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Adds initial avrftdi TPI support. 

Device identification is possible tested under OS X 10.6.8 with an
FT4232H and ATtiny10.

git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1145 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Hannes Weisbach 2013-05-02 11:06:15 +00:00
parent 38c5f51a33
commit 008ff9bb97
5 changed files with 550 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile.am
View File

@ -96,6 +96,8 @@ libavrdude_a_SOURCES = \
avrdude.h \
avrftdi.c \
avrftdi.h \
avrftdi_tpi.c \
avrftdi_tpi.h \
avrpart.c \
avrpart.h \
bitbang.c \

176
avrftdi.c
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@ -38,8 +38,8 @@
#include "pgm.h"
#include "avrftdi.h"
#include "avrpart.h"
#include "tpi.h"
#include "usbasp.h"
#include "avrftdi_tpi.h"
#include "avrftdi_private.h"
#ifdef HAVE_LIBUSB_1_0
#ifdef HAVE_LIBFTDI1
@ -64,26 +64,6 @@ enum { ERR, WARN, INFO, DEBUG, TRACE };
#define FTDI_DEFAULT_MASK ( (1 << (FTDI_SCK - 1)) | (1 << (FTDI_MOSI - 1)) )
#define E(x, ftdi) \
do { \
if ((x)) { \
log_err("%s: %s (%d) %s", \
#x, strerror(errno), errno, ftdi_get_error_string(ftdi)); \
return -1; \
} \
} while(0)
#define E_VOID(x, ftdi) \
do { \
if ((x)) { \
log_err("%s: %s (%d) %s", \
#x, strerror(errno), errno, ftdi_get_error_string(ftdi)); \
} \
} while(0)
#define to_pdata(pgm) \
((avrftdi_t *)((pgm)->cookie))
/* This is for running the code without having a FTDI-device.
* The generated code is useless! For debugging purposes only.
* This should never be defined, unless you know what you are
@ -92,22 +72,6 @@ enum { ERR, WARN, INFO, DEBUG, TRACE };
*/
//#define DRYRUN
typedef struct avrftdi_s {
/* pointer to struct maintained by libftdi to identify the device */
struct ftdi_context* ftdic;
/* bitmask of values for pins. bit 0 represents pin 0 ([A|B]DBUS0) */
uint16_t pin_value;
/* bitmask of pin direction. a '1' make a pin an output.
* bit 0 corresponds to pin 0. */
uint16_t pin_direction;
/* don't know. not useful. someone put it in. */
uint16_t led_mask;
/* total number of pins supported by a programmer. varies with FTDI chips */
int pin_limit;
/* internal RX buffer of the device. needed for INOUT transfers */
int rx_buffer_size;
} avrftdi_t;
static int write_flush(avrftdi_t *);
/*
@ -419,12 +383,12 @@ static int set_pin(PROGRAMMER * pgm, int pinfunc, int value)
pin = pgm->pinno[pinfunc] & PIN_MASK;
inverted = pgm->pinno[pinfunc] & PIN_INVERSE;
pin_mask = 1 << (pin - 1);
/* make value 0 or 1 and invert, if necessary */
value = (inverted) ? !value : !!value;
if (!pin) {
/* this error message is really annoying, maybe use a ratelimit? */
/*
@ -586,6 +550,71 @@ static int avrftdi_transmit(avrftdi_t* pdata, unsigned char mode, unsigned char
return written;
}
/* this function tries to sync up with the FTDI. See FTDI application note AN_129.
* AN_135 uses 0xab as bad command and enables/disables loopback around synchronisation.
* This may fail if data is left in the buffer (i.e. avrdude aborted with ctrl-c)
* or the device is in an illegal state (i.e. a previous program).
* If the FTDI is out of sync, the buffers are cleared ("purged") and the
* sync is re-tried.
* if it still fails, we return an error code. higher level code may than abort.
* the device may be reset by unplugging the device and plugging it back in.
* resetting the device did not always help for me.
