Differences

This shows you the differences between two versions of the page.

--- epaper_display [2011/02/21 03:13] – [Video] steve_m
+++ epaper_display [2011/07/27 21:48] (current) – [Video] embed video steve_m
@@ Line 3: / Line 3: @@
 The Motorola F3/MOTOFONE was the first (and still is the only?) mobile phone with an e-paper display. Although this is not a pixel-based display, like found in eBook-readers (e.g. the Amazon Kindle or the B&N nook), it is still quite nice for experimenting with low power microcontroller projects.
-E-paper/bistable displays have the ability to sustain the display content even without the supply of power, so initial idea I had was to build something like a clock, only powering the display when updating it every minute.
+E-paper/bistable displays have the ability to retain the display content even without the supply of power, so the initial idea I had was to build something like a clock, only powering the display when updating it every minute.
 ===== The display=====
@@ Line 16: / Line 16: @@
 \\ By the way, since I mentioned the TI Locosto baseband: Maybe someone wants to reverse-engineer the [[http://bb.osmocom.org/trac/wiki/CalypsoRomloader#secure-RomloaderonCalypsoplus|serial rom-bootloader]] of this ARM7-based processor, so we can drive the display directly from the phone :-P
 ===== Interfacing with the display =====
-Normally, the baseband board and the display/keypad pcb are connected with a 32-pin connector (exact model unknown). Luckily there are pull-up resistors and capacitors for every needed signal, so I decided to solder some wires there, instead of directly to the connector. The schematics of this phone are floating around the web (just search for **f3_schem.rar**).
+Normally, the baseband board and the display/keypad pcb are connected with a 32-pin connector (exact model unknown). Luckily there are pull-up resistors and capacitors for every needed signal, so I decided to solder some wires there, instead of directly to the connector. The schematics of this phone are floating around the web, just search for **f3_schem.rar**.
 |{{:f3_wires_soldered.jpg?350|thin wires soldered to the display pcb}}|{{:f3_display_connector.jpg?436|the connector of the display}}|
@@ Line 54: / Line 54: @@
 |P1.5|SPI clock|16|SPI_CLK|
 |P1.6|SPI MOSI|17|SPI_MOSI|
+Note: even though the MISO signal is connected in the original phone, there's no activity at all, so I left it unconnected. Also, DISPLAY_BUSY0 and 1 seem to be identical.
 {{:msp430_epaper.jpg?300|Launchpad with connected display}}
@@ Line 59: / Line 61: @@
 ===== Video =====
 I've [[http://www.youtube.com/watch?v=HZdV2iKakqA|uploaded a video]], demonstrating the display and Launchpad being used as a low-power clock.
+{{youtube>HZdV2iKakqA}}
 A few notes on the video:
-  * The timer was actually sped up by the factor of 10 for demonstration purposes, so 1 minute on the clock is actually 6 seconds in the video.
+  * The timer has been sped up by the factor of 10 for demonstration purposes, so 1 minute on the clock is actually 6 seconds in the video.
   * Completely powering down the display also has its disadvantages. As you can see, the display needs to be initialized every time you power it up again (thus the flickering), which isn't needed when just disabling the 32KHz clock.
   * The second row (showing 000000) is just a counter, counting the total hours, and is intended for a runtime test with a goldcap or CR2032 battery.