static void par_close(PROGRAMMER * pgm)
{
/*
* Restore pin values before closing,
* but ensure that buffers are turned off.
*/
ppi_setall(&pgm->fd, PPIDATA, pgm->ppidata);
ppi_setall(&pgm->fd, PPICTRL, pgm->ppictrl);
par_setmany(pgm, pgm->pinno[PPI_AVR_BUFF], 1);
/*
* Handle exit specs.
*/
switch (pgm->exit_reset) {
case EXIT_RESET_ENABLED:
par_setpin(pgm, pgm->pinno[PIN_AVR_RESET], 0);
break;
case EXIT_RESET_DISABLED:
par_setpin(pgm, pgm->pinno[PIN_AVR_RESET], 1);
break;
case EXIT_RESET_UNSPEC:
/* Leave it alone. */
break;
}
switch (pgm->exit_datahigh) {
case EXIT_DATAHIGH_ENABLED:
ppi_setall(&pgm->fd, PPIDATA, 0xff);
break;
case EXIT_DATAHIGH_DISABLED:
ppi_setall(&pgm->fd, PPIDATA, 0x00);
break;
case EXIT_DATAHIGH_UNSPEC:
/* Leave it alone. */
break;
}
switch (pgm->exit_vcc) {
case EXIT_VCC_ENABLED:
par_setmany(pgm, pgm->pinno[PPI_AVR_VCC], 1);
break;
case EXIT_VCC_DISABLED:
par_setmany(pgm, pgm->pinno[PPI_AVR_VCC], 0);
break;
case EXIT_VCC_UNSPEC:
/* Leave it alone. */
break;
}
ppi_close(&pgm->fd);
pgm->fd.ifd = -1;
}
static void par_setmany(PROGRAMMER * pgm, unsigned int pinset, int value)
{
int pin;
for (pin = 1; pin <= 17; pin++) {
if (pinset & (1 << pin))
par_setpin(pgm, pin, value);
}
}
static void par_setmany(PROGRAMMER * pgm, unsigned int pinset, int value)
{
int pin, mask;
/* mask is anything non-pin - needs to be applied to each par_setpin to preserve inversion */
mask = pinset & (~PIN_MASK);
for (pin = 1; pin <= 17; pin++) {
if (pinset & (1 << pin))
par_setpin(pgm, pin | mask, value);
}
}
static void par_enable(PROGRAMMER * pgm)
{
/*
* Prepare to start talking to the connected device - pull reset low
* first, delay a few milliseconds, then enable the buffer. This
* sequence allows the AVR to be reset before the buffer is enabled
* to avoid a short period of time where the AVR may be driving the
* programming lines at the same time the programmer tries to. Of
* course, if a buffer is being used, then the /RESET line from the
* programmer needs to be directly connected to the AVR /RESET line
* and not via the buffer chip.
*/
par_setpin(pgm, pgm->pinno[PIN_AVR_RESET], 0);
usleep(1);
/*
* enable the 74367 buffer, if connected; this signal is active low
*/
par_setmany(pgm, pgm->pinno[PPI_AVR_BUFF], 0);
}
