Cannot get SD card to work

I haven't got the breakout yet, so I'm struggling to debug exactly why it's working on a Pico but not the Wifi.

You could maybe try adding a timeout after setting up the SD card - that's about the only thing I can think would really be different. You're using hardware SPI so it'd not like it'll be going too fast or anything.

function onInit() {
 console.log("Connected!");
 // Wire up up MOSI, MISO, SCK and CS pins (along with 3.3v and GND)
 SPI1.setup({mosi:B5, miso:B4, sck:B3});
 E.connectSDCard(SPI1, B6 /*CS*/);
 setTimeout(function(){
  // see what's on the device
  console.log(require("fs").readdirSync())­;  
  for (var i in files)
    console.log("Found file "+files[i]);
  var f = E.openFile("log.txt", "w");
  f.write("Testing 123");
  f.close();
  
  f = E.openFile("log.txt", "r");
  f.pipe(console.log);
  f.close();
 },2000);
}