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請問關I2C的問題
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: 2005/10/11 21:51 最後登入時間
: 2006/6/7 17:51
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請問i2c和icd2是不是沒有辦法同時使用 我是使用pic18f452來做的 一開始可以傳送和接收 但傳送兩個以上slave時會有錯誤 所以改用icd2抓bug 但換上icd2後卻完全沒辦法使用了 以下是課本的程式 ========================== master ========================== #include <p18cxxx.h> #include <delays.h>
#define I2C_Write 0x00 #define I2C_Read 0x01 #define I2C_Device1 0x20
void F_Initial(void); void F_I2C_START(void); unsigned char F_I2C_WAIT(void); unsigned char F_I2C_Send_Address(unsigned char,unsigned char); void F_I2C_Send_Data(unsigned char); void F_I2C_STOP(void); unsigned char F_I2C_Read_Data(void);
void main(void) { unsigned char UC_I2C_CMD=I2C_Write,UC_I2C_Data=0; F_Initial(); while(1) { switch (UC_I2C_CMD) { case I2C_Write: F_I2C_START(); if (F_I2C_Send_Address(I2C_Device1,UC_I2C_CMD)) F_I2C_Send_Data(UC_I2C_Data++); F_I2C_STOP(); Delay10KTCYx(20); UC_I2C_CMD=I2C_Read; break; case I2C_Read: F_I2C_START(); if (F_I2C_Send_Address(I2C_Device1,UC_I2C_CMD)) LATD = F_I2C_Read_Data(); F_I2C_STOP(); Delay10KTCYx(20); UC_I2C_CMD=I2C_Write; break; default: break; } } }
void F_Initial(void) { TRISD = 0; LATD = 0; TRISCbits.TRISC3 = 0; TRISCbits.TRISC4 = 0; SSPSTATbits.SMP = 1; SSPSTATbits.CKE = 0; SSPCON1 = 0x38; SSPADD = 0x30; }
void F_I2C_START(void) { SSPCON2bits.SEN = 1; while(!F_I2C_WAIT()); }
unsigned char F_I2C_WAIT(void) { if ( PIR1bits.SSPIF ) { PIR1bits.SSPIF = 0; return (1); } else return (0); }
unsigned char F_I2C_Send_Address(unsigned char UC_Address,unsigned char UC_RW) { SSPBUF = ((UC_Address & 0xFE) | UC_RW); while(!F_I2C_WAIT()); if ( SSPCON2bits.ACKSTAT ) return (0); else return (1); }
void F_I2C_Send_Data(unsigned char UC_Data) { SSPBUF = UC_Data; while(!F_I2C_WAIT()); }
void F_I2C_STOP(void) { SSPCON2bits.PEN = 1; while(!F_I2C_WAIT()); }
unsigned char F_I2C_Read_Data(void) { unsigned char UC_Temp=0; SSPCON2bits.RCEN = 1; while(!F_I2C_WAIT()); UC_Temp = SSPBUF; SSPCON2bits.ACKDT = 1; SSPCON2bits.ACKEN = 1; while(!F_I2C_WAIT()); return ( UC_Temp ); } ========================== slave ========================== #include <p18cxxx.h> #include <portb.h> #include <i2c.h>
#define I2C_Address 0x20
unsigned char I2C_Data=0x01;
void F_Initial ( void ); void F_Enable_High_Interrupts ( void ); void F_Check_I2C_CMD(void);
void High_INT_SER ( void );
#pragma code High_Interrupt_Vector=0x08 void High_INT_VEC (void) { _asm goto High_INT_SER _endasm } #pragma code
#pragma interrupt High_INT_SER void High_INT_SER (void) { if ( PIR1bits.SSPIF == 1 ) { PIR1bits.SSPIF = 0; F_Check_I2C_CMD(); } }
void main (void) { F_Initial(); while(1); }
void F_Initial () { TRISD = 0; LATD = 0; TRISCbits.TRISC3 = 0; TRISCbits.TRISC4 = 0; SSPADD = I2C_Address; SSPSTATbits.SMP = 1; SSPSTATbits.CKE = 0; SSPCON1 = 0x36; PIE1bits.SSPIE = 1; IPR1bits.SSPIP = 1; F_Enable_High_Interrupts(); }
void F_Enable_High_Interrupts (void) { RCONbits.IPEN = 1; INTCONbits.GIEH = 1; }
void F_Check_I2C_CMD(void) { unsigned char UC_I2C_CMD,UC_Temp; UC_I2C_CMD = (0x2D & SSPSTAT); switch (UC_I2C_CMD) { case 0x09: UC_Temp = ReadI2C(); break; case 0x29: LATD = ReadI2C(); break; case 0x0C: SSPCON1bits.CKP = 0; SSPBUF = I2C_Data; SSPCON1bits.CKP = 1; I2C_Data <<= 1; if ( I2C_Data == 0) I2C_Data=0x01; break; default: break; } }
謝謝大家的回答
發表於: 2006/5/23 11:28
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