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avrdude/src/usbtiny.c

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/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2007 Dick Streefland, adapted for 5.4 by Limor Fried
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Driver for "usbtiny"-type programmers
* Please see http://www.xs4all.nl/~dicks/avr/usbtiny/
* and http://www.ladyada.net/make/usbtinyisp/
* For example schematics and detailed documentation
*/
#include "ac_cfg.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#include "avrdude.h"
#include "libavrdude.h"
#include "usbtiny.h"
#include "usbdevs.h"
#if defined(HAVE_LIBUSB) // we use LIBUSB to talk to the board
#if defined(HAVE_USB_H)
# include <usb.h>
#elif defined(HAVE_LUSB0_USB_H)
# include <lusb0_usb.h>
#else
# error "libusb needs either <usb.h> or <lusb0_usb.h>"
#endif
#include "tpi.h"
#define TPIPCR_GT_0b 0x07
#define TPI_STOP_BITS 0x03
#define LITTLE_TO_BIG_16(x) ((((x) << 8) & 0xFF00) | (((x) >> 8) & 0x00FF))
#ifndef HAVE_UINT_T
typedef unsigned int uint_t;
#endif
#ifndef HAVE_ULONG_T
typedef unsigned long ulong_t;
#endif
/*
* Private data for this programmer.
*/
struct pdata
{
usb_dev_handle *usb_handle;
int sck_period;
int chunk_size;
int retries;
};
#define PDATA(pgm) ((struct pdata *)(pgm->cookie))
// ----------------------------------------------------------------------
static void usbtiny_setup(PROGRAMMER * pgm)
{
if ((pgm->cookie = malloc(sizeof(struct pdata))) == 0) {
pmsg_error("out of memory allocating private data\n");
exit(1);
}
memset(pgm->cookie, 0, sizeof(struct pdata));
}
static void usbtiny_teardown(PROGRAMMER * pgm)
{
free(pgm->cookie);
}
// Wrapper for simple usb_control_msg messages
static int usb_control (const PROGRAMMER *pgm,
unsigned int requestid, unsigned int val, unsigned int index )
{
int nbytes;
nbytes = usb_control_msg( PDATA(pgm)->usb_handle,
USB_ENDPOINT_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
requestid,
val, index, // 2 bytes each of data
NULL, 0, // no data buffer in control message
USB_TIMEOUT ); // default timeout
if(nbytes < 0){
msg_error("\n");
pmsg_error("%s\n", usb_strerror());
return -1;
}
return nbytes;
}
// Wrapper for simple usb_control_msg messages to receive data from programmer
static int usb_in (const PROGRAMMER *pgm,
unsigned int requestid, unsigned int val, unsigned int index,
unsigned char* buffer, int buflen, int bitclk )
{
int nbytes;
int timeout;
int i;
// calculate the amount of time we expect the process to take by
// figuring the bit-clock time and buffer size and adding to the standard USB timeout.
timeout = USB_TIMEOUT + (buflen * bitclk) / 1000;
for (i = 0; i < 10; i++) {
nbytes = usb_control_msg( PDATA(pgm)->usb_handle,
USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
requestid,
val, index,
(char *)buffer, buflen,
timeout);
if (nbytes == buflen) {
return nbytes;
}
PDATA(pgm)->retries++;
}
msg_error("\n");
pmsg_error("%s (expected %d, got %d)\n", usb_strerror(), buflen, nbytes);
return -1;
}
// Report the number of retries, and reset the counter.
static void check_retries (const PROGRAMMER *pgm, const char *operation) {
if (PDATA(pgm)->retries > 0)
pmsg_info("%d retries during %s\n", PDATA(pgm)->retries, operation);
PDATA(pgm)->retries = 0;
}
// Wrapper for simple usb_control_msg messages to send data to programmer
static int usb_out (const PROGRAMMER *pgm,
unsigned int requestid, unsigned int val, unsigned int index,
unsigned char* buffer, int buflen, int bitclk )
{
int nbytes;
int timeout;
// calculate the amount of time we expect the process to take by
// figuring the bit-clock time and buffer size and adding to the standard USB timeout.
