rda5800.c

mega8控制的FM（RDA5800）。

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/wdt.h>
#include <avr/eeprom.h>
#define		DEBUG 0

#define		F_CPU 				8000000UL

#define		BIT_SET(a,b)		a|=(1<<b)
#define		BIT_CLR(a,b)  		a&=(~(1<<b))
#define		BIT_INV(a,b)   		a^=(1<<b)
#define		BIT_STATUS(a,b) 	((a&(1<<b))>>b)
uint8_t g_count0;

#define		HEAD_T    			12800
#define		HIGH_T    			2100
#define		LOW_T    			1000
#define		en_t1_us_int(i)   	{TCNT1=65536-i;BIT_SET(TIMSK,2);}
#define		dis_t1_int()   		{BIT_CLR(TIMSK,2);}
#define		en_t0_64us_int()   	{TCNT0=g_count0;en_HW_tout=1;BIT_SET(TIMSK,TOIE0);}
#define		dis_t0_int()   	{BIT_CLR(TIMSK,TOIE0);en_HW_tout=0;}

#ifdef HW_useICP1
 #define		HW_PIN    			BIT_STATUS(PIND,6)
 #define		SET_ICP1_UP_TRIG    BIT_SET(TCCR1B,6)
 #define		SET_ICP1_FALL_TRIG    BIT_CLR(TCCR1B,6)
 #define		en_icp1_int()  		{BIT_SET(TIMSK,1);}
 #define 		dis_icp1_int()     		{BIT_CLR(TIMSK,1);}
 #define		CLR_ICF1   			 BIT_SET(TIFR,5)
#else
 #define		HW_PIN    			BIT_STATUS(PIND,3)
 #define		SET_INT1_UP_TRIG    MCUCR|=(1<<ISC11)|(1<<ISC10);
 #define		SET_INT1_FALL_TRIG     MCUCR|=(1<<ISC11);
 #define		en_int1_int()  		GICR|=(1<<INT1);
 #define 		dis_int1_int()     	GICR&=(~(1<<INT1));
 
#endif

#define		HEAD_NEG_T		9000
#define		beep()			{BIT_CLR(PORTA,6);_delay_ms(10);BIT_SET(PORTA,6);}
#define		KEY_PRESS			!BIT_STATUS(PINC,4)


/**************communicate***********************/
#define		RB8				BIT_STATUS(UCSRB,1)
#define		TB8(i)				{if(i) BIT_SET(UCSRB,0);else BIT_CLR(UCSRB,0);}
#define		MMCS				BIT_STATUS(UCSRA,0)
#define		MMC(i)				{if(i) BIT_SET(UCSRA,0);else BIT_CLR(UCSRA,0);}
#define		SLA_ADR			1
#define		HOST_ADR		0
#define		BCT				0xff
#define		HOST_START		1
#define		HOST_MOD		2
#define		HOST_CODE		3
#define		HOST_ASK_RESULT		4
#define		EEP_ADR_CODE	0
#define		CMD_NORMAL_RESULT	1
#define		CMD_STUDY_RESULT	2

#define		LED_Y(i)	{if(i==0) BIT_SET(PORTB,7);else if(i==1) BIT_CLR(PORTB,7);else BIT_INV(PORTB,7);}
#define		LED_G(i)	{if(i==0) BIT_SET(PORTD,7);else if(i==1) BIT_CLR(PORTD,7);else BIT_INV(PORTD,7);}


static volatile uint8_t EventNum=0,flag_HWdata=0,en_HW_tout=0,step,en_rx_tout,len,cmd,flag_com_data,g_flag_speed,
						  com_rx_buf[100],HW_data,HW_num,err_buf[50],err_num,g_direction,en_led_flash;
static volatile uint32_t buffer;

static volatile enum{
	HEAD_DET,
	DATA_DET
}hw_det;

static volatile enum{
	NORMAL=0,
	STUDY
}mod;

