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156 lines
3.2 KiB
156 lines
3.2 KiB
#include "bsp_i2c.h"
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#ifdef USE_I2C
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#include "bsp_pin.h"
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uint8_t D[4] = {0};
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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_GPIOB_CLK_ENABLE(); //使能GPIOB时钟
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//PB6,7初始化设置
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GPIO_Initure.Pin=GPIO_PIN_6|GPIO_PIN_7;
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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_HIGH; //高速
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HAL_GPIO_Init(GPIOB,&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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IIC_SDA(1);//发送I2C总线结束信号
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delay_us(4);
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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(uint8_t ack)
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{
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uint8_t 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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uint8_t PCF8591_ADC_Input(uint8_t WriteAddr, uint8_t Channel)
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{
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uint8_t temp = 0;
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IIC_Start();
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IIC_Send_Byte(WriteAddr);
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IIC_Wait_Ack();
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IIC_Send_Byte(Channel);
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IIC_Wait_Ack();
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IIC_Stop();
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IIC_Start();
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IIC_Send_Byte(WriteAddr | 0x01);
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IIC_Wait_Ack();
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temp = IIC_Read_Byte(0);
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IIC_Stop();
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return temp;
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}
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void IIC_TEST(void)
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{
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D[0] = PCF8591_ADC_Input(PCF8591,0x40);
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D[1] = PCF8591_ADC_Input(PCF8591,0x41);
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D[2] = PCF8591_ADC_Input(PCF8591,0x42);
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D[3] = PCF8591_ADC_Input(PCF8591,0x43);
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printf("%d\t%d\t%d\t%d\r\n", D[0], D[1], D[2], D[3]);
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}
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#endif
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