Improve the VREF calibration routine #132

atse · 2024-09-16T18:17:38+08:00

atse commented

2024-09-16 18:17:38 +08:00

VREF was incorrectly calibrated on a new v2.2.2 board, which calibrates its zero current point to be 2.2V instead of 1.5V

This PR implements a fix to the calibration problem. The fix is similar to Kirdy and calibrates VREF consistently in constant time.
This can also prevent boot-looping.

Reference from Kirdy's calibration sequence at a512614de5/src/thermostat/thermostat.rs (L317-L344).

VREF was incorrectly calibrated on a new v2.2.2 board, which calibrates its zero current point to be 2.2V instead of 1.5V This PR implements a fix to the calibration problem. The fix is similar to Kirdy and calibrates VREF consistently in constant time. This can also prevent boot-looping. Reference from Kirdy's calibration sequence at https://git.m-labs.hk/M-Labs/kirdy/src/commit/a512614de535a6fb934ab848a1adc7b714f52eae/src/thermostat/thermostat.rs#L317-L344.

atse added 1 commit 2024-09-16 18:17:38 +08:00

1041d3ecbb Improve the VREF calibration routine

* Fix wrong calibration of VREF on startup. Caused new v2.2.2 boards to
wrongly calibrate the zero-point to ~2.2 V instead of 1.5 V.

* Fix bootloop on some boards.

* Adjust watchdog interval accordingly.

mwojcik reviewed 2024-09-16 19:18:57 +08:00

src/main.rs

						
				@ -59,3 +59,3 @@

				const HSE: MegaHertz = MegaHertz(8);

				#[cfg(not(feature = "semihosting"))]

				const WATCHDOG_INTERVAL: u32 = 1_000;

				const WATCHDOG_INTERVAL: u32 = 2_000;