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发表于 2013-12-10 10:27:14
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- static void I2C_Configuration(void)
- {
- I2C_InitTypeDef I2C_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
-
- /* PB6,7 SCL and SDA */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; //设置管脚为复用功能开漏输出
- GPIO_Init(GPIOB, &GPIO_InitStructure); //I2C接口使用的GPIO管脚初始化
-
- I2C_DeInit(I2C1);
- I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; //设置I2C接口模式
- I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; //设置I2C接口的高低电平周期
- I2C_InitStructure.I2C_OwnAddress1 = 0x30; //设置I2C接口的主机地址
- I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; //设置是否开启ACK响应
- I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
- I2C_InitStructure.I2C_ClockSpeed = 100000; //100K速度
-
- I2C_Cmd(I2C1, ENABLE); //使能I2C接口
- I2C_Init(I2C1, &I2C_InitStructure); //I2C接口初始化
- /*允许1字节1应答模式*/
- I2C_AcknowledgeConfig(I2C1, ENABLE); //使能I2C接口响应
- }
- rt_uint16_t IIC_Read()
- {
- rt_uint16_t dataH = 0,dataL = 0;
- rt_uint16_t ret = 0;
- /* 起始位 */
- I2C_GenerateSTART(I2C1, ENABLE);
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
- I2C_Send7bitAddress(I2C1, 0x46, I2C_Direction_Transmitter); //写
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
- I2C_SendData(I2C1, 0x01); //Power on
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
-
- /* 停止位*/
- I2C_GenerateSTOP(I2C1, ENABLE);
- /* 起始位 */
- I2C_GenerateSTART(I2C1, ENABLE);
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
- I2C_Send7bitAddress(I2C1, 0x46, I2C_Direction_Transmitter); //写
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
- I2C_SendData(I2C1, 0x10); //H- resolution mode
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
-
- /* 停止位*/
- I2C_GenerateSTOP(I2C1, ENABLE);
- rt_thread_delay(20);//等待数据转换完成
- /* 起始位 */
- I2C_GenerateSTART(I2C1, ENABLE);
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
- I2C_Send7bitAddress(I2C1, 0x46, I2C_Direction_Receiver);//读
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
-
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
- dataH = I2C_ReceiveData(I2C1);
- while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
- dataL = I2C_ReceiveData(I2C1);
- I2C_GenerateSTOP(I2C1, ENABLE);
- ret = ((dataH << 8) | dataL);
- return ret;
- }
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之前操作一个IIC接口芯片的代码,可以参考下 |
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