*/
static int ftdi_sync(avrftdi_t* pdata)
{
unsigned char illegal_cmd[] = {0xaa};
unsigned char reply[2];
unsigned int i, n;
unsigned int retry = 0;
unsigned char latency;
ftdi_get_latency_timer(pdata->ftdic, &latency);
fprintf(stderr, "Latency: %d\n", latency);
do{
n = ftdi_read_data(pdata->ftdic, reply, 1);
} while(n > 0);
retry:
/* send command "0xaa", which is an illegal command. */
E(ftdi_write_data(pdata->ftdic, illegal_cmd, sizeof(illegal_cmd)) != sizeof(illegal_cmd), pdata->ftdic);
i = 0;
do {
#ifndef DRYRUN
n = ftdi_read_data(pdata->ftdic, &reply[i], sizeof(reply) - i);
E(n < 0, pdata->ftdic);
//fprintf(stderr, "%s\n", ftdi_get_error_string(pdata->ftdic));
#else
n = sizeof(reply) - i;
#endif
i += n;
} while (i < sizeof(reply));
/* 0xfa is return code for illegal command - we expect that, since we issued an
* illegal command (0xaa)
* the next byte will be the illegal command, the FTDI is complaining about.
*/
if(reply[0] == 0xfa && reply[1] == illegal_cmd[0])
{
/* if the FTDI is complaining about the right thing, everything is fine */
fprintf(stderr, "FTDI is in sync.\n");
return 0;
}
else
{
fprintf(stderr, "FTDI out of sync. Received 0x%02x 0x%02x\n", reply[0], reply[1]);
if(retry < 4)
{
fprintf(stderr, "Trying to re-sync by purging buffers. Attempt\n");
E(ftdi_usb_purge_buffers(pdata->ftdic), pdata->ftdic);
retry++;
goto retry;
} else
fprintf(stderr, "Aborting. Try resetting or unplugging the device.\n");
}
return -1;
}
static int write_flush(avrftdi_t* pdata)
{
unsigned char buf[6];
@ -615,23 +644,36 @@ static int write_flush(avrftdi_t* pdata)
*
* Add.: purge does NOT flush. It clears. Also, it is unkown, when the purge
* command actually arrives at the chip.
* Use read-pin-status command as sync.
* Use read pin status command as sync.
*/
#ifndef DRYRUN
//E(ftdi_usb_purge_buffers(pdata->ftdic), pdata->ftdic);
unsigned char cmd[] = { GET_BITS_LOW, SEND_IMMEDIATE };
unsigned int n;
int retries = 0;
int num = 0;
E(ftdi_write_data(pdata->ftdic, cmd, sizeof(cmd)) != sizeof(cmd), pdata->ftdic);
do
{
n = ftdi_read_data(pdata->ftdic, cmd, 1);
if(n > 0)
{
avrftdi_print(0, "Low byte lines: 0x%02x\n", cmd[0]);
num += n;
}
if(!n)
{
retries++;
}
E(n < 0, pdata->ftdic);
} while(n < 1);
} while(retries < 1/*n < 1*/);
avrftdi_print(0, "Read %d extra bytes\n", num-1);
#endif
return 0;
}
@ -698,12 +740,21 @@ static int avrftdi_open(PROGRAMMER * pgm, char *port)
}
ftdi_set_latency_timer(pdata->ftdic, 1);
//ftdi_write_data_set_chunksize(pdata->ftdic, 16);
//ftdi_read_data_set_chunksize(pdata->ftdic, 16);
/* set SPI mode */
E(ftdi_set_bitmode(pdata->ftdic, 0, BITMODE_RESET) < 0, pdata->ftdic);
E(ftdi_set_bitmode(pdata->ftdic, pdata->pin_direction & 0xff, BITMODE_MPSSE) < 0, pdata->ftdic);
E(ftdi_usb_purge_buffers(pdata->ftdic), pdata->ftdic);
/*
ret = ftdi_sync(pdata);
if(ret < 0)
return ret;
*/
write_flush(pdata);
if (pgm->baudrate) {
set_frequency(pdata, pgm->baudrate);
} else if(pgm->bitclock) {
@ -781,7 +832,6 @@ static int avrftdi_open(PROGRAMMER * pgm, char *port)
if (add_pin(pgm, PIN_AVR_MOSI)) return -1;
