Move SPI pins to high-impedance state between operations - #42
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…board Replace the static `Serprog` struct with a trait-based approach where SPI pins are only configured as outputs during actual SPI operations: - Add `SpiDeviceProvider` trait for on-demand SPI device creation - Add `SpiCsGuard` trait for guards that provide SPI+CS access - Add `LedProvider` trait with blanket impl for any `OutputPin` - Replace `Serprog::run_loop()` with free function `run_loop()` - Store SPI frequency and pass to provider on each acquire Pin cleanup on drop: - Embassy SPI/Output do NOT auto-reset pins to input mode - Each platform implements custom guard with explicit pin reset - RP2040: Set funcsel to NULL and reset pad control - STM32: Use Flex drop to set pins to analog mode This prevents the serprog microcontroller from driving the SPI pins when idle, allowing the target mainboard to boot normally with the programmer attached. 🤖 Generated with [eca](https://eca.dev) Co-Authored-By: eca <noreply@eca.dev>
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This change refactors the SPI handling to ensure pins are only configured as outputs during active SPI operations. Between operations, pins are reset to high-impedance (analog/disconnected) state to prevent interference with the target flash chip.
Key changes:
SpiDeviceProviderandSpiCsGuardtraits for on-demand SPI configurationThis ensures the programmer doesn't hold the SPI pins in output state when not actively communicating with the flash chip.