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avrdude/avrftdi_tpi.c

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#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;
log_debug("%s\n", line0);
log_debug("%s\n", line1);
//log_debug("%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 };
log_info("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;
log_info("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);
log_info("Sending 16 init clock cycles ... ");
ret = ftdi_write_data(pdata->ftdic, buf, sizeof(buf));
log_info("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;
log_info("Recevied frame with payload 0x%02x and %s parity\n",
*byte, parity ? "odd" : "even");
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, 0, 0 };
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;
log_debug("TPI frame: 0x%02x 0x%02x, data byte 0x%02x\n",
buffer[6], buffer[7], byte);
log_debug("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[18];
if(bytes > sizeof(buffer))
log_warn("Requested more bytes (%d) than available buffer space (%d)\n", bytes, sizeof(buffer));
log_info("Guard bit size (incl. default idle bits) is %d\n", guard_bits);
log_info("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;
log_info("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;
log_info("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;
log_info("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++)
{
log_info("Reading Identification register\n");
avrftdi_tpi_write_byte(pgm, TPI_OP_SLDCS(TPIIR));
err = avrftdi_tpi_read_byte(pgm, &byte);
if(err || byte != 0x80)
{
log_warn("Error. Sending break.\n");
avrftdi_tpi_break(pgm);
avrftdi_tpi_break(pgm);
continue;
}
log_info("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))
{
log_warn("Error. Sending break.\n");
avrftdi_tpi_break(pgm);
avrftdi_tpi_break(pgm);
continue;
}
return 0;
}
log_err("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*/
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