;/***************************************************** ;Project : ATmega2560 MCU간의 SPI통신 테스트 ;Version : LK-AVR2560D V01 ;Date : 2011-07-28 ;Author : Kyung Nam Lee ;Company : LKEMBEDDED ;Compiler: CodevisionAVR+AVRStudio ;Comment: Master MCU(LK-AVR2560D확장형 개발보드)에서 SW1, SW2를 입력하면 Slave MCU(LK-AVR2560D확장형 개발보드) ; 에서 부저와 LED가 ON/OFF 되며 마스터, 슬레이브 보드에서 서로 교환한 데이터를 RS232포트에 출력 하는 프로그램이다. ; 이때의 LK-AVR2560D확장형 개발보드간의 내장 된 10핀 박스헤더 커넥터(PORTB)는 10P플랫케이블 이용하여 반드시 서로 연결 되어 있어야 한다. ;*****************************************************/ ; ;#include ;PCODE: $00000000 VOL: 0 #ifndef __SLEEP_DEFINED__ ;PCODE: $00000001 VOL: 0 #define __SLEEP_DEFINED__ ;PCODE: $00000002 VOL: 0 .EQU __se_bit=0x01 ;PCODE: $00000003 VOL: 0 .EQU __sm_mask=0x0E ;PCODE: $00000004 VOL: 0 .EQU __sm_powerdown=0x04 ;PCODE: $00000005 VOL: 0 .EQU __sm_powersave=0x06 ;PCODE: $00000006 VOL: 0 .EQU __sm_standby=0x0C ;PCODE: $00000007 VOL: 0 .EQU __sm_ext_standby=0x0E ;PCODE: $00000008 VOL: 0 .EQU __sm_adc_noise_red=0x02 ;PCODE: $00000009 VOL: 0 .SET power_ctrl_reg=smcr ;PCODE: $0000000A VOL: 0 #endif ;PCODE: $0000000B VOL: 0 ;PCODE: $0000000C VOL: 0 ;#include ;#include ; ;//#define Master ;#define Slave //LK-AVR2560D확장형 개발보드 Master or Slave동작 모드를 설정! ; ; ;#ifdef Master ;unsigned char SPI_send(unsigned char data)// ;{ ; unsigned char data3=0; ; SPDR = data; /* Start transmission */ ; while(!(SPSR&0x80)); /* Wait for transmission complete */ ; return SPDR; ; /*return SPDR; 전송(write)함수와 읽기 함수를 구분 짓기 위해서 주석처리를 한다. ; 필자는 굳이 함수를 따로 만들 필요성을 못 느낀다. ; 중요한 것은 SPI통신시에 Master에서 SPDR레지스터에 기록할때만 SPI Clock이 출력된다는 점이다. ; 즉, 슬레이브에서는 SPDR레지스터에 값을 기록해서 대기하고 있으며, Master에서 SPDR레지스터에 값을 ; 기록(출력하면) Feedback 되어서 Master에 입력된다는 점입니다. ; */ ;} ;char SPI_read()//dummy값으로도 읽어 올수 있지만 위 SPI_send함수처럼 바로 읽어 들어 와도 무관한다. ;{ ; unsigned char data3=0; ; SPDR = 0x00; //Dummy Data ; while(!(SPSR&0x80)); ; return SPDR; ;} ;void Master_init() ;{ ; PORTB=0x00; ; DDRB=0x07; /* Set MOSI and SCK output, all others input */ ; SPCR=0x50; /* Enable SPI, Master, set clock rate fck/16 */ ; SPSR=0x00; ;} ;#endif ; ;#ifdef Slave ;/*슬레이브측에서 마스터로 데이터를 보낼 시에는 데이터를 SPDR레지스터에 저장만 하면됩니다. ;이때의 마스터가 슬레이브로 데이터를 보낼 때 슬레이브의 데이터는 자동적으로 마스터로 전송됩니다. ;결국 마스터에서 발생되는 SPI클럭 없이는 슬레이브에서 단독으로 마스터로 데이터를 보낼수는 없으며, ;AVR칩의 SPI통신은 마스터와 슬레이브가 서로 교차연결된 원형(LOOP)구조로 데이터를 교환하고 있다.