tech page

a mp3redux prototype (of three) is used for driver development ...
the mp3redux design features on a pc/104 board:

• a mp3-player based on a ST STA013 hardware decoder
• a lcd-module interface (the same as in plcdio)
• a source-selektor/sound-controller TEA6320,
  sources: onboard (mp3/radio1/radio2) external (line/mono)
• a i2c-controller pcf8584
• a lm75 thermal watchdog
• two connectors for (modified) radio modules with rds
  (using terratec activeradio upgrades)
• expansion connector for i2c and IR

technical specs:

• pc/104 board (90x96mm, isa bus)
• glue logic in a lattice isplsi2032 and some HCT/LVX ttl-chips
• dma-transfer to sta013 (to lower cpu-usage)
• onboard hardware i2c-controller (to lower cpu-usage)
• same lcd-connector as plcdio
• using modified activeradio upgrades: routing i2c from rds-decoder to connector,
  attached tea5757s directly to a pcf8574

up next (see log-file):
high-prio:

• get tmc-decoder usable
• get apps usable
• build cases ( single and double-height car slot)

• improve cajun and irmp3 setups, create demo system
• rethink start/stop for sta013, control by data, not by i2c
• add ioctl to access sta-registers, maybe remove convenience functions like play, stop, vol ...
• finalize isplsi programming
• improve mixer-driver ( add balance, add fader)
• improve lirc-driver (integrate in lirc package)

issues resolved:

• lcd-controller working
• lcd bias-voltage generator working
• elan stuff resolved, playing mp3. a race in the statemachine caused missing bits
• the pullups on my open-drain "level-shifter" were too weak, replaced hct03 with lvx00, perfect level-shift, small modifications to board
• added state-machine for pcf8584, can go 400ns isa-timing with elan-board
• old: rewire tea6320 hardware mute, de-couple tea inputs
• cosmetic: wire dmareq to be readable via irq_source register (needed for polling)
• add irq selector for pcf8584. irq9 on elan, irq15 on zfx86.