SI4730 收音机芯片资料与程序.doc

si4730 收音机芯片资料与程序2010-03-06 12:50/*在网上看到关于这个si4730的收音机芯片的资料比较少，所以现在特发上来，共有缘人参考，如有不对之处，请指出。！晶振：24mhz单片机:at89s52注：转载请注明出处，否则追究法律责任！日期：2010-03-06版本：v1.0设计者：swssi4730资料下载地址：/file/f6de4b58f*/#includereg52.h#includeintrins.htypedef unsigned char uchar;typedef unsigned int uint;#define high 1#define low 0#define si4730_high /4730选择地址定义/#define si4730_low#define max_freq_fm 10800 /108mhz#define min_freq_fm 8750 /87.5mhz#define max_freq_am 1701 /1701khz#define min_freq_am 531 #define fm_receiver 0x20 /fm调谐频率 page.52#define fm_trnsmitter 0x30#define am_receiver 0x40 /am调谐频率#define tx_tune_measure 0x32uint frequency_fm=875;uint frequency_am=531;bit mode = 0;sbit key_up = p22; /向上搜台sbit key_dw = p23; /向下搜台sbit fm_am_choose = p24; /fm与am选择bit fm_am_ = 0;/*start condition:sclk: -|_ sdio:-|_ 1 | 2 | 3stop condition:sclk: _|- sdio:_|-1 | 2 | 3data:sclk:_|-|_|-|_ sdio:_|-|_|- |reset:senb:_|-sdio:_|-rst: _|-sclk:_|- | 1 | 2 | 3*/sbit si4730_reset = p13;sbit si4730_sclk = p12;sbit si4730_sdio = p11;/如果si4730的第六脚（sen）接高电平那么地址是0x23,0x22/如果si4730的第六脚（sen）接低电平那么地址是0xc7,0xc6/#if 0 /address switch#ifdef si4730_low#define read_addr 0x23#define write_addr 0x22#endif#ifdef si4730_high#define read_addr 0xc7#define write_addr 0xc6#endif#define sclk_high si4730_sclk = high#define sclk_low si4730_sclk = low#define sdio_high si4730_sdio = high#define sdio_low si4730_sdio = low#define read_sdio si4730_sdio/=fm start=void _nop()_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();void si4730_delay(unsigned char k)uchar i,j;for(i=150;i0;i-) for(j=k;j0;j-);#define i2c_clk_delay() _nop()void resetsi47xx_2w() si4730_reset = low; sclk_high; si4730_delay(100); sdio_high; si4730_delay(250); si4730_reset = high;void si4730_start() sdio_high; i2c_clk_delay(); sclk_high; i2c_clk_delay(); sdio_low; i2c_clk_delay(); sclk_low;void si4730_ack() sdio_low; i2c_clk_delay(); sclk_high; i2c_clk_delay(); sclk_low; i2c_clk_delay(); sdio_high;void si4730_stop() sdio_low; i2c_clk_delay(); sclk_high; i2c_clk_delay(); sdio_high; i2c_clk_delay(); sclk_low;void si4730_writebyte(uchar write_data)uchar i;for(i=8;i!=0;i-) / 循环移入8个位 read_sdio = (bit)(write_data & 0x80); sclk_high; i2c_clk_delay(); sclk_low; /sda数据线上数据变化 write_data = 1; /调整发送位void operation_si4730_write(uchar *data1,uchar numbyte)uchar j;si4730_start();si4730_writebyte(write_addr);/器件地址 0xc6si4730_ack();i2c_clk_delay();for(j=low;j=300mssi4730_delay(250);si4730_delay(250);si4730_delay(120); void si4730_tune(char mod,unsigned short channel_freq)unsigned char write_buf5;write_buf0= mod; write_buf1= 0x00;write_buf2 = channel_freq 8; /写入高字节write_buf3 = channel_freq; /写入低字节write_buf4= 0x00; operation_si4730_write(&(write_buf0), 5);void search_fm() /调用手动fm 频率调整子程序 menu = 15 if(mode) frequency_fm += 10; /步进+0.1mhz if(frequency_fm max_freq_fm) frequency_fm = min_freq_fm; else frequency_fm -= 10; /步进-0.1mhz if(frequency_fm 8; /写入高字节write_buf3 = channel_freq; /写入低字节write_buf4= 0x00;write_buf5= 0x00; operation_si4730_write(&(write_buf0), 6);void search_am() /调用手动fm 频率调整子程序 menu = 95 if(mode) frequency_am += 9; /步进+9khz if(frequency_am max_freq_am) frequency_am = min_freq_am; else frequency_am -= 9; /步进-9khz if(frequency_am min_freq_am) frequency_am = max_freq_am; / si4730_power_up(am_receiver); /向上搜台si4730_tune_am(am_receiver,frequency_am); /am收音芯片数据刷新一次 /=am end=/=main start=void main()si4730_delay(250);si4730_power_up_fm_am_choose(fm_receiver); /默认选择fmwhile(1) if(!fm_am_choose) si4730_delay(100); if(!fm_am_choose) fm_am_ = fm_am_; if(!fm_am_) si4730_power_up_fm_am_choose(fm_receiver); /fm选择 else if(fm_am_) si4730_power_up_fm_am_choose(am_receiver ); /am选择 if(!fm_am_) / resetsi47xx_2w(); if(!key_up) si4730_delay(100); if(!key_up) mode = high; /向上搜台 search_fm(); if(!key_dw) si4730_delay(100); if(!key_dw) mode = low; /向下搜台 search_fm