tree a6586d23a8d5f0fb7b4b873469ff6100decc8431
parent 01bc0b2ff97d40daf325587d07dda5344da7a040
author Chris Frantz <cfrantz@google.com> 1781038615 -0700
committer JesseChambers <145486573+JesseMelon@users.noreply.github.com> 1781105716 -0400

ast10x0/peripherals/smc: Fix panic paths to pass no_panics tests

Eliminate potential panic vectors in the SMC driver and debug utilities
to allow compile-time verification to pass:
- Replaced variable array indexing with match-based helpers for
  `flash_window_base` and `normal_read_ctrl` in `controller.rs`.
- Refactored `spi_read_data` and `spi_write_data` to use safe chunks
  instead of manual slicing/indexing.
- Replaced divisions in `run_timing_sweep` and `spi_freq_div` with a
  lookup table and multiplication, respectively, to avoid division-by-zero
  panic paths.
- Avoided possible underflow in `poll_blocking_dma_completion` by
  checking the timeout before decrementing.
- Simplified `dump_smc_read` in `target_debug.rs` to use `chunks_exact`
  without `unwrap()`.
- Avoided overflow panics in `dump_smc_register` and `get_mid_point_of_longest_one`.

TAG=agy
CONV=9d66bdb8-5246-47e2-b9b4-6f032c6a9480