使用寄存器版本编写STM32f103ZET6的硬件IIC并设置为从模式
时间: 2023-05-27 17:06:21 浏览: 84
以下是使用寄存器版本编写STM32f103ZET6的硬件IIC并设置为从模式的代码:
```c
#include "stm32f10x.h"
#define I2C_SLAVE_ADDRESS 0x50
void i2c_init(void)
{
// Enable I2C1 clock
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN;
// Configure GPIOB pins for I2C1
RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;
GPIOB->CRL |= (GPIO_CRL_MODE6 | GPIO_CRL_MODE7); // Output mode, max speed 50 MHz
GPIOB->CRL &= ~(GPIO_CRL_CNF6 | GPIO_CRL_CNF7); // Alternate function, open-drain
GPIOB->ODR |= GPIO_ODR_ODR6 | GPIO_ODR_ODR7; // Set high
// Configure I2C1
I2C1->CR1 &= ~I2C_CR1_PE; // Disable I2C1
I2C1->CR1 &= ~I2C_CR1_ANFOFF; // Enable analog noise filter
I2C1->CR1 &= ~I2C_CR1_DNF; // Digital noise filter = 0
I2C1->CR1 &= ~I2C_CR1_ERRIE; // Disable error interrupt
I2C1->CR1 &= ~I2C_CR1_NOSTRETCH; // Enable clock stretching
I2C1->CR2 &= ~I2C_CR2_FREQ; // Clear frequency bits
I2C1->CR2 |= 36; // Set frequency to 36 MHz
I2C1->OAR1 &= ~I2C_OAR1_OA1EN; // Disable own address 1
I2C1->OAR2 &= ~I2C_OAR2_OA2EN; // Disable own address 2
I2C1->OAR1 |= (I2C_SLAVE_ADDRESS << 1); // Set own address 1
I2C1->OAR1 |= I2C_OAR1_OA1EN; // Enable own address 1
I2C1->CR1 |= I2C_CR1_PE; // Enable I2C1
}
int main(void)
{
i2c_init();
while (1) {
// TODO: Implement I2C slave functionality
}
return 0;
}
```
在此示例中,我们使用STM32的I2C1接口,将其配置为从模式,并将从地址设置为0x50。我们使用GPIOB的6号和7号引脚作为I2C时钟和数据线。在初始化期间,我们设置了I2C的时钟频率、数字和模拟滤波器以及从地址。我们还开启了I2C1时钟,并将GPIOB的引脚配置为I2C模式。在主循环中,我们可以添加I2C从模式的功能代码。