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

Comments

• Peter Verkaik Posts: 3,956

  2007-02-09 09:24 edited 2007-02-09 09:24

  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 Posts: 369

  2007-02-09 09:48 edited 2007-02-09 09:48

  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 Posts: 8,129

  2007-02-09 12:20 edited 2007-02-09 12:20

  John,
  Just send the value using SEROUT and SERIN instead of SHIFTOUT and SHIFTIN.
  
  Bean.
  
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• John Bond Posts: 369

  2007-02-09 13:24 edited 2007-02-09 13:24

  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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