Using Shift-Out from SX28 to Shift-In on SX48

John Bond

Hi Guys
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PLEASE HELP!!!
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I am trying to pass a byte from an SX28 to an SX48 development board using the Shift-Out and Shift-In commands. I can’t get it to work.
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What am I doing wrong…
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From>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
DEVICE········· SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ··········· 4_000_000
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Dpin·········· VAR···· RA.0·········· ' shift data
Cpin·········· VAR···· RA.1·········· ' shift clock
Latch········· VAR···· RA.2·········· ' latch outputs
LED······ ··· ·VAR· RB.0
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temp1········· VAR···· Byte
ShiftChar····· VAR···· Byte
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watch counter, 8, udec
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' ====================================================
· PROGRAM Start
' ====================================================
·
'

---

' Subroutine Declarations
'

---

ShiftItOut········· SUB···· 1········ ' pass value out
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Start:
ShiftChar = 123
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TRIS_B = %00000000
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Main:
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··· ShiftItout ShiftChar ···' transfer data
break··································
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···· toggle LED
···· pause 20
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GOTO main
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ShiftItout:
· temp1 = __PARAM1····· ··········' capture value
· SHIFTOUT Dpin, Cpin, 0, temp1·· ' send the bits
· PULSOUT Latch, 2·············· ·' transfer to outputs
· RETURN
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·


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To>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
DEVICE········· SX48, OSC4MHZ,
FREQ··········· 4_000_000
·
·
Dpin··········· VAR···· RA.1····· ' shift data
Cpin··········· VAR···· RA.2····· ' shift clock
Latch·········· VAR···· RA.3····· ' latch outputs
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temp1·········· VAR···· Byte
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watch temp1, 8, udec
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' ===================================================
· PROGRAM Start
' ===================================================\
Start:
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TRIS_A = %11111111
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Main:
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SHIFTIN DPin, CPin, 0, temp1
break··································
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GOTO main

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Peter Verkaik

Your shiftIn code must act as slave, that is it must receive the clock,
not generate the clock. The clock is generated by the shiftOut.
The SX/B shiftIn is only master. You probably need a VP written in assembly,
but perhaps someone has a SX/B version of a SPI slave.

Go to
http://www.sxlist.com/techref/ubicom/virtperf.htm
and scroll down to SX to SX spi interface

regards peter

John Bond

Thanks Peter - That article makes it clear

So my options seem to be:
- Get a slave spi or write one (I'm not keen to write one, i also only work in SX/B)
- Use a UART (seems overkill for 1 byte)
- Write my own proprietry shift register

Kind regards from the Dark Continent

John Bond

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Bean

John,
Just send the value using SEROUT and SERIN instead of SHIFTOUT and SHIFTIN.

Bean.

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John Bond

Thanks Bean

- That also means wne the system expands, I can have a single sender and many receivers and use 2 bytes, 1 to identify the address and the 2nd as the control byte...

You know, I am fast asleep today.

John Bond

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