基于51单片机的数控收音机（RDA5807程序） -

#include "iic.h"
#include "reg51.h"
#include "delay.h"
#include "radio.h"
#include "24c02.h"
#define uchar unsigned char
#define uint unsigned int
extern uchar data Display_FM[8];
extern uchar data Display_Vol[6];
sbit K1 = P3^2;
sbit K2 = P3^3;
sbit K3 = P3^4;
sbit K4 = P3^5;
unsigned long frequency;
unsigned char RDA_reg_data[8] =
{
0xd0,0x00, // 02H
0x00,0x00, // 03H
0x00,0x40, // 04H
0x90,0x80, // 05H
};
char code reserve[3]_at_ 0x3b; // //保留0x3b开始的3个字节
void RDA5807_write_reg(void)
{
uchar i;
I2C_start(); //收音模块写入操作
I2C_write_byte(0x20);
for(i=0; i<8; i++)
{
I2C_write_byte(RDA_reg_data[i]);
}
I2C_stop();
}
void RDA5807_read_reg(uchar *reg_buf) //连续读寄存器子函数
{
I2C_start();
I2C_write_byte(0x21); //寄存器连续读操作
reg_buf[0] = I2C_read_byte(0);
reg_buf[1] = I2C_read_byte(0);
reg_buf[2] = I2C_read_byte(0);
reg_buf[3] = I2C_read_byte(1);
I2C_stop();
}
void RDA5807_power(void) //模块上电初始化子函数
{
Delay_ms(50);
RDA_reg_data[0] = 0x00; //发送软件复位指令
RDA_reg_data[1] = 0x02;
RDA5807_write_reg();
Delay_ms(10);
RDA_reg_data[0] = 0xd0; //收音模块默认参数
RDA_reg_data[1] = 0x01;
a24c02_read();//读取保存的频率
RDA_reg_data[3] += 0x10; //调谐启用
RDA5807_write_reg();
}
void RDA5807_FM_seek(void) //功能描述：收音模块自动寻台模式
{
uint chan;
uchar reg_data[4] = {0x00, 0x00, 0x00, 0x00};
RDA_reg_data[3] &= ~(1 << 4); //调谐禁用内部自动寻台使
RDA_reg_data[0] |= (1 << 0); //SEEK位置 1
RDA5807_write_reg();
while(0 == (reg_data[0] & 0x40)) //等待 STC 标志置位
{
Delay_ms(20);
RDA5807_read_reg(reg_data); //读取内部状态
}
chan = reg_data[0] & 0x03; //获取当前工作频点
chan = reg_data[1] | (chan << 8);
chan = chan << 6;
RDA_reg_data[2] = (chan >> 8) & 0xff; //保存当前工作频点
RDA_reg_data[3] = (chan & 0xff);
a24c02_write();//保存当前频率
}
void show_frequency(void) //频率显示子函数
{
unsigned char i;
unsigned int temp;
temp = (RDA_reg_data[2]*256)+(RDA_reg_data[3]&0xc0); //计算
temp = temp>>6;
frequency = (unsigned long)(100*temp+87000)/100;
for(i=0; i<5; i++)
Display_FM[i] = 0x00; //清显存单元
Display_FM[0] = (frequency)/1000 ; //数据转换
Display_FM[1] = (frequency%1000)/100;
Display_FM[2] = (frequency%100)/10;
Display_FM[3] = 0x2e;//小数点
Display_FM[4] = (frequency%10);
if( Display_FM[0] == 0)
{
Display_FM[0] = Display_FM[1]+0x30;
Display_FM[1] = Display_FM[2]+0x30;
Display_FM[2] = Display_FM[3];
Display_FM[3] = Display_FM[4]+0x30;
Display_FM[4] = 0x20;
}
else
{
Display_FM[0] += 0x30;
Display_FM[1] += 0x30;
Display_FM[2] += 0x30;
Display_FM[4] += 0x30;
}
}
void show_volume()//音量显示子函数
{
unsigned char temp;
temp = RDA_reg_data[7] & 0x0f; //取音量值
Display_Vol[3] = temp/10;
Display_Vol[4] = temp%10;
if(Display_Vol[3] == 0)// 如果高位为0
{
Display_Vol[3] = Display_Vol[4]; //低位显存内容进入高位显存
Display_Vol[4] = 0x20;//低位不显示
}
else
Display_Vol[4] += 0x30;
Display_Vol[3] += 0x30;
}
void Set_Frq() //按键设置
{
if(K1 == 0)
{
Delay_ms(20);
if(K1 == 0)
{
RDA_reg_data[0] |= (1 << 1); //SEEK UP
RDA5807_FM_seek();
while(K1 == 0);
}
}
if(K2 == 0)
{
Delay_ms(20);
if(K2 == 0)
{
RDA_reg_data[0] &= ~(1 << 1); //SEEK DOWN
RDA5807_FM_seek();
while(K2 == 0);
}
}
if(K3 == 0)
{
Delay_ms(20);
if(K3 == 0)
{
if((RDA_reg_data[7] & 0x0f) < 0x0f)
{
RDA_reg_data[0] = 0xd0;
RDA_reg_data[1] = 0x01;
RDA_reg_data[3] &= ~(1 << 4);
RDA_reg_data[7]++; //音量递增
RDA5807_write_reg();
while(K3 == 0);
}
}
}
if(K4 == 0)
{
Delay_ms(20);
if(K4 == 0)
{
if((RDA_reg_data[7] & 0x0f) > 0x00)
{
RDA_reg_data[0] = 0xd0;
RDA_reg_data[1] = 0x01;
RDA_reg_data[3] &= ~(1 << 4);
RDA_reg_data[7]--; //音量递减
RDA5807_write_reg();
while(K4 == 0);
}
}
}
}

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