Custom Calypso Board » History » Version 2
laforge, 02/19/2016 10:48 PM
1 | 2 | laforge | = Custom Calypso Board = |
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2 | 1 | laforge | |
3 | This wiki page is about creating a custom TI calypso board. |
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5 | The rationale is quite simple: The supply of Motorola/Compal phones is limited, and the quality that's available |
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6 | at this point often is some quite extensively repaired (not just refurbished) phones. |
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8 | As the TI Calypso/Iota/Rita chipset is still available in quantity from the grey market, we can simply build our |
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9 | own board from it. |
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11 | == Existing design == |
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13 | We have an existing Ti Calypso design similar to that used in the Compal/Motorola phones. |
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15 | It does not have an interface for LCM or Keypad. |
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17 | == Intended features == |
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19 | * expose JTAG on a standard header |
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20 | * board-edge connector for plugging many boards into one backplane |
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21 | * external clock input / buffered clock output |
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22 | * RF connector standard u.fl or SMA or optionally separate Rx/Tx on the back-plane |
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23 | * I2C/SPI and both UARTs available on headers |
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24 | * on-board EEPROM for storing persistent data, even beyond NOR flashing |
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25 | * SIM card slot, SIM interface also present on header |
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26 | * additional / unused TPU ports |
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27 | * header for TSP / TPU and all data/control interfaces between iota/rita/calypso |
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28 | * RTC crystal and footprint for backup battery |
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29 | 2 | laforge | * version of the board with uplink / downlink filters switched |