epaper_display
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epaper_display [2011/02/21 21:44] steve_m [Driving the Motorola F3 e-paper display] |
epaper_display [2011/02/24 17:19] steve_m [Microcontroller] |
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| 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. | 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 the 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===== | ===== The display===== | ||
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| \\ 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 | \\ 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 ===== | ===== 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}}| | |{{:f3_wires_soldered.jpg?350|thin wires soldered to the display pcb}}|{{:f3_display_connector.jpg?436|the connector of the display}}| | ||
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| |P1.5|SPI clock|16|SPI_CLK| | |P1.5|SPI clock|16|SPI_CLK| | ||
| |P1.6|SPI MOSI|17|SPI_MOSI| | |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}} | {{:msp430_epaper.jpg?300|Launchpad with connected display}} | ||
epaper_display.txt ยท Last modified: 2011/07/27 23:48 by steve_m
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