MTK DS18B20温度传感器驱动.docVIP

#ifdef __GRADUATE_DESIGN__ #include MMI_features.h #include MMI_include.h #include mmi_frm_gprot.h #include mmi_frm_prot.h #include mmi_frm_ucs2_str_dcl.h /* define the string function pointer */ #include StatusIconRes.h #include wgui_categories_inputs.h #include IMERes.h #include CommonScreensResDef.h #include AllAppGprot.h #include ProtocolEvents.h #include AsyncEventsGprot.h #include ATHandlerProt.h #include AlarmFrameWorkProt.h #include Service.h #include SATGProts.h #include CPHSProtocolHandlers.h #include EngineerModeGprot.h #include FactoryModeProt.h #include gpioInc.h extern const char gpio_14_graduate_design_pin; extern const char gpio_2_graduate_design_pin; extern void GPIO_WriteIO(char data, char port); extern char GPIO_ReadIO(char port); extern void GPIO_InitIO(char direction, char port); //#define DS18B20_PIN gpio_2_graduate_design_pin #define DS18B20_PIN gpio_14_graduate_design_pin #define DS18B20_DELAY_4US 40 void Init_DS18B20(void); unsigned char ReadOneChar(void); void WriteOneChar(unsigned char dat); void Ds18b20_Read_Temperature(void); void Delay10Us(kal_uint16 data); #define DS18B20_PIN_HIGH \ {\ volatile kal_uint32 i;\ GPIO_InitIO(1, DS18B20_PIN); \ GPIO_WriteIO(1, DS18B20_PIN); \ for (i=0; i DS18B20_DELAY_4US; i++); \ } #define DS18B20_PIN_LOW \ {\ volatile kal_uint32 i;\ GPIO_InitIO(1, DS18B20_PIN); \ GPIO_WriteIO(0, DS18B20_PIN); \ for (i=0; i DS18B20_DELAY_4US; i++); \ } void Delay10Us(kal_uint16 data) { volatile kal_uint32 i; for ( i =0; i data*10*3000; i++); } //18b20初始化函数 void Init_DS18B20(void) { unsigned char x=0; DS18B20_PIN_HIGH; //DQ拉高，相当于复位 Delay10Us(8); //稍做延时 DS18B20_PIN_LOW; //I/O将DQ拉低 Delay10Us(65); //精确延时 大于 480us DS18B20_PIN_HIGH; //拉高总线 Delay10Us(5); GPIO_InitIO(0, DS18B20_PIN); x = GPIO_ReadIO(DS18B20_PIN); kal_prompt_trace(TRACE_INFO,Init_DS18B20 init x=%d,x); // x=DQ; //稍做延时后 如果x=0则初始化成功 x=1则初始化失败 Delay10Us(18); //GPIO_InitIO(1, DS18B20_PIN); } //读一