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STM32 模擬IIC協議驅動TEA5767

作者：時間：2016-12-02 來源：網絡

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IIC驅動程序參考自《ALIENTEK MINISTM32 實驗16 IIC實驗》，做了簡單的修改就輕易驅動TEA5767。至于TEA5767內部寄存器的配置就不說了。看程序：

文件：I2C_Driver.h

#ifndef __I2C_Driver_H

#define __I2C_Driver_H

#define uchar unsigned char

#define uint unsigned short int

#define ulint unsigned int

#define delay_nus 2

//IO方向設置

#define SDA_IN() {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=8<<12;}//

#define SDA_OUT() {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=3<<12;}

//IO操作函數

#define IIC_SCL PBout(10) //SCL

#define IIC_SDA PBout(11) //SDA

#define READ_SDA PBin(11) //輸入SDA

//IIC所有操作函數

void IIC_Init(void); //初始化IIC的IO口

void IIC_Start(void); //發送IIC開始信號

void IIC_Stop(void); //發送IIC停止信號

void IIC_Send_Byte(uchar txd); //IIC發送一個字節

uchar IIC_Read_Byte(unsigned char ack);//IIC讀取一個字節

uchar IIC_Wait_Ack(void); //IIC等待ACK信號

void IIC_Ack(void); //IIC發送ACK信號

void IIC_NAck(void); //IIC不發送ACK信號

void IIC_Write_One_Byte(uchar daddr,uchar addr,uchar data);

uchar IIC_Read_One_Byte(uchar daddr,uchar addr);

void Write_TEA5767(void);

void Read_TEA5767(void);

void TEA5767(void);

void Radio_Set_Frequency(void);

void Radio_Manual_Search(void);

void Radio_Search (void);

void Radio_Power_Display(void);

void Radio_Frequency_Display(void);

#endif

文件：I2C_Driver.c

#include "I2C_Driver.h"

#include "GUI.h"

#include "enhance.h"

uchar ack_cnt=0;

void delay_us(uint t)

{

t=72*t;

while(t-->0);

}

//初始化IIC

void IIC_Init(void)

{

RCC->APB2ENR|=1<<3;//先使能外設IO PORTB時鐘

GPIOB->CRH&=0XFFFF00FF;//PB10/11 推挽輸出

GPIOB->CRH|=0X00003300;

GPIOB->ODR|=3<<10; //PB10/11 輸出高

}

//產生IIC起始信號

void IIC_Start(void)

{

SDA_OUT(); //sda線輸出

IIC_SDA=1;

IIC_SCL=1;

delay_us(delay_nus);

IIC_SDA=0;//START:when CLK is high,DATA change form high to low

delay_us(delay_nus);

IIC_SCL=0;//鉗住I2C總線，準備發送或接收數據

}

//產生IIC停止信號

void IIC_Stop(void)

{

SDA_OUT();//sda線輸出

IIC_SCL=0;

IIC_SDA=0;//STOP:when CLK is high DATA change form low to high

delay_us(delay_nus);

IIC_SCL=1;

IIC_SDA=1;//發送I2C總線結束信號

delay_us(delay_nus);

}

//等待應答信號到來

//返回值：1，接收應答失敗

// 0，接收應答成功

uchar IIC_Wait_Ack(void)

{

uchar ucErrTime=0;

SDA_IN(); //SDA設置為輸入

IIC_SDA=1;delay_us(delay_nus);

IIC_SCL=1;delay_us(delay_nus);

while(READ_SDA)

{

ucErrTime++;

if(ucErrTime>250)

{

IIC_Stop();

return 1;

}

IIC_SCL=0;//時鐘輸出0

ack_cnt++;

return 0;

}

//產生ACK應答

void IIC_Ack(void)

{

IIC_SCL=0;

SDA_OUT();

IIC_SDA=0;

delay_us(delay_nus);

IIC_SCL=1;

delay_us(delay_nus);

IIC_SCL=0;

}

//不產生ACK應答

void IIC_NAck(void)

{

IIC_SCL=0;

SDA_OUT();

IIC_SDA=1;

delay_us(delay_nus);

IIC_SCL=1;

delay_us(delay_nus);

IIC_SCL=0;

}

//IIC發送一個字節

//返回從機有無應答

//1，有應答

//0，無應答

void IIC_Send_Byte(uchar txd)

{

uchar t;

SDA_OUT();

IIC_SCL=0;//拉低時鐘開始數據傳輸

for(t=0;t<8;t++)

{

IIC_SDA=(txd&0x80)>>7;

txd<<=1;

delay_us(delay_nus); //對TEA5767這三個延時都是必須的

IIC_SCL=1;

delay_us(delay_nus);

IIC_SCL=0;

delay_us(delay_nus);

}

//讀1個字節，ack=1時，發送ACK，ack=0，發送nACK

uchar IIC_Read_Byte(unsigned char ack) //

{

unsigned char i,receive=0;

SDA_IN();//SDA設置為輸入

for(i=0;i<8;i++ )

{

delay_us(2);

IIC_SCL=1;

receive<<=1;

delay_us(2);

if(READ_SDA)receive++;

IIC_SCL=0;

}

if (!ack)

IIC_NAck();//發送nACK

else

IIC_Ack(); //發送ACK

return receive;

}

///////////////TEA5767/////////////////////

#define W_TEA5767 0xc0

#define R_TEA5767 0xc1

unsigned char Radio_Read_Buf[5]="12345";

unsigned char Radio_Write_Buf[5]={0x2a,0xb6,0x40,0x17,0x40}; //要寫入TEA5767的數據

#define Max_frequency 108000

#define Min_frequency 87500

#define Mute_On 1

#define Mute_Off 0

unsigned long Frequency_Write=93600;

unsigned long Frequency_Read=0;

unsigned long pll=0;

unsigned char Search_Mode_Flag=0,Radio_On_Flag=0;//Search_Over=0;

static unsigned char Radio_Search_Flag=0;

unsigned char Radio_Mute=Mute_Off;

void Write_TEA5767(void)

