/* PAged access -- pre-screened */
static GOOD_OR_BAD OW_w_mem(BYTE * data, size_t size, off_t offset, struct parsedname *pn)
{
BYTE p[4 + 32] = { _1W_WRITE_SCRATCHPAD, LOW_HIGH_ADDRESS(offset), };
struct transaction_log tcopy[] = {
TRXN_START,
TRXN_WRITE3(p),
TRXN_WRITE(data, size),
TRXN_END,
};
struct transaction_log tread[] = {
TRXN_START,
TRXN_WRITE1(p),
TRXN_READ(&p[1], 3 + size),
TRXN_COMPARE(data, &p[4], size),
TRXN_END,
};
struct transaction_log tsram[] = {
TRXN_START,
TRXN_WRITE(p, 4),
TRXN_DELAY(32),
TRXN_END,
};
/* Copy to scratchpad */
RETURN_BAD_IF_BAD(BUS_transaction(tcopy, pn)) ;
/* Re-read scratchpad and compare */
p[0] = _1W_READ_SCRATCHPAD;
RETURN_BAD_IF_BAD(BUS_transaction(tread, pn)) ;
/* Copy Scratchpad to SRAM */
p[0] = _1W_COPY_SCRATCHPAD;
return BUS_transaction(tsram, pn) ;
}
/* send A/D conversion command */
static GOOD_OR_BAD OW_convert( int simul_good, int delay, struct parsedname *pn)
{
BYTE convert[] = { _1W_CONVERT, 0x0F, 0x00, 0xFF, 0xFF, };
struct transaction_log tpower[] = {
TRXN_START,
TRXN_WR_CRC16(convert, 3, 0),
TRXN_END,
};
struct transaction_log tdead[] = {
TRXN_START,
TRXN_WRITE3(convert),
TRXN_READ1(&convert[3]),
TRXN_POWER( &convert[4], delay ) ,
TRXN_CRC16(convert, 5),
TRXN_END,
};
/* See if a conversion was globally triggered */
if ( GOOD(OW_get_power(pn) ) ) {
if ( simul_good ) {
return FS_Test_Simultaneous( simul_volt, delay, pn) ;
}
// Start conversion
// 6 msec for 16bytex4channel (5.2)
RETURN_BAD_IF_BAD(BUS_transaction(tpower, pn));
UT_delay(delay); /* don't need to hold line for conversion! */
} else {
// Start conversion
// 6 msec for 16bytex4channel (5.2)
RETURN_BAD_IF_BAD(BUS_transaction(tdead, pn)) ;
}
return gbGOOD;
}
/* write alarm settings */
static GOOD_OR_BAD OW_w_s_alarm(const BYTE * data, const struct parsedname *pn)
{
BYTE old_register[6];
BYTE new_register[6];
BYTE control_value[1];
BYTE alarm_access[] = { _1W_WRITE_CONDITIONAL_SEARCH_REGISTER,
LOW_HIGH_ADDRESS(_ADDRESS_ALARM_REGISTERS),
};
struct transaction_log t[] = {
TRXN_START,
TRXN_WRITE3(alarm_access),
TRXN_WRITE2(data),
TRXN_WRITE1(control_value),
TRXN_END,
};
// get the existing register contents
RETURN_BAD_IF_BAD( OW_r_reg(old_register, pn) ) ;
control_value[0] = (data[2] & 0x03) | (old_register[5] & 0x0C);
RETURN_BAD_IF_BAD(BUS_transaction(t, pn)) ;
/* Re-Read registers */
RETURN_BAD_IF_BAD(OW_r_reg(new_register, pn)) ;
return (data[0] != new_register[3]) || (data[1] != new_register[4])
|| (control_value[0] != (new_register[5] & 0x0F)) ? gbBAD : gbGOOD;
}
static GOOD_OR_BAD OW_w_pio(const BYTE data, const struct parsedname *pn)
{
BYTE write_string[] = { _1W_CHANNEL_ACCESS_WRITE, data, (BYTE) ~ data, };
BYTE read_back[2];
struct transaction_log t[] = {
TRXN_START,
TRXN_WRITE3(write_string),
TRXN_READ2(read_back),
TRXN_END,
};
if ( BAD(BUS_transaction(t, pn)) ) {
// may be in test mode, which causes Channel Access Write to fail
// fix now, but need another attempt to see if will work
OW_out_of_test_mode(pn) ;
return gbBAD ;
}
if (read_back[0] != 0xAA) {
