[paparazzi-commits] [paparazzi/paparazzi] 3250aa: [fix] correct ADC buffer offset for ChibiOS (#2761)

[Gautier Hattenberger]

  Branch: refs/heads/master
  Home:   https://github.com/paparazzi/paparazzi
  Commit: 3250aa8dcd2ccca9b17edcb574a1332b26703dc3
      
https://github.com/paparazzi/paparazzi/commit/3250aa8dcd2ccca9b17edcb574a1332b26703dc3
  Author: Gautier Hattenberger <gautier.hattenberger@enac.fr>
  Date:   2021-08-17 (Tue, 17 Aug 2021)

  Changed paths:
    M sw/airborne/arch/chibios/mcu_periph/adc_arch.c

  Log Message:
  -----------
  [fix] correct ADC buffer offset for ChibiOS (#2761)

- with ChibiOS 20.3 the half buffer starting position is computed by
  hand and was wrong in this case: it should be the product of the half
  buffer size by the number of channels
- some other minor fixes:
  - using && instead of & in boolean comparison
  - suppress a warning (comparison always true/false due to limited data range)
    when the number of channels is zero (no ADC in use)