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Software AreasOfWork » History » Version 9

steve-m, 02/19/2016 10:49 PM
update JTAG status

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= Areas of Work =
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This page lists the various areas of the project that require some work, and who (if at all) is
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working on fixing it.
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== Infrastructure ==
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=== Build System ===
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 * we need a clean/known base as a compiler
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  * At the moment, we're mostly using the 4.0.2 release from gnuarm.com, which is fairly old
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 * independence of system-provided header files 
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  * We should be mostly there now.  But testing this and verifying our independence of system headers would be great
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=== Operating System ===
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 * Decide which RTOS to use on the Calypso
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  * we don't want to use FreeRTOS
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  * OS should have clear abstraction of core (ARM7TDM), SoC and board level features
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  * OS should cleanly compile to a library that we can link with all our other code
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  * While we only work on the GSM stack, no OS is needed. But as soon as UI comes around, that changes.
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=== Development Tools ===
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 * try to make JTAG (C155) work with OpenOCD
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  * steve-m made some experiments, but halting the ARM core only seems to be possible via the undocumented ICEPick unit
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  * works now, required sniffing the TI CCS debugger, [wiki:'Hardware/Calypso#JTAGInterface' see here].
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== Host Software ==
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 * osmocon support for the native ROM loader in the Calypso, the [wiki:Hardware/CalypsoRomloader], like it is found on most non-Compal phones
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  * "non-secure" variant (done, steve-m)
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  * "secure variant" on Calypso/Calypso plus (basic reverse engineering done)
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== Target Software ==
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=== Drivers ===
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 * charger detection, battery charging (roh)
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 * SIM card reader (dexter)
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 * Color display driver for C155 (done, steve-m)
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 * backlight driver
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 * vibrator driver
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 * buzzer driver for C123
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 * C155 ringtone chip driver for SPMA100 chip
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 * Fix the I2C driver to use the b/w LCD without any sleep/delay loops
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  * done (sigwinch)
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=== GSM Stuff ===
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 * TRF6151, TPU, TSP, AGC, AFC (laforge)
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 * Layer1, particularly the synchronous part (laforge, spaar)
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 * Layer2 (zecke, laforge)
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 * Layer3 (eversberg)
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 * Playing with the Voice part using the dsp misc task (spaar?)
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=== General Infrastructure ===
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 * Flash-based log-structured filesystem (prom)
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=== Bootloader ===
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 * Put together a bootloader (prom)
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 * Define linkage situations (prom)
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=== UI related ===
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 * proportional fonts in at least two sizes, as small as possible
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  * monospaced fonts waste too much scarce screen real estate
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 * cache the frame buffer in RAM and sync when needed
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  * once we have a scheduler and tasks, run screen refresh as low-priority task
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 * hardware independent API to support C123, C155 (and later other) displays
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  * software should not care if it is using color or b/w display
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 * some kind of fixed screen layout masks, where
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  * a data structure defines a screen mask
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  * the application can easily update the content without having to deal with formatting/positioning
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 * UI widgets like
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  * lists that can be scrolled through
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  * menus build of a tree of such lists
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