timeout = USB_TIMEOUT + (buflen * bitclk) / 1000;
nbytes = usb_control_msg( PDATA(pgm)->usb_handle,
USB_ENDPOINT_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
requestid,
val, index,
(char *)buffer, buflen,
timeout);
if (nbytes != buflen) {
msg_error("\n");
pmsg_error("%s (expected %d, got %d)\n", usb_strerror(), buflen, nbytes);
return -1;
}
return nbytes;
}
/* Reverse the bits in a byte. Needed since TPI uses little-endian
bit order (LSB first) whereas SPI uses big-endian (MSB first).*/
static unsigned char reverse(unsigned char b) {
return
( (b & 0x01) << 7)
| ((b & 0x02) << 5)
| ((b & 0x04) << 3)
| ((b & 0x08) << 1)
| ((b & 0x10) >> 1)
| ((b & 0x20) >> 3)
| ((b & 0x40) >> 5)
| ((b & 0x80) >> 7);
}
/* Calculate even parity. */
static unsigned char tpi_parity(unsigned char b)
{
unsigned char parity = 0;
int i;
for (i = 0; i < 8; ++i) {
if (b & 1)
parity ^= 1;
b >>= 1;
}
return parity;
}
/* Encode 1 start bit (0), 8 data bits, 1 parity, 2 stop bits (1)
inside 16 bits. The data is padded to 16 bits by 4 leading 1s
(which will be ignored since they're not start bits). This layout
enables a write to be followed by a read. */
static unsigned short tpi_frame(unsigned char b) {
return LITTLE_TO_BIG_16(0xf000 |
(reverse(b) << 3) |
tpi_parity(b) << 2 |
TPI_STOP_BITS);
}
/* Transmit a single byte encapsulated in a 32-bit transfer. Unused
bits are padded with 1s. */
static int usbtiny_tpi_tx(const PROGRAMMER *pgm, unsigned char b0) {
unsigned char res[4];
if (usb_in(pgm, USBTINY_SPI, tpi_frame(b0), 0xffff,
res, sizeof(res), 8 * sizeof(res) * PDATA(pgm)->sck_period) < 0)
return -1;
msg_notice2("CMD_TPI_TX: [0x%02x]\n", b0);
return 1;
}
/* Transmit a two bytes encapsulated in a 32-bit transfer. Unused
bits are padded with 1s. */
static int usbtiny_tpi_txtx(const PROGRAMMER *pgm,
unsigned char b0, unsigned char b1)
{
unsigned char res[4];
if (usb_in(pgm, USBTINY_SPI, tpi_frame(b0), tpi_frame(b1),
res, sizeof(res), 8 * sizeof(res) * PDATA(pgm)->sck_period) < 0)
return -1;
msg_notice2("CMD_TPI_TX_TX: [0x%02x 0x%02x]\n", b0, b1);
return 1;
}
/* Transmit a byte then receive a byte, all encapsulated in a 32-bit
transfer. Unused bits are padded with 1s. This code assumes that
the start bit of the byte being received arrives within at most 2
TPICLKs. We ensure this by calling avr_tpi_program_enable() with
delay==TPIPCR_GT_0b. */
static int usbtiny_tpi_txrx(const PROGRAMMER *pgm, unsigned char b0) {
unsigned char res[4], r;
short w;
if (usb_in(pgm, USBTINY_SPI, tpi_frame(b0), 0xffff,
res, sizeof(res), 8 * sizeof(res) * PDATA(pgm)->sck_period) < 0)
return -1;
w = (res[2] << 8) | res[3];
/* Look for start bit (there should be no more than two 1 bits): */
while (w < 0)
w <<= 1;
/* Now that we found the start bit, the top 9 bits contain the start
bit and the 8 data bits, but the latter in reverse order. */
r = reverse(w >> 7);
if (tpi_parity(r) != ((w >> 6) & 1)) {
pmsg_error("parity bit is wrong\n");
return -1;
}
if (((w >> 4) & 0x3) != TPI_STOP_BITS) {
pmsg_error("stop bits not received correctly\n");
return -1;
