[问答]

max6675测温不准是什么原因造成的

280 测温

问答对人有帮助，内容完整，我也想知道答案 0 define MAX6675_CS_Pin GPIO_PIN_12 define MAX6675_CS_GPIO_Port GPIOB SPI_HandleTypeDef hspi2;/ USER CODE BEGIN Includes / / USER CODE END Includes / / Private typedef -----------------------------------------------------------// USER CODE BEGIN TD / / USER CODE END TD / / Private define ------------------------------------------------------------// USER CODE BEGIN Define / / USER CODE END Define / / Private macro -------------------------------------------------------------// USER CODE BEGIN Macro / / USER CODE END Macro / / Private variables ---------------------------------------------------------// USER CODE BEGIN PV / / USER CODE END PV / / Private function prototypes -----------------------------------------------// USER CODE BEGIN PFP / / USER CODE END PFP / / External functions --------------------------------------------------------// USER CODE BEGIN ExternalFunctions / / USER CODE END ExternalFunctions / / USER CODE BEGIN 0 //** @brief SPI2 Initialization Function @param None @retval None/static void MX_SPI2_Init(void){ / USER CODE BEGIN SPI2_Init 0 / / USER CODE END SPI2_Init 0 / / USER CODE BEGIN SPI2_Init 1 / / USER CODE END SPI2_Init 1 // SPI2 parameter configuration/hspi2.Instance = SPI2;hspi2.Init.Mode = SPI_MODE_MASTER;hspi2.Init.Direction = SPI_DIRECTION_2LINES;hspi2.Init.DataSize = SPI_DATASIZE_8BIT;hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;hspi2.Init.NSS = SPI_NSS_SOFT;hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;hspi2.Init.TIMode = SPI_TIMODE_DISABLE;hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;hspi2.Init.CRCPolynomial = 7;hspi2.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;hspi2.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;if (HAL_SPI_Init( hspi2) != HAL_OK){Error_Handler();}}/ USER CODE END 0 /void HAL_MspInit(void){/ USER CODE BEGIN MspInit 0 / / USER CODE END MspInit 0 / HAL_RCC_SYSCFG_CLK_ENABLE();HAL_RCC_PWR_CLK_ENABLE(); / System interrupt init/ / USER CODE BEGIN MspInit 1 / / USER CODE END MspInit 1 /} /* @brief SPI MSP Initialization This function configures the hardware resources used in this example @param hspi: SPI handle pointer @retval None/void HAL_SPI_MspInit(SPI_HandleTypeDef spiHandle){GPIO_InitTypeDef GPIO_InitStruct = {0};if(spiHandle->Instance==SPI2){/ USER CODE BEGIN SPI2_MspInit 0 / / USER CODE END SPI2_MspInit 0 // Peripheral clock enable /__HAL_RCC_SPI2_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE();/SPI2 GPIO ConfigurationPB13 ------> SPI2_SCKPB14 ------> SPI2_MISOPB15 ------> SPI2_MOSI/GPIO_InitStruct.Pin = GPIO_PIN_13\|GPIO_PIN_14\|GPIO_PIN_15;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;HAL_GPIO_Init(GPIOB, GPIO_InitStruct); / USER CODE BEGIN SPI2_MspInit 1 / / USER CODE END SPI2_MspInit 1 /}* } /** @brief SPI MSP De-Initialization This function freeze the hardware resources used in this example @param hspi: SPI handle pointer @retval None/void HAL_SPI_MspDeInit(SPI_HandleTypeDef spiHandle){if(spiHandle->Instance==SPI2){/ USER CODE BEGIN SPI2_MspDeInit 0 / / USER CODE END SPI2_MspDeInit 0 // Peripheral clock disable /__HAL_RCC_SPI2_CLK_DISABLE(); /SPI2 GPIO ConfigurationPB13 ------> SPI2_SCKPB14 ------> SPI2_MISOPB15 ------> SPI2_MOSI/HAL_GPIO_DeInit(GPIOB, GPIO_PIN_13\|GPIO_PIN_14\|GPIO_PIN_15); / USER CODE BEGIN SPI2_MspDeInit 1 / / USER CODE END SPI2_MspDeInit 1 /}* } / USER CODE BEGIN 1 / //MAX6675 片选引脚初始化void GPIO_Init(void){GPIO_InitTypeDef GPIO_InitStruct = {0}; / GPIO Ports Clock Enable /__HAL_RCC_GPIOB_CLK_ENABLE(); HAL_GPIO_WritePin(GPIOB, MAX6675_CS_Pin, GPIO_PIN_SET);/引脚配置 /GPIO_InitStruct.Pin = MAX6675_CS_Pin;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;HAL_GPIO_Init(GPIOB, GPIO_InitStruct);} /** @brief max66675模块初始化 @param None @retval None/void MAX6675_Init(void){GPIO_Init(); //片选引脚初始化MX_SPI2_Init(); //spi总线初始化} /* @brief max6675模块读写一个字节的数据 @param txData：要发送的数据 @retval 接收到的数据/uint8_t MAX6675_ReadWriteByte(uint8_t txData){unsigned char txdata,rxdata;txdata = txData;HAL_SPI_TransmitReceive( hspi2, txdata, rxdata,1,1000);return rxdata;} /* @brief max6675模块读取测得的原始数据 @param None @retval 温度的原始数据/uint16_t MAX6675_ReadRawValue(void){uint16_t tmp=0;MAX6675_CS(0);tmp = MAX6675_ReadWriteByte(0XFF); //read MSBtmp <<= 8;tmp \|= MAX6675_ReadWriteByte(0XFF); //read LSBMAX6675_CS(1); if (tmp 4){// thermocouple opentmp = 4095; //未检测到热电偶}else{tmp = tmp >> 3;}tmp=tmp&0x0FFF; //12bitreturn tmp;} /* @brief max6675模块读取温度 @param None @retval 温度值（单位：℃）/float MAX6675_ReadTemperature(void){return (MAX6675_ReadRawValue() 1024.0 / 4096);} //MAX6675 片选控制void MAX6675_CS(unsigned char choose){if(choose == 1){HAL_GPIO_WritePin(GPIOB, MAX6675_CS_Pin, GPIO_PIN_SET);}else{HAL_GPIO_WritePin(GPIOB, MAX6675_CS_Pin, GPIO_PIN_RESET);}} 0
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