void ini_uart(uint16_t m_baud)
{
	uint16_t   ubrr;
	/* 设置波特率*/
	ubrr=F_CPU/8/m_baud-1;
	UBRRH = (uint8_t)(ubrr>>8);
	UBRRL = (uint8_t)ubrr;
	UCSRA = (1<<U2X);
	//MMC(1);//多机通信使能
	/* 设置帧格式: 9 个数据位, 1 个停止位*/
	UCSRC = (1<<URSEL)|(1<<UCSZ0)|(1<<UCSZ1)|(1<<UCSZ2);
	/* 接收器与发送器终端使能，接收器与发送器使能*/
	UCSRB = (1<<RXCIE)/*|(1<<TXCIE)*/|(1<<RXEN)|(1<<TXEN);
}


void ini_tc0(void){
	//TCNT0 = 158;	
	//TIFR|=(1<<TOV0);	
	//TIMSK|=(1<<TOIE0);
	//TCCR0=_BV(CS02)|_BV(CS00); // 预分频 ck/1024 
	//TCCR0=_BV(CS01);// 预分频 ck/8 
	TCCR0=_BV(CS02);// 预分频 ck/256 
	
}

void ini_port(void){
	
	
	/*DDRB|=_BV(PB5)|_BV(PB1)|_BV(PB2)|_BV(PB3);
	DDRB&=(~_BV(PB0))&(~_BV(PB4));
	PORTB|=0xfF;
	PORTC|=0xff;
	DDRC|=_BV(PC5)|_BV(PC1)|_BV(PC2)|_BV(PC3)|_BV(PC4);
	DDRC&=(~_BV(PC0));
	
	PORTD|=0xff;
	DDRD|=_BV(PD7)|_BV(PD6)|_BV(PD4);
	DDRD&=(~_BV(PD2))&(~_BV(PD3))&(~_BV(PD5));*/
	PORTD|=0xff;
	DDRD|=_BV(PD5);
	DDRD|=_BV(PD6);
	
	PORTB|=0xff;
	DDRB|=_BV(PB7);
	//DDRD&=(~_BV(PD6));
	//PORTA|=0xff;
	//DDRA|=_BV(PA6);
}

uint8_t g_com_rx_data;
SIGNAL (SIG_UART_RECV) {	
	uint8_t f_100Hz;
	 g_com_rx_data=UDR;
		while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
		UDR=g_com_rx_data;
	 if(g_flag_speed){
		f_100Hz=g_com_rx_data;
		g_count0=10000/f_100Hz/64;
		while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
		UDR=g_count0;
	 }
}

void plus2pin(void){

	if(g_direction)BIT_INV(PORTD,6);
	else BIT_INV(PORTD,5);

}

//10ms中断1次
SIGNAL(SIG_OVERFLOW0)
{	
	static uint8_t  time0,time1;
	TCNT0=256-g_count0;
	TIFR|=(1<<TOV0);
	plus2pin();

	
}

void trans2host(uint8_t adr_t,uint8_t cmd_t,
				uint8_t *sp_t,uint8_t num_t){
	uint8_t i;

	TB8(1);
	while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
	UDR=HOST_ADR;
	TB8(0);
	while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
	UDR=num_t+2;
	while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
	UDR=adr_t;
	while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
	UDR=cmd_t;
	for(i=0;i<num_t;i++){
		while(!(UCSRA & (1<<UDRE)));//等待发送缓冲器为空
		UDR=*(sp_t+i);
	}
	//LED_G(3);	
}

int main(){
	uint8_t *ptr;
	ini_port();
	ini_uart(9600);//9600
	ini_tc0();
	UDR=0xaa;
	sei();
	while(1){
		switch (g_com_rx_data){
				case 1://start
					en_t0_64us_int();
					g_com_rx_data=0;
					g_flag_speed=0;
				break;
				
				case 2://stop
					g_flag_speed=0;
					g_com_rx_data=0;
					dis_t0_int();
				break;
				
				case 3://deasil
					g_flag_speed=0;
					g_com_rx_data=0;
					g_direction=0;
				break;
				
				case 4://anticlockwise
					g_flag_speed=0;
					g_com_rx_data=0;
					g_direction=1;
				break;
				
				case 255://set speed
					g_com_rx_data=0;
					g_flag_speed=1;
				break;
				
				default: break;
			}
	}

	

}