if (add_pin(pgm, PIN_AVR_RESET)) return -1;
/* gather the rest of the pins */
if (add_pins(pgm, PPI_AVR_VCC)) return -1;
if (add_pins(pgm, PPI_AVR_BUFF)) return -1;
@ -830,21 +880,29 @@ static void avrftdi_close(PROGRAMMER * pgm)
static int avrftdi_initialize(PROGRAMMER * pgm, AVRPART * p)
{
set_pin(pgm, PIN_AVR_RESET, OFF);
set_pins(pgm, PPI_AVR_BUFF, OFF);
set_pin(pgm, PIN_AVR_SCK, OFF);
/*use speed optimization with CAUTION*/
usleep(20 * 1000);
if(p->flags & AVRPART_HAS_TPI)
{
/* see avrftdi_tpi.c */
avrftdi_tpi_initialize(pgm, p);
}
else
{
set_pin(pgm, PIN_AVR_RESET, OFF);
set_pins(pgm, PPI_AVR_BUFF, OFF);
set_pin(pgm, PIN_AVR_SCK, OFF);
/*use speed optimization with CAUTION*/
usleep(20 * 1000);
/* giving rst-pulse of at least 2 avr-clock-cycles, for
* security (2us @ 1MHz) */
set_pin(pgm, PIN_AVR_RESET, ON);
usleep(20 * 1000);
/* giving rst-pulse of at least 2 avr-clock-cycles, for
* security (2us @ 1MHz) */
set_pin(pgm, PIN_AVR_RESET, ON);
usleep(20 * 1000);
/*setting rst back to 0 */
set_pin(pgm, PIN_AVR_RESET, OFF);
/*wait at least 20ms bevor issuing spi commands to avr */
usleep(20 * 1000);
/*setting rst back to 0 */
set_pin(pgm, PIN_AVR_RESET, OFF);
/*wait at least 20ms bevor issuing spi commands to avr */
usleep(20 * 1000);
}
return pgm->program_enable(pgm, p);
}
@ -965,6 +1023,7 @@ static int avrftdi_eeprom_write(PROGRAMMER *pgm, AVRPART *p, AVRMEM *m,
avr_set_addr(m->op[AVR_OP_WRITE], &cmd[3], add);
avr_set_input(m->op[AVR_OP_WRITE], &cmd[3], *data++);
//avrftdi_transmit(to_pdata(pgm), MPSSE_DO_WRITE, cmd, cmd, 4);
E(ftdi_write_data(to_pdata(pgm)->ftdic, cmd, sizeof(cmd)) != sizeof(cmd),
to_pdata(pgm)->ftdic);
@ -1237,11 +1296,14 @@ avrftdi_setup(PROGRAMMER * pgm)
pdata->pin_value = 0;
pdata->pin_direction = 0;
pdata->led_mask = 0;
pdata->guard_bits = 128 + 2;
pdata->set_pin = &set_pin;
}
static void
avrftdi_teardown(PROGRAMMER * pgm)
{
fprintf(stderr, "\n%s: Unintializing programmer.\n", progname);
avrftdi_t* pdata = to_pdata(pgm);
if(pdata) {

63
avrftdi_private.h Normal file
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@ -0,0 +1,63 @@
#pragma once
#include "ac_cfg.h"
#include <stdint.h>
#ifdef HAVE_LIBFTDI1
# include <libftdi1/ftdi.h>
#else
# error "libftdi1 required for avrftdi."
#endif
#include "pgm.h"
#define E(x, ftdi) \
do { \
if ((x)) \
{ \
fprintf(stderr, "%s:%d %s() %s: %s (%d)\n\t%s\n", \
__FILE__, __LINE__, __FUNCTION__, \
#x, strerror(errno), errno, ftdi_get_error_string(ftdi)); \
return -1; \
} \
} while(0)
#define E_VOID(x, ftdi) \
do { \
if ((x)) \
{ \
fprintf(stderr, "%s:%d %s() %s: %s (%d)\n\t%s\n", \
__FILE__, __LINE__, __FUNCTION__, \
#x, strerror(errno), errno, ftdi_get_error_string(ftdi)); \
} \
} while(0)
#define to_pdata(pgm) \
((avrftdi_t *)((pgm)->cookie))
typedef struct avrftdi_s {
/* pointer to struct maintained by libftdi to identify the device */
struct ftdi_context* ftdic;
/* bitmask of values for pins. bit 0 represents pin 0 ([A|B]DBUS0) */
uint16_t pin_value;
/* bitmask of pin direction. a '1' make a pin an output.
