Custom Calypso Board » History » Revision 3
Revision 2 (laforge, 02/19/2016 10:48 PM) → Revision 3/5 (laforge, 02/19/2016 10:49 PM)
h1. = Custom Calypso Board = This wiki page is about creating a custom TI calypso board. The rationale is quite simple: The supply of Motorola/Compal phones is limited, and the quality that's available at this point often is some quite extensively repaired (not just refurbished) phones. As the TI Calypso/Iota/Rita chipset is still available in quantity from the grey market, we can simply build our own board from it. h2. == Existing design == We have an existing Ti Calypso design similar to that used in the Compal/Motorola phones. It does not have an interface for LCM or Keypad. h2. == Intended features == * expose JTAG on a standard header * board-edge connector for plugging many boards into one backplane * external clock input / buffered clock output * RF connector standard u.fl or SMA or optionally separate Rx/Tx on the back-plane * I2C/SPI and both UARTs available on headers * on-board EEPROM for storing persistent data, even beyond NOR flashing * SIM card slot, SIM interface also present on header * additional / unused TPU ports * header for TSP / TPU and all data/control interfaces between iota/rita/calypso * RTC crystal and footprint for backup battery * version of the board with uplink / downlink filters switched
