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标题: 用I/O模拟还是用硬件 [打印本页]

作者: winnie 时间: 2009-4-26 12:31
标题: 用I/O模拟还是用硬件
#ifndef __SWI2C16_H
#define __SWI2C16_H
/* PIC18 software I2C interface header */
/***** COMMON FUNCTION PROTOTYPES *****/
void SWStopI2C( void );             // Generate bus stop condition
void SWStartI2C( void );             // Generate bus start condition
void SWRestartI2C( void );          // Generate bus restart condition
void SWStopI2C( void );             // Generate bus stop condition

// USER NEEDS TO DEFINE DATA AND CLOCK PINS. RESISTORS ARE REQUIRED ON
// DATA AND CLOCK PINS.
#if defined(__18F1220) || defined(__18F1320)
#define  DATA_LOW TRISBbits.TRISB4 = 0; // define macro for data pin output
#define  DATA_HI TRISBbits.TRISB4 = 1; // define macro for data pin input
#define  DATA_LAT LATBbits.LATB4       // define macro for data pin latch
#define  DATA_PIN PORTBbits.RB4       // define macro for data pin
#define  CLOCK_LOW  TRISBbits.TRISB3 = 0; // define macro for clock pin output
#define  CLOCK_HI TRISBbits.TRISB3 = 1; // define macro for clock pin input
#define  SCLK_LAT LATBbits.LATB3       // define macro for clock pin latch
#define  SCLK_PIN PORTBbits.RB3       // define macro for clock pin
#elif defined(__18F2455) || defined(__18F2550) || \
   defined(__18F4455) || defined(__18F4550)
#define  DATA_LOW TRISBbits.TRISB0 = 0; // define macro for data pin output
#define  DATA_HI TRISBbits.TRISB0 = 1; // define macro for data pin input
#define  DATA_LAT LATBbits.LATB0       // define macro for data pin latch
#define  DATA_PIN PORTBbits.RB0       // define macro for data pin
#define  CLOCK_LOW  TRISBbits.TRISB1 = 0; // define macro for clock pin output
#define  CLOCK_HI TRISBbits.TRISB1 = 1; // define macro for clock pin input
#define  SCLK_LAT LATBbits.LATB1       // define macro for clock pin latch
#define  SCLK_PIN PORTBbits.RB1       // define macro for clock pin
#else
#define  DATA_LOW TRISCbits.TRISC4 = 0; // define macro for data pin output
#define  DATA_HI TRISCbits.TRISC4 = 1; // define macro for data pin input
#define  DATA_LAT LATCbits.LATC4       // define macro for data pin latch
#define  DATA_PIN PORTCbits.RC4       // define macro for data pin
#define  CLOCK_LOW  TRISCbits.TRISC3 = 0; // define macro for clock pin output
#define  CLOCK_HI TRISCbits.TRISC3 = 1; // define macro for clock pin input
#define  SCLK_LAT LATCbits.LATC3       // define macro for clock pin latch
#define  SCLK_PIN PORTCbits.RC3       // define macro for clock pin
#endif
/***** FUNCTION PROTOTYPES FOR PIC18CXXX *****/
signed char SWAckI2C( void );          // Read bus ACK condition
signed char Clock_test( void );
unsigned int  SWReadI2C( void );       // Read in single byte
signed char SWWriteI2C( auto unsigned char data_out ); // Write out single byte
signed char SWGetsI2C( auto unsigned char *rdptr, auto unsigned char length ); // Read in string from I2C module
signed char SWPutsI2C( auto unsigned char *wrptr ); // Write string to I2C module
#define  SWPutcI2C SWWriteI2C
#define  SWGetcI2C SWReadI2C
#define  SWNotAckI2C  SWAckI2C
#endif

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