1 ==============================================
2 spi_butterfly - parport-to-butterfly adapter d
3 ==============================================
4
5 This is a hardware and software project that i
6 a parallel port adapter cable, together with a
7 firmware for user interfacing and/or sensors.
8 battery powered card with an AVR microcontroll
9 sensors, LCD, flash, toggle stick, and more.
10 develop firmware for this, and flash it using
11
12 You can make this adapter from an old printer
13 directly to the Butterfly. Or (if you have th
14 can come up with something fancier, providing
15 Butterfly and the printer port, or with a bett
16 signal pins from the printer port. Or for tha
17 similar cables to talk to many AVR boards, eve
18
19 This is more powerful than "ISP programming" c
20 SPI protocol drivers interact with the AVR, an
21 issue interrupts to them. Later, your protoco
22 easily with a "real SPI controller", instead o
23
24
25 The first cable connections will hook Linux up
26 AVR and a DataFlash chip; and to the AVR reset
27 need to reflash the firmware, and the pins are
28 connector pins (used also on non-Butterfly AVR
29 side this is like "sp12" programming cables.
30
31 ====== ============= ============
32 Signal Butterfly Parport (DB-
33 ====== ============= ============
34 SCK J403.PB1/SCK pin 2/D0
35 RESET J403.nRST pin 3/D1
36 VCC J403.VCC_EXT pin 8/D6
37 MOSI J403.PB2/MOSI pin 9/D7
38 MISO J403.PB3/MISO pin 11/S7,nB
39 GND J403.GND pin 23/GND
40 ====== ============= ============
41
42 Then to let Linux master that bus to talk to t
43 (a) flash new firmware that disables SPI (set
44 by clearing PORTB.[0-3]); (b) configure the mt
45 (c) cable in the chipselect.
46
47 ====== ============ ============
48 Signal Butterfly Parport (DB-
49 ====== ============ ============
50 VCC J400.VCC_EXT pin 7/D5
51 SELECT J400.PB0/nSS pin 17/C3,nS
52 GND J400.GND pin 24/GND
53 ====== ============ ============
54
55 Or you could flash firmware making the AVR int
56 DataFlash in reset) and tweak the spi_butterfl
57 the driver for your custom SPI-based protocol.
58
59 The "USI" controller, using J405, can also be
60 That would let you talk to the AVR using custo
61 while letting either Linux or the AVR use the
62 of spare parport pins to wire this one up, suc
63
64 ====== ============= ============
65 Signal Butterfly Parport (DB-
66 ====== ============= ============
67 SCK J403.PE4/USCK pin 5/D3
68 MOSI J403.PE5/DI pin 6/D4
69 MISO J403.PE6/DO pin 12/S5,nP
70 GND J403.GND pin 22/GND
71
72 IRQ J402.PF4 pin 10/S6,AC
73 GND J402.GND(P2) pin 25/GND
74 ====== ============= ============
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.