温度正负判断辅助变量
uchar LastTPol;
uchar EverTPol;
uchar Error; //传感器出错次数，用来控制干扰滤除
uchar Buf18B20A[9];
} sSensor;
sSensor DS18B20A;
const uchar 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};
//读取温度传感器信号线输入信号，1为高电平，0为低电平
static uchar GetStatus_SnrPort(void)
{
if((Status_SensorAPort)!=0) return(1); else return(0);
}
//短延时使用，为uS量级
void delay_us(uint DlyInt32) //近似4.74/uS
{
DlyInt32+=(DlyInt32<<1);
while(DlyInt32--);
}
//CRC校验，查表法
uchar CRC_OK1(uchar *p1,uchar num)
{
uchar OutData1;
uchar countbyte1;
OutData1=0;
num++;
for(countbyte1=1;countbyte1<num;countbyte1++)
{
OutData1=CrcTable[OutData1^*p1];
p1++;
}
p1-=(num-1);
return(OutData1);
}
/*
//8字节CRC校验，运算法
static uchar CRC_OK(uchar *p)
{
uchar OutData,InData;
uchar countbyte,bitlen;
uchar crctem1,crctem2;
OutData=0;
for(countbyte=1;countbyte<10;countbyte++)
{
InData=*p;
for(bitlen=1;bitlen<9;bitlen++)
{
crctem1=OutData;
crctem2=crctem1^InData;
crctem2&=0x01;
OutData>>=1;
if(crctem2)
{
OutData+=0x80;
OutData^=0x0c;
}
InData>>=1;
}
p++;
}
return(!OutData);
}
*/
//往DS18B20中写一个字节
static void Write_18B20(unsigned char n)
{
unsigned char i;
for(i=0;i<8;i++)
{
SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk; //关systick中断
SetDir_PortSensorA_Out();
SA_DQ0; delay_us(7); //==延时0us---25us===
if((n&0X01)==0X01)
{
SetDir_PortSensorA_IN();
if(ParSeting==0) SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk; //开systick中断
delay_us(100); //64us delay_us(192)
}
else
{
if(ParSeting==0) SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk; //开systick中断
delay_us(100); //60uS delay_us(160);
SetDir_PortSensorA_IN();
delay_us(16); //10uS delay_us(32);
}
n=n>>1;
}
}
//从DS18B20读取一个字节
static unsigned char Read_18B20(void)
{
unsigned char i;
unsigned char temp;
for(i=0;i<8;i++)
{
temp=temp>>1;
SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk; //关systick中断
SetDir_PortSensorA_Out();
SA_DQ0; delay_us(2); //==延时0us---4us===
SetDir_PortSensorA_IN(); delay_us(1); //==延时0us---25us===
if((Status_SensorAPort)==0)
{
temp=temp&0x7F;
}else
{
temp=temp|0x80;
}
SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk; //开systick中断
delay_us(90); //==延时55us===
}
return temp;
}
//18B20总线初始化
uchar Init(void)
{
static uchar Step=0xff,PhaseTInit=0xff;
switch(Step)
{
case 0xff: { SetDir_PortSensorA_Out(); SA_DQ0; Step=0; PhaseTInit=0;//PhaseTInit=480*SweepFreq/1000000;
} break; // 低电平480uS
case 0: { if(PhaseTInit==0) Step=1; else PhaseTInit--; } break;
case 1: {
SetDir_PortSensorA_IN();
delay_us(100); //==延时70us
if(GetStatus_SnrPort()!=0)
{ if(DS18B20A.Error<16) DS18B20A.Error++; DS18B20A.CntInitNG+=2; }
else { if(DS18B20A.CntInitNG>0) DS18B20A.CntInitNG/=10; } //传感器恢复正常后快速恢复
Step=2; PhaseTInit=0; //PhaseTInit=410*SweepFreq/1000000; //410uS
} break;
case 2: { if(PhaseTInit==0) { Step=0xff; return(0); } else PhaseTInit--; } break;
default : break;
}
return(0xff);
}
//18B20跳过内部ROM匹配
uchar Skip(void)
{
Write_18B20(0xcc);
return(0);
}
//启动18B20温度转换
uchar Convert (void)
{
Write_18B20(0x44);
return(0);
}
//发送读取18B20寄存器指令
uchar ReadDo (void)
{
Write_18B20(0xbe);
return(0);
}
