AT32F421 IIC接收例程
时间: 2023-08-15 16:05:30 浏览: 57
下面是AT32F421 IIC接收的示例代码,仅供参考:
```c
#include "at32f4xx.h"
#include "at32_board.h"
#define I2C_SLAVE_ADDRESS 0x50
void I2C_Configuration(void)
{
GPIO_InitType GPIO_InitStructure;
I2C_InitType I2C_InitStructure;
/* enable I2C1 and GPIOB clock */
RCC_APB1PeriphClockCmd(RCC_APB1PERIPH_I2C1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_GPIOB, ENABLE);
/* Configure I2C1 pins: SCL and SDA */
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_6 | GPIO_Pins_7;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* I2C1 configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2CDevice;
I2C_InitStructure.I2C_FmDutyCycle = I2C_FmDutyCycle_2_1;
I2C_InitStructure.I2C_OwnAddress = I2C_SLAVE_ADDRESS;
I2C_InitStructure.I2C_Speed = 100000;
I2C_Init(I2C1, &I2C_InitStructure);
/* Enable I2C1 */
I2C_Cmd(I2C1, ENABLE);
}
uint8_t I2C_ReadData(uint8_t SlaveAddress, uint8_t RegisterAddress)
{
uint8_t result = 0;
/* wait until I2C is not busy */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BusBusy));
/* send start condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* wait until start condition is generated */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* send slave address */
I2C_Send7bitAddress(I2C1, SlaveAddress, I2C_Direction_Transmitter);
/* wait until address is sent */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* send register address */
I2C_SendData(I2C1, RegisterAddress);
/* wait until data is sent */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* send start condition again */
I2C_GenerateSTART(I2C1, ENABLE);
/* wait until start condition is generated */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* send slave address again */
I2C_Send7bitAddress(I2C1, SlaveAddress, I2C_Direction_Receiver);
/* wait until address is sent */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
/* disable ACK */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* wait until data is received */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
/* read data */
result = I2C_ReceiveData(I2C1);
/* send stop condition */
I2C_GenerateSTOP(I2C1, ENABLE);
/* wait until stop condition is generated */
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_StopDetect));
/* enable ACK */
I2C_AcknowledgeConfig(I2C1, ENABLE);
return result;
}
int main(void)
{
uint8_t data = 0;
/* configure I2C1 */
I2C_Configuration();
/* read data from slave device */
data = I2C_ReadData(I2C_SLAVE_ADDRESS, 0x00);
while (1)
{
/* do something with data */
/* ... */
}
}
```
这是一个简单的I2C接收例程,其中I2C_ReadData()函数用于从I2C从设备读取数据。在主函数中,首先需要调用I2C_Configuration()函数配置I2C通信参数。然后,通过调用I2C_ReadData()函数从指定的从设备读取数据。最后,可以对读取到的数据进行处理。