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USBasp/firmware/main.c
Stefan Beller da7b6e47c7 Initial commit. 
This includes the files as of
wget http://www.fischl.de/usbasp/usbasp.2011-05-28.tar.gz
tar -xf usbasp.2011.05-28.tar.gz
2012-05-19 16:27:27 +02:00

341 lines
7.6 KiB
C
Executable File
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/*
* USBasp - USB in-circuit programmer for Atmel AVR controllers
*
* Thomas Fischl <tfischl@gmx.de>
*
* License........: GNU GPL v2 (see Readme.txt)
* Target.........: ATMega8 at 12 MHz
* Creation Date..: 2005-02-20
* Last change....: 2009-02-28
*
* PC2 SCK speed option.
* GND -> slow (8khz SCK),
* open -> software set speed (default is 375kHz SCK)
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>
#include "usbasp.h"
#include "usbdrv.h"
#include "isp.h"
#include "clock.h"
#include "tpi.h"
#include "tpi_defs.h"
static uchar replyBuffer[8];
static uchar prog_state = PROG_STATE_IDLE;
static uchar prog_sck = USBASP_ISP_SCK_AUTO;
static uchar prog_address_newmode = 0;
static unsigned long prog_address;
static unsigned int prog_nbytes = 0;
static unsigned int prog_pagesize;
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(USBASP_ISP_SCK_8);
} else {
ispSetSCKOption(prog_sck);
}
/* set compatibility mode of address delivering */
prog_address_newmode = 0;
ledRedOn();
ispConnect();
} else if (data[1] == USBASP_FUNC_DISCONNECT) {
ispDisconnect();
ledRedOff();
} else if (data[1] == USBASP_FUNC_TRANSMIT) {
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) {
if (!prog_address_newmode)
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) {
if (!prog_address_newmode)
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) {
if (!prog_address_newmode)
prog_address = (data[3] << 8) | data[2];
prog_pagesize = data[4];
prog_blockflags = data[5] & 0x0F;
prog_pagesize += (((unsigned int) data[5] & 0xF0) << 4);
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) {
if (!prog_address_newmode)
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 */
} else if (data[1] == USBASP_FUNC_SETLONGADDRESS) {
/* set new mode of address delivering (ignore address delivered in commands) */
prog_address_newmode = 1;
/* set new address */
prog_address = *((unsigned long*) &data[2]);
} else if (data[1] == USBASP_FUNC_SETISPSCK) {
/* set sck option */
prog_sck = data[2];
replyBuffer[0] = 0;
len = 1;
} else if (data[1] == USBASP_FUNC_TPI_CONNECT) {
tpi_dly_cnt = data[2] | (data[3] << 8);
/* RST high */
ISP_OUT |= (1 << ISP_RST);
ISP_DDR |= (1 << ISP_RST);
clockWait(3);
/* RST low */
ISP_OUT &= ~(1 << ISP_RST);
ledRedOn();
clockWait(16);
tpi_init();
} else if (data[1] == USBASP_FUNC_TPI_DISCONNECT) {
tpi_send_byte(TPI_OP_SSTCS(TPISR));
tpi_send_byte(0);
clockWait(10);
/* pulse RST */
ISP_OUT |= (1 << ISP_RST);
clockWait(5);
ISP_OUT &= ~(1 << ISP_RST);
clockWait(5);
/* 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));
ledRedOff();
} else if (data[1] == USBASP_FUNC_TPI_RAWREAD) {
replyBuffer[0] = tpi_recv_byte();
len = 1;
} else if (data[1] == USBASP_FUNC_TPI_RAWWRITE) {
tpi_send_byte(data[2]);
} else if (data[1] == USBASP_FUNC_TPI_READBLOCK) {
prog_address = (data[3] << 8) | data[2];
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_TPI_READ;
len = 0xff; /* multiple in */
} else if (data[1] == USBASP_FUNC_TPI_WRITEBLOCK) {
prog_address = (data[3] << 8) | data[2];
prog_nbytes = (data[7] << 8) | data[6];
prog_state = PROG_STATE_TPI_WRITE;
len = 0xff; /* multiple out */
} else if (data[1] == USBASP_FUNC_GETCAPABILITIES) {
replyBuffer[0] = USBASP_CAP_0_TPI;
replyBuffer[1] = 0;
replyBuffer[2] = 0;
replyBuffer[3] = 0;
len = 4;
}
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) && (prog_state != PROG_STATE_TPI_READ)) {
return 0xff;
}
/* fill packet TPI mode */
if(prog_state == PROG_STATE_TPI_READ)
{
tpi_read_block(prog_address, data, len);
prog_address += len;
return len;
}
/* fill packet ISP mode */
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) && (prog_state != PROG_STATE_TPI_WRITE)) {
return 0xff;
}
if (prog_state == PROG_STATE_TPI_WRITE)
{
tpi_write_block(prog_address, data, len);
prog_address += len;
prog_nbytes -= len;
if(prog_nbytes <= 0)
{
prog_state = PROG_STATE_IDLE;
return 1;
}
return 0;
}
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;
/* no pullups on USB and ISP pins */
PORTD = 0;
PORTB = 0;
/* all outputs except PD2 = INT0 */
DDRD = ~(1 << 2);
/* output SE0 for USB reset */
DDRB = ~0;
j = 0;
/* USB Reset by device only required on Watchdog Reset */
while (--j) {
i = 0;
/* delay >10ms for USB reset */
while (--i)
;
}
/* all USB and ISP pins inputs */
DDRB = 0;
/* all inputs except PC0, PC1 */
DDRC = 0x03;
PORTC = 0xfe;
/* init timer */
clockInit();
/* main event loop */
usbInit();
sei();
for (;;) {
usbPoll();
}
return 0;
}
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