*/ ;char SPI_receive() //slave ; 0000 0039 { .CSEG ;PCODE: $0000000D VOL: 0 ;PCODE: $0000000E VOL: 0 ; 0000 003A ; 0000 003B unsigned char data2=0; ; 0000 003C while(!(SPSR&0x80)); /* Wait for reception complete */ ;PCODE: $0000000F VOL: 0 ; data2 -> R17 ;PCODE: $00000010 VOL: 0 ;PCODE: $00000011 VOL: 0 ;PCODE: $00000012 VOL: 0 ;PCODE: $00000013 VOL: 0 ;PCODE: $00000014 VOL: 0 ;PCODE: $00000015 VOL: 0 ;PCODE: $00000016 VOL: 0 ;PCODE: $00000017 VOL: 0 ; 0000 003D data2= SPDR; /* Return Data Register */ ;PCODE: $00000018 VOL: 0 ;PCODE: $00000019 VOL: 0 ; 0000 003E if(data2==0xfe) ;PCODE: $0000001A VOL: 0 ;PCODE: $0000001B VOL: 0 ;PCODE: $0000001C VOL: 0 ; 0000 003F SPDR = 1; /* Start transmission */ ;PCODE: $0000001D VOL: 0 ;PCODE: $0000001E VOL: 0 ; 0000 0040 else SPDR = 2; ;PCODE: $0000001F VOL: 0 ;PCODE: $00000020 VOL: 0 ;PCODE: $00000021 VOL: 0 ;PCODE: $00000022 VOL: 0 ; 0000 0041 printf("SLAVE LK-AVR2560D:receive data from MASTER:%d \r\n",data2); ;PCODE: $00000023 VOL: 0 ;PCODE: $00000024 VOL: 0 ;PCODE: $00000025 VOL: 0 ;PCODE: $00000026 VOL: 0 ;PCODE: $00000027 VOL: 0 ;PCODE: $00000028 VOL: 0 ;PCODE: $00000029 VOL: 0 ;PCODE: $0000002A VOL: 0 ;PCODE: $0000002B VOL: 0 ;PCODE: $0000002C VOL: 0 ;PCODE: $0000002D VOL: 0 ; 0000 0042 return data2; ;PCODE: $0000002E VOL: 0 ;PCODE: $0000002F VOL: 0 ;PCODE: $00000030 VOL: 0 ; 0000 0043 ; 0000 0044 } ;PCODE: $00000031 VOL: 0 ;void Slave_init() ; 0000 0046 { ;PCODE: $00000032 VOL: 0 ;PCODE: $00000033 VOL: 0 ; 0000 0047 ; 0000 0048 PORTB=0x00; ;PCODE: $00000034 VOL: 0 ;PCODE: $00000035 VOL: 0 ; 0000 0049 DDRB=0x08; /* Set MISO output, all others input */ ;PCODE: $00000036 VOL: 0 ;PCODE: $00000037 VOL: 0 ; 0000 004A SPCR=0x40; /* Enable SPI */ ;PCODE: $00000038 VOL: 0 ;PCODE: $00000039 VOL: 0 ; 0000 004B SPSR=0x00; ;PCODE: $0000003A VOL: 0 ;PCODE: $0000003B VOL: 0 ; 0000 004C } ;PCODE: $0000003C VOL: 0 ;PCODE: $0000003D VOL: 0 ;#endif ; ;void main(void) ; 0000 0050 { ;PCODE: $0000003E VOL: 0 ; 0000 0051 UCSR0A=0x00; ;PCODE: $0000003F VOL: 0 ;PCODE: $00000040 VOL: 0 ; 0000 0052 UCSR0B=0x08; ;PCODE: $00000041 VOL: 