stm32 i2c_send7bitaddress
时间: 2023-04-26 11:06:41 浏览: 130
stm32 i2c_send7bitaddress是STM32系列微控制器中用于向I2C总线发送7位地址的函数。它可以将7位地址发送到I2C总线上,以便与其他设备进行通信。这个函数通常用于I2C总线通信中的从设备地址寻址。
相关问题
编写一段STM32 I2C驱动代码
这里提供一个简单的STM32 I2C驱动代码,需要根据具体的芯片型号和硬件连接进行修改。
```c
#include "stm32f4xx.h"
#define I2C_TIMEOUT 10000
void I2C_Init() {
GPIO_InitTypeDef GPIO_InitStruct;
I2C_InitTypeDef I2C_InitStruct;
// Enable I2C clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// Enable GPIO clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// Configure I2C pins
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
// Connect I2C pins to AF
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
// Configure I2C
I2C_InitStruct.I2C_ClockSpeed = 100000;
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStruct.I2C_OwnAddress1 = 0x00;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStruct);
// Enable I2C
I2C_Cmd(I2C1, ENABLE);
}
uint8_t I2C_ReadByte(uint8_t slave_address, uint8_t reg_address) {
uint8_t data = 0;
// Send start condition
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) {}
// Send slave address for write
I2C_Send7bitAddress(I2C1, slave_address, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) {}
// Send register address
I2C_SendData(I2C1, reg_address);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) {}
// Send repeated start condition
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) {}
// Send slave address for read
I2C_Send7bitAddress(I2C1, slave_address, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) {}
// Receive data byte
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) {}
data = I2C_ReceiveData(I2C1);
// Send stop condition
I2C_GenerateSTOP(I2C1, ENABLE);
return data;
}
void I2C_WriteByte(uint8_t slave_address, uint8_t reg_address, uint8_t data) {
// Send start condition
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) {}
// Send slave address for write
I2C_Send7bitAddress(I2C1, slave_address, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) {}
// Send register address
I2C_SendData(I2C1, reg_address);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) {}
// Send data byte
I2C_SendData(I2C1, data);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) {}
// Send stop condition
I2C_GenerateSTOP(I2C1, ENABLE);
}
```
这个代码实现了基本的I2C读写操作,使用了STM32的标准库函数。需要注意的是,这个代码只是提供了一个参考,具体的实现还需要根据硬件的具体情况进行调整。
stm32 i2c通信
STM32可以通过I2C总线与其他设备进行通信。I2C总线是一种串行通信协议,允许多个设备在同一个总线上通信。下面是STM32 I2C通信的基本步骤:
1. 配置I2C总线的GPIO管脚和时钟。
2. 初始化I2C外设,并设置传输速率和数据格式。
3. 发送起始信号和从设备地址。
4. 发送数据或读取数据。
5. 发送停止信号。
以下是一个简单的STM32 I2C通信示例代码,用于向从设备发送数据:
```
#include "stm32f4xx.h"
#include "stm32f4xx_i2c.h"
#define I2C_SPEED 100000 // I2C传输速率
#define I2C_TIMEOUT 1000 // I2C超时时间
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
I2C_InitTypeDef I2C_InitStruct;
// 使能I2C和GPIO时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// 配置GPIO管脚
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
// 配置GPIO复用功能
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
// 配置I2C参数
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_OwnAddress1 = 0x00;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStruct.I2C_ClockSpeed = I2C_SPEED;
I2C_Init(I2C1, &I2C_InitStruct);
// 使能I2C外设
I2C_Cmd(I2C1, ENABLE);
}
uint8_t I2C_SendData(uint8_t slaveAddr, uint8_t* buffer, uint8_t length)
{
uint32_t timeout = I2C_TIMEOUT;
uint8_t status;
// 发送起始信号
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
{
if (--timeout == 0)
return I2C_ERROR_TIMEOUT;
}
// 发送从设备地址
I2C_Send7bitAddress(I2C1, slaveAddr, I2C_Direction_Transmitter);
timeout = I2C_TIMEOUT;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if (--timeout == 0)
return I2C_ERROR_TIMEOUT;
}
// 发送数据
for (int i = 0; i < length; i++)
{
I2C_SendData(I2C1, buffer[i]);
timeout = I2C_TIMEOUT;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if (--timeout == 0)
return I2C_ERROR_TIMEOUT;
}
}
// 发送停止信号
I2C_GenerateSTOP(I2C1, ENABLE);
return I2C_ERROR_NONE;
}
int main(void)
{
uint8_t data[] = {0x01, 0x02, 0x03};
uint8_t result = I2C_SendData(0x50, data, sizeof(data));
while (1);
}
```
需要注意的是,I2C通信中的从设备地址需要根据实际情况修改。