【MM32F5270开发板试用】 MindSDK下i2c读写24C02测试

学习MindSDK下的I2C读写24c02测试。

* 硬件电路
开发板上I2C硬件电路

使用PC6和PC7端口的I2C1接口

* 程序部分

• 引脚配置

  void BOARD_InitPins(void)
  {
    /* PB6 - UART1_TX. */
    GPIO_Init_Type gpio_init;
    gpio_init.Pins  = GPIO_PIN_6;
    gpio_init.PinMode  = GPIO_PinMode_AF_PushPull;
    gpio_init.Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &gpio_init);
    GPIO_PinAFConf(GPIOB, gpio_init.Pins, GPIO_AF_7);
  
    /* PB7 - UART1_RX. */
    gpio_init.Pins  = GPIO_PIN_7;
    gpio_init.PinMode  = GPIO_PinMode_In_Floating;
    gpio_init.Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &gpio_init);
    GPIO_PinAFConf(GPIOB, gpio_init.Pins, GPIO_AF_7);
  
    /* PC6 - I2C1_SCL. */
    gpio_init.Pins  = GPIO_PIN_6;
    gpio_init.PinMode  = GPIO_PinMode_AF_OpenDrain;
    gpio_init.Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &gpio_init);
    GPIO_PinAFConf(GPIOC, gpio_init.Pins, GPIO_AF_4);
  
    /* PC7 - I2C1_SDA. */
    gpio_init.Pins  = GPIO_PIN_7;
    gpio_init.PinMode  = GPIO_PinMode_AF_OpenDrain;
    gpio_init.Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &gpio_init);
    GPIO_PinAFConf(GPIOC, gpio_init.Pins, GPIO_AF_4);
  }

• main.c

  int main(void)
  {
        uint32_t i;
        uint8_t i2c_txdat[8];
        uint8_t i2c_rxdat[8];
    BOARD_Init();
        app_i2c_init();
    printf("\r\ni2c_master_basic example\r\n");
        
    /* Initialize I2C. */
        i2c_txdat[0] = 0x00;
        i2c_txdat[1] = 0x01;
        i2c_txdat[2] = 0x55;
        i2c_txdat[3] = 0xaa;
        i2c_txdat[4] = 0xff;
        i2c_txdat[5] = 0x5f;
        i2c_txdat[6] = 0xf5;
        i2c_txdat[7] = 0xaa;
        
        if( false == app_i2c_write(8, i2c_txdat) )
        {
            printf("I2C write failed.\r\n");
        }
        else
        {
            printf("write data: ");
            for (i = 0u; i < 8; i++)
            {
                    printf("0x%02X, ", i2c_txdat[i]);
            }
            printf("\r\n");
        }
        
        if ( false == app_i2c_read(7, i2c_rxdat) )  /* Received data successfully. */
        {
                printf("I2C read failed.\r\n");
        }
        else
        {
            printf("read data: ");
            for (i = 0u; i < 7; i++)
            {
                    printf("0x%02X, ", i2c_rxdat[i]);
            }
            printf("\r\n");
        }
        
        while(1);
  }

• 初始化和收发代码

  /* Initialize I2C */
  void app_i2c_init(void)
  {
    /* Setup I2C initialization values. */
    I2C_Master_Init_Type i2c_init;
    i2c_init.ClockFreqHz = BOARD_I2C_FREQ;
    i2c_init.BaudRate = I2C_BaudRate_100K;
  
    /* Initialize I2C master. */
    I2C_InitMaster(BOARD_I2C_PORT, &i2c_init);
  
    /* The target device address needs to be configured before enabling. */
    I2C_SetTargetAddr(BOARD_I2C_PORT, APP_I2C_TARGET_ADDR);
  
    /* Enable I2C. */
    I2C_Enable(BOARD_I2C_PORT, true);
  }
  
  /* Write data to target device, true to writing succeed, false to writing failed. */
  bool app_i2c_write(uint8_t txlen, uint8_t *txbuf)
  {
    app_i2c_xfer.WaitTimes = APP_I2C_TIMEOUT_TIME;
    app_i2c_xfer.TxBuf = txbuf;
    app_i2c_xfer.TxLen = txlen;
  
    I2C_Enable(BOARD_I2C_PORT, true);  /* Disable I2C to clear tx fifo, and enabled I2C to perform the write operation again. */
    if ( false == I2C_MasterWriteBlocking(BOARD_I2C_PORT, &app_i2c_xfer) )
    {
        return false;
    }
    else
    {
        return true;
    }
  }
  
  /* Read data to target device, true to reading succeed, false to reading failed. */
  bool app_i2c_read(uint8_t rxlen, uint8_t *rxbuf)
  {
    app_i2c_xfer.WaitTimes = APP_I2C_TIMEOUT_TIME;
    app_i2c_xfer.RxBuf = rxbuf;
    app_i2c_xfer.RxLen = rxlen;
  
    I2C_Enable(BOARD_I2C_PORT, true);  /* Disable I2C to clear tx fifo, and enabled I2C to perform the read operation again. */
    if ( false == I2C_MasterReadBlocking(BOARD_I2C_PORT, &app_i2c_xfer) )
    {
        return false;
    }
    else
    {
        return true;
    }
  }
  

* 运行结果

开发板上电，先向地址0x00开始写8个字节的数据，在从地址0x00读出8个字节的数据。