// Switch to overdrive speed -- 3 tries
static GOOD_OR_BAD DS9490_overdrive(const struct parsedname *pn)
{
BYTE sp = _1W_OVERDRIVE_SKIP_ROM;
BYTE resp;
int i;
// we need to change speed to overdrive
for (i = 0; i < 3; i++) {
LEVEL_DATA("set overdrive speed. Attempt %d",i);
if ( BAD( gbRESET(BUS_reset(pn)) ) ) {
continue;
}
if ( BAD( DS9490_sendback_data(&sp, &resp, 1, pn) ) || (_1W_OVERDRIVE_SKIP_ROM != resp) ) {
LEVEL_DEBUG("error setting overdrive %.2X/0x%02X", _1W_OVERDRIVE_SKIP_ROM, resp);
continue;
}
if ( GOOD( USB_Control_Msg(MODE_CMD, MOD_1WIRE_SPEED, ONEWIREBUSSPEED_OVERDRIVE, pn)) ) {
LEVEL_DEBUG("speed is now set to overdrive");
return gbGOOD;
}
}
LEVEL_DEBUG("Error setting overdrive after 3 retries");
return gbBAD;
}
// do the configuration stuff
static GOOD_OR_BAD DS2480_big_configuration(struct connection_in * in)
{
BYTE single_bit = CMD_COMM | BITPOL_ONE | DS2480b_speed_byte(in) ;
BYTE single_bit_response ;
// Now set desired baud and polarity
// BUS_reset will do the actual changes
in->changed_bus_settings = 1 ; // Force a mode change
// Send a reset again
DS2480_reset_in(in) ;
// delay to let line settle
UT_delay(4);
// default W1LT = 10us (write-1 low time)
RETURN_BAD_IF_BAD(DS2480_configuration_write(PARMSEL_WRITE1LOW, PARMSET_Write10us, in)) ;
// default DSO/WORT = 8us (data sample offset / write 0 recovery time )
RETURN_BAD_IF_BAD(DS2480_configuration_write(PARMSEL_SAMPLEOFFSET, PARMSET_SampOff8us, in)) ;
// Strong pullup duration = infinite
RETURN_BAD_IF_BAD(DS2480_configuration_write(PARMSEL_5VPULSE, PARMSET_infinite, in)) ;
// Program pulse duration = 512usec
RETURN_BAD_IF_BAD(DS2480_configuration_write(PARMSEL_12VPULSE, PARMSET_512us, in)) ;
// Send a single bit
// The datasheet wants this
RETURN_BAD_IF_BAD(DS2480_sendback_cmd(&single_bit, &single_bit_response, 1, in)) ;
/* Apparently need to reset again to get the version number properly */
return gbRESET( DS2480_reset_in(in) ) ;
}