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/*
USBasp - USB in-circuit programmer for Atmel AVR controllers
Thomas Fischl <tfischl@gmx.de>
License:
The project is built with AVR USB driver by Objective Development, which is
published under an own licence based on the GNU General Public License (GPL).
USBasp is also distributed under this enhanced licence. See Documentation.
Target.........: ATMega8 at 12 MHz
Creation Date..: 2005-02-20
Last change....: 2006-12-29
PC2 SCK speed option. GND -> slow (8khz SCK),
open -> fast (375kHz SCK)
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>
#include "usbdrv.h"
#include "isp.h"
#include "clock.h"
#define USBASP_FUNC_CONNECT 1
#define USBASP_FUNC_DISCONNECT 2
#define USBASP_FUNC_TRANSMIT 3
#define USBASP_FUNC_READFLASH 4
#define USBASP_FUNC_ENABLEPROG 5
#define USBASP_FUNC_WRITEFLASH 6
#define USBASP_FUNC_READEEPROM 7
#define USBASP_FUNC_WRITEEEPROM 8
#define PROG_STATE_IDLE 0
#define PROG_STATE_WRITEFLASH 1
#define PROG_STATE_READFLASH 2
#define PROG_STATE_READEEPROM 3
#define PROG_STATE_WRITEEEPROM 4
#define PROG_BLOCKFLAG_FIRST 1
#define PROG_BLOCKFLAG_LAST 2
#define ledRedOn() PORTC &= ~(1 << PC1)
#define ledRedOff() PORTC |= (1 << PC1)
#define ledGreenOn() PORTC &= ~(1 << PC0)
#define ledGreenOff() PORTC |= (1 << PC0)
static uchar replyBuffer[8];
static uchar prog_state = PROG_STATE_IDLE;
static unsigned int prog_address;
static unsigned int prog_nbytes = 0;
static unsigned int prog_pagesize; //TP: Mega128 fix
static uchar prog_blockflags;
static uchar prog_pagecounter;
uchar usbFunctionSetup(uchar data[8]) {
uchar len = 0;
if(data[1] == USBASP_FUNC_CONNECT){
/* set SCK speed */
if ((PINC & (1 << PC2)) == 0) {
ispSetSCKOption(ISP_SCK_SLOW);
} else {
ispSetSCKOption(ISP_SCK_FAST);
}
ispConnect();
ledRedOn();
} else if (data[1] == USBASP_FUNC_DISCONNECT) {
ispDisconnect();
ledRedOff();
} else if (data[1] == USBASP_FUNC_TRANSMIT) {
if(chip==ATM){
replyBuffer[0] = ispTransmit(data[2]);
replyBuffer[1] = ispTransmit(data[3]);
replyBuffer[2] = ispTransmit(data[4]);
replyBuffer[3] = ispTransmit(data[5]);
}else{
if(data[2]==0x24){
replyBuffer[0] = ispTransmit(data[2]);
replyBuffer[1] = ispTransmit(data[3]);
replyBuffer[2] = ispTransmit(data[4]);
switch(ispTransmit(data[5])&0x1C){
case(0x00):replyBuffer[3]=0xE0;break;
case(0x04):replyBuffer[3]=0xE5;break;
case(0x0C):replyBuffer[3]=0xEE;break;
case(0x1C):replyBuffer[3]=0xFF;break;
}
}
else if(data[2]==0x30){
replyBuffer[0] = ispTransmit(0x28);
replyBuffer[1] = ispTransmit(data[3]);
replyBuffer[2] = ispTransmit(data[4]);
replyBuffer[3] = ispTransmit(data[5]);
}
else{
replyBuffer[0] = ispTransmit(data[2]);
replyBuffer[1] = ispTransmit(data[3]);
replyBuffer[2] = ispTransmit(data[4]);
replyBuffer[3] = ispTransmit(data[5]);
}
}
len = 4;
} else if (data[1] == USBASP_FUNC_READFLASH) {
prog_address = (data[3] << 8) | data[2];
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_READFLASH;
len = 0xff; /* multiple in */
} else if (data[1] == USBASP_FUNC_READEEPROM) {
