#!/usr/bin/env python
# GoodFET Client Application
# 
# (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
#
# This code is ugly as sin, for bootstrapping the firmware only.
# Rewrite cleanly as soon as is convenient.

import sys, time, string, cStringIO, struct
sys.path.append("/usr/lib/tinyos")
import serial


class Client:
    def __init__(self, *args, **kargs):
        print "inited\n";
    def timeout(self):
        print "timout\n";
    def serInit(self, port):
        """Open the serial port"""
        self.serialport = serial.Serial(
            port,
            9600,
            parity = serial.PARITY_NONE
            )
        #Drop DTR, which is !RST, low to begin the app.
        self.serialport.setDTR(0);
        self.serialport.flushInput()
        self.serialport.flushOutput()
        
        #Read and handle the initial command.
        time.sleep(1);
        client.readcmd(); #Read the first command.
        if(self.verb!=0x7F):
            print "Verb is wrong.  Incorrect firmware?";
        
        
    def writecmd(self, app, verb, count, data):
        """Write a command and some data to the GoodFET."""
        self.serialport.write(chr(app));
        self.serialport.write(chr(verb));
        self.serialport.write(chr(count));
        #print "count=%02x, len(data)=%04x" % (count,len(data));
        if count!=0:
            for d in data:
                self.serialport.write(chr(d));
        self.readcmd();  #Uncomment this later, to ensure a response.
    def readcmd(self):
        """Read a reply from the GoodFET."""
        self.app=ord(self.serialport.read(1));
        self.verb=ord(self.serialport.read(1));
        self.count=ord(self.serialport.read(1));
        if self.count>0:
            self.data=self.serialport.read(self.count);
        #print "%02x %02x %02x" % (self.app, self.verb, self.count);
    
    #Monitor stuff
    def peekbyte(self,address):
        """Read a byte of memory from the monitor."""
        self.data=[address&0xff,address>>8];
        self.writecmd(0,0x02,2,self.data);
        #self.readcmd();
        return ord(self.data[0]);
    def peekword(self,address):
        """Read a word of memory from the monitor."""
        return self.peekbyte(address)+(self.peekbyte(address+1)<<8);
    def pokebyte(self,address,value):
        """Set a byte of memory by the monitor."""
        self.data=[address&0xff,address>>8,value];
        self.writecmd(0,0x03,3,self.data);
        return ord(self.data[0]);
    
    def monitortest(self):
        """Self-test several functions through the monitor."""
        print "Performing self-test.";
        
        if self.peekword(0x0c00)!=0x0c04:
            print "ERROR Fetched wrong value from 0x0c04.";
        self.pokebyte(0x0021,0); #Drop LED
        if self.peekbyte(0x0021)!=0:
            print "ERROR, P1OUT not cleared.";
        self.pokebyte(0x0021,1); #Light LED
        
        print "Self-test complete.";
    
    def spisetup(self):
        """Moved the FET into the SPI application."""
        print "Initializing SPI.";
        self.writecmd(1,0x10,0,self.data); #SPI/SETUP
        #self.readcmd();
    def spitrans8(self,byte):
        """Read and write 8 bits by SPI."""
        self.data=[byte];
        self.writecmd(1,0,1,self.data);    #SPI exchange
        #self.readcmd();
        
        if self.app!=1 or self.verb!=0:
            print "Error in SPI transaction; app=%02x, verb=%02x" % (self.app, self.verb);
        return ord(self.data[0]);

client=Client();
client.serInit("/dev/ttyUSB0")

client.monitortest();

client.spisetup();
while 1:
    print "%02x" % client.spitrans8(5);
    time.sleep(0.1);