}
msg_notice2("CMD_TPI_TX_RX: [0x%02x -> 0x%02x]\n", b0, r);
return r;
}
// Sometimes we just need to know the SPI command for the part to perform
// a function. Here we wrap this request for an operation so that we
// can just specify the part and operation and it'll do the right stuff
// to get the information from AvrDude and send to the USBtiny
static int usbtiny_avr_op (const PROGRAMMER *pgm, const AVRPART *p,
int op,
unsigned char *res)
{
unsigned char cmd[4];
if (p->op[op] == NULL) {
pmsg_error("operation %d not defined for this chip\n", op);
return -1;
}
memset(cmd, 0, sizeof(cmd));
avr_set_bits(p->op[op], cmd);
return pgm->cmd(pgm, cmd, res);
}
// ----------------------------------------------------------------------
/* Find a device with the correct VID/PID match for USBtiny */
static int usbtiny_open(PROGRAMMER *pgm, const char *name) {
struct usb_bus *bus;
struct usb_device *dev = 0;
const char *bus_name = NULL;
char *dev_name = NULL;
int vid, pid;
// if no -P was given or '-P usb' was given
if(strcmp(name, "usb") == 0)
name = NULL;
else {
// calculate bus and device names from -P option
const size_t usb_len = strlen("usb");
if(strncmp(name, "usb", usb_len) == 0 && ':' == name[usb_len]) {
bus_name = name + usb_len + 1;
dev_name = strchr(bus_name, ':');
if(NULL != dev_name)
*dev_name++ = '\0';
}
}
usb_init(); // initialize the libusb system
usb_find_busses(); // have libusb scan all the usb buses available
usb_find_devices(); // have libusb scan all the usb devices available
PDATA(pgm)->usb_handle = NULL;
if (pgm->usbvid)
vid = pgm->usbvid;
else
vid = USBTINY_VENDOR_DEFAULT;
LNODEID usbpid = lfirst(pgm->usbpid);
if (usbpid) {
pid = *(int *)(ldata(usbpid));
if (lnext(usbpid))
pmsg_warning("using PID 0x%04x, ignoring remaining PIDs in list\n", pid);
} else {
pid = USBTINY_PRODUCT_DEFAULT;
}
// now we iterate through all the buses and devices
for ( bus = usb_busses; bus; bus = bus->next ) {
for ( dev = bus->devices; dev; dev = dev->next ) {
if (dev->descriptor.idVendor == vid
&& dev->descriptor.idProduct == pid ) { // found match?
pmsg_notice("usbdev_open(): found USBtinyISP, bus:device: %s:%s\n", bus->dirname, dev->filename);
// if -P was given, match device by device name and bus name
if(name != NULL &&
(NULL == dev_name ||
strcmp(bus->dirname, bus_name) ||
strcmp(dev->filename, dev_name)))
continue;
PDATA(pgm)->usb_handle = usb_open(dev); // attempt to connect to device
// wrong permissions or something?
if (!PDATA(pgm)->usb_handle) {
pmsg_warning("cannot open USB device: %s\n", usb_strerror());
continue;
}
}
}
}
if(NULL != name && NULL == dev_name) {
pmsg_error("invalid -P value: '%s'\n", name);
imsg_error("use -P usb:bus:device\n");
return -1;
}
if (!PDATA(pgm)->usb_handle) {
pmsg_error("cannot find USBtiny device (0x%x/0x%x)\n", vid, pid );
return -1;
}
return 0; // If we got here, we must have found a good USB device
}
/* Clean up the handle for the usbtiny */
static void usbtiny_close ( PROGRAMMER* pgm )
{
if (! PDATA(pgm)->usb_handle) {
return; // not a valid handle, bail!
