• Audio Interface

    dreamldx • 5 days ago • 0 comments

    Signal Chain: STM32 I2S2 -> PCM1755 -> LMV324 *3 (Bass/Treble Control) -> TPA2005D

    Pinout:

    PCM1754_SCK_GPIO        GPIOC
PCM1754_SCK_GPIO_PIN    6
PCM1754_DATA_GPIO       GPIOB
PCM1754_DATA_GPIO_PIN   15
PCM1754_BCK_GPIO        GPIOB
PCM1754_BCK_GPIO_PIN    13
PCM1754_LRCK_GPIO       GPIOB
PCM1754_LRCK_GPIO_PIN   12
PCM1754_MUTE_GPIO       GPIOC
PCM1754_MUTE_GPIO_PIN   7

TPA2005D_SHUTDOWN_GPIO       GPIOC
TPA2005D_SHUTDOWN_GPIO_PIN   11

  • Add Debug LED

    dreamldx • 11/29/2024 at 05:59 • 0 comments

    Install the debug LED18 near the microprocessor. The LED is coneccted  to IO PB0.

  • ​Add debug port in CN4

    dreamldx • 11/29/2024 at 05:52 • 0 comments

    The system has a power management unit which will malfunction durine the debug, so the microprocessor need extra power supply.

    • Red: Power Supply +3.3V
    • Yellow: SWD_IO
    • Green: SWD_CLK
    • White: SWD_SWO
    • Black: GND