thermocouple/firmware/masterchip/usb.c

#include "main.h"
#include "spi.h"
#include "spi_proto.h"
#include "usb.h"

usbMsgLen_t usbFunctionSetup(uchar data[8]) {
  usbRequest_t    *rq = (void *)data;
  static uchar    dataBuffer[4];

  if(rq->bRequest == 100) {
    dataBuffer[0] = (thermoData [0] & 0xff00)>>8;
    dataBuffer[1] = thermoData [0] & 0x00ff;
    dataBuffer[2] = (thermoData [1] & 0xff00)>>8;
    dataBuffer[3] = thermoData [1] & 0x00ff;
    usbMsgPtr = dataBuffer;
    return 4;
  } else if(rq->bRequest == 101) {
    dataBuffer[0] = (thermoData [2] & 0xff00)>>8;
    dataBuffer[1] = thermoData [2] & 0x00ff;
    dataBuffer[2] = (thermoData [3] & 0xff00)>>8;
    dataBuffer[3] = thermoData [3] & 0x00ff;
    usbMsgPtr = dataBuffer;
    return 4;
  } else {
    uint8_t opcode = (uint8_t)  ((rq->bRequest & 0xff00)>>8);
    uint8_t addr =   (uint8_t)    rq->wValue.bytes[0];
    uint8_t valH =   (uint8_t)    rq->wIndex.bytes[0];
    uint8_t valL =   (uint8_t)    rq->wIndex.bytes[1];

    uint16_t send = (valH << 8) | valL;
    uint16_t recv = speak_raw(opcode, addr, spi_proto_needs(opcode), send);
    
    dataBuffer[0] = (recv >> 8) & 0xff;
    dataBuffer[1] = recv & 0xff;
    dataBuffer[2] = 0x0000;
    dataBuffer[3] = 0x0000;
    usbMsgPtr = dataBuffer;
    return 4;
    
  }

  return 0;
}