prog_address = (data[3] << 8) | data[2];
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_READEEPROM;
len = 0xff; /* multiple in */
} else if (data[1] == USBASP_FUNC_ENABLEPROG) {
replyBuffer[0] = ispEnterProgrammingMode();;
len = 1;
} else if (data[1] == USBASP_FUNC_WRITEFLASH) {
prog_address = (data[3] << 8) | data[2];
prog_pagesize = data[4];
prog_blockflags = data[5] & 0x0F;
prog_pagesize += (((unsigned int)data[5] & 0xF0)<<4); //TP: Mega128 fix
if (prog_blockflags & PROG_BLOCKFLAG_FIRST) {
prog_pagecounter = prog_pagesize;
}
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_WRITEFLASH;
len = 0xff; /* multiple out */
} else if (data[1] == USBASP_FUNC_WRITEEEPROM) {
prog_address = (data[3] << 8) | data[2];
prog_pagesize = 0;
prog_blockflags = 0;
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_WRITEEEPROM;
len = 0xff; /* multiple out */
}
usbMsgPtr = replyBuffer;
return len;
}
uchar usbFunctionRead(uchar *data, uchar len) {
uchar i;
/* check if programmer is in correct read state */
if ((prog_state != PROG_STATE_READFLASH) &&
(prog_state != PROG_STATE_READEEPROM)) {
return 0xff;
}
/* fill packet */
for (i = 0; i < len; i++) {
if (prog_state == PROG_STATE_READFLASH) {
data[i] = ispReadFlash(prog_address);
} else {
data[i] = ispReadEEPROM(prog_address);
}
prog_address++;
}
/* last packet? */
if (len < 8) {
prog_state = PROG_STATE_IDLE;
}
return len;
}
uchar usbFunctionWrite(uchar *data, uchar len) {
uchar retVal = 0;
uchar i;
/* check if programmer is in correct write state */
if ((prog_state != PROG_STATE_WRITEFLASH) &&
(prog_state != PROG_STATE_WRITEEEPROM)) {
return 0xff;
}
for (i = 0; i < len; i++) {
if (prog_state == PROG_STATE_WRITEFLASH) {
/* Flash */
if (prog_pagesize == 0) {
/* not paged */
ispWriteFlash(prog_address, data[i], 1);
} else {
/* paged */
ispWriteFlash(prog_address, data[i], 0);
prog_pagecounter --;
if (prog_pagecounter == 0) {
ispFlushPage(prog_address, data[i]);
prog_pagecounter = prog_pagesize;
}
}
} else {
/* EEPROM */
ispWriteEEPROM(prog_address, data[i]);
}
prog_nbytes --;
if (prog_nbytes == 0) {
prog_state = PROG_STATE_IDLE;
if ((prog_blockflags & PROG_BLOCKFLAG_LAST) &&
(prog_pagecounter != prog_pagesize)) {
/* last block and page flush pending, so flush it now */
ispFlushPage(prog_address, data[i]);
}
retVal = 1; // Need to return 1 when no more data is to be received
}
prog_address ++;
}
return retVal;
}
int main(void)
{
uchar i, j;
PORTD = 0;
PORTB = 0; /* no pullups on USB and ISP pins */
DDRD = ~(1 << 2); /* all outputs except PD2 = INT0 */
DDRB = ~0; /* output SE0 for USB reset */
j = 0;
while(--j){ /* USB Reset by device only required on Watchdog Reset */
i = 0;
while(--i); /* delay >10ms for USB reset */
}
DDRB = 0; /* all USB and ISP pins inputs */
DDRC = 0x03; /* all inputs except PC0, PC1 */
PORTC = 0xfe;
chip=ATM;
clockInit(); /* init timer */
ispSetSCKOption(ISP_SCK_FAST);
usbInit();
sei();
for(;;){ /* main event loop */
usbPoll();
}
return 0;
}

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