0 ;PCODE: $00000042 VOL: 0 ; 0000 0053 UCSR0C=0x06; ;PCODE: $00000043 VOL: 0 ;PCODE: $00000044 VOL: 0 ; 0000 0054 UBRR0H=0x00; ;PCODE: $00000045 VOL: 0 ;PCODE: $00000046 VOL: 0 ; 0000 0055 UBRR0L=0x67; ;PCODE: $00000047 VOL: 0 ;PCODE: $00000048 VOL: 0 ; 0000 0056 ; 0000 0057 DDRG=0X13; //LED, BUZZ OUTPUT SET ;PCODE: $00000049 VOL: 0 ;PCODE: $0000004A VOL: 0 ; 0000 0058 PORTG=0X13; //LED, BUZZ INITIALIZE ;PCODE: $0000004B VOL: 0 ;PCODE: $0000004C VOL: 0 ; 0000 0059 ; 0000 005A #ifdef Master //master? ; 0000 005B Master_init(); ; 0000 005C #endif ; 0000 005D #ifdef Slave //master? ; 0000 005E Slave_init(); ;PCODE: $0000004D VOL: 0 ; 0000 005F #endif ; 0000 0060 while (1) ;PCODE: $0000004E VOL: 0 ; 0000 0061 { ; 0000 0062 #ifdef Master //master? ; 0000 0063 static unsigned char data1=0; ; 0000 0064 if((PING&0X04)==0) ; 0000 0065 { ; 0000 0066 delay_ms(20); //8mS 지연시간이 확보가 되야만 송신값과 수신값이 겹쳐서 printf()출력 되지 않는다. ; 0000 0067 data1=SPI_send(0XFF); //Slave '0xff' Transmitter! ; 0000 0068 printf("MASTER LK-AVR2560D: receive data from SLAVE:%d \r\n",data1); ; 0000 0069 } ; 0000 006A else if((PING&0X08)==0) ; 0000 006B { ; 0000 006C delay_ms(20); ; 0000 006D data1=SPI_send(0XFE); //Slave '0xfe' Transmitter! ; 0000 006E printf("MASTER LK-AVR2560D: receive data from SLAVE:%d \r\n",data1); ; 0000 006F ; 0000 0070 } ; 0000 0071 #endif ; 0000 0072 #ifdef Slave //master? ; 0000 0073 static unsigned char data=0; ; 0000 0074 data=SPI_receive(); //Receive Function ;PCODE: $0000004F VOL: 0 ;PCODE: $00000050 VOL: 0 ; 0000 0075 if(data==0xff) ;PCODE: $00000051 VOL: 0 ;PCODE: $00000052 VOL: 0 ;PCODE: $00000053 VOL: 0 ; 0000 0076 { ; 0000 0077 PORTG=0X00; //Buzz, LED ON ;PCODE: $00000054 VOL: 0 ;PCODE: $00000055 VOL: 0 ; 0000 0078 } ; 0000 0079 if(data==0xfe) ;PCODE: $00000056 VOL: 0 ;PCODE: $00000057 VOL: 0 ;PCODE: $00000058 VOL: 0 ;PCODE: $00000059 VOL: 0 ; 0000 007A { ; 0000 007B PORTG=0X13; //Buzz, LED OFF ;PCODE: $0000005A VOL: 0 ;PCODE: $0000005B VOL: 0 ; 0000 007C } ; 0000 007D #endif ; 0000 007E } ;PCODE: $0000005C VOL: 0 ;PCODE: $0000005D VOL: 0 ;PCODE: $0000005E VOL: 0 ; 0000 007F ; 0000 0080 } ;PCODE: $0000005F VOL: 0 ;PCODE: $00000060 VOL: 0 ;PCODE: $00000061 VOL: 0