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Fix overflow in STM32 dead-time calculation #265

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Merged
merged 2 commits into from
Mar 30, 2023
Merged

Fix overflow in STM32 dead-time calculation #265

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fddf80c
add overflow check to STM32 HW dead-time calc
Mar 30, 2023
5e274ad
add check for dead-time overflow on STM32
Mar 30, 2023
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5 changes: 5 additions & 0 deletions src/drivers/hardware_specific/stm32/stm32_mcu.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -287,6 +287,11 @@ STM32DriverParams* _initHardware6PWMPair(long PWM_freq, float dead_zone, PinMap*
// dead time is set in nanoseconds
uint32_t dead_time_ns = (float)(1e9f/PWM_freq)*dead_zone;
uint32_t dead_time = __LL_TIM_CALC_DEADTIME(SystemCoreClock, LL_TIM_GetClockDivision(HT->getHandle()->Instance), dead_time_ns);
if (dead_time>255) dead_time = 255;
if (dead_time==0 && dead_zone>0) {
dead_time = 255; // LL_TIM_CALC_DEADTIME returns 0 if dead_time_ns is too large
SIMPLEFOC_DEBUG("STM32-DRV: WARN: dead time too large, setting to max");
}
LL_TIM_OC_SetDeadTime(HT->getHandle()->Instance, dead_time); // deadtime is non linear!
#if SIMPLEFOC_PWM_HIGHSIDE_ACTIVE_HIGH==false
LL_TIM_OC_SetPolarity(HT->getHandle()->Instance, getLLChannel(pinH), LL_TIM_OCPOLARITY_LOW);
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