stm32f103 IIC代码
时间: 2023-05-17 15:07:00 浏览: 49
以下是一个简单的 STM32F103 IIC 代码示例:
#include "stm32f10x.h"
#define I2C_SPEED 100000 // I2C 速度为 100kHz
#define I2C_SLAVE_ADDRESS 0xA0 // 从机地址为 0xA0
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
// 使能 I2C 和 GPIO 时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// 配置 I2C_SCL 和 I2C_SDA 引脚为复用推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 配置 I2C
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVE_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
I2C_Init(I2C1, &I2C_InitStructure);
// 使能 I2C
I2C_Cmd(I2C1, ENABLE);
}
int main(void)
{
uint8_t data[] = {0x01, 0x02, 0x03};
uint8_t buffer[3];
uint8_t i;
// 配置 I2C
I2C_Configuration();
// 发送数据
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, I2C_SLAVE_ADDRESS, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
for (i = 0; i < 3; i++) {
I2C_SendData(I2C1, data[i]);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
I2C_GenerateSTOP(I2C1, ENABLE);
// 接收数据
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, I2C_SLAVE_ADDRESS, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
for (i = 0; i < 3; i++) {
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
buffer[i] = I2C_ReceiveData(I2C1);
}
I2C_GenerateSTOP(I2C1, ENABLE);
// 验证数据
for (i = 0; i < 3; i++) {
if (buffer[i] != data[i]) {
// 数据错误
while (1);
}
}
// 数据正确
while (1);
}
请注意,这只是一个简单的示例代码,实际应用中可能需要根据具体情况进行修改和优化。