return gbBAD;
}
/* Ignore byte 5 read_back[1] the PIO status byte */
return gbGOOD;
}
/* No CRC -- 0xF0 code */
GOOD_OR_BAD COMMON_read_memory_F0(struct one_wire_query *owq, size_t page, size_t pagesize)
{
off_t offset = OWQ_offset(owq) + page * pagesize;
BYTE p[3] = { _1W_READ_F0, LOW_HIGH_ADDRESS(offset), };
struct transaction_log t[] = {
TRXN_START,
TRXN_WRITE3(p),
TRXN_READ((BYTE *) OWQ_buffer(owq), OWQ_size(owq)),
TRXN_END,
};
Set_OWQ_length(owq);
return BUS_transaction(t, PN(owq));
}
// use new read_all command
static GOOD_OR_BAD OW_r_all(BYTE * data, size_t size, off_t offset, struct parsedname *pn)
{
BYTE p[4] = { _1W_READ_ALL, LOW_HIGH_ADDRESS(offset), };
struct transaction_log t[] = {
TRXN_START,
TRXN_WRITE3(p),
TRXN_READ1(&p[3]),
TRXN_CRC8(p, 4),
TRXN_READ(data, size),
};
RETURN_BAD_IF_BAD(BUS_transaction(t, pn)) ;
return gbGOOD;
}
// reads to end of page and discards extra
// uses CRC8
static GOOD_OR_BAD OW_r_page(BYTE * data, size_t size, off_t offset, struct parsedname *pn)
{
BYTE p[4] = { _1W_READ_DATA_CRC8, LOW_HIGH_ADDRESS(offset), };
BYTE q[33];
int rest = 33 - (offset & 0x1F);
struct transaction_log t[] = {
TRXN_START,
TRXN_WRITE3(p),
TRXN_READ1(&p[3]),
TRXN_CRC8(p, 4),
TRXN_READ(q, rest),
TRXN_CRC8(q, rest),
TRXN_END,
};
RETURN_BAD_IF_BAD(BUS_transaction(t, pn)) ;
memcpy(data, q, size);
return gbGOOD;
}
static GOOD_OR_BAD OW_r_std(BYTE *buf, size_t *buflen, BYTE type, BYTE stype, const struct parsedname *pn)
{
BYTE p[3] = { _1W_READ_MOAT, type,stype };
size_t maxlen = *buflen;
BYTE len;
GOOD_OR_BAD ret = gbGOOD;
struct transaction_log tfirst[] = {
TRXN_START,
TRXN_WRITE3(p),
TRXN_READ1(&len),
TRXN_END,
};
if (maxlen == 0) {
return gbGOOD;
}
LEVEL_DEBUG( "read: read len for %d %d",type,stype) ;
/* 0xFF means the device was too slow */
if ( BAD(BUS_transaction(tfirst, pn)) || len == 0xFF) {
goto out_bad;
}
LEVEL_DEBUG( "read: got len %d",len) ;
if (len > maxlen) {
/* don't read all and don't bother with CRC.
* This will abort the read on the client side so that
* there'll be no side effects like marked-as-sent buffers
* or cleared 'conditional search' flags */
struct transaction_log tinfo[] = {
TRXN_READ(buf,maxlen),
TRXN_END,
};
if ( BAD(BUS_transaction(tinfo, pn)) ) {
goto out_bad;
}
} else {
UINT crc;
BYTE crcbuf[2];
struct transaction_log recv_buf[] = {
TRXN_READ(buf,len),
TRXN_READ2(crcbuf),
TRXN_END,
};
struct transaction_log recv_crc[] = {
TRXN_READ2(crcbuf),
TRXN_END,
};
struct transaction_log xmit_crc[] = {
TRXN_WRITE2(crcbuf),
TRXN_END,
};
if ( BAD(BUS_transaction(len ? recv_buf : recv_crc, pn)) ) {
goto out_bad;
}
crc = CRC16compute(p,3,0);
crc = CRC16compute(&len,1,crc);
if (len) crc = CRC16compute(buf,len,crc);
LEVEL_DEBUG( "read CRC: GOOD, got %02x%02x",crcbuf[0],crcbuf[1]) ;
if ( CRC16seeded (crcbuf,2,crc) ) {
LEVEL_DEBUG("CRC error");
goto out_bad;
}
crcbuf[0] = ~crcbuf[0];
crcbuf[1] = ~crcbuf[1];
if ( BAD(BUS_transaction(xmit_crc, pn)) ) {
goto out_bad;
}
*buflen = len;
}
LEVEL_DEBUG( "read: GOOD, got %d",*buflen) ;
return ret;
out_bad:
return gbBAD;
}
