iic-RAD5820-STC15单片机驱动程序 -

#define MAIN_Fosc 24000000UL //24M
#include "STC15Fxxxx.H"
#include <i2c.h>
/*I2C interface
sbit SCL = P1^5;
sbit SDA = P1^6;*/
//clk out STC --> RDA SUPORT 32.768KHz/12M/24M/13M/26M/19.2/38.4M
sbit RCLK = P5^4; //RST /SysClk0 /SS_3 /CMP+ RDA5820clk 12M
//HID interface
sbit VOICE = P2^3; //HZ 1S/ TIME 3S
sbit BACK = P0^4; //BACK 1S/ VOL- 3S
sbit NEXT = P5^2; //NEXT 1S/ VOL+ 3S
/*i2c
#define max_freq 108000
#define min_freq 87500*/
unsigned char RDA_rest[3]={0x02,0x00,0x02,}; //要写入RDA5820的数据
unsigned char radio_write_data[3]={0x02,0x00,0x02,};
//unsigned char radio_write_data[5]={0x2a,0xb6,0x40,0x11,0x40}; //要写入TEA5767的数据
unsigned char radio_read_data[5]; //TEA5767读出的状态
unsigned int default_pll=0x301d; //0x29f9; //默认存台的pll,95.8MHz
//unsigned int max_pll=0x339b; //108MHz时的pll,
//unsigned int min_pll=9000; //70MHz时的pll
unsigned long frequency;
unsigned int pll;
/*void delay(unsigned int time)
{
while(time--);
}*/
void delay1ms (unsigned int b)//1ms
{
for(b;b>0;b--)
{unsigned int i;
for(i=0;i<300;i++)
{;}
}
}
void radio_write(void)
{
unsigned char i;
iic_start();
iic_write8bit(0x22); //RDA5820写地址
if(!iic_testack())
{
for(i=0;i<3;i++)
{
iic_write8bit(radio_write_data[i]);
iic_ack();
}
}
iic_stop();
}
//由频率计算PLL
void get_pll(void)
{
unsigned char hlsi;
// unsigned int twpll=0;
hlsi=radio_write_data[2]&0x10; //HLSI位
if (hlsi)
pll=(unsigned int)((float)((frequency+225)*4)/(float)32.768); //频率单位:k
else
pll=(unsigned int)((float)((frequency-225)*4)/(float)32.768); //频率单位:k
}
//由PLL计算频率
void get_frequency(void)
{
unsigned char hlsi;
unsigned int npll=0;
npll=pll;
hlsi=radio_write_data[2]&0x10;
if (hlsi)
frequency=(unsigned long)((float)(npll)*(float)8.192-225); //频率单位:KHz
else
frequency=(unsigned long)((float)(npll)*(float)8.192+225); //频率单位:KHz
}
//读TEA5767状态,并转换成频率
void radio_read(void)
{
unsigned char i;
unsigned char temp_l,temp_h;
pll=0;
iic_start();
iic_write8bit(0x23); //RDA5820读地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
radio_read_data[i]=iic_read8bit();
iic_ack();
}
}
iic_stop();
temp_l=radio_read_data[1];
temp_h=radio_read_data[0];
temp_h&=0x3f;
pll=temp_h*256+temp_l;
get_frequency();
}
/*
//手动设置频率,mode=1,+0.1MHz; mode=0:-0.1MHz ,不用考虑TEA5767用于搜台的相关位:SM,SUD
void search(bit mode)
{
radio_read();
if(mode)
{
frequency+=10;
if(frequency>max_freq)
frequency=min_freq;
}
else
{
frequency-=10;
if(frequency<min_freq)
frequency=max_freq;
}
get_pll();
radio_write_data[0]=pll/256;
radio_write_data[1]=pll%256;
radio_write_data[2]=0x20;
radio_write_data[3]=0x11;
radio_write_data[4]=0x00;
radio_write();
}*/
//自动搜台,mode=1,频率增加搜台; mode=0:频率减小搜台,不过这个好像不能循环搜台
void auto_search(bit mode)
{
radio_read();
get_pll();
if(mode)
radio_write_data[2]=0xa0;
else
radio_write_data[2]=0x20;
radio_write_data[0]=pll/256+0x40;
radio_write_data[1]=pll%256;
radio_write_data[2]=0x20; //...
radio_write_data[3]=0x11;
radio_write_data[4]=0x00;
radio_write();
radio_read();
while(!(radio_read_data[0]&0x80)) //搜台成功标志
{
delay1ms(1000);
radio_read();
//disp_freq(9,1);
}
}
void main()
{
/*P0M1 = 0; P0M0 = 0;
P1M1 = 0; P1M0 = 0;
P2M1 = 0; P2M0 = 0;
P3M1 = 0; P3M0 = 0;
P4M1 = 0; P4M0 = 0;
P5M1 = 0; P5M0 = 0;
P6M1 = 0; P6M0 = 0;
P7M1 = 0; P7M0 = 0; */
radio_write();
while(1)
{
if(NEXT==0)
{
delay1ms(15); //延时15ms
if(NEXT==0)
while(NEXT==0);//等待按键释放
auto_search(1);
radio_read();
}
if(BACK==0)
{
delay1ms(15); //延时15ms
if(BACK==0)
while(BACK==0);//等待按键释放
auto_search(0);
radio_read();
}
}
}

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