Example code for writing to a shift register via SPI

spiShiftRegister.device.nut

// Shift Register via SPI Example
 
// Configure Hardware
// Pin 1 is the reset line and should be high unless driven low

hardware.pin1.configure(DIGITAL_OUT_OD_PULLUP);

// Pin 8 is the output enable line and should also be high unless driven low

hardware.pin8.configure(DIGITAL_OUT_OD_PULLUP);
 
// Configure the operating parameters of the SPI bus

hardware.spi257.configure(SIMPLEX_TX | MSB_FIRST | CLOCK_IDLE_LOW, 400);
 
// Function to reset the shift registers

function clear() 
{
    hardware.pin1.write(0);
    imp.sleep(0.1);
    hardware.pin1.write(1);
}
 
// Function to send out some data

function send(data) 
{
    // Make sure the output is disabled before we start clocking out data
    hardware.pin8.write(1);
  
    // Now send the data
    hardware.spi257.write(data);
  
    // Last, re-enable the output
    hardware.pin8.write(0);
}
 
// Clear the shift registers and send some data

clear();

// Create a four-byte blob and write a 32-bit number to it

local value = blob(4); 
value.writen(0xDEADBEEF,'i');

// Pass it to the send() function

send(value);

This no longer works. When running as device code you get 'DIGITAL_OUT_PULLUP' does not exist

Now (at long last) fixed, @pcon.