avrdude/src/avrftdi_tpi.c

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5.4 KiB
C
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#include "ac_cfg.h"
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "avrdude.h"
#include "libavrdude.h"
#include "usbasp.h"
#include "avrftdi_tpi.h"
#include "avrftdi_private.h"
#ifndef DO_NOT_BUILD_AVRFTDI
static void avrftdi_tpi_disable(PROGRAMMER *);
static int avrftdi_tpi_program_enable(PROGRAMMER * pgm, AVRPART * p);
#ifdef notyet
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);
}
#endif /* notyet */
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 = avr_tpi_chip_erase;
pgm->disable = avrftdi_tpi_disable;
pgm->paged_load = NULL;
pgm->paged_write = NULL;
log_info("Setting /Reset pin low\n");
pgm->setpin(pgm, PIN_AVR_RESET, OFF);
pgm->setpin(pgm, PIN_AVR_SCK, OFF);
pgm->setpin(pgm, PIN_AVR_MOSI, ON);
usleep(20 * 1000);
pgm->setpin(pgm, PIN_AVR_RESET, ON);
/* worst case 128ms */
usleep(2 * 128 * 1000);
/*setting rst back to 0 */
pgm->setpin(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 ...\n");
ret = ftdi_write_data(pdata->ftdic, buf, sizeof(buf));
return ret;
}
#define TPI_PARITY_MASK 0x2000
static inline int count1s(unsigned int x)
{
#if defined(__GNUC__)
return __builtin_popcount(x);
#else
int count = 0;
while (x)
{
count += x & 1;
x >>= 1;
}
return count;
#endif
}
static uint16_t
tpi_byte2frame(uint8_t byte)
{
uint16_t frame = 0xc00f;
int parity = count1s(byte) & 1;
frame |= ((byte << 5) & 0x1fe0);
if(parity)
frame |= TPI_PARITY_MASK;
return frame;
}
static int
tpi_frame2byte(uint16_t frame, uint8_t * byte)
{
/* drop idle and start bit(s) */
*byte = (frame >> 5) & 0xff;
int parity = count1s(*byte) & 1;
int parity_rcvd = (frame & TPI_PARITY_MASK) ? 1 : 0;
return parity != parity_rcvd;
}
#ifdef notyet
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;
}
#endif /* notyet */
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_trace("Byte %02x, frame: %04x, MPSSE: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
byte, frame, buffer[0], buffer[1], buffer[2], buffer[3], buffer[4]);
//avrftdi_debug_frame(frame);
E(ftdi_write_data(ftdic, buffer, sizeof(buffer)) != sizeof(buffer), ftdic);
return 0;
}
#define TPI_FRAME_SIZE 12
#define TPI_IDLE_BITS 2
static int
avrftdi_tpi_read_byte(PROGRAMMER * pgm, unsigned char * byte)
{
uint16_t frame;
/* use 2 guard bits, 2 default idle bits + 12 frame bits = 16 bits total */
const int bytes = 3;
int err, i = 0;
unsigned char buffer[4];
buffer[0] = MPSSE_DO_READ | MPSSE_LSB;
buffer[1] = (bytes-1) & 0xff;
buffer[2] = ((bytes-1) >> 8) & 0xff;
buffer[3] = SEND_IMMEDIATE;
log_trace("MPSSE: 0x%02x 0x%02x 0x%02x 0x%02x (Read frame)\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 {
int err = ftdi_read_data(to_pdata(pgm)->ftdic, &buffer[i], bytes - i);
E(err < 0, to_pdata(pgm)->ftdic);
i += err;
} while(i < bytes);
log_trace("MPSSE: 0x%02x 0x%02x 0x%02x 0x%02x (Read frame)\n",
buffer[0], buffer[1], buffer[2], buffer[3]);
frame = buffer[0] | (buffer[1] << 8);
err = tpi_frame2byte(frame, byte);
log_trace("Frame: 0x%04x, byte: 0x%02x\n", frame, *byte);
//avrftdi_debug_frame(frame);
return err;
}
static int
avrftdi_tpi_program_enable(PROGRAMMER * pgm, AVRPART * p)
{
return avr_tpi_program_enable(pgm, p, TPIPCR_GT_2b);
}
int
avrftdi_cmd_tpi(PROGRAMMER * pgm, const 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;
}
static void
avrftdi_tpi_disable(PROGRAMMER * pgm)
{
unsigned char cmd[] = {TPI_OP_SSTCS(TPIPCR), 0};
pgm->cmd_tpi(pgm, cmd, sizeof(cmd), NULL, 0);
log_info("Leaving Programming mode.\n");
}
#endif /* DO_NOT_BUILD_AVRFTDI */