附上讀寫EEPROM的代碼，你再試著去改成HMC5883L的讀寫方式 I2C_HandleTypeDef hi2c_eeprom; void MX_I2C_EEPROM_Init(void) { hi2c_eeprom.Instance = EEPROM_I2Cx; hi2c_eeprom.Init.ClockSpeed = I2C_SPEEDCLOCK; hi2c_eeprom.Init.DutyCycle = I2C_DUTYCYCLE; hi2c_eeprom.Init.OwnAddress1 = 0; hi2c_eeprom.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; hi2c_eeprom.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; hi2c_eeprom.Init.OwnAddress2 = 0; hi2c_eeprom.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; hi2c_eeprom.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; HAL_I2C_Init(&hi2c_eeprom); } void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c) { GPIO_InitTypeDef GPIO_InitStruct; if(hi2c->Instance==EEPROM_I2Cx) { EEPROM_I2C_RCC_CLK_ENABLE(); EEPROM_I2C_GPIO_CLK_ENABLE(); /**I2C1 GPIO Configuration PB6 ------> I2C1_SCL PB7 ------> I2C1_SDA */ GPIO_InitStruct.Pin = EEPROM_I2C_SCL_PIN|EEPROM_I2C_SDA_PIN; GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(EEPROM_I2C_GPIO_PORT, &GPIO_InitStruct); } } void I2C_EEPROM_WriteByte(uint16_t Addr, uint8_t Reg, uint8_t Value) { HAL_StatusTypeDef status = HAL_OK; status = HAL_I2C_Mem_Write(&hi2c_eeprom, Addr, (uint16_t)Reg, I2C_MEMADD_SIZE_8BIT, &Value, 1, I2cxTimeout); if(status != HAL_OK) { I2C_EEPROM_Error(); } } uint8_t I2C_EEPROM_Readbyte(uint16_t Addr, uint8_t Reg) { HAL_StatusTypeDef status = HAL_OK; uint8_t value = 0; status = HAL_I2C_Mem_Read(&hi2c_eeprom, Addr, Reg, I2C_MEMADD_SIZE_8BIT, &value, 1, I2cxTimeout); if(status != HAL_OK) { I2C_EEPROM_Error(); } return value; }