}
usb_close(PDATA(pgm)->usb_handle); // ask libusb to clean up
PDATA(pgm)->usb_handle = NULL;
}
/* A simple calculator function determines the maximum size of data we can
shove through a USB connection without getting errors */
static void usbtiny_set_chunk_size (const PROGRAMMER *pgm, int period) {
PDATA(pgm)->chunk_size = CHUNK_SIZE; // start with the maximum (default)
while (PDATA(pgm)->chunk_size > 8 && period > 16) {
// Reduce the chunk size for a slow SCK to reduce
// the maximum time of a single USB transfer.
PDATA(pgm)->chunk_size >>= 1;
period >>= 1;
}
}
/* Given a SCK bit-clock speed (in useconds) we verify its an OK speed and tell the
USBtiny to update itself to the new frequency */
static int usbtiny_set_sck_period (const PROGRAMMER *pgm, double v) {
PDATA(pgm)->sck_period = (int)(v * 1e6 + 0.5); // convert from us to 'int', the 0.5 is for rounding up
// Make sure its not 0, as that will confuse the usbtiny
if (PDATA(pgm)->sck_period < SCK_MIN)
PDATA(pgm)->sck_period = SCK_MIN;
// We can't go slower, due to the byte-size of the clock variable
if (PDATA(pgm)->sck_period > SCK_MAX)
PDATA(pgm)->sck_period = SCK_MAX;
pmsg_notice("setting SCK period to %d usec\n",
PDATA(pgm)->sck_period );
// send the command to the usbtiny device.
// MEME: for at90's fix resetstate?
if (usb_control(pgm, USBTINY_POWERUP, PDATA(pgm)->sck_period, RESET_LOW) < 0)
return -1;
// with the new speed, we'll have to update how much data we send per usb transfer
usbtiny_set_chunk_size(pgm, PDATA(pgm)->sck_period);
return 0;
}
static int usbtiny_initialize (const PROGRAMMER *pgm, const AVRPART *p ) {
unsigned char res[4]; // store the response from usbtinyisp
int tries;
// Check for bit-clock and tell the usbtiny to adjust itself
if (pgm->bitclock > 0.0) {
// -B option specified: convert to valid range for sck_period
usbtiny_set_sck_period(pgm, pgm->bitclock);
} else {
// -B option not specified: use default
PDATA(pgm)->sck_period = SCK_DEFAULT;
pmsg_notice("using SCK period of %d usec\n", PDATA(pgm)->sck_period );
if (usb_control(pgm, USBTINY_POWERUP,
PDATA(pgm)->sck_period, RESET_LOW ) < 0)
return -1;
usbtiny_set_chunk_size(pgm, PDATA(pgm)->sck_period);
}
// Let the device wake up.
usleep(50000);
if (p->prog_modes & PM_TPI) {
/* Since there is a single TPIDATA line, SDO and SDI must be
linked together through a 1kOhm resistor. Verify that
everything we send on SDO gets mirrored back on SDI. */
msg_notice2("doing SDO-SDI link check\n");
memset(res, 0xaa, sizeof(res));
if (usb_in(pgm, USBTINY_SPI, LITTLE_TO_BIG_16(0x1234), LITTLE_TO_BIG_16(0x5678),
res, 4, 32 * PDATA(pgm)->sck_period) < 0) {
pmsg_error("usb_in() failed\n");
return -1;
}
if (res[0] != 0x12 || res[1] != 0x34 || res[2] != 0x56 || res[3] != 0x78) {
pmsg_error("SDO->SDI check failed (got 0x%02x 0x%02x 0x%02x 0x%02x)\n"
"\tplease verify that SDI is connected directly to TPIDATA and\n"
"\tSDO is connected to TPIDATA through a 1kOhm resistor\n",
res[0], res[1], res[2], res[3]);
return -1;
}
/* keep TPIDATA high for >= 16 clock cycles: */
if (usb_in(pgm, USBTINY_SPI, 0xffff, 0xffff, res, 4,
