STM32F4 I2C/IIC 驱动程序

#include "stm32f4xx.h" void I2C_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure; GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOB, &GPIO_InitStructure); I2C_DeInit(I2C1); I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStructure.I2C_OwnAddress1 = 0xA0; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; //ack enable I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStructure.I2C_ClockSpeed = 100000; //100k I2C_Cmd(I2C1, ENABLE); I2C_Init(I2C1, &I2C_InitStructure); } void I2C_WriteByte(unsigned char id,unsigned char write_address,unsigned char byte) { I2C_GenerateSTART(I2C1,ENABLE); //产生起始条件 while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //等待ACK I2C_Send7bitAddress(I2C1,id,I2C_Direction_Transmitter); //向设备发送设备地址 while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); //等待ACK I2C_SendData(I2C1, write_address); //发送写入的寄存器地址 while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //等待ACK I2C_SendData(I2C1, byte); //发送数据 while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //发送完成 I2C_GenerateSTOP(I2C1, ENABLE); //产生结束信号 } unsigned char I2C_ReadByte(unsigned char id, unsigned char read_address) { unsigned char temp; while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, id, I2C_Direction_Transmitter); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); I2C_Cmd(I2C1, ENABLE); I2C_SendData(I2C1, read_address); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, id, I2C_Direction_Receiver); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)); I2C_AcknowledgeConfig(I2C1, DISABLE); I2C_GenerateSTOP(I2C1, ENABLE); while(!(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))); temp = I2C_ReceiveData(I2C1); I2C_AcknowledgeConfig(I2C1, ENABLE); return temp; }