* bit 0 corresponds to pin 0. */
uint16_t pin_direction;
/* don't know. not useful. someone put it in. */
uint16_t led_mask;
/* total number of pins supported by a programmer. varies with FTDI chips */
int pin_limit;
/* internal RX buffer of the device. needed for INOUT transfers */
int rx_buffer_size;
/* number of guard bits for TPI. should be moved to struct PROGRAMMER */
int guard_bits;
/* function pointer to the set_pin function, so that we do not have to drag
* it into global scope. it's a hack, but i think it's slightly better than
* the alternative.
*/
int (*set_pin)(PROGRAMMER *, int, int);
} avrftdi_t;
void avrftdi_print(int level, const char * fmt, ...);

352
avrftdi_tpi.c Normal file
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@ -0,0 +1,352 @@
#include "ac_cfg.h"
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "pgm.h"
#include "avrpart.h"
#include "pindefs.h"
#include "tpi.h"
#include "usbasp.h"
#include "avrftdi_tpi.h"
#include "avrftdi_private.h"
#ifdef HAVE_LIBUSB_1_0
#ifdef HAVE_LIBFTDI1
#include <libusb-1.0/libusb.h>
#include <libftdi1/ftdi.h>
static void
avrftdi_debug_frame(uint16_t frame)
{
static char bit_name[] = "IDLES01234567PSS";
//static char bit_name[] = "SSP76543210SELDI";
char line0[34], line1[34], line2[34];
int bit, pos;
for(bit = 0; bit < 16; bit++)
{
pos = 16 - bit - 1;
if(frame & (1 << pos))
{
line0[2*pos] = '_';
line0[2*pos+1] = ' ';
line2[2*pos] = ' ';
line2[2*pos+1] = ' ';
}
else
{
line0[2*pos] = ' ';
line0[2*pos+1] = ' ';
line2[2*pos] = '-';
line2[2*pos+1] = ' ';
}
line1[2*pos] = bit_name[pos];
line1[2*pos+1] = ' ';
}
line0[32] = 0;
line1[32] = 0;
line2[32] = 0;
avrftdi_print(0, "%s\n", line0);
avrftdi_print(0, "%s\n", line1);
//avrftdi_print(0, "%s\n", line2);
}
int
avrftdi_tpi_initialize(PROGRAMMER * pgm, AVRPART * p)
{
int ret;
avrftdi_t* pdata = to_pdata(pgm);
unsigned char buf[] = { MPSSE_DO_WRITE | MPSSE_WRITE_NEG | MPSSE_LSB, 0x01, 0x00, 0xff, 0xff };
avrftdi_print(0, "Using TPI interface\n");
pgm->program_enable = avrftdi_tpi_program_enable;
pgm->cmd_tpi = avrftdi_cmd_tpi;
pgm->chip_erase = avrftdi_tpi_chip_erase;
//pgm->read_byte = avrftdi_tpi_read_byte;
//pgm->write_byte = avrftdi_tpi_write_byte;
avrftdi_print(0, "Setting /Reset pin low\n");
pdata->set_pin(pgm, PIN_AVR_RESET, OFF);
pdata->set_pin(pgm, PIN_AVR_SCK, OFF);
pdata->set_pin(pgm, PIN_AVR_MOSI, ON);
usleep(20 * 1000);
pdata->set_pin(pgm, PIN_AVR_RESET, ON);
/* worst case 128ms */
usleep(2 * 128 * 1000);
/*setting rst back to 0 */
pdata->set_pin(pgm, PIN_AVR_RESET, OFF);
/*wait at least 20ms bevor issuing spi commands to avr */
usleep(20 * 1000);
avrftdi_print(0, "Sending 16 init clock cycles ... ");
ret = ftdi_write_data(pdata->ftdic, buf, sizeof(buf));
avrftdi_print(0, "Done.\n");
return ret;
}
#define TPI_BIT_PAR 0x2000
static uint16_t
tpi_byte2frame(uint8_t byte)
{
uint16_t frame = 0xc00f;
int parity = __builtin_popcount(byte) & 1;
frame |= ((byte << 5) & 0x1fe0);
