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AirBrainH743: configure for active buzzer

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We can't use passive buzzers because the timer to drive the PWM would
conflict with the motor outputs M7 and M8.
This commit is contained in:
Julian Oes 2026-01-15 10:51:51 +13:00
parent ea2ca45cf9
commit 7715a4ab4c
2 changed files with 13 additions and 2 deletions
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11
boards/gearup/airbrainh743/src/board_config.h
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@ -112,9 +112,16 @@
#define BOARD_HAS_PWM DIRECT_PWM_OUTPUT_CHANNELS
/* Tone alarm output - PA15 */
/* Tone alarm output (directly connected to transistor switch of external buzzer)
*
* GPIO mode only (active buzzer) - passive buzzer with different tones is not
* supported because PA15 can only use TIM2, which is also used for motor outputs
* M7 (PB10, TIM2_CH3) and M8 (PB11, TIM2_CH4). The PWM tone alarm driver changes
* the timer's prescaler and auto-reload registers (shared across all channels),
* which would affect M7/M8 PWM frequency during tone playback.
*/
#define GPIO_TONE_ALARM_IDLE /* PA15 */ (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN15)
#define GPIO_TONE_ALARM_GPIO /* PA15 */ (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN15)
#define GPIO_TONE_ALARM_GPIO /* PA15 */ (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN15)
/* ICM42688P FSYNC - directly connected to IMU via GPIO (no timer).

4
boards/gearup/airbrainh743/src/timer_config.cpp
View File

@ -45,6 +45,10 @@
* M7: PB10 (TIM2_CH3)
* M8: PB11 (TIM2_CH4)
* M9: PA2 (TIM5_CH3) - LED strip
*
* Note: TIM2 is shared with buzzer pin PA15 (TIM2_CH1). The buzzer is disabled
* by default because the tone alarm driver would change the timer prescaler/ARR
* which affects M7/M8 PWM frequency. See board_config.h for details.
*/
constexpr io_timers_t io_timers[MAX_IO_TIMERS] = {