ATMEGA8单片机控制的TEA5767高性能FM收音机-制作DIY - 圣源电子制作

// WINAVR GCC
// ATmega8
// clock: internal 1Mhz
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/delay.h>
#include <avr/eeprom.h>
#include "3310LCD_function.c"
#define uchar uint8_t
#define uint uint16_t
#define SLA_W 0b11000000
#define SLA_R 0b11000001
uchar senddata[5] ;
uchar readdata[5] ;
uchar search = 0;
uchar search_up = 0;
//-------------------------------
// 延时
void delay_ms(uint ms)
{
uint i;
for(i=0;i<ms;i++)
_delay_loop_2(250);
}
void set5767(void)
{
uchar i = 0;
TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); // SEND START SIGNAL
while (!(TWCR & (1<<TWINT))); // WAIT FOR START SIG
//if ((TWSR & 0xF8) != START) ERROR();
TWDR = SLA_W; // send address
TWCR = (1<<TWINT) | (1<<TWEN);
while (!(TWCR & (1<<TWINT)));
//if ((TWSR & 0xF8) !=MT_SLA_ACK) ERROR();
for ( i = 0; i < 5; i++ )
{
TWDR = senddata[i];
TWCR = (1<<TWINT) | (1<<TWEN); // send data
while (!(TWCR & (1<<TWINT)));
// if ((TWSR & 0xF8) != MT_DATA_ACK) ERROR();
}
TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); //SEND STOP SIGNAL
//LCD_write_english_string(60,3,"sOK");
}
void read5767(void)
{
uchar i = 0;
TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); // SEND START SIGNAL
while (!(TWCR & (1<<TWINT))); // WAIT FOR START SIG
//if ((TWSR & 0xF8) != START) ERROR();
TWDR = SLA_R; // send address
TWCR = (1<<TWINT) | (1<<TWEN);
while (!(TWCR & (1<<TWINT)));
//if ((TWSR & 0xF8) !=MT_SLA_ACK) ERROR();
//TWCR = (1<<TWINT) | (1<<TWEN);
for ( i = 0; i < 5; i++ )
{
TWCR = (1<<TWINT) | (1<<TWEN); // read data
while (!(TWCR & (1<<TWINT)));
readdata[i] = TWDR ;
// if ((TWSR & 0xF8) != MT_DATA_ACK) ERROR();
}
TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); //SEND STOP SIGNAL
//LCD_write_english_string(10,3,"rOK");
}
void show_frequency(void)
{
uint32_t nPLL =0; //Dec
uint32_t frequency = 0; //Khz
uchar display_bit[5];
uchar tbTmp1=readdata[1];
uchar tbTmp2=readdata[0];
tbTmp2&=0x3f;
nPLL=tbTmp2*256+tbTmp1;
// calculate searched station frequency
if(senddata[2]&0x10)
frequency =(unsigned long)(nPLL*82/10-225);
else
frequency =(unsigned long)(nPLL*82/10+225);
display_bit[0] = frequency / 100000 ;
if ( display_bit[0] == 0 ) display_bit[0] = 0x20;
else display_bit[0] += 0x30;
display_bit[1] = (frequency / 10000)%10 +0x30;
display_bit[2] = (frequency / 1000)%10 +0x30;
display_bit[3] = (frequency / 100)%10 +0x30;
display_bit[4] = (frequency / 10)%10 +0x30;
LCD_write_english_string(0,2," " );
LCD_write_char(display_bit[0]);
LCD_write_char(display_bit[1]);
LCD_write_char(display_bit[2]);
LCD_write_english_string(25,2,"." );
LCD_write_char(display_bit[3]);
LCD_write_char(display_bit[4]);
LCD_write_english_string(43,2," MHz" );
}
void show_rx_power(void)
{
uchar temp;
temp = (readdata[3]>>4);
LCD_write_english_string(60,0," ");
LCD_write_char((temp/10)%10 + 0x30 );
LCD_write_char(temp%10 + 0x30 );
}
void init(void)
{
DDRB = 0XFF;
PORTB = 0XFF;
DDRD = 0B11100000;
PORTD = 0XFF;
DDRC = 0B00000000;
PORTC = 0Xff; // IO init
delay_nms(100);
//TWI
TWBR = 12;
TWCR = (1<<TWEN); //SEND STOP SIGNAL
OSCCAL=0x9d; // 8M系统内部时钟校准
//设置MCU的I/O口
DDRB |= LCD_RST | LCD_DC | LCD_CE | SPI_MOSI | SPI_CLK;
SPSR |= (1<<SPI2X); // 设置SPI时钟倍速
SPCR |= (1<<SPE)|(1<<MSTR); // 使能SPI接口，主机模式，4M时钟
LCD_init(); //初始化液晶
}
//////////////////////////////////////////////////////////////////
int main(void)
{
init();
senddata[0] = 0b01101111; //load 100MHz pll
senddata[1] = 0b10010011; // away's low side injection
senddata[2] = 0b00100000;
senddata[3] = 0b10010000;
senddata[4] = 0b00000000;
readdata[0] = senddata[0];
readdata[1] = senddata[1];
LCD_write_english_string(0,0,"FM STEREO" );
//LCD_write_english_string(0,5," stereo" );
LCD_write_english_string(0,2," 99.1Mhz" );
show_frequency();
LCD_write_inverse_string(0,5," UP ");
LCD_write_inverse_string(48,5," DOWN ");
while(1)
{
if ( bit_is_clear( PIND,3))
{
delay_nms(20);
if ( bit_is_clear( PIND,3))
{
loop_until_bit_is_set(PIND, 3);
LCD_write_english_string(0,4,"KEY1 press" );
senddata[2] &= 0x7f; // set search down
set5767();
LCD_write_english_string(0,4,"searching down" );
search_up = 0;
search = 1;
}
}
if ( bit_is_clear( PIND,2))
{
delay_nms(20);
if ( bit_is_clear( PIND,2))
{
loop_until_bit_is_set(PIND, 2);
LCD_write_english_string(0,4,"KEY2 press" );
senddata[2] |= 0x80; // set search up
set5767();
LCD_write_english_string(0,4,"searching up ");
search_up = 1;
search = 1;
}
}
if ( search )
{
read5767();
if ( readdata[0] & 0x40 ) //reach band end
{
if ( search_up )
{
senddata[0] = 0b01101001; // load 88Mhz pll
senddata[1] = 0b11011010;
set5767();
}
else
{
senddata[0] = 0b01110011; // load 108Mhz pll
senddata[1] = 0b01100100;
set5767();
}
}
if ( readdata[0] & 0x80) //has been found a station
{
show_frequency();
show_rx_power();
senddata[0] = ((readdata[0] & 0x3f) |0x40);
senddata[1] = readdata[1]; //record the pll
search = 0;
}
}
}
}

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