Pins that don't play well together

Aaahahhaaha! This is so cool...

var fs=require("fs");
fs.readdir();  //This will work
analogWrite(A8,0);
fs.readdir(); //This will not
poke16(0x40012C20,peek16(0x40012c20)&0xFBBB); //turn off all the negated outputs on TIM1
fs.readdir(); // Works again!

Of course, every time you call analogWrite(A8), it gets reset...

Here we go - PWM on A8~10 without clobbering SPI2. If you enable PWM for A9 or A10, it'll move the USART out of the way, too.

//pass true for each pin you want to use. 

function PWMsetup(a8,a9,a10) {
  if (a8) {
    analogWrite(A8,0);
  }
  if (a9||a10) {
    poke8(0x40010004,peek8(0x40010004)|4); //move the USART out of the way
  }
  if (a9) {
    analogWrite(A9,0);
  }
  if (a10) {
    analogWrite(A10,0);
  }
  poke16(0x40012C20,peek16(0x40012c20)&0xFBBB);
}

function A8PWM(val) {
  poke16(0x40012C34,E.clip(val*65535,0,65535));
}
function A9PWM(val) {
  poke16(0x40012C38,E.clip(val*65535,0,65535));
}
function A10PWM(val) {
  poke16(0x40012C3C,E.clip(val*65535,0,65535));
}