32 * PDATA(pgm)->sck_period) < 0)
{
pmsg_error("unable to switch chip into TPI mode\n");
return -1;
}
}
for (tries = 0; tries < 4; ++tries) {
if (pgm->program_enable(pgm, p) >= 0)
break;
// no response, RESET and try again
if (usb_control(pgm, USBTINY_POWERUP,
PDATA(pgm)->sck_period, RESET_HIGH) < 0 ||
usb_control(pgm, USBTINY_POWERUP,
PDATA(pgm)->sck_period, RESET_LOW) < 0)
return -1;
usleep(50000);
}
if (tries >= 4)
return -1;
return 0;
}
static int usbtiny_setpin(const PROGRAMMER *pgm, int pinfunc, int value) {
/* USBtiny is not a bit bang device, but it can set RESET */
if(pinfunc == PIN_AVR_RESET) {
if (usb_control(pgm, USBTINY_POWERUP,
PDATA(pgm)->sck_period, value ? RESET_HIGH : RESET_LOW) < 0) {
return -1;
}
usleep(50000);
return 0;
}
return -1;
}
/* Tell the USBtiny to release the output pins, etc */
static void usbtiny_powerdown(const PROGRAMMER *pgm) {
if (!PDATA(pgm)->usb_handle) {
return; // wasn't connected in the first place
}
usb_control(pgm, USBTINY_POWERDOWN, 0, 0); // Send USB control command to device
}
/* Send a 4-byte SPI command to the USBtinyISP for execution
This procedure is used by higher-level Avrdude procedures */
static int usbtiny_cmd(const PROGRAMMER *pgm, const unsigned char *cmd, unsigned char *res) {
int nbytes;
// Make sure its empty so we don't read previous calls if it fails
memset(res, '\0', 4 );
nbytes = usb_in( pgm, USBTINY_SPI,
(cmd[1] << 8) | cmd[0], // convert to 16-bit words
(cmd[3] << 8) | cmd[2], // "
res, 4, 8 * PDATA(pgm)->sck_period );
if (nbytes < 0)
return -1;
check_retries(pgm, "SPI command");
// print out the data we sent and received
msg_notice2("CMD: [%02x %02x %02x %02x] [%02x %02x %02x %02x]\n",
cmd[0], cmd[1], cmd[2], cmd[3],
res[0], res[1], res[2], res[3] );
return ((nbytes == 4) && // should have read 4 bytes
res[2] == cmd[1]); // AVR's do a delayed-echo thing
}
int usbtiny_cmd_tpi(const PROGRAMMER *pgm, const unsigned char *cmd,
int cmd_len, unsigned char *res, int res_len)
{
unsigned char b0, b1;
int tx, rx, r;
/* Transmits command two bytes at the time until we're down to 0 or
1 command byte. Then we're either done or we transmit the final
byte optionally followed by reading 1 byte. With the current TPI
protocol, we never receive more than one byte. */
for (tx = rx = 0; tx < cmd_len; ) {
b0 = cmd[tx++];
if (tx < cmd_len) {
b1 = cmd[tx++];
if (usbtiny_tpi_txtx(pgm, b0, b1) < 0)
return -1;
} else {
if (res_len > 0) {
if ((r = usbtiny_tpi_txrx(pgm, b0)) < 0)
return -1;
res[rx++] = r;
} else {
if (usbtiny_tpi_tx(pgm, b0) < 0)
return -1;
}
}
}
if (rx < res_len) {
pmsg_error("unexpected cmd_len=%d/res_len=%d\n", cmd_len, res_len);
return -1;
}
return 0;
}
static int usbtiny_spi(const PROGRAMMER *pgm, const unsigned char *cmd, unsigned char *res, int count) {
int i;
// Clear the receive buffer so we don't read old data in case of failure
memset(res, 0, count);
if (count % 4) {
pmsg_error("direct SPI write must be a multiple of 4 bytes for %s\n", pgm->type);
return -1;
}
for (i = 0; i < count; i += 4) {
if (usbtiny_cmd(pgm, cmd + i, res + i) < 0) {
return -1;
}
}
return 0;
}
/* Send the chip-erase command */
