dumpconsole.py

import framebuf
import uio

HEX="0123456789ABCDEF"

class DumpConsole(uio.IOBase):
    def __init__(self, fb, bgcolor=0, fgcolor=-1, width=-1, height=-1, readobj=None):
        self.readobj = readobj
        self.fb = fb
        if width > 0:
            self.width=width
        else:
            try:
                self.width=fb.width
            except:
                raise ValueError
        if height > 0:
            self.height=height
        else:
            try:
                self.height=fb.height
            except:
                raise ValueError
        self.bgcolor = bgcolor
        self.fgcolor = fgcolor
        self.line_height(8)

    def cls(self):
        self.x = 0
        self.y = 0
        self.fb.fill(self.bgcolor)
        try:
            self.fb.show()
        except:
            pass

    def line_height(self, px):
        self.lineheight = px
        self.w =  self.width // px
        self.h =  self.height // px
        self.cls()

    def _putc(self, c):
        if c >= ' ':
            self.fb.text(c, self.x * 8, self.y * self.lineheight, self.fgcolor)
            self.x += 1
            if self.x >= self.w:
                self._newline()

    def write(self, buf):
        self._erase_current()
        i = 0
        while i < len(buf):
            c = buf[i]
            self._putc(HEX[c>>4])
            self._putc(HEX[c&0xf])
            self._putc(' ')
            i += 1
        self._newline()
        try:
            self.fb.show()
        except:
            pass
        return len(buf)

    def readinto(self, buf, nbytes=0):
        if self.readobj != None:
            return self.readobj.readinto(buf, nbytes)
        else:
            return None
        
    def _newline(self):
        self.x = 0
        self.y += 1
        if self.y >= self.h:
            self.fb.scroll(0, -8)
            self.fb.fill_rect(0, self.height - self.lineheight, self.width, self.lineheight, self.bgcolor)
            self.y = self.h - 1

    def _erase_current(self):
        self.fb.fill_rect(self.x * 8, self.y * self.lineheight, 8, self.lineheight, self.bgcolor)