{

uchar i=0;

delay_us(0);

IIC_Start();

IIC_Send_Byte(W_TEA5767);

if(!IIC_Wait_Ack())

{

for(i=0;i<5;i++)

{

IIC_Send_Byte(Radio_Write_Buf[i]);

if(IIC_Wait_Ack())

{

GUI_DispStringAt("Write buffer Failed !",10,100);

break;

}

else

{

GUI_DispStringAt("Failed !",10,80);

}

IIC_Stop();

}

void Read_TEA5767(void)

{

uchar i=0;

IIC_Start();

IIC_Send_Byte(0xc1);

if (!IIC_Wait_Ack()) //chip addr of read data

{

for (i=0;i<5;i++)

Radio_Read_Buf[i] =(i==4)? IIC_Read_Byte(0):IIC_Read_Byte(1); //the last byte with ACK.

IIC_Stop();

// GUI_DispStringAt("Read TEA5767 Completed !",10,100);

}

else IIC_Stop();

pll=(Radio_Read_Buf[0]&0x3f)*256+Radio_Read_Buf[1]+1; ////!!!!! +1

if(Radio_Write_Buf[2]&0x10)

{

Frequency_Read=pll*8192-225000;

}

else

{

Frequency_Read=pll*8192+225000;

}

void Radio_Set_Frequency(void)

{

if(Radio_Write_Buf[2]&0x10)

{

pll=(((Frequency_Write*1000)+225000)*4)/32768;

}

else

{

pll=(((Frequency_Write*1000)-225000)*4)/32768;//本例為低邊帶接收方式

}

Radio_Write_Buf[0] = pll/256;

Radio_Write_Buf[1] = pll%256;

Radio_Write_Buf[0]&= 0x3F;//不靜音不搜索

if(Radio_Mute==Mute_On)

Radio_Write_Buf[0]|=0x80;//

else

Radio_Write_Buf[0]&=0x7f;//

Radio_Write_Buf[2] = 0x00;

Radio_Write_Buf[3] = 0x12;

Radio_Write_Buf[4] = 0x00;

Write_TEA5767();

}

void Radio_Manual_Search(void)

{

if(Search_Mode_Flag)

{

Frequency_Write+=100; //步進100KHZ

if(Frequency_Write>Max_frequency)

{

Frequency_Write=Min_frequency;

}

else

{

Frequency_Write-=100;

if(Frequency_Write

{

Frequency_Write=Max_frequency;

}

Radio_Set_Frequency();

}

void Radio_Search (void)

{

switch(Radio_Search_Flag)

{

case 0:

{

Radio_Mute=Mute_On; //靜音打開

Radio_Manual_Search();

Radio_Search_Flag=1;

}

case 1:

{

unsigned char Radio_If;

// _delay_ms(100);

Read_TEA5767();

Radio_If=Radio_Read_Buf[2]&0x7f;

if((Radio_Read_Buf[3]>>4)>4) //ADC大于4停止

{

if((Radio_If>0x30)&&(Radio_If<0x3a)) //比較IF

{

Radio_On_Flag=0; //關閉搜索

Radio_Write_Buf[0]&=0x7f; //靜音關閉

Write_TEA5767();

}

Radio_Search_Flag=0;

}

else //ADC小于4繼續

{

Radio_Search_Flag=0;

}

Radio_Frequency_Display();

Radio_Power_Display();

}

void Radio_Power_Display(void)

{

unsigned char Temp;

Temp = (Radio_Read_Buf[3]>>4);//RF信號強度ADC

GUI_GotoXY(140,0);

GUI_DispString("RF:");

GUI_DispDec(Temp,2);

Temp = (Radio_Read_Buf[2]&0x7f);//中頻計數結果，正確調諧時在【0x31,0x3e】之間

GUI_GotoXY(200,0);

GUI_DispString("IF:");

GUI_DispHex(Temp,2);

if((Temp>=0x31)&&(Temp<=0x3e))

GUI_DispStringAt("Good",200,20);

else

GUI_DispStringAt("Bad ",200,20);

}

void Radio_Frequency_Display(void)

{

char Display_Bit[9]="000.0MHz ";

Frequency_Read=Frequency_Read/1000;

Display_Bit[0] = Frequency_Read / 100000;

if ( Display_Bit[0] == 0 )

{

Display_Bit[0] = 0;

}

else

{

Display_Bit[0] += 0x30;

}

Display_Bit[1] = (Frequency_Read/ 10000)%10 +0x30;

Display_Bit[2] = (Frequency_Read/ 1000)%10 +0x30;

Display_Bit[4] = (Frequency_Read / 100)%10 +0x30;

GUI_DispStringAt(Display_Bit,140,20);

}

void TEA5767(void)

{

static uchar i=0;

if(!i)

{

IIC_Init();

delay_us(0);

IIC_Stop();

i++;

Frequency_Write= 93600;

Radio_Set_Frequency();

}

Read_TEA5767();

Radio_Frequency_Display();

Radio_Power_Display();

GUI_GotoXY(10,0);

GUI_DispString("W:");

TFT_DispHexStringAt(6*2+10,0 ,Radio_Write_Buf,5);

GUI_GotoXY(10,20);

GUI_DispString("R:");

TFT_DispHexStringAt(6*2+10,20,Radio_Read_Buf ,5);

// GUI_DispDecAt(ack_cnt,10,40,3);

}

////////////////////////////////////////////

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