static int usbtiny_chip_erase(const PROGRAMMER *pgm, const AVRPART *p) {
unsigned char res[4];
if (p->prog_modes & PM_TPI)
return avr_tpi_chip_erase(pgm, p);
if (p->op[AVR_OP_CHIP_ERASE] == NULL) {
pmsg_error("chip erase instruction not defined for part %s\n", p->desc);
return -1;
}
// get the command for erasing this chip and transmit to avrdude
if (! usbtiny_avr_op( pgm, p, AVR_OP_CHIP_ERASE, res )) {
return -1;
}
if(pgm->prog_modes & PM_SPM) { // Talking to bootloader directly
AVRMEM *fl = avr_locate_mem(p, "flash");
// Estimated time it takes to erase all pages in bootloader
usleep(p->chip_erase_delay * (fl? fl->num_pages: 999));
} else
usleep(p->chip_erase_delay);
// prepare for further instruction
pgm->initialize(pgm, p);
return 0;
}
// These are required functions but don't actually do anything
static void usbtiny_enable(PROGRAMMER *pgm, const AVRPART *p) {
}
static void usbtiny_disable(const PROGRAMMER *pgm) {
}
/* To speed up programming and reading, we do a 'chunked' read.
* We request just the data itself and the USBtiny uses the SPI function
* given to read in the data. Much faster than sending a 4-byte SPI request
* per byte
*/
static int usbtiny_paged_load (const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m,
unsigned int page_size,
unsigned int addr, unsigned int n_bytes)
{
unsigned int maxaddr = addr + n_bytes;
int chunk, function;
OPCODE *lext, *readop;
unsigned char cmd[8];
// First determine what we're doing
function = strcmp(m->desc, "eeprom")==0?
USBTINY_EEPROM_READ: USBTINY_FLASH_READ;
// paged_load() only called for pages, so OK to set ext addr once at start
if((lext = m->op[AVR_OP_LOAD_EXT_ADDR])) {
memset(cmd, 0, sizeof(cmd));
avr_set_bits(lext, cmd);
avr_set_addr(lext, cmd, addr/2);
if(pgm->cmd(pgm, cmd, cmd+4) < 0)
return -1;
}
// Byte acces as work around to correctly read flash above 64 kiB
if(function == USBTINY_FLASH_READ && addr >= 0x10000) {
for(unsigned int i=0; i<n_bytes; i++, addr++) {
if(!(readop = m->op[addr&1? AVR_OP_READ_HI: AVR_OP_READ_LO]))
return -1;
memset(cmd, 0, sizeof(cmd));
avr_set_bits(readop, cmd);
avr_set_addr(readop, cmd, addr/2);
if(pgm->cmd(pgm, cmd, cmd+4) < 0)
return -1;
m->buf[addr] = 0;
avr_get_output(readop, cmd+4, m->buf + addr);
}
return n_bytes;
}
for (; addr < maxaddr; addr += chunk) {
chunk = PDATA(pgm)->chunk_size; // start with the maximum chunk size possible
if (addr + chunk > maxaddr) {
chunk = maxaddr - addr;
}
// Send the chunk of data to the USBtiny with the function we want
// to perform
if (usb_in(pgm,
function, // EEPROM or flash
0, // delay between SPI commands
addr, // address in memory
m->buf + addr, // pointer to where we store data
chunk, // number of bytes
32 * PDATA(pgm)->sck_period) // each byte gets turned into a 4-byte SPI cmd
< 0) {
// usb_in() multiplies this per byte.
return -1;
}
}
check_retries(pgm, "read");
return n_bytes;
}
/* To speed up programming and reading, we do a 'chunked' write.
* We send just the data itself and the USBtiny uses the SPI function
* given to write the data. Much faster than sending a 4-byte SPI request
* per byte.
