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rework.md

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Rev1

  1. USB + power

    • Glue 2.1x5.5mm barrel jack to underside left
    • Route +5 from barrel to TP2
    • Route GND from barrel to I2S GND

  2. Composite, #1

    • Cut trace from composite pin 1 (shield / GND) to C20
    • Route from composite pin 2 (signal) to C20
    • Add GND from composite pin 1 to VGA shield GND

  3. USER1 conflicts with SPI4_CK/PE2 (which can't be disabled through MX - can it work if disabled by hand?)

    • Cut USER1 trace to PE2
    • Route to TIM3_CH2 / PB5 (MOUSE CLK)

  4. Add 21.47277MHz to TIM1_CH3/PA10 (or TIM1_CH1/PA8 if PA10 not possible) for TMS9918A clock

    • Cut PA10/USART1_RX before R46 and join with USART1_TX

    • Glue part near PA10

    • Route CLK to PA10/pin121

    • Route to PA8 / USART1_CK (on current board)

    • Route GND and +3.3V

    • HAL_TIM_IC_Stop(&htim1, TIM_CHANNEL_1); status = HAL_TIM_IC_Start(&htim1, TIM_CHANNEL_3); to sync to 21.47MHz