What am I doing wrong?

bboy8012 · 2007-12-25 07:52

Frustrated beyond believe!

 
CON
  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000
  gpsTx = 21
  gpsRx = 20
  gpsBaud = 4800

                'GPS Commands
  GetInfo = $00 
  GetValid = $01
  GetSats = $02
  GetTime = $03
  GetDate = $04
  GetLat = $05
  GetLong = $06
  GetAlt = $07
  GetSpeed = $08
  GetHead = $09
VAR
  byte info[noparse][[/noparse]2], valid[noparse][[/noparse]1], sats[noparse][[/noparse]1], time[noparse][[/noparse]3], date[noparse][[/noparse]3]
  word heading[noparse][[/noparse]2], speed[noparse][[/noparse]2], alt[noparse][[/noparse]2], lat[noparse][[/noparse]5], lon[noparse][[/noparse]5] 
OBJ
  uart  :       "Simple_Serial"
  debug :       "FullDuplexSerial"
PUB Delay(mS)
  waitcnt((clkfreq / 1000 * mS) + cnt)
PUB main
  debug.start(31, 30, 0, 19200)
  waitcnt (1_000_000 * 25 + cnt )
  
  uart.start(gpsRx, gpsTx, gpsBaud)
  waitcnt (1_000_000 * 25 + cnt )
  
  repeat
    uart.tx(String("!GPS"))
    uart.tx(GetInfo)
    
     info := uart.rx
    debug.str(@info)
    debug.str(13)
    debug.str(10)

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Hunger hurts, starvation works!

deSilva · 2007-12-25 09:25

.rx receives just ONE BYTE, not a string.
SimpleSerial does not buffer any bytes, so you will generally miss data when using speeds above - say - 300 baud.
You generally use .rx in a tight loop (you have around 5 to 10 simple SPIN lines during the 9600 baud stop-bit time slot - no calling routines or such!)
You can also use a separate COG for that loop.
In that situation however you should use "FullDuplex", which does exactly that. FullDuplex can be instantiated multiple times.

---
Edit: Are you really sure, the GPS commands are binary? Would be strange...

Post Edited (deSilva) : 12/25/2007 9:31:20 AM GMT

bboy8012 · 2007-12-25 16:27

I thought that was the Hex

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Hunger hurts, starvation works!

rjo_ · 2007-12-25 18:45

Your are in Smart mode... so raw is left floating. Correct?

Rich

rjo_ · 2007-12-25 19:32

this code by Gary Boone works in smart mode... I have 660 ohm in line between sio and the pin...
http://forums.parallax.com/forums/default.aspx?f=25&m=195562

deSilva · 2007-12-25 21:37

o.k. good piece of software from Gary.

@bboy: So most of my criticism was rather principally than to the point; what is left is:
Change:

debug.str(@info)

by

debug.hex(info)

bboy8012 · 2007-12-26 04:28

Thanks for the help

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Hunger hurts, starvation works!

What am I doing wrong?

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