isp.h

使用ATTiny26的USBasp,简单AVR编程软件

/*
  isp.h - part of USBasp

  Autor..........: Thomas Fischl <[e-mail]> 
  Description....: Provides functions for communication/programming
                   over ISP interface
  Licence........: GNU GPL v2 (see Readme.txt)
  Creation Date..: 2005-02-23
  Last change....: 2007-07-23
*/

#ifndef __isp_h_included__
#define	__isp_h_included__


#define	ISP_OUT   PORTB
#define ISP_IN    PINB
#define ISP_DDR   DDRB

/*注意由于26是用USI仿SPI所以
 *与目标MISO、MOSI是交叉连的这点与M8不同*/
/*DI*/
#define ISP_MISO  PB0
/*DO*/
#define ISP_MOSI  PB1
#define ISP_SCK   PB2
#define ISP_RST   PB3

#define selectFAST PA3

#ifndef __ASSEMBLER__

#ifndef uchar
#define	uchar	unsigned char
#endif
void wait64us(void);
/* Prepare connection to target device */
static inline void ispConnect(void){
  /* all ISP pins are inputs before */
  /* now set output pins */
  ISP_DDR |= (1 << ISP_RST) | (1 << ISP_SCK) | (1 << ISP_MOSI);
  /* reset device */
  ISP_OUT &= ~(1 << ISP_RST);   /* RST low */
  ISP_OUT &= ~(1 << ISP_SCK);   /* SCK low */
  /* positive reset pulse > 2 SCK (target) */
  wait64us();
  ISP_OUT |= (1 << ISP_RST);    /* RST high */
  wait64us();                
  ISP_OUT &= ~(1 << ISP_RST);   /* RST low */
}
/* Close connection to target device */
static inline void ispDisconnect(void) {
  /* set all ISP pins inputs */
  ISP_DDR &= ~((1 << ISP_RST) | (1 << ISP_SCK) | (1 << ISP_MOSI));
  /* switch pullups off */
  ISP_OUT &= ~((1 << ISP_RST) | (1 << ISP_SCK) | (1 << ISP_MOSI));
}

/* read an write a byte from isp using software (slow) */
unsigned long ispTransmit32(unsigned long l_send);

/* enter programming mode */
uchar ispEnterProgrammingMode(void);

/* read byte from eeprom at given address */
uchar ispReadEEPROM(void);

/* write byte to flash at given address */
uchar ispWriteFlash(uchar data);

uchar ispFlushPage(void);

/* read byte from flash at given address */
uchar ispReadFlash(void);

/* write byte to eeprom at given address */
uchar ispWriteEEPROM(uchar data);

/*资源紧缺能省则省*/
void inc_prog_address(void);
#endif /* __ASSEMBLER__*/

#endif /* __isp_h_included__ */