stm32I2C⾃收发测试例程
define BufferSize 4
define I2C2_SLAVE_ADDRESS7 0x30
/* Private macro ————————————————————-*/
/* Private variables ———————————————————*/
vu8 I2C1_Buffer_Tx[BufferSize] = {1, 2, 3, 4}; /* I2C1待发送字节数组 */
vu8 I2C2_Buffer_Rx[BufferSize] = {0, 0, 0, 0}; /* I2C2待接收字节缓冲 */
vu8 Tx_Idx = 0; /* I2C1数据发送计数变量 */
vu8 Rx_Idx = 0; /* I2C2数据接收计数变量 */
/* ⾃定义参数宏 ——————————————————-*/
define I2C1_SLAVE_ADDRESS7 0x30 /* 定义 I2C1 本地地址为0x30 */ define I2C2_SLAVE_ADDRESS7 0x30 /* 定义 I2C2 本地地址为0x30 */ define BufferSize 4
/* ⾃定义函数宏 ——————————————————-*/
/* ⾃定义变量 ——————————————————-*/
/* ⽤户函数声明 ———————————————————*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void);
void I2c_Configuration(void);
int main(void)
{
/* 设置系统时钟 */
RCC_Configuration();
/* 设置 NVIC */
NVIC_Configuration();
/* 设置GPIO端⼝ */
GPIO_Configuration();
/* 设置USART */
USART_Configuration();
/* 设置 IIC */
I2c_Configuration();
/* I2C1产⽣开始条件 */
I2C_GenerateSTART(I2C1, ENABLE);
while(1);
}
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
FLASH_SetLatency(FLASH_Latency_2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08);
}
/* 开启 I2C1、I2C2 设备时钟 */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2, ENABLE);
/* 开启 GPIOA、GPIOB和 USART 设备时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); }
void GPIO_Configuration(void)
{
/* 定义 GPIO 初始化结构体 GPIO_InitStructure */
GPIO_InitTypeDef GPIO_InitStructure;
/* 配置 I2C1 设备的引脚为复⽤开漏模式 */
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;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* 配置 I2C2 设备的引脚为复⽤开漏模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* 配置 USART 设备引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
configuredclockspeed是什么意思GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void I2c_Configuration(void)
{
/* 定义 I2C 初始化结构体 I2C_InitStructure */
I2C_InitTypeDef I2C_InitStructure;
/*
*  I2C模式;
*  占空⽐50%;
*  本地地址（前⾯宏定义定义为0x30）
*  使能应答;
*  应答7位地址;
*  速率200K;
*/
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;//设置I2C接⼝为I2C模式
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;  //设置占空⽐为2/1
I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;    //设置第⼀个设备⾃⾝地址可以是7位也可以是10位I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//使能ACk应答
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; //设置应答7位地址
I2C_InitStructure.I2C_ClockSpeed = 200000;  //
I2C_Init(I2C1, &I2C_InitStructure);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C2_SLAVE_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;
I2C_Init(I2C2, &I2C_InitStructure);
/* 开启I2C1、I2C2 的事件、缓存中断 */
I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_BUF, ENABLE);
I2C_ITConfig(I2C2, I2C_IT_EVT | I2C_IT_BUF, ENABLE);
/* 使能I2C1、I2C2 接⼝ */
I2C_Cmd(I2C1, ENABLE);
I2C_Cmd(I2C2, ENABLE);
}
void NVIC_Configuration(void)
{
/* 定义 NVIC 初始化结构体 NVIC_InitStructure */
NVIC_InitTypeDef NVIC_InitStructure;
/* 选择 NVIC 优先级分组1 */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* 设置并使能 I2C1 中断 */
NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* 设置并使能 I2C2 中断 */
NVIC_InitStructure.NVIC_IRQChannel = I2C2_EV_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void USART_Configuration(void)
{
/* 定义USART初始化结构体 USART_InitStructure */
USART_InitTypeDef USART_InitStructure;
/* 定义USART初始化结构体 USART_ClockInitStructure */
USART_ClockInitTypeDef USART_ClockInitStructure;
/*
*  波特率为115200bps;
*  8位数据长度;
*  1个停⽌位，⽆校验;
*  禁⽤硬件流控制;
*  禁⽌USART时钟;
*  时钟极性低;
*  在第2个边沿捕获数据
*  最后⼀位数据的时钟脉冲不从 SCLK 输出；
*/
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1 , &USART_ClockInitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1 , &USART_InitStructure);
/* 使能USART1 */
USART_Cmd(USART1 , ENABLE);
}
void I2C1_EV_IRQHandler(void)
{
switch (I2C_GetLastEvent(I2C1))
{
case I2C_EVENT_MASTER_MODE_SELECT: /* 已发送起始条件 */
{
/* 发送从机地址 */
I2C_Send7bitAddress(I2C1, I2C2_SLAVE_ADDRESS7, I2C_Direction_Transmitter);
break;
}
case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:        /* 从机地址已发送 */    {
/* 发送第⼀个数据 */
printf("\r\n The I2C1 has send data 0x0%x\r\n", I2C1_Buffer_Tx[Rx_Idx]);
I2C_SendData(I2C1, I2C1_Buffer_Tx[Tx_Idx++]);
break;
}
case I2C_EVENT_MASTER_BYTE_TRANSMITTED:                /* 第⼀个数据已发送 */
{
if(Tx_Idx < BufferSize)
{
/* 继续发送剩余数据... ... */
printf("\r\n The I2C1 has send data 0x0%x\r\n", I2C1_Buffer_Tx[Rx_Idx]);
I2C_SendData(I2C1, I2C1_Buffer_Tx[Tx_Idx++]);
}
else
{
/* 剩余数据发送完毕，发送结束条件 */
I2C_GenerateSTOP(I2C1, ENABLE);
/* 禁⽌ I2C1 中断*/
I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_BUF, DISABLE);
}
break;
}
default:
{
break;
}
}
}
/*********************************************************************
* Function Name : I2C1_ER_IRQHandler
* Description : This function handles I2C1 Error interrupt request.
* Input : None
* Output : None
* Return : None
*********************************************************************/
void I2C1_ER_IRQHandler(void)
{
}

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