if(parity)
frame |= TPI_BIT_PAR;
return frame;
}
static int
tpi_frame2byte(uint16_t frame, uint8_t * byte)
{
/* drop partity + 2 stop bits */
*byte = (frame >> 1) & 0xff;
int parity = __builtin_popcount(*byte) & 1;
int parity_rcvd = (frame & 0x200) ? 1 : 0;
avrftdi_print(1, "Recevied frame with payload 0x%02x and parity %d.\n", *byte, parity);
return parity != parity_rcvd;
}
#define TPI_FRAME_SIZE 2
static int
avrftdi_tpi_break(PROGRAMMER * pgm)
{
unsigned char buffer[] = { MPSSE_DO_WRITE | MPSSE_WRITE_NEG | MPSSE_LSB, 1, 0, 0x80, 0x01 };
E(ftdi_write_data(to_pdata(pgm)->ftdic, buffer, sizeof(buffer)) != sizeof(buffer), to_pdata(pgm)->ftdic);
return 0;
}
static int
avrftdi_tpi_write_byte(PROGRAMMER * pgm, unsigned char byte)
{
uint16_t frame;
struct ftdi_context* ftdic = to_pdata(pgm)->ftdic;
unsigned char buffer[] = { MPSSE_DO_WRITE | MPSSE_WRITE_NEG | MPSSE_LSB, 1, 0, 0, 0 };
frame = tpi_byte2frame(byte);
buffer[3] = frame & 0xff;
buffer[4] = frame >> 8;
avrftdi_print(1, "TPI frame: 0x%02x 0x%02x, data byte 0x%02x\n",
buffer[6], buffer[7], byte);
avrftdi_print(2, "FTDI raw data: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
buffer[0], buffer[1], buffer[2], buffer[3], buffer[4] /*, buffer[5], buffer[6], buffer[7]*/);
avrftdi_debug_frame(frame);
E(ftdi_write_data(ftdic, buffer, sizeof(buffer)) != sizeof(buffer), ftdic);
return 0;
}
static int
avrftdi_tpi_read_byte(PROGRAMMER * pgm, unsigned char * byte)
{
uint16_t frame;
int guard_bits = to_pdata(pgm)->guard_bits;
int bytes = ((guard_bits + 7) / 8) + 2;
int i = 0, n = 0;
/* worst case size:
* - 128 guard bits
* - 2 default idle bits
* - 12 frame bits
* = 142 bits
*/
unsigned char buffer[bytes];
if(bytes > sizeof(buffer))
avrftdi_print(0, "Requested more bytes (%d) than available buffer space (%d)\n", bytes, sizeof(buffer));
avrftdi_print(1, "Guard bit size (incl. default idle bits) is %d\n", guard_bits);
avrftdi_print(1, "Reading %d bytes for guard bits + frame\n", bytes);
/* set it high, so the PDI won't detect we're driving the line */
to_pdata(pgm)->set_pin(pgm, PIN_AVR_MOSI, ON);
buffer[0] = MPSSE_DO_READ | MPSSE_WRITE_NEG | MPSSE_LSB;
buffer[1] = (bytes-1) & 0xff;
buffer[2] = ((bytes-1) >> 8) & 0xff;
buffer[3] = SEND_IMMEDIATE;
avrftdi_print(3, "Read request: 0x%02x 0x%02x 0x%02x 0x%02x\n",
buffer[0], buffer[1], buffer[2], buffer[3]);
ftdi_write_data(to_pdata(pgm)->ftdic, buffer, 4);
memset(buffer, 0, sizeof(buffer));
i = 0;
do {
n = ftdi_read_data(to_pdata(pgm)->ftdic, &buffer[i], bytes - i);
E(n < 0, to_pdata(pgm)->ftdic);
i += n;
} while(i < bytes);
/* dismiss at least (guard_bits / 8) bytes */
i = guard_bits / 8;
frame = buffer[i] | (buffer[i+1] << 8);
/* now shift the rest of guard bits out */
i = guard_bits - (i*8);
frame >>= i;
avrftdi_print(1, "Received frame 0x%04x (LSB first)\n", frame);
return tpi_frame2byte(frame, byte);
}
int
avrftdi_tpi_program_enable(PROGRAMMER * pgm, AVRPART * p)
{
int retry;
int err;
int i;
