要求STM32F1【标准库版本示例
时间: 2023-09-09 16:11:44 浏览: 58
以下是一个使用STM32F1标准库版本的示例代码,演示如何使用PCA9548A进行I2C多路复用:
```c
#include "stm32f10x.h"
#include "stm32f10x_i2c.h"
#define I2C_PORT GPIOB
#define SCL_PIN GPIO_Pin_6
#define SDA_PIN GPIO_Pin_7
#define PCA9548A_ADDRESS 0x70
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
// Enable I2C and GPIO clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// Configure I2C GPIO pins
GPIO_InitStructure.GPIO_Pin = SCL_PIN | SDA_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(I2C_PORT, &GPIO_InitStructure);
// Configure I2C
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000; // 100 kHz
I2C_Init(I2C1, &I2C_InitStructure);
// Enable I2C
I2C_Cmd(I2C1, ENABLE);
}
void PCA9548A_SelectChannel(uint8_t channel)
{
uint8_t command = (1 << channel);
// Start I2C transmission
I2C_GenerateSTART(I2C1, ENABLE);
// Wait until I2C bus is free
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
// Send PCA9548A address
I2C_Send7bitAddress(I2C1, PCA9548A_ADDRESS << 1, I2C_Direction_Transmitter);
// Wait until address is sent
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
// Send channel selection command
I2C_SendData(I2C1, command);
// Wait until transmission is complete
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Stop I2C transmission
I2C_GenerateSTOP(I2C1, ENABLE);
}
int main(void)
{
// Initialize I2C
I2C_Configuration();
// Select channel 0 (for example)
PCA9548A_SelectChannel(0);
while(1)
{
// Your application code here
}
}
```
请注意,这只是一个示例代码,并且可能需要根据您的具体硬件和需求进行适当的修改。确保根据您的STM32F1型号和引脚配置进行适配,并根据PCA9548A的地址和通道选择规则进行设置。