PWM for Bltouch and LEDs on AUX pins? about rumba32 HOT 10 CLOSED

@chrissbarr Do you have any thoughts as to why I'm unable to get a Bltouch working on the Rumba32 board on pins PD15, PD14, PD13, or PD12?

Thank you!

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@chrissbarr , bumping this one again. Would really like to get your insight on wether or not a timer change is needed to enable pwm output on PD15, PD14, PD13, and PD12. I'll also go ahead and post this same question in the stm32duino repo.

Thanks!

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Hi Wes,

Sorry that I haven't replied sooner. Too many notifications on GitHub - I missed your earlier messages. My apologies.

Very happy to hear that you've put together one of these boards and are enjoying it! That's great news. Glad that it is working well for you.

At the moment, I don't believe that PWM_1 or PWM_2 are configured to have PWM enabled in the stm32duino core. The relevant place where the PWM is configured is here:

https://github.com/stm32duino/Arduino_Core_STM32/blob/master/variants/RUMBA32_F446VE/PeripheralPins.c

PWM pins are defined from line 125 onwards:

const PinMap PinMap_PWM[] = {
  {PA_0,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)},  // TIM2_CH1
  //  {PA_0,  TIM5,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 1, 0)},  // TIM5_CH1
  //  {PA_1,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)},  // TIM2_CH2
  {PA_1,  TIM5,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 2, 0)},  // TIM5_CH2
  //  {PA_2,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)},  // TIM2_CH3 - STLink Tx
  //  {PA_2,  TIM5,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 3, 0)},  // TIM5_CH3 - STLink Tx
  //  {PA_2,  TIM9,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 1, 0)},  // TIM9_CH1 - STLink Tx
  //  {PA_3,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 4, 0)},  // TIM2_CH4 - STLink Rx
  //  {PA_3,  TIM5,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 4, 0)},  // TIM5_CH4 - STLink Rx
  //  {PA_3,  TIM9,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 2, 0)},  // TIM9_CH2 - STLink Rx
  {PA_5,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)},  // TIM2_CH1
  //  {PA_5,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 1, 1)},  // TIM8_CH1N
  {PA_6,  TIM13,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM13, 1, 0)},  // TIM13_CH1
  //  {PA_6,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)},  // TIM3_CH1
  {PA_7,  TIM14,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM14, 1, 0)},  // TIM14_CH1
  //  {PA_7,  TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 1)},  // TIM1_CH1N
  //  {PA_7,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)},  // TIM3_CH2
  //  {PA_7,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 1, 1)},  // TIM8_CH1N
  {PA_8,  TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 0)},  // TIM1_CH1
  {PA_9,  TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 0)},  // TIM1_CH2
  {PA_10, TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 0)},  // TIM1_CH3
  {PA_11, TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 4, 0)},  // TIM1_CH4
  {PA_15, TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)},  // TIM2_CH1
  //  {PB_0,  TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 1)},  // TIM1_CH2N
  //  {PB_0,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 3, 0)},  // TIM3_CH3
  {PB_0,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 2, 1)},  // TIM8_CH2N
  //  {PB_1,  TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 1)},  // TIM1_CH3N
  //  {PB_1,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 4, 0)},  // TIM3_CH4
  {PB_1,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 3, 1)},  // TIM8_CH3N
  {PB_2,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 4, 0)},  // TIM2_CH4
  {PB_3,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)},  // TIM2_CH2
  {PB_4,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)},  // TIM3_CH1
  {PB_5,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)},  // TIM3_CH2
  {PB_6,  TIM4,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 1, 0)},  // TIM4_CH1
  {PB_7,  TIM4,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 2, 0)},  // TIM4_CH2
  //  {PB_8,  TIM10,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM10, 1, 0)},  // TIM10_CH1
  //  {PB_8,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)},  // TIM2_CH1
  {PB_8,  TIM4,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 3, 0)},  // TIM4_CH3
  {PB_9,  TIM11,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM11, 1, 0)},  // TIM11_CH1
  //  {PB_9,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)},  // TIM2_CH2
  //  {PB_9,  TIM4,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 4, 0)},  // TIM4_CH4
  {PB_10, TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)},  // TIM2_CH3
  {PB_13, TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 1)},  // TIM1_CH1N
  {PB_14, TIM12,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM12, 1, 0)},  // TIM12_CH1
  //  {PB_14, TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 2, 1)},  // TIM1_CH2N
  //  {PB_14, TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 2, 1)},  // TIM8_CH2N
  {PB_15, TIM12,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM12, 2, 0)},  // TIM12_CH2
  //  {PB_15, TIM1,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 3, 1)},  // TIM1_CH3N
  //  {PB_15, TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 3, 1)},  // TIM8_CH3N
  {PC_6,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 1, 0)},  // TIM3_CH1
  //  {PC_6,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 1, 0)},  // TIM8_CH1
  //  {PC_7,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 2, 0)},  // TIM3_CH2
  {PC_7,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 2, 0)},  // TIM8_CH2
  {PC_8,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 3, 0)},  // TIM3_CH3
  //  {PC_8,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 3, 0)},  // TIM8_CH3
  //  {PC_9,  TIM3,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM3, 4, 0)},  // TIM3_CH4
  {PC_9,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 4, 0)},  // TIM8_CH4
  {NC,    NP,    0}
};

PWM_1 and PWM_2 are PD14 and PD15, but they are not enabled in this configuration - I don't remember if there was a reason for this, but you could try to add them to your install of stm32duino here and see if that works. You may need to check the F446 datasheet to try and match the timers and GPIO alternate-function config as above - I can look into this sometime if you'd like, just let me know.

