140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
#include "myiic.h"
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//////////////////////////////////////////////////////////////////////////////////
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//本程序只供学习使用，未经作者许可，不得用于其它任何用途
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//ALIENTEK STM32F429开发板
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//IIC驱动代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//创建日期:2016/1/13
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//版本：V1.0
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//版权所有，盗版必究。
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//Copyright(C) 广州市星翼电子科技有限公司 2014-2024
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//All rights reserved
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//////////////////////////////////////////////////////////////////////////////////
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//IIC初始化
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void IIC_Init(void)
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOH_CLK_ENABLE(); //使能GPIOH时钟
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//PH4,5初始化设置
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GPIO_Initure.Pin=GPIO_PIN_4|GPIO_PIN_5;
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GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP; //推挽输出
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GPIO_Initure.Pull=GPIO_PULLUP; //上拉
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GPIO_Initure.Speed=GPIO_SPEED_FAST; //快速
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HAL_GPIO_Init(GPIOH,&GPIO_Initure);
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IIC_SDA=1;
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IIC_SCL=1;
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}
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//产生IIC起始信号
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void IIC_Start(void)
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{
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SDA_OUT(); //sda线输出
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IIC_SDA=1;
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IIC_SCL=1;
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delay_us(4);
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IIC_SDA=0;//START:when CLK is high,DATA change form high to low
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delay_us(4);
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IIC_SCL=0;//钳住I2C总线，准备发送或接收数据
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}
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//产生IIC停止信号
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void IIC_Stop(void)
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{
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SDA_OUT();//sda线输出
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IIC_SCL=0;
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IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
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delay_us(4);
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IIC_SCL=1;
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delay_us(4);
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IIC_SDA=1;//发送I2C总线结束信号
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}
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//等待应答信号到来
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//返回值：1，接收应答失败
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// 0，接收应答成功
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uint8_t IIC_Wait_Ack(void)
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{
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uint8_t ucErrTime=0;
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SDA_IN(); //SDA设置为输入
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IIC_SDA=1;delay_us(1);
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IIC_SCL=1;delay_us(1);
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while(READ_SDA)
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{
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ucErrTime++;
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if(ucErrTime>250)
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{
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IIC_Stop();
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return 1;
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}
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}
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IIC_SCL=0;//时钟输出0
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return 0;
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}
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//产生ACK应答
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void IIC_Ack(void)
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{
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IIC_SCL=0;
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SDA_OUT();
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IIC_SDA=0;
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delay_us(2);
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IIC_SCL=1;
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delay_us(2);
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IIC_SCL=0;
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}
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//不产生ACK应答
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void IIC_NAck(void)
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{
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IIC_SCL=0;
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SDA_OUT();
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IIC_SDA=1;
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delay_us(2);
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IIC_SCL=1;
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delay_us(2);
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IIC_SCL=0;
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}
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//IIC发送一个字节
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//返回从机有无应答
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//1，有应答
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//0，无应答
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void IIC_Send_Byte(uint8_t txd)
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{
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uint8_t t;
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SDA_OUT();
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IIC_SCL=0;//拉低时钟开始数据传输
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for(t=0;t<8;t++)
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{
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IIC_SDA=(txd&0x80)>>7;
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txd<<=1;
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delay_us(2); //对TEA5767这三个延时都是必须的
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IIC_SCL=1;
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delay_us(2);
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IIC_SCL=0;
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delay_us(2);
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}
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}
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//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
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uint8_t IIC_Read_Byte(unsigned char ack)
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{
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unsigned char i,receive=0;
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SDA_IN();//SDA设置为输入
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for(i=0;i<8;i++ )
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{
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IIC_SCL=0;
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delay_us(2);
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IIC_SCL=1;
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receive<<=1;
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if(READ_SDA)receive++;
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delay_us(1);
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}
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if (!ack)
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IIC_NAck();//发送nACK
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else
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IIC_Ack(); //发送ACK
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return receive;
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}
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