*/
static int usbtiny_paged_write(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m,
unsigned int page_size,
unsigned int addr, unsigned int n_bytes)
{
unsigned int maxaddr = addr + n_bytes;
int chunk; // Size of data to write at once
int next;
int function; // which SPI command to use
int delay; // delay required between SPI commands
// First determine what we're doing
if (strcmp( m->desc, "flash" ) == 0) {
function = USBTINY_FLASH_WRITE;
} else {
function = USBTINY_EEPROM_WRITE;
}
delay = 0;
if (! m->paged) {
unsigned int poll_value;
// Does this chip not support paged writes?
poll_value = (m->readback[1] << 8) | m->readback[0];
if (usb_control(pgm, USBTINY_POLL_BYTES, poll_value, 0 ) < 0)
return -1;
delay = m->max_write_delay;
}
for (; addr < maxaddr; addr += chunk) {
// start with the max chunk size
chunk = PDATA(pgm)->chunk_size;
if (addr + chunk > maxaddr) {
chunk = maxaddr - addr;
}
// we can only write a page at a time anyways
if (m->paged && chunk > page_size)
chunk = page_size;
if (usb_out(pgm,
function, // Flash or EEPROM
delay, // How much to wait between each byte
addr, // Address in memory
m->buf + addr, // Pointer to data
chunk, // Number of bytes to write
32 * PDATA(pgm)->sck_period + delay // each byte gets turned into a
// 4-byte SPI cmd usb_out() multiplies
// this per byte. Then add the cmd-delay
) < 0) {
return -1;
}
next = addr + chunk; // Calculate what address we're at now
if (m->paged
&& ((next % page_size) == 0 || next == maxaddr) ) {
// If we're at a page boundary, send the SPI command to flush it.
avr_write_page(pgm, p, m, (unsigned long) addr);
}
}
return n_bytes;
}
static int usbtiny_program_enable(const PROGRAMMER *pgm, const AVRPART *p) {
unsigned char buf[4];
if (p->prog_modes & PM_TPI)
return avr_tpi_program_enable(pgm, p, TPIPCR_GT_0b);
else
return usbtiny_avr_op(pgm, p, AVR_OP_PGM_ENABLE, buf);
}
void usbtiny_initpgm(PROGRAMMER *pgm) {
strcpy(pgm->type, "USBtiny");
/* Mandatory Functions */
pgm->initialize = usbtiny_initialize;
pgm->enable = usbtiny_enable;
pgm->disable = usbtiny_disable;
pgm->program_enable = usbtiny_program_enable;
pgm->chip_erase = usbtiny_chip_erase;
pgm->cmd = usbtiny_cmd;
pgm->cmd_tpi = usbtiny_cmd_tpi;
pgm->open = usbtiny_open;
pgm->close = usbtiny_close;
pgm->read_byte = avr_read_byte_default;
pgm->write_byte = avr_write_byte_default;
/* Optional Functions */
pgm->powerup = NULL;
pgm->powerdown = usbtiny_powerdown;
pgm->paged_load = usbtiny_paged_load;
pgm->paged_write = usbtiny_paged_write;
pgm->set_sck_period = usbtiny_set_sck_period;
pgm->setup = usbtiny_setup;
pgm->teardown = usbtiny_teardown;
pgm->setpin = usbtiny_setpin;
pgm->spi = usbtiny_spi;
}
#else /* !HAVE_LIBUSB */
// Give a proper error if we were not compiled with libusb
static int usbtiny_nousb_open(PROGRAMMER *pgm, const char *name) {
pmsg_error("no usb support; please compile again with libusb installed\n");
return -1;
}
void usbtiny_initpgm(PROGRAMMER *pgm) {
strcpy(pgm->type, "usbtiny");
pgm->open = usbtiny_nousb_open;
}
#endif /* HAVE_LIBUSB */
const char usbtiny_desc[] = "Driver for \"usbtiny\"-type programmers";
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