read accelerometer(LIS302DL) on STM32F4DISCOVERY ?

STM32F4 DISCOVERY and Version 1v51
Data is sent and received but ZERO is got from the Javascript side.

function onInit() {
  SPI1.setup({ mode:0, sck: A5, miso: A6, mosi: A7, cs: E3 } );
  SPI1.send([0x20,0b01000111], E3);
  getAcc();
}

var avrx=0.0, avry=0.0;
function getAcc(){
  var accx = SPI1.send([0xA9,0], E3)[1];
  var accy = SPI1.send([0xAB,0], E3)[1];
  if (accx>127) accx-=256; 
  if (accy>127) accy-=256;
  avrx = 0.1*accx + 0.9*avrx;
  avry = 0.1*accy + 0.9*avry;
  console.log("X= "+accx+" Y= "+accy);
  
}
onInit();

1 Attachment