stm32的max6675驱动代码

以下是一个简单的STM32驱动MAX6675的代码示例，使用SPI通信：

#include "stm32f1xx_hal.h"

#define MAX6675_CS_Pin GPIO_PIN_4
#define MAX6675_CS_GPIO_Port GPIOA

SPI_HandleTypeDef hspi1;

void MX_SPI1_Init(void)
{
  /* SPI1 parameter configuration*/
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
}

void MX_GPIO_Init(void)
{
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(MAX6675_CS_GPIO_Port, MAX6675_CS_Pin, GPIO_PIN_SET);

  /*Configure GPIO pin : MAX6675_CS_Pin */
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = MAX6675_CS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(MAX6675_CS_GPIO_Port, &GPIO_InitStruct);
}

float MAX6675_Read_Temp(void)
{
  uint8_t tx_data[2] = {0x00, 0x00};
  uint8_t rx_data[2] = {0x00, 0x00};

  HAL_GPIO_WritePin(MAX6675_CS_GPIO_Port, MAX6675_CS_Pin, GPIO_PIN_RESET);
  HAL_SPI_TransmitReceive(&hspi1, tx_data, rx_data, 2, 100);
  HAL_GPIO_WritePin(MAX6675_CS_GPIO_Port, MAX6675_CS_Pin, GPIO_PIN_SET);

  uint16_t raw_temp = ((uint16_t)rx_data[0] << 8) | rx_data[1];
  raw_temp >>= 3; // 右移3位，除以8

  return ((float)raw_temp * 0.25f);
}

int main(void)
{
  HAL_Init();
  MX_GPIO_Init();
  MX_SPI1_Init();

  float temperature = MAX6675_Read_Temp();
  // 现在temperature就是读取到的温度

  while (1)
  {
  }
}

注意，这只是一个基本的示例，你可能需要根据自己的实际情况进行修改和调整。