IIC驱动程序参阅自《ALIENTEK MINISTM32 试验16 IIC试验》，做了简略的修正就容易驱动TEA5767。至于TEA5767内部寄存器的装备就不说了。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方向设置
#define SDA_IN() {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=8<<12;}//
#define SDA_OUT() {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=3<<12;}
//IO操作函数
#define IIC_SCL PBout(10) //SCL
#define IIC_SDA PBout(11) //SDA
#define READ_SDA PBin(11) //输入SDA
//IIC一切操作函数
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;//先使能外设IO PORTB时钟
GPIOB->CRH&=0XFFFF00FF;//PB10/11 推挽输出
GPIOB->CRH|=0X00003300;
GPIOB->ODR|=3<<10; //PB10/11 输出高
}
//发生IIC起始信号
void IIC_Start(void)
{
SDA_OUT(); //sda线输出
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;//钳住I2C总线，预备发送或接纳数据
}
//发生IIC中止信号
void IIC_Stop(void)
{
SDA_OUT();//sda线输出
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;//发送I2C总线完毕信号
delay_us(delay_nus);
}
//等候应对信号到来
//回来值：1，接纳应对失利
// 0，接纳应对成功
uchar IIC_Wait_Ack(void)
{
uchar ucErrTime=0;
SDA_IN(); //SDA设置为输入
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;//时钟输出0
ack_cnt++;
return 0;
}
//发生ACK应对
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;
}
//不发生ACK应对
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发送一个字节
//回来从机有无应对
//1，有应对
//0，无应对
void IIC_Send_Byte(uchar txd)
{
uchar t;
SDA_OUT();
IIC_SCL=0;//拉低时钟开端数据传输
for(t=0;t<8;t++)
{
IIC_SDA=(txd&0x80)>>7;
txd<<=1;
delay_us(delay_nus); //对TEA5767这三个延时都是有必要的
IIC_SCL=1;
delay_us(delay_nus);
IIC_SCL=0;
delay_us(delay_nus);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
uchar IIC_Read_Byte(unsigned char ack) //
{
unsigned char i,receive=0;
SDA_IN();//SDA设置为输入
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();//发送nACK
else
IIC_Ack(); //发送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}; //要写入TEA5767的数据
#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++)
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;//本例为低边带接纳方法
}
Radio_Write_Buf[0] = pll/256;
Radio_Write_Buf[1] = pll%256;
Radio_Write_Buf[0]&= 0x3F;//不静音不查找
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; //步进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; //静音翻开
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中止
{
if((Radio_If>0x30)&&(Radio_If<0x3a)) //比较IF
{
Radio_On_Flag=0; //封闭查找
Radio_Write_Buf[0]&=0x7f; //静音封闭
Write_TEA5767();
}
Radio_Search_Flag=0;
}
else //ADC小于4持续
{
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信号强度ADC
GUI_GotoXY(140,0);
GUI_DispString(“RF:”);
GUI_DispDec(Temp,2);
Temp = (Radio_Read_Buf[2]&0x7f);//中频计数成果，正确调谐时在【0x31,0x3e】之间
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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