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Sequre Faster PWM (#1926)

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* 4x faster PWM

* Add light filter to displayed temp
This commit is contained in:
Ben V. Brown
2024-06-08 17:34:20 +10:00
committed by GitHub
parent 14b92cde08
commit e925037988
3 changed files with 11 additions and 12 deletions
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15
source/Core/BSP/Sequre_S60/Setup.cpp
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@@ -57,7 +57,7 @@ void Setup_HAL() {
GPIO_InitStruct.Pin = MOVEMENT_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLDOWN;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; // We would like sharp rising edges
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(MOVEMENT_GPIO_Port, &GPIO_InitStruct);
}
}
@@ -254,23 +254,20 @@ static void MX_IWDG_Init(void) {
static void MX_TIM4_Init(void) {
/*
* We use the channel 1 to trigger the ADC at end of PWM period
* And we use the channel 4 as the PWM modulation source using Interrupts
* On Sequre devies we run the output PWM as fast as possible due to the low tip resistance + no inductor for filtering.
* So we run it as fast as we can and hope that the caps filter out the current spikes.
* */
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
memset(&sConfigOC, 0, sizeof(sConfigOC));
// Timer 2 is fairly slow as its being used to run the PWM and trigger the ADC
// in the PWM off time.
htim4.Instance = TIM4;
// dummy value, will be reconfigured by BSPInit()
htim4.Init.Prescaler = 10; // 2 MHz timer clock/1000 = 2 kHz tick rate
htim4.Init.Prescaler = 10; // 2 MHz timer clock/10 = 200 kHz tick rate
// pwm out is 10k from tim3, we want to run our PWM at around 10hz or slower on the output stage
// These values give a rate of around 3.5 Hz for "fast" mode and 1.84 Hz for "slow"
htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
htim4.Init.Period = 255;
htim4.Init.Period = 64;
htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; // 8 MHz (x2 APB1) before divide
htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;