STM32F072的I2C配置

以下是STM32F072的I2C配置代码示例：

#include "stm32f0xx.h"

void I2C_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  I2C_InitTypeDef I2C_InitStructure;

  // Enable I2C clock
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

  // Enable GPIO clock
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

  // Configure I2C pins
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  // Connect I2C pins to AF
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);

  // Configure I2C
  I2C_InitStructure.I2C_Timing = 0x0010020A;
  I2C_InitStructure.I2C_OwnAddress1 = 0x00;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_DigitalFilter = 0x00;
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_OperationMode = I2C_OperationMode_I2C;
  I2C_InitStructure.I2C_GeneralCallMode = I2C_GeneralCall_Disable;
  I2C_InitStructure.I2C_NostretchMode = I2C_Nostretch_Disable;
  I2C_Init(I2C1, &I2C_InitStructure);

  // Enable I2C
  I2C_Cmd(I2C1, ENABLE);
}

在这个示例中，I2C1被配置为主模式，使用GPIOB6和GPIOB7作为SCL和SDA信号线。I2C的时序参数由I2C_Timing成员设置。其他的I2C配置参数由I2C_InitTypeDef结构体中的成员设置。完成I2C的配置后，需要调用I2C_Cmd函数使能I2C总线。