unsigned char byte = 0;
avrftdi_print(0, "TPI program enable\n");
//TODO determine guard time:
//-disable output possible -> guard time
//-else: minimum guard time
/* set guard time */
//avrftdi_tpi_write_byte(pgm, TPI_OP_SSTCS(TPIPCR));
//avrftdi_tpi_write_byte(pgm, TPIPCR_GT_2b);
/* send SKEY */
avrftdi_tpi_write_byte(pgm, TPI_CMD_SKEY);
for(i = sizeof(tpi_skey) - 1; i >= 0; --i)
avrftdi_tpi_write_byte(pgm, tpi_skey[i]);
/* check if device is ready */
for(retry = 0; retry < 10; retry++)
{
avrftdi_print(0, "Reading Identification register\n");
avrftdi_tpi_write_byte(pgm, TPI_OP_SLDCS(TPIIR));
err = avrftdi_tpi_read_byte(pgm, &byte);
if(err || byte != 0x80)
{
avrftdi_print(0, "Error. Sending break.\n");
avrftdi_tpi_break(pgm);
avrftdi_tpi_break(pgm);
continue;
}
avrftdi_print(0, "Reading Status register\n");
avrftdi_tpi_write_byte(pgm, TPI_OP_SLDCS(TPISR));
err = avrftdi_tpi_read_byte(pgm, &byte);
if(err || !(byte & TPISR_NVMEN))
{
avrftdi_print(0, "Error. Sending break.\n");
avrftdi_tpi_break(pgm);
avrftdi_tpi_break(pgm);
continue;
}
return 0;
}
avrftdi_print(0, "error connecting to target\n");
return -1;
}
static int
avrftdi_tpi_nvm_waitbusy(PROGRAMMER * pgm)
{
unsigned char byte;
int err;
int retry;
for(retry = 50; retry > 0; retry--)
{
avrftdi_tpi_write_byte(pgm, TPI_OP_SIN(NVMCSR));
err = avrftdi_tpi_read_byte(pgm, &byte);
if(err || (byte & NVMCSR_BSY))
continue;
return 0;
}
return -1;
}
int
avrftdi_cmd_tpi(PROGRAMMER * pgm, unsigned char cmd[], int cmd_len,
unsigned char res[], int res_len)
{
int i, err = 0;
for(i = 0; i < cmd_len; i++)
{
err = avrftdi_tpi_write_byte(pgm, cmd[i]);
if(err)
return err;
}
for(i = 0; i < res_len; i++)
{
err = avrftdi_tpi_read_byte(pgm, &res[i]);
if(err)
return err;
}
return 0;
}
int
avrftdi_tpi_chip_erase(PROGRAMMER * pgm, AVRPART * p)
{
/* Set PR to flash */
avrftdi_tpi_write_byte(pgm, TPI_OP_SSTPR(0));
avrftdi_tpi_write_byte(pgm, 0x01);
avrftdi_tpi_write_byte(pgm, TPI_OP_SSTPR(1));
avrftdi_tpi_write_byte(pgm, 0x40);
/* select ERASE */
avrftdi_tpi_write_byte(pgm, TPI_OP_SOUT(NVMCMD));
avrftdi_tpi_write_byte(pgm, NVMCMD_CHIP_ERASE);
/* dummy write */
avrftdi_tpi_write_byte(pgm, TPI_OP_SST_INC);
avrftdi_tpi_write_byte(pgm, 0x00);
avrftdi_tpi_nvm_waitbusy(pgm);
usleep(p->chip_erase_delay);
pgm->initialize(pgm, p);
return 0;
}
#else /*HAVE_LIBFTDI*/
#endif /* HAVE_LIBFTDI */
#else /*HAVE_LIBUSB*/
#endif /*HAVE_LIBUSB*/

14
avrftdi_tpi.h Normal file
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#pragma once
#include "pgm.h"
#include "avrpart.h"
//int avrftdi_tpi_write_byte(PROGRAMMER * pgm, unsigned char byte);
//int avrftdi_tpi_read_byte(PROGRAMMER * pgm, unsigned char * byte);
int avrftdi_tpi_program_enable(PROGRAMMER * pgm, AVRPART * p);
int avrftdi_tpi_chip_erase(PROGRAMMER * pgm, AVRPART * p);
int avrftdi_cmd_tpi(PROGRAMMER * pgm, unsigned char cmd[], int cmd_len,
unsigned char res[], int res_len);
int avrftdi_tpi_initialize(PROGRAMMER * pgm, AVRPART * p);