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Increase PWM output range to 0-255

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For #358
Also fixes #394
This commit is contained in:
Ben V. Brown
2018-10-29 20:55:40 +11:00
parent 81e87c86d0
commit 02bdf450b2
7 changed files with 741 additions and 721 deletions
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11
workspace/TS100/src/Setup.c
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@@ -308,9 +308,12 @@ static void MX_TIM2_Init(void) {
// in the PWM off time.
htim2.Instance = TIM2;
htim2.Init.Prescaler =
2000; // pwm out is 10k, we want to run our PWM at around 100hz
785; // pwm out is 10k from tim3, we want to run our PWM at around 10hz or slower on the output stage
// The input is 1mhz after the div/4, so divide this by 785 to give around 4Hz output change rate
//Trade off is the slower the PWM output the slower we can respond and we gain temperature accuracy in settling time,
//But it increases the time delay between the heat cycle and the measurement and calculate cycle
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 122;
htim2.Init.Period = 255+56;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV4; // 4mhz before divide
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
HAL_TIM_Base_Init(&htim2);
@@ -326,11 +329,11 @@ static void MX_TIM2_Init(void) {
HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 118;
sConfigOC.Pulse = 255+47; //255 is the largest time period of the drive signal, and the 47 offsets this around 5ms afterwards
/*
* It takes 4 milliseconds for output to be stable after PWM turns off.
* Assume ADC samples in 0.5ms
* We need to set this to 100% + 5.5ms
* We need to set this to 100% + 4.5ms
* */
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_ENABLE;