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RT-Thread DS18B20温度传感器驱动程序

2017-4-10 17:02:23 6056 温度传感器

0 本帖最后由 a77582508 于 2017-4-10 17:11 编辑复制代码 //首先查到到相关的DS18B20驱动 //然后打开驱动打开方式为RT_NULL //打开成功就可以调用rt_device_read函数读取温度 // #include #include #include //还没有添加调试信息 //应该添加一个.h文件 #if 0 /* 库函数方式 / #define DQ_0(PORT_DQ,PIN_DQ) GPIO_ResetBits(PORT_DQ, PIN_DQ) #define DQ_1(PORT_DQ,PIN_DQ) GPIO_SetBits(PORT_DQ, PIN_DQ) / 判断DQ输入是否为低 / #define DQ_IS_HIGH() GPIO_ReadInputDataBit(PORT_DQ, PIN_DQ) #else / 直接操作寄存器，提高速度 / #define DQ_0(PORT_DQ,PIN_DQ) PORT_DQ->BSRR \|= (PIN_DQ<<16) #define DQ_1(PORT_DQ,PIN_DQ) PORT_DQ->BSRR \|= (PIN_DQ) / 判断DQ输入是否为低 / #define DQ_IS_HIGH(PORT_DQ,PIN_DQ) (PORT_DQ->IDR & PIN_DQ) #endif //设置IO口方向 #define _IO_IN(CR,BIT_AND,BIT_OR) {CR&=BIT_AND;CR\|=BIT_OR;} #define _IO_OUT(CR,BIT_AND,BIT_OR) {CR&=BIT_AND;CR\|=BIT_OR;} //驱动名字 #define HARD_DEVICE_NAME_FORMAT "18b20_%d" #define HARD_DEVICE_NAME_SIZE (sizeof(HARD_DEVICE_NAME_FORMAT) + 2) //获得数组元素个数 #ifndef ARRAY_SIZE #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0])) #endif //IO口相关信息 struct ds18b20_gpio_desc { uint32_t rcc; GPIO_TypeDef gpio; uint32_t pin; }; //在这里添加DS18B20相关引脚信息 //如果有多个DS18B20，依次添加即可 //目前只支持一个引脚上挂一个DS18B20 const static struct ds18b20_gpio_desc _hard_desc[] = { {RCC_APB2Periph_GPIOA, GPIOA, GPIO_Pin_3}, }; //其他地方不需要修改 //设置IO方向 struct _IO_ { uint32_t _IO_IN_and; uint32_t _IO_IN_or; uint32_t _IO_OUT_and; uint32_t _IO_OUT_or; volatile uint32_t * _CRx; }; //DS18B20驱动 struct _ds18b20_drv { struct rt_device device; struct _IO_ io; const struct ds18b20_gpio_desc * hard_desc; rt_mutex_t mutex; }; //内部使用，左移四位 static uint32_t _crol_(uint32_t c) { uint32_t temp; temp = c<<4; c = c>>(sizeof(uint32_t)8-4); return c \|= temp; } //DS18B20复位 static rt_err_t _ds18b20_reset(struct _ds18b20_drv _drv) { uint8_t retry = 0; _IO_OUT(_drv->io._CRx,_drv->io._IO_OUT_and,_drv->io._IO_OUT_or); DQ_0(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(750);//拉低750us DQ_1(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(10); _IO_IN(_drv->io._CRx,_drv->io._IO_IN_and,_drv->io._IO_IN_or); while(DQ_IS_HIGH(_drv->hard_desc->gpio,_drv->hard_desc->pin)&&retry<200) { retry++; rt_delay_us(1); } if(retry>=200) return RT_ERROR; while((!DQ_IS_HIGH(_drv->hard_desc->gpio,_drv->hard_desc->pin))&&retry<240) { retry++; rt_delay_us(1); } if(retry>=240) return RT_ERROR; return RT_EOK; } //DS18B20读一个字节 static rt_err_t _ds18b20_read_byte(struct _ds18b20_drv * _drv, uint8_t * data) { uint8_t bit = 0,result = 0; uint8_t i = 0; for(i = 0;i<8;i++) { _IO_OUT(_drv->io._CRx,_drv->io._IO_OUT_and,_drv->io._IO_OUT_or); DQ_0(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(1); DQ_1(_drv->hard_desc->gpio,_drv->hard_desc->pin); _IO_IN(_drv->io._CRx,_drv->io._IO_IN_and,_drv->io._IO_IN_or); rt_delay_us(12); if(DQ_IS_HIGH(_drv->hard_desc->gpio,_drv->hard_desc->pin)) bit=1; else bit=0; result=(bit<<7)\|(result>>1); rt_delay_us(50); } data = result; return RT_EOK; } //DS18B20写一个字节 static uint8_t _ds18b20_write_byte(struct _ds18b20_drv _drv, uint8_t data) { uint8_t i, testb; _IO_OUT(_drv->io._CRx,_drv->io._IO_OUT_and,_drv->io._IO_OUT_or); for (i=0;i<8;i++) { testb=data&0x01; data=data>>1; if (testb) { DQ_0(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(2); DQ_1(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(60); } else { DQ_0(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(60); DQ_1(_drv->hard_desc->gpio,_drv->hard_desc->pin); rt_delay_us(2); } } return RT_EOK; } //DS18B20转换一次 static rt_err_t _ds18b20_start(struct _ds18b20_drv * _drv) { rt_base_t level; if(_ds18b20_reset(_drv) == RT_EOK) { level = rt_hw_interrupt_disable(); _ds18b20_write_byte(_drv,0xcc); // skip rom _ds18b20_write_byte(_drv,0x44); // convert rt_hw_interrupt_enable(level); return RT_EOK; } return RT_ERROR; } //ds18b20读取温度 static rt_err_t _ds18b20_read_data(struct _ds18b20_drv * _drv, float * result) { rt_base_t level; uint8_t data_H, data_L; short data; _ds18b20_reset(_drv); level = rt_hw_interrupt_disable(); _ds18b20_write_byte(_drv,0xcc); // skip rom _ds18b20_write_byte(_drv,0xbe); // convert _ds18b20_read_byte(_drv, &data_L); // LSB _ds18b20_read_byte(_drv, &data_H); // MSB rt_hw_interrupt_enable(level); data = data_H; data <<= 8; data \|= data_L; if(data&0xF800) result=(~data+1)0.062510; else result=data0.0625; if(result>-55 && result<125) return RT_EOK; else return RT_ERROR; } static rt_err_t STM32_ds18b20_init(rt_device_t dev) { GPIO_InitTypeDef GPIO_InitStructure; uint32_t TempInAnd,TempInOr,TempOutAnd,TempOutOr; uint16_t GPIO_Pin_x = 0; struct _ds18b20_drv ds18b20 = (struct _ds18b20_drv )dev; RCC_APB2PeriphClockCmd(ds18b20->hard_desc->rcc, ENABLE); //使能时钟 GPIO_InitStructure.GPIO_Pin = ds18b20->hard_desc->pin; // 推挽输出 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(ds18b20->hard_desc->gpio, &GPIO_InitStructure); GPIO_SetBits(ds18b20->hard_desc->gpio,ds18b20->hard_desc->pin);//输出1 TempInAnd = 0xFFFFFFF0; TempOutAnd = 0xFFFFFFF0; TempInOr = 0x00000008; TempOutOr = 0x00000003; if (((uint32_t)GPIO_InitStructure.GPIO_Pin & ((uint32_t)0x00FF)) != 0x00) { ds18b20->io._CRx = &(ds18b20->hard_desc->gpio->CRL); GPIO_Pin_x = ds18b20->hard_desc->pin>>1; } if((GPIO_InitStructure.GPIO_Pin > 0x00FF)) { ds18b20->io._CRx = &(ds18b20->hard_desc->gpio->CRH); GPIO_Pin_x = ds18b20->hard_desc->pin>>9; } while(GPIO_Pin_x) { TempInAnd = _crol_(TempInAnd); TempOutAnd = _crol_(TempOutAnd); TempInOr = _crol_(TempInOr); TempOutOr = _crol_(TempOutOr); GPIO_Pin_x >>= 1; } ds18b20->io._IO_IN_and = TempInAnd; ds18b20->io._IO_IN_or = TempInOr; ds18b20->io._IO_OUT_and = TempOutAnd; ds18b20->io._IO_OUT_or = TempOutOr; return RT_EOK; } static rt_err_t stm32_ds18b20_open(rt_device_t dev, rt_uint16_t oflag) { struct _ds18b20_drv ds18b20 = (struct _ds18b20_drv )dev; return _ds18b20_reset(ds18b20); } static rt_err_t stm32_ds18b20_close(rt_device_t dev) { return RT_EOK; } static rt_size_t stm32_ds18b20_read(rt_device_t dev, rt_off_t pos, void buffer, rt_size_t size) { float temp; int count = 0,i = 0; float * data = (float )buffer; struct _ds18b20_drv ds18b20 = (struct _ds18b20_drv )dev; while(i<(size/sizeof(float))) { rt_mutex_take(ds18b20->mutex,RT_WAITING_FOREVER); if(_ds18b20_start(ds18b20) == RT_EOK) { rt_thread_delay(800); if(_ds18b20_read_data(ds18b20, &temp) == RT_EOK) { data = temp; count++; } else { data = 85; } } rt_mutex_release(ds18b20->mutex); i++; } return count; } static rt_err_t stm32_ds18b20_control(rt_device_t dev, rt_uint8_t cmd, void args) { return RT_EOK; } int ds18b20_drv_init(void) { int i = 0, count = 0; char dev_name[HARD_DEVICE_NAME_SIZE] = ""; struct _ds18b20_drv _dev = RT_NULL; for(i=0; i { _dev = (struct _ds18b20_drv )rt_malloc(sizeof(struct _ds18b20_drv)); if (RT_NULL == _dev) { continue; } rt_sprintf(dev_name, HARD_DEVICE_NAME_FORMAT, i); if(RT_NULL ==rt_device_find(dev_name)) { _dev->hard_desc = &(_hard_desc); _dev->device.init = stm32_ds18b20_init; _dev->device.open = stm32_ds18b20_open; _dev->device.close = stm32_ds18b20_close; _dev->device.read = stm32_ds18b20_read; _dev->device.write = RT_NULL; _dev->device.control = stm32_ds18b20_control; _dev->device.user_data = RT_NULL; rt_device_register(&(_dev->device),dev_name,RT_DEVICE_FLAG_RDONLY); _dev->mutex = rt_mutex_create(dev_name,RT_IPC_FLAG_FIFO); //创建信号量没有判断是否成功 count++; } } return count; } INIT_DEVICE_EXPORT(ds18b20_drv_init); 0
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