//设置DS18B20测温分辨率和转换时间
void SetPar18B20A(void)
{
ParSeting=1;
Init();
Write_18B20(0xCC); // 跳过读序号列号的操作
Write_18B20(0x4E); // 设置参数寄存器
Write_18B20(0x00); // TH
Write_18B20(0x00); // TL
Write_18B20(0x7F); // 设置参数寄存器 0x5F 11位 0x7F12位
ParSeting=0;
}
//传感器出错后返回100度，Error=16,传感器测得温度低于零下25度时返回100度，Error=0；
uchar ReadTemp (void)
{
static uchar temp_low,temp_high; //错误设为char 类型时某些温度范围输出异常
static uint temperature,GetTCounter=0;
static uchar ReadTStep=0xff;
switch(ReadTStep)
{
case 0xff: { DS18B20A.Buf18B20A[0]=Read_18B20(); temp_low=DS18B20A.Buf18B20A[0]; ReadTStep=1; } break;
case 1: { DS18B20A.Buf18B20A[1]=Read_18B20(); temp_high=DS18B20A.Buf18B20A[1]; ReadTStep=2; } break;
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8: { DS18B20A.Buf18B20A[ReadTStep]=Read_18B20(); ReadTStep++; } break;
case 9: {
if(((uint)((uint)(temp_high*256)+temp_low)&0x8000)==0x8000)
{ temperature=~((temp_high*256)+temp_low)+1;
DS18B20A.BoxTPol=1; }
else
{ temperature=(temp_high*256+temp_low);
DS18B20A.BoxTPol=0; }
if(DS18B20A.Buf18B20A[4]==0xff) temperature<<=3; //DS18S20时测得的数据要左移三位
ReadTStep++;
} break;
case 10: {
if((DS18B20A.Buf18B20A[5]!=0xff)||CRC_OK1(DS18B20A.Buf18B20A,9))
{
if(DS18B20A.Error<10) DS18B20A.Error++;
else {DS18B20A.CurT=0x7B0; DS18B20A.BoxTPol=0; } //123
DS18B20A.CntTNG++;
}
else
{
if(DS18B20A.Error>0) DS18B20A.Error--;
DS18B20A.CntTOK++;
DS18B20A.CurT=temperature;
if(DS18B20A.CurT==1360) //去除偶尔出现的85度（复位状态或传感器VCC脚接触不良）干扰，避免温控状态受干扰突变
{
DS18B20A.CurT=DS18B20A.LastT;
}
if(DS18B20A.BoxTPol==1)
{
if((DS18B20A.LastTPol==0)&&(DS18B20A.EverTPol==0)) { if(DS18B20A.CurT>50) { DS18B20A.CurT=DS18B20A.LastT; DS18B20A.BoxTPol=0; } } //去除突发干扰
else
{
if(DS18B20A.CurT<=400) { DS18B20A.CurT=0; DS18B20A.BoxTPol=0; } //-25度-0度时强制读取值为0度
else { DS18B20A.CurT=1952; DS18B20A.BoxTPol=0; } //低于零下25度时置读取值为122度（强制关闭加热）
}
}
if(DS18B20A.CurT<10) DS18B20A.BoxTPol=0;
DS18B20A.EverT=DS18B20A.LastT;
DS18B20A.EverTPol=DS18B20A.LastTPol;
DS18B20A.LastT=DS18B20A.CurT;
DS18B20A.LastTPol=DS18B20A.BoxTPol;
}
ReadTStep=0xff; GetTCounter++; return(0);
} break;
default : break;
}
return(0xff);
}
//=======================================================================================
//============获取DS18B20的温度值========================================================
//=======================================================================================
//=== MCU对DS18B20进行温度转换时,其操作必须满足以下过程:
//=== 1- 每一次读写之前都要对DS18B20进行复位.
//=== 2- 完成复位后发送一条ROM命令到DS18B20.
//=== 3- 最后发送一条RAM命令到DS18B20.
void GetT_SnrA(void) //进23次完成一次温度读取
{
static uchar GetTPhase=0xff;
switch(GetTPhase)
{
case 0xff: { if(Init()==0) GetTPhase=0; } break;
case 0: { if(Skip()==0) GetTPhase=1; } break;
case 1: { if(Convert()==0) GetTPhase=2; } break;
case 2: { if(Init()==0) GetTPhase=3; } break;
case 3: { if(Skip()==0) GetTPhase=4; } break;
case 4: { if(ReadDo()==0) GetTPhase=5; } break;
case 5: {
if(ReadTemp()==0)
{
GetTPhase=0xff;
SCH_tasks_G[TaskID_ReadT].Suspended=SweepFreq/12; //执行一次后挂起0.1秒等待唤醒
}
} break;
default: GetTPhase=0xff; break;
}
} |
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