An easier option, looking at the pins that are configured for PWM, might be to use PA9 and PA10 - these map to USART1_TX and USART1_RX, both of which are on EXP3 (where you were trying to use PWM_1 and PWM_2). Assuming you're not using USART1, you should only need to change your Marlin configuration to use PA9 or PA10 for the BLTouch PWM pins.

I don't have a BLTouch on hand to test with, but my understanding is that they can sometimes be finicky even on 'regular' 8-bit boards - at least, there always seem to be people asking for help configuring them with Marlin. I'm not sure how dependent they are on the PWM frequency or how the stm32duino PWM frequency compares to the Arduino default (or whether Marlin uses some servo library to set a specific frequency). These are things that could potentially be sources of trouble. However, the first step would be to get some measurable PWM output on a pin you can use, and then if the probe still doesn't work we could narrow it down from there.

Hope that helps! If you're still stuck, let me know and we'll try and figure this out.

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Thanks for the reply. No need to apologize, I assumed you were busy.

Thanks for confirming that not having these pins set up for PWM in PeripheralPins.c is the cause of the behavior I'm seeing. I tried enabling them, to no avail, but I think I may have caused a timer conflict in doing so. I noticed that in order to get add the pins I wanted, I was likely going to have to redefine a chain of other pins to ensure no sharing of timers.

I agree that the bltouch seems to be finicky and that getting Marlin to simply output a PWM signal when issuing a bltouch command is my next step. Fortunately, I'm not using the serial pins on exp3, so that's where I'll go next. Once I get that working, I'll figure out how to correctly set up the other pins in PeripheralPins.c.

Lastly, can you tell me where you're actually mapping the pin names (like PD_0, PC_5, etc...) to the physical pin numbers on the processor? I thought that would be done in variant.h, but it's not. I recall some code elsewhere that looked like it was doing the conversion, but I'm not sure. Specifically, where does PD_15 get mapped to physical pin 62?

Thanks again for your help! I was going nuts trying to get my DUE+RADDS board to perform well and work reliably, so I finally decided to scrap that and find a better 32bit board. You designed the perfect solution IMO, and I think it should become the new 'standard' for 3D printer controllers.

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No worries, happy to help.

The pin mapping is done in the variant.cpp file, starting from about line 25, here:

https://github.com/stm32duino/Arduino_Core_STM32/blob/master/variants/RUMBA32_F446VE/variant.cpp

It's not immediately obvious that that's what you're after, because the way the pins are defined in stm32duino you don't actually see the pin numbers. The pin numbers are implicit in the list - so the first pin is D0, the second is D1, and so on.

The numbering is somewhat arbitrary, and there's no correlation between the numbers assigned to the pins and their actual physical numbering - I simply chose to go from PA_0 in order. This may be something that's tripped you up - to my knowledge, the physical pin numbers are not used anywhere in the stm32duino core (or at least, not for this board). You can use either the port/pin definitions (i.e. PA0, PD15, etc), or the number mapped in the above file - which for PD15 is 63.

It would be nice to have the stm32duino pin numbers correspond to the physical package numbers, but I'm not sure if this is doable - specifically, I'm not sure if it's possible to have gaps in the pin numbers, as would be needed to allow for power and other non-gpio pins.

Hope that helps! Let me know if you need any more info.

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Hi @WK-MS did you get bltouch working on the rumba32? I'm having same issue

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Hi @chrissbarr - could you please have a look at this? I've spent about 2 weeks trying literally everything.... I looked at the data sheet, pin PD15 is alt fn of TIM4, I created that in peripheralpins
{PD_15, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 1, 0)},
And tried, well basically everything, even stuff that didn't make sense.
The rumba32 is a great board, but extra PWM functionality is a necessity, and at the moment non functioning....

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... 2 weeks, I post, and then 1 hour later, get it working...

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In

C:\Users\xxx\AppData\Local\Arduino15\packages\STM32\hardware\stm32\1.7.0\variants\RUMBA32_F446VE

change
#define TIMER_SERVO TIM7
to
#define TIMER_SERVO TIM4
(reason: PD15 which is PWM2 is connected to TIM4 as per stm32f446 datasheet)

In:

C:\Users\xxxxx\AppData\Local\Arduino15\packages\STM32\hardware\stm32\1.7.0\variants\RUMBA32_F446VE\PeripheralPins.c

change:
// {PB_9, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 4, 0)}, // TIM4_CH4
to:
{PD_15, TIM4, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM4, 4, 0)}, // TIM4_CH4

In Marlin in:

..\Marlin-2.0.x\Marlin\src\pins\stm32\pins_RUMBA32.h

add
#define SERVO0_PIN PD15

That's it... that's all you need to do, and PWM